feat: add first draft of DoS avoiding log

The concept is simple: Log messages are only emitted if the current log
level allows for it __and__ if the log message was caused by a trusted
party. The less trusted a party is, the less likely it is to cause
log messages. For example, error messages about broken input received
from an untrusted party are to be silently ignored, as to not allow
**anyone** to cause massive amounts of log messages.

.ci/gen-workflow-files.nu

@@ -0,0 +1,200 @@
+#!/usr/bin/env nu
+
+use log *
+
+# cd to git root
+cd (git rev-parse --show-toplevel)
+
+# check if a subject depends on a potential dependency
+def depends [
+    subject:string # package to examine
+    maybe_dep:string # maybe a dependency of subject
+  ] {
+  not ( nix why-depends --quiet --derivation $subject $maybe_dep | is-empty ) 
+}
+
+# get attribute names of the attribute set
+def get-attr-names [
+    expr: # nix expression to get attrNames of 
+  ] {
+  nix eval --json $expr --apply builtins.attrNames | from json
+}
+
+def job-id [
+  system:string,
+  derivation:string,
+  ] {
+  $"($system)---($derivation)"
+}
+
+# map from nixos system to github runner type
+let systems_map = {
+  # aarch64-darwin
+  # aarch64-linux
+  
+  i686-linux: ubuntu-latest,
+  x86_64-darwin: macos-13,
+  x86_64-linux: ubuntu-latest
+}
+
+let targets = (get-attr-names ".#packages"
+  | par-each {|system| { $system : (get-attr-names $".#packages.($system)") } }
+  | reduce {|it, acc| $acc | merge $it }
+)
+
+mut cachix_workflow = {
+  name: "Nix",
+  permissions: {contents: write},
+  on: {
+    pull_request: null,
+    push: {branches: [main]}
+  },
+  jobs: {},
+}
+
+mut release_workflow = {
+  name: "Release",
+  permissions: {contents: write},
+  on: { push: {tags: ["v*"]} },
+  jobs: {},
+}
+
+let runner_setup = [
+  {
+    uses: "actions/checkout@v3"
+  }
+  {
+    uses: "cachix/install-nix-action@v22",
+    with: { nix_path: "nixpkgs=channel:nixos-unstable" }
+  }
+  {
+    uses: "cachix/cachix-action@v12",
+    with: {
+      name: rosenpass,
+      authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+    }
+  }
+]
+
+for system in ($targets | columns) {
+  if ($systems_map | get -i $system | is-empty) {
+    log info $"skipping ($system), since there are no GH-Actions runners for it"
+    continue
+  }
+
+  # lookup the correct runner for $system
+  let runs_on = [ ($systems_map | get $system) ]
+
+  # add jobs for all derivations
+  let derivations = ($targets | get $system)
+  for derivation in $derivations {
+
+    if ($system == "i686-linux") and ($derivation | str contains "static") {
+      log info $"skipping ($system).($derivation), due to liboqs 0.8 not present in oqs-sys"
+      continue
+    }
+
+    if ($system == "i686-linux") and ($derivation | str contains "release-package") {
+      log info $"skipping ($system).($derivation), due to liboqs 0.8 not present in oqs-sys"
+      continue
+    }
+
+    # job_id for GH-Actions
+    let id = ( job-id $system $derivation )
+
+    # name displayed
+    let name = $"($system).($derivation)"
+
+    # collection of dependencies
+    # TODO currently only considers dependencies on the same $system
+    let needs = ($derivations
+      | filter {|it| $it != $derivation and $it != "default" } # filter out self and default
+      | par-each {|it| {
+        name: $it, # the other derivation
+        # does self depend on $it?
+        needed: (depends $".#packages.($system).($derivation)" $".#packages.($system).($it)")
+      } }
+      | filter {|it| $it.needed}
+      | each {|it| job-id $system $it.name}
+    )
+
+    mut new_job = {
+      name: $"Build ($name)",
+      "runs-on": $runs_on,
+      needs: $needs,
+      steps: ($runner_setup | append [
+        {
+          name: Build,
+          run: $"nix build .#packages.($system).($derivation) --print-build-logs"
+        }
+      ])
+    }
+    $cachix_workflow.jobs = ($cachix_workflow.jobs | insert $id $new_job )
+  }
+
+  # add check job
+  $cachix_workflow.jobs = ($cachix_workflow.jobs | insert $"($system)---check" {
+    name: $"Run Nix checks on ($system)",
+    "runs-on": $runs_on,
+    steps: ($runner_setup | append {
+      name: Check,
+      run: "nix flake check . --print-build-logs"
+    })
+  })
+
+  # add release job
+  $release_workflow.jobs = ($release_workflow.jobs | insert $"($system)---release" {
+    name: $"Build release artifacts for ($system)",
+    "runs-on": $runs_on,
+    steps: ($runner_setup | append [
+      {
+        name: "Build release",
+        run: "nix build .#release-package --print-build-logs"
+      }
+      {
+        name: Release,
+        uses: "softprops/action-gh-release@v1",
+        with: {
+          draft: "${{ contains(github.ref_name, 'rc') }}",
+          prerelease: "${{ contains(github.ref_name, 'alpha') || contains(github.ref_name, 'beta') }}",
+          files: "result/*"
+        }
+      }
+    ])
+  })
+}
+
+# add whitepaper job with upload
+let system = "x86_64-linux"
+$cachix_workflow.jobs = ($cachix_workflow.jobs | insert $"($system)---whitepaper-upload" {
+  name: $"Upload whitepaper ($system)",
+  "runs-on": ($systems_map | get $system),
+  "if": "${{ github.ref == 'refs/heads/main' }}",
+  steps: ($runner_setup | append [
+    {
+      name: "Git add git sha and commit",
+      run: "cd papers && ./tex/gitinfo2.sh && git add gitHeadInfo.gin"
+    }
+    {
+      name: Build,
+      run: $"nix build .#packages.($system).whitepaper --print-build-logs"
+    }
+    {
+      name: "Deploy PDF artifacts",
+      uses: "peaceiris/actions-gh-pages@v3",
+      with: {
+        github_token: "${{ secrets.GITHUB_TOKEN }}",
+        publish_dir: result/,
+        publish_branch: papers-pdf,
+        force_orphan: true
+      }
+    }
+  ])
+})
+
+log info "saving nix-cachix workflow"
+$cachix_workflow | to yaml | save --force .github/workflows/nix.yaml
+$release_workflow | to yaml | save --force .github/workflows/release.yaml
+
+log info "prettify generated yaml"
+prettier -w .github/workflows/

.github/workflows/doc-upload.yml

@@ -0,0 +1,49 @@
+name: Update website docs
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "doc/**"
+
+jobs:
+  update-website:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Clone rosenpass-website repository
+        uses: actions/checkout@v3
+        with:
+          repository: rosenpass/rosenpass-website
+          ref: main
+          path: rosenpass-website
+          token: ${{ secrets.PRIVACC }}
+
+      - name: Copy docs to website repo
+        run: |
+          cp -R doc/* rosenpass-website/static/docs/
+
+      - name: Install mandoc
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y mandoc
+
+      - name: Compile man pages to HTML
+        run: |
+          cd rosenpass-website/static/docs/
+          for file in *.1; do
+            mandoc -Thtml "$file" > "${file%.*}.html"
+          done
+
+      - name: Commit changes to website repo
+        uses: EndBug/add-and-commit@v9
+        with:
+          author_name: GitHub Actions
+          author_email: actions@github.com
+          message: Update docs
+          cwd: rosenpass-website/static/docs
+          github_token: ${{ secrets.PRIVACC }

.github/workflows/nix.yaml

@@ -1,74 +1,346 @@
-name: Nix Related Actions
+name: Nix
 permissions:
   contents: write
 on:
-  pull_request:
+  pull_request: null
   push:
-    branches: [main]
-
+    branches:
+      - main
 jobs:
-  build:
-    name: Build ${{ matrix.derivation }} on ${{ matrix.nix-system }}
+  i686-linux---default:
+    name: Build i686-linux.default
     runs-on:
-      - nix
-      - ${{ matrix.nix-system }}
-    strategy:
-      fail-fast: false
-      matrix:
-        nix-system:
-          - x86_64-linux
-          # - aarch64-linux
-        derivation:
-          - rosenpass
-          - rosenpass-static
-          - rosenpass-oci-image
-          - rosenpass-static-oci-image
-          - proof-proverif
-          - whitepaper
-
+      - ubuntu-latest
+    needs:
+      - i686-linux---rosenpass
     steps:
       - uses: actions/checkout@v3
-      - name: Generate gitHeadInfo.gin for the whitepaper
-        if: ${{ matrix.derivation == 'whitepaper' }}
-        run: ( cd papers && ./tex/gitinfo2.sh && git add gitHeadInfo.gin )
-      - name: Build ${{ matrix.derivation }}@${{ matrix.nix-system }}
-        run: |
-          # build the package
-          nix build .#packages.${{ matrix.nix-system }}.${{ matrix.derivation }} --print-build-logs
-
-          # copy over the results
-          if [[ -f $(readlink --canonicalize result ) ]]; then
-            mkdir -- ${{ matrix.derivation }}-${{ matrix.nix-system }}
-          fi
-          cp --recursive -- $(readlink --canonicalize result) ${{ matrix.derivation }}-${{ matrix.nix-system }}
-          chmod --recursive ug+rw -- ${{ matrix.derivation }}-${{ matrix.nix-system }}
-
-          # add version information
-          git rev-parse --abbrev-ref HEAD > ${{ matrix.derivation }}-${{ matrix.nix-system }}/git-version
-          git rev-parse HEAD > ${{ matrix.derivation }}-${{ matrix.nix-system }}/git-sha
-
-          # override the `rp` script to keep compatible with non-nix systems
-          if [[ -f ${{ matrix.derivation }}-${{ matrix.nix-system }}/bin/rp ]]; then
-            cp --force -- rp ${{ matrix.derivation }}-${{ matrix.nix-system }}/bin/
-          fi
-      - name: Upload build results
-        uses: actions/upload-artifact@v3
+      - uses: cachix/install-nix-action@v22
         with:
-          name: ${{ matrix.derivation }}-${{ matrix.nix-system }}
-          path: ${{ matrix.derivation }}-${{ matrix.nix-system }}
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.i686-linux.default --print-build-logs
+  i686-linux---rosenpass:
+    name: Build i686-linux.rosenpass
+    runs-on:
+      - ubuntu-latest
+    needs: []
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.i686-linux.rosenpass --print-build-logs
+  i686-linux---rosenpass-oci-image:
+    name: Build i686-linux.rosenpass-oci-image
+    runs-on:
+      - ubuntu-latest
+    needs:
+      - i686-linux---rosenpass
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.i686-linux.rosenpass-oci-image --print-build-logs
+  i686-linux---check:
+    name: Run Nix checks on i686-linux
+    runs-on:
+      - ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Check
+        run: nix flake check . --print-build-logs
+  x86_64-darwin---default:
+    name: Build x86_64-darwin.default
+    runs-on:
+      - macos-13
+    needs:
+      - x86_64-darwin---rosenpass
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-darwin.default --print-build-logs
+  x86_64-darwin---release-package:
+    name: Build x86_64-darwin.release-package
+    runs-on:
+      - macos-13
+    needs:
+      - x86_64-darwin---rosenpass
+      - x86_64-darwin---rosenpass-oci-image
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-darwin.release-package --print-build-logs
+  x86_64-darwin---rosenpass:
+    name: Build x86_64-darwin.rosenpass
+    runs-on:
+      - macos-13
+    needs: []
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-darwin.rosenpass --print-build-logs
+  x86_64-darwin---rosenpass-oci-image:
+    name: Build x86_64-darwin.rosenpass-oci-image
+    runs-on:
+      - macos-13
+    needs:
+      - x86_64-darwin---rosenpass
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-darwin.rosenpass-oci-image --print-build-logs
+  x86_64-darwin---check:
+    name: Run Nix checks on x86_64-darwin
+    runs-on:
+      - macos-13
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Check
+        run: nix flake check . --print-build-logs
+  x86_64-linux---default:
+    name: Build x86_64-linux.default
+    runs-on:
+      - ubuntu-latest
+    needs:
+      - x86_64-linux---rosenpass
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.default --print-build-logs
+  x86_64-linux---proof-proverif:
+    name: Build x86_64-linux.proof-proverif
+    runs-on:
+      - ubuntu-latest
+    needs:
+      - x86_64-linux---proverif-patched
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.proof-proverif --print-build-logs
+  x86_64-linux---proverif-patched:
+    name: Build x86_64-linux.proverif-patched
+    runs-on:
+      - ubuntu-latest
+    needs: []
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.proverif-patched --print-build-logs
+  x86_64-linux---release-package:
+    name: Build x86_64-linux.release-package
+    runs-on:
+      - ubuntu-latest
+    needs:
+      - x86_64-linux---rosenpass-static-oci-image
+      - x86_64-linux---rosenpass-static
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.release-package --print-build-logs
+  x86_64-linux---rosenpass:
+    name: Build x86_64-linux.rosenpass
+    runs-on:
+      - ubuntu-latest
+    needs: []
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.rosenpass --print-build-logs
+  x86_64-linux---rosenpass-oci-image:
+    name: Build x86_64-linux.rosenpass-oci-image
+    runs-on:
+      - ubuntu-latest
+    needs:
+      - x86_64-linux---rosenpass
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.rosenpass-oci-image --print-build-logs
+  x86_64-linux---rosenpass-static:
+    name: Build x86_64-linux.rosenpass-static
+    runs-on:
+      - ubuntu-latest
+    needs: []
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.rosenpass-static --print-build-logs
+  x86_64-linux---rosenpass-static-oci-image:
+    name: Build x86_64-linux.rosenpass-static-oci-image
+    runs-on:
+      - ubuntu-latest
+    needs:
+      - x86_64-linux---rosenpass-static
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.rosenpass-static-oci-image --print-build-logs
+  x86_64-linux---whitepaper:
+    name: Build x86_64-linux.whitepaper
+    runs-on:
+      - ubuntu-latest
+    needs: []
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build
+        run: nix build .#packages.x86_64-linux.whitepaper --print-build-logs
+  x86_64-linux---check:
+    name: Run Nix checks on x86_64-linux
+    runs-on:
+      - ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Check
+        run: nix flake check . --print-build-logs
+  x86_64-linux---whitepaper-upload:
+    name: Upload whitepaper x86_64-linux
+    runs-on: ubuntu-latest
+    if: ${{ github.ref == 'refs/heads/main' }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Git add git sha and commit
+        run: cd papers && ./tex/gitinfo2.sh && git add gitHeadInfo.gin
+      - name: Build
+        run: nix build .#packages.x86_64-linux.whitepaper --print-build-logs
       - name: Deploy PDF artifacts
-        if: ${{ matrix.derivation == 'whitepaper' && github.ref == 'refs/heads/main' }}
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ${{ matrix.derivation }}-${{ matrix.nix-system }}
+          publish_dir: result/
           publish_branch: papers-pdf
           force_orphan: true
-  checks:
-    name: Run Nix checks
-    runs-on: nixos
-    needs: build
-    steps:
-      - uses: actions/checkout@v3
-      - name: Run Checks
-        run: nix flake check . --print-build-logs

.github/workflows/qc.yaml

@@ -1,4 +1,4 @@
-name: Quality Control
+name: QC
 on:
   pull_request:
   push:
@@ -12,15 +12,31 @@ jobs:
   prettier:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actionsx/prettier@v2
         with:
           args: --check .
 
+  shellcheck:
+    name: Shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run ShellCheck
+        uses: ludeeus/action-shellcheck@master
+
+  cargo-audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
   cargo-clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/cache@v3
         with:
           path: |
@@ -31,17 +47,104 @@ jobs:
             target/
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
       - run: rustup component add clippy
-      - name: Install xmllint
+      - name: Install libsodium
         run: sudo apt-get install -y libsodium-dev
       - uses: actions-rs/clippy-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features
 
-  cargo-audit:
+  cargo-doc:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions-rs/audit-check@v1
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - run: rustup component add clippy
+      - name: Install libsodium
+        run: sudo apt-get install -y libsodium-dev
+      # `--no-deps` used as a workaround for a rust compiler bug. See:
+      # - https://github.com/rosenpass/rosenpass/issues/62
+      # - https://github.com/rust-lang/rust/issues/108378
+      - run: RUSTDOCFLAGS="-D warnings" cargo doc --no-deps --document-private-items
+
+  cargo-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - name: Install libsodium
+        run: sudo apt-get install -y libsodium-dev
+        # liboqs requires quite a lot of stack memory, thus we adjust
+        # the default stack size picked for new threads (which is used
+        # by `cargo test`) to be _big enough_. Setting it to 8 MiB
+      - run: RUST_MIN_STACK=8388608 cargo test
+
+  cargo-test-nix-devshell-x86_64-linux:
+    runs-on:
+      - ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - uses: cachix/install-nix-action@v21
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - run: nix develop --command cargo test
+
+  cargo-fuzz:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+      - name: Install libsodium
+        run: sudo apt-get install -y libsodium-dev
+      - name: Install nightly toolchain
+        run: |
+          rustup toolchain install nightly
+          rustup default nightly
+      - name: Install cargo-fuzz
+        run: cargo install cargo-fuzz
+      - name: Run fuzzing
+        run: |
+          cargo fuzz run fuzz_aead_enc_into -- -max_total_time=5
+          cargo fuzz run fuzz_blake2b -- -max_total_time=5
+          cargo fuzz run fuzz_handle_msg -- -max_total_time=5
+          ulimit -s 8192000 && RUST_MIN_STACK=33554432000 && cargo fuzz run fuzz_kyber_encaps -- -max_total_time=5
+          cargo fuzz run fuzz_mceliece_encaps -- -max_total_time=5
+          cargo fuzz run fuzz_box_sodium_alloc -- -max_total_time=5
+          cargo fuzz run fuzz_vec_sodium_alloc -- -max_total_time=5

.github/workflows/release.yaml

@@ -3,28 +3,69 @@ permissions:
   contents: write
 on:
   push:
-    tags: ["v*"]
-
+    tags:
+      - v*
 jobs:
-  release:
-    name: Release for ${{ matrix.nix-system }}
+  i686-linux---release:
+    name: Build release artifacts for i686-linux
     runs-on:
-      - nix
-      - ${{ matrix.nix-system }}
-    strategy:
-      fail-fast: false
-      matrix:
-        nix-system:
-          - x86_64-linux
-          # - aarch64-linux
+      - ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Build release-package for ${{ matrix.nix-system }}
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build release
         run: nix build .#release-package --print-build-logs
       - name: Release
         uses: softprops/action-gh-release@v1
         with:
           draft: ${{ contains(github.ref_name, 'rc') }}
           prerelease: ${{ contains(github.ref_name, 'alpha') || contains(github.ref_name, 'beta') }}
-          files: |
-            result/*
+          files: result/*
+  x86_64-darwin---release:
+    name: Build release artifacts for x86_64-darwin
+    runs-on:
+      - macos-13
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build release
+        run: nix build .#release-package --print-build-logs
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: ${{ contains(github.ref_name, 'rc') }}
+          prerelease: ${{ contains(github.ref_name, 'alpha') || contains(github.ref_name, 'beta') }}
+          files: result/*
+  x86_64-linux---release:
+    name: Build release artifacts for x86_64-linux
+    runs-on:
+      - ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - uses: cachix/cachix-action@v12
+        with:
+          name: rosenpass
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+      - name: Build release
+        run: nix build .#release-package --print-build-logs
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: ${{ contains(github.ref_name, 'rc') }}
+          prerelease: ${{ contains(github.ref_name, 'alpha') || contains(github.ref_name, 'beta') }}
+          files: result/*

.gitlab-ci.yml

@@ -0,0 +1,17 @@
+# TODO use CI_JOB_TOKEN once https://gitlab.com/groups/gitlab-org/-/epics/6310 is fixed
+pull-from-gh:
+  only: ["schedules"]
+  variables:
+    REMOTE: "https://github.com/rosenpass/rosenpass.git"
+    LOCAL: " git@gitlab.com:rosenpass/rosenpass.git"
+    GIT_STRATEGY: none
+  before_script:
+    - mkdir ~/.ssh/
+    - echo "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts
+    - echo "$REPO_SSH_KEY" > ~/.ssh/id_ed25519
+    - chmod 600 --recursive ~/.ssh/
+    - git config --global user.email "ci@gitlab.com"
+    - git config --global user.name "CI"
+  script:
+    - git clone --mirror $REMOTE rosenpass
+    - cd rosenpass && git push --mirror $LOCAL

Cargo.toml

@@ -1,35 +1,61 @@
-[package]
-name = "rosenpass"
-version = "0.1.1"
-authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
-edition = "2021"
-license = "MIT OR Apache-2.0"
-description = "Build post-quantum-secure VPNs with WireGuard!"
-homepage = "https://rosenpass.eu/"
-repository = "https://github.com/rosenpass/rosenpass"
-readme = "readme.md"
+[workspace]
+resolver = "2"
 
-[[bench]]
-name = "handshake"
-harness = false
+members = [
+    "rosenpass",
+    "cipher-traits",
+    "ciphers",
+    "util",
+    "constant-time",
+    "sodium",
+    "oqs",
+    "to",
+    "fuzz",
+    "secret-memory",
+    "lenses",
+    "rosenpass-log",
+]
 
-[dependencies]
-anyhow = { version = "1.0.52", features = ["backtrace"] }
-base64 = "0.13.0"
-clap = { version = "3.0.0", features = ["yaml"] }
-static_assertions = "1.1.0"
-memoffset = "0.6.5"
-libsodium-sys-stable = { version = "1.19.26", features = ["use-pkg-config"] }
-oqs-sys = { version = "0.7.1", default-features = false, features = ['classic_mceliece', 'kyber'] }
-lazy_static = "1.4.0"
-thiserror = "1.0.38"
-paste = "1.0.11"
-log = { version = "0.4.17", optional = true }
-env_logger = { version = "0.10.0", optional = true }
+default-members = [
+    "rosenpass"
+]
 
-[dev-dependencies]
-criterion = "0.3.5"
+[workspace.metadata.release]
+# ensure that adding `--package` as argument to `cargo release` still creates version tags in the form of `vx.y.z`
+tag-prefix = ""
+
+[workspace.dependencies]
+rosenpass = { path = "rosenpass" }
+rosenpass-util = { path = "util" }
+rosenpass-constant-time = { path = "constant-time" }
+rosenpass-sodium = { path = "sodium" }
+rosenpass-cipher-traits = { path = "cipher-traits" }
+rosenpass-ciphers = { path = "ciphers" }
+rosenpass-to = { path = "to" }
+rosenpass-secret-memory = { path = "secret-memory" }
+rosenpass-oqs = { path = "oqs" }
+rosenpass-lenses = { path = "lenses" }
+criterion = "0.4.0"
 test_bin = "0.4.0"
-
-[features]
-default = ["log", "env_logger"]
+libfuzzer-sys = "0.4"
+stacker = "0.1.15"
+doc-comment = "0.3.3"
+base64 = "0.21.5"
+zeroize = "1.7.0"
+memoffset = "0.9.0"
+lazy_static = "1.4.0"
+thiserror = "1.0.50"
+paste = "1.0.14"
+env_logger = "0.10.1"
+toml = "0.7.8"
+static_assertions = "1.1.0"
+allocator-api2 = "0.2.16"
+rand = "0.8.5"
+log = { version = "0.4.20" }
+clap = { version = "4.4.10", features = ["derive"] }
+serde = { version = "1.0.193", features = ["derive"] }
+arbitrary = { version = "1.3.2", features = ["derive"] }
+anyhow = { version = "1.0.75", features = ["backtrace", "std"] }
+mio = { version = "0.8.9", features = ["net", "os-poll"] }
+libsodium-sys-stable= { version = "1.20.4", features = ["use-pkg-config"] }
+oqs-sys = { version = "0.8", default-features = false, features = ['classic_mceliece', 'kyber']  }

cipher-traits/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "rosenpass-cipher-traits"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal traits for cryptographic primitives"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+[dependencies]

cipher-traits/readme.md

@@ -0,0 +1,5 @@
+# Rosenpass internal libsodium bindings
+
+Rosenpass internal library providing traits for cryptographic primitives.
+
+This is an internal library; not guarantee is made about its API at this point in time.

cipher-traits/src/kem.rs

@@ -0,0 +1,47 @@
+//! Traits and implementations for Key Encapsulation Mechanisms (KEMs)
+//!
+//! KEMs are the interface provided by almost all post-quantum
+//! secure key exchange mechanisms.
+//!
+//! Conceptually KEMs are akin to public-key encryption, but instead of encrypting
+//! arbitrary data, KEMs are limited to the transmission of keys, randomly chosen during
+//!
+//! encapsulation.
+//! The [KEM] Trait describes the basic API offered by a Key Encapsulation
+//! Mechanism. Two implementations for it are provided, [StaticKEM] and [EphemeralKEM].
+
+use std::result::Result;
+
+/// Key Encapsulation Mechanism
+///
+/// The KEM interface defines three operations: Key generation, key encapsulation and key
+/// decapsulation.
+pub trait Kem {
+    type Error;
+
+    /// Secrete Key length
+    const SK_LEN: usize;
+    /// Public Key length
+    const PK_LEN: usize;
+    /// Ciphertext length
+    const CT_LEN: usize;
+    /// Shared Secret length
+    const SHK_LEN: usize;
+
+    /// Generate a keypair consisting of secret key (`sk`) and public key (`pk`)
+    ///
+    /// `keygen() -> sk, pk`
+    fn keygen(sk: &mut [u8], pk: &mut [u8]) -> Result<(), Self::Error>;
+
+    /// From a public key (`pk`), generate a shared key (`shk`, for local use)
+    /// and a cipher text (`ct`, to be sent to the owner of the `pk`).
+    ///
+    /// `encaps(pk) -> shk, ct`
+    fn encaps(shk: &mut [u8], ct: &mut [u8], pk: &[u8]) -> Result<(), Self::Error>;
+
+    /// From a secret key (`sk`) and a cipher text (`ct`) derive a shared key
+    /// (`shk`)
+    ///
+    /// `decaps(sk, ct) -> shk`
+    fn decaps(shk: &mut [u8], sk: &[u8], ct: &[u8]) -> Result<(), Self::Error>;
+}

cipher-traits/src/lib.rs

@@ -0,0 +1,2 @@
+mod kem;
+pub use kem::Kem;

ciphers/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "rosenpass-ciphers"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal ciphers and other cryptographic primitives used by rosenpass."
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+[dependencies]
+anyhow = { workspace = true }
+rosenpass-sodium = { workspace = true }
+rosenpass-to = { workspace = true }
+rosenpass-constant-time = { workspace = true }
+rosenpass-secret-memory = { workspace = true }
+rosenpass-oqs = { workspace = true }
+static_assertions = { workspace = true }
+zeroize = { workspace = true }

ciphers/readme.md

@@ -0,0 +1,5 @@
+# Rosenpass internal cryptographic primitives
+
+Ciphers and other cryptographic primitives used by rosenpass.
+
+This is an internal library; not guarantee is made about its API at this point in time.

ciphers/src/hash_domain.rs

@@ -0,0 +1,109 @@
+use anyhow::Result;
+use rosenpass_secret_memory::Secret;
+use rosenpass_to::To;
+
+use crate::subtle::incorrect_hmac_blake2b as hash;
+
+pub use hash::KEY_LEN;
+
+// TODO Use a proper Dec interface
+#[derive(Clone, Debug)]
+pub struct HashDomain([u8; KEY_LEN]);
+#[derive(Clone, Debug)]
+pub struct HashDomainNamespace([u8; KEY_LEN]);
+#[derive(Clone, Debug)]
+pub struct SecretHashDomain(Secret<KEY_LEN>);
+#[derive(Clone, Debug)]
+pub struct SecretHashDomainNamespace(Secret<KEY_LEN>);
+
+impl HashDomain {
+    pub fn zero() -> Self {
+        Self([0u8; KEY_LEN])
+    }
+
+    pub fn dup(self) -> HashDomainNamespace {
+        HashDomainNamespace(self.0)
+    }
+
+    pub fn turn_secret(self) -> SecretHashDomain {
+        SecretHashDomain(Secret::from_slice(&self.0))
+    }
+
+    // TODO: Protocol! Use domain separation to ensure that
+    pub fn mix(self, v: &[u8]) -> Result<Self> {
+        Ok(Self(hash::hash(&self.0, v).collect::<[u8; KEY_LEN]>()?))
+    }
+
+    pub fn mix_secret<const N: usize>(self, v: Secret<N>) -> Result<SecretHashDomain> {
+        SecretHashDomain::invoke_primitive(&self.0, v.secret())
+    }
+
+    pub fn into_value(self) -> [u8; KEY_LEN] {
+        self.0
+    }
+}
+
+impl HashDomainNamespace {
+    pub fn mix(&self, v: &[u8]) -> Result<HashDomain> {
+        Ok(HashDomain(
+            hash::hash(&self.0, v).collect::<[u8; KEY_LEN]>()?,
+        ))
+    }
+
+    pub fn mix_secret<const N: usize>(&self, v: Secret<N>) -> Result<SecretHashDomain> {
+        SecretHashDomain::invoke_primitive(&self.0, v.secret())
+    }
+}
+
+impl SecretHashDomain {
+    pub fn invoke_primitive(k: &[u8], d: &[u8]) -> Result<SecretHashDomain> {
+        let mut r = SecretHashDomain(Secret::zero());
+        hash::hash(k, d).to(r.0.secret_mut())?;
+        Ok(r)
+    }
+
+    pub fn zero() -> Self {
+        Self(Secret::zero())
+    }
+
+    pub fn dup(self) -> SecretHashDomainNamespace {
+        SecretHashDomainNamespace(self.0)
+    }
+
+    pub fn danger_from_secret(k: Secret<KEY_LEN>) -> Self {
+        Self(k)
+    }
+
+    pub fn mix(self, v: &[u8]) -> Result<SecretHashDomain> {
+        Self::invoke_primitive(self.0.secret(), v)
+    }
+
+    pub fn mix_secret<const N: usize>(self, v: Secret<N>) -> Result<SecretHashDomain> {
+        Self::invoke_primitive(self.0.secret(), v.secret())
+    }
+
+    pub fn into_secret(self) -> Secret<KEY_LEN> {
+        self.0
+    }
+
+    pub fn into_secret_slice(mut self, v: &[u8], dst: &[u8]) -> Result<()> {
+        hash::hash(v, dst).to(self.0.secret_mut())
+    }
+}
+
+impl SecretHashDomainNamespace {
+    pub fn mix(&self, v: &[u8]) -> Result<SecretHashDomain> {
+        SecretHashDomain::invoke_primitive(self.0.secret(), v)
+    }
+
+    pub fn mix_secret<const N: usize>(&self, v: Secret<N>) -> Result<SecretHashDomain> {
+        SecretHashDomain::invoke_primitive(self.0.secret(), v.secret())
+    }
+
+    // TODO: This entire API is not very nice; we need this for biscuits, but
+    // it might be better to extract a special "biscuit"
+    // labeled subkey and reinitialize the chain with this
+    pub fn danger_into_secret(self) -> Secret<KEY_LEN> {
+        self.0
+    }
+}

ciphers/src/lib.rs

@@ -0,0 +1,29 @@
+use static_assertions::const_assert;
+
+pub mod subtle;
+
+pub const KEY_LEN: usize = 32;
+const_assert!(KEY_LEN == aead::KEY_LEN);
+const_assert!(KEY_LEN == xaead::KEY_LEN);
+const_assert!(KEY_LEN == hash_domain::KEY_LEN);
+
+/// Authenticated encryption with associated data
+pub mod aead {
+    pub use rosenpass_sodium::aead::chacha20poly1305_ietf::{
+        decrypt, encrypt, KEY_LEN, NONCE_LEN, TAG_LEN,
+    };
+}
+
+/// Authenticated encryption with associated data with a constant nonce
+pub mod xaead {
+    pub use rosenpass_sodium::aead::xchacha20poly1305_ietf::{
+        decrypt, encrypt, KEY_LEN, NONCE_LEN, TAG_LEN,
+    };
+}
+
+pub mod hash_domain;
+
+pub mod kem {
+    pub use rosenpass_oqs::ClassicMceliece460896 as StaticKem;
+    pub use rosenpass_oqs::Kyber512 as EphemeralKem;
+}

ciphers/src/subtle/incorrect_hmac_blake2b.rs

@@ -0,0 +1,44 @@
+use anyhow::ensure;
+use rosenpass_constant_time::xor;
+use rosenpass_sodium::hash::blake2b;
+use rosenpass_to::{ops::copy_slice, with_destination, To};
+use zeroize::Zeroizing;
+
+pub const KEY_LEN: usize = 32;
+pub const KEY_MIN: usize = KEY_LEN;
+pub const KEY_MAX: usize = KEY_LEN;
+pub const OUT_MIN: usize = blake2b::OUT_MIN;
+pub const OUT_MAX: usize = blake2b::OUT_MAX;
+
+/// This is a woefully incorrect implementation of hmac_blake2b.
+/// See <https://github.com/rosenpass/rosenpass/issues/68#issuecomment-1563612222>
+///
+/// It accepts 32 byte keys, exclusively.
+///
+/// This will be replaced, likely by Kekkac at some point soon.
+/// <https://github.com/rosenpass/rosenpass/pull/145>
+#[inline]
+pub fn hash<'a>(key: &'a [u8], data: &'a [u8]) -> impl To<[u8], anyhow::Result<()>> + 'a {
+    const IPAD: [u8; KEY_LEN] = [0x36u8; KEY_LEN];
+    const OPAD: [u8; KEY_LEN] = [0x5Cu8; KEY_LEN];
+
+    with_destination(|out: &mut [u8]| {
+        // Not bothering with padding; the implementation
+        // uses appropriately sized keys.
+        ensure!(key.len() == KEY_LEN);
+
+        type Key = Zeroizing<[u8; KEY_LEN]>;
+        let mut tmp_key = Key::default();
+
+        copy_slice(key).to(tmp_key.as_mut());
+        xor(&IPAD).to(tmp_key.as_mut());
+        let mut outer_data = Key::default();
+        blake2b::hash(tmp_key.as_ref(), data).to(outer_data.as_mut())?;
+
+        copy_slice(key).to(tmp_key.as_mut());
+        xor(&OPAD).to(tmp_key.as_mut());
+        blake2b::hash(tmp_key.as_ref(), outer_data.as_ref()).to(out)?;
+
+        Ok(())
+    })
+}

ciphers/src/subtle/mod.rs

@@ -0,0 +1 @@
+pub mod incorrect_hmac_blake2b;

config-examples/.gitignore

@@ -0,0 +1,2 @@
+peer-*-*-key
+peer-*-out

config-examples/peer-a-config.toml

@@ -0,0 +1,18 @@
+public_key = "peer-a-public-key"
+secret_key = "peer-a-secret-key"
+listen = ["[::]:10001"]
+verbosity = "Quiet"
+
+[[peers]]
+public_key = "peer-b-public-key"
+endpoint = "localhost:10002"
+key_out = "peer-a-rp-out-key"
+# exchange_command = [
+#     "wg",
+#     "set",
+#     "wg0",
+#     "peer",
+#     "<PEER_ID>",
+#     "preshared-key",
+#     "/dev/stdin",
+# ]

config-examples/peer-b-config.toml

@@ -0,0 +1,18 @@
+public_key = "peer-b-public-key"
+secret_key = "peer-b-secret-key"
+listen = ["[::]:10002"]
+verbosity = "Quiet"
+
+[[peers]]
+public_key = "peer-a-public-key"
+endpoint = "localhost:10001"
+key_out = "peer-b-rp-out-key"
+# exchange_command = [
+#     "wg",
+#     "set",
+#     "wg0",
+#     "peer",
+#     "<PEER_ID>",
+#     "preshared-key",
+#     "/dev/stdin",
+# ]

constant-time/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "rosenpass-constant-time"
+version = "0.1.0"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal utilities for constant time crypto implementations"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rosenpass-to = { workspace = true }

constant-time/readme.md

@@ -0,0 +1,5 @@
+# Rosenpass constant time library
+
+Rosenpass internal library providing basic constant-time operations.
+
+This is an internal library; not guarantee is made about its API at this point in time.

constant-time/src/lib.rs

@@ -0,0 +1,26 @@
+use rosenpass_to::{with_destination, To};
+
+/// Xors the source into the destination
+///
+/// # Examples
+///
+/// ```
+/// use rosenpass_constant_time::xor;
+/// use rosenpass_to::To;
+/// assert_eq!(
+///     xor(b"world").to_this(|| b"hello".to_vec()),
+///     b"\x1f\n\x1e\x00\x0b");
+/// ```
+///
+/// # Panics
+///
+/// If source and destination are of different sizes.
+#[inline]
+pub fn xor<'a>(src: &'a [u8]) -> impl To<[u8], ()> + 'a {
+    with_destination(|dst: &mut [u8]| {
+        assert!(src.len() == dst.len());
+        for (dv, sv) in dst.iter_mut().zip(src.iter()) {
+            *dv ^= *sv;
+        }
+    })
+}

doc/rosenpass.1

@@ -0,0 +1,114 @@
+.Dd $Mdocdate$
+.Dt ROSENPASS 1
+.Os
+.Sh NAME
+.Nm rosenpass
+.Nd builds post-quantum-secure VPNs
+.Sh SYNOPSIS
+.Nm
+.Op COMMAND
+.Op Ar OPTIONS ...
+.Op Ar ARGS ...
+.Sh DESCRIPTION
+.Nm
+performs cryptographic key exchanges that are secure against quantum-computers
+and then outputs the keys.
+These keys can then be passed to various services, such as wireguard or other
+vpn services, as pre-shared-keys to achieve security against attackers with
+quantum computers.
+.Pp
+This is a research project and quantum computers are not thought to become
+practical in fewer than ten years.
+If you are not specifically tasked with developing post-quantum secure systems,
+you probably do not need this tool.
+.Ss COMMANDS
+.Bl -tag -width Ds
+.It Ar keygen private-key <file-path> public-key <file-path>
+Generate a keypair to use in the exchange command later.
+Send the public-key file to your communication partner and keep the private-key
+file secret!
+.It Ar exchange private-key <file-path> public-key <file-path> [ OPTIONS ] PEERS
+Start a process to exchange keys with the specified peers.
+You should specify at least one peer.
+.Pp
+Its
+.Ar OPTIONS
+are as follows:
+.Bl -tag -width Ds
+.It Ar listen <ip>[:<port>]
+Instructs
+.Nm
+to listen on the specified interface and port.
+By default,
+.Nm
+will listen on all interfaces and select a random port.
+.It Ar verbose
+Extra logging.
+.El
+.El
+.Ss PEER
+Each
+.Ar PEER
+is defined as follows:
+.Qq peer public-key <file-path> [endpoint <ip>[:<port>]] [preshared-key <file-path>] [outfile <file-path>] [wireguard <dev> <peer> <extra_params>]
+.Pp
+Providing a
+.Ar PEER
+instructs
+.Nm
+to exchange keys with the given peer and write the resulting PSK into the given
+output file.
+You must either specify the outfile or wireguard output option.
+.Pp
+The parameters of
+.Ar PEER
+are as follows:
+.Bl -tag -width Ds
+.It Ar endpoint <ip>[:<port>]
+Specifies the address where the peer can be reached.
+This will be automatically updated after the first successful key exchange with
+the peer.
+If this is unspecified, the peer must initiate the connection.
+.It Ar preshared-key <file-path>
+You may specify a pre-shared key which will be mixed into the final secret.
+.It Ar outfile <file-path>
+You may specify a file to write the exchanged keys to.
+If this option is specified,
+.Nm
+will write a notification to standard out every time the key is updated.
+.It Ar wireguard <dev> <peer> <extra_params>
+This allows you to directly specify a wireguard peer to deploy the
+pre-shared-key to.
+You may specify extra parameters you would pass to
+.Qq wg set
+besides the preshared-key parameter which is used by
+.Nm .
+This makes it possible to add peers entirely from
+.Nm .
+.El
+.Sh EXIT STATUS
+.Ex -std
+.Sh SEE ALSO
+.Xr rp 1 ,
+.Xr wg 1
+.Rs
+.%A Karolin Varner
+.%A Benjamin Lipp
+.%A Wanja Zaeske
+.%A Lisa Schmidt
+.%D 2023
+.%T Rosenpass
+.%U https://rosenpass.eu/whitepaper.pdf
+.Re
+.Sh STANDARDS
+This tool is the reference implementation of the Rosenpass protocol, as
+specified within the whitepaper referenced above.
+.Sh AUTHORS
+Rosenpass was created by Karolin Varner, Benjamin Lipp, Wanja Zaeske,
+Marei Peischl, Stephan Ajuvo, and Lisa Schmidt.
+.Pp
+This manual page was written by
+.An Emil Engler
+.Sh BUGS
+The bugs are tracked at
+.Lk https://github.com/rosenpass/rosenpass/issues .

doc/rp.1

@@ -0,0 +1,119 @@
+.Dd $Mdocdate$
+.Dt RP 1
+.Os
+.Sh NAME
+.Nm rp
+.Nd high-level interface to rosenpass
+.Sh SYNOPSIS
+.Nm
+.Op Ar explain
+.Op Ar verbose
+.Ar genkey Ar ... | Ar pubkey ... | Ar exchange ...
+.Nm
+.Op ...
+.Ar genkey PRIVATE_KEYS_DIR
+.Nm
+.Op ...
+.Ar pubkey Ar PRIVATE_KEYS_DIR Ar PUBLIC_KEYS_DIR
+.Nm
+.Op ...
+.\" Splitting this across several lines
+.Ar exchange Ar PRIVATE_KEYS_DIR
+.Op dev <device>
+.Op listen <ip>:<port>
+.\" Because the peer argument is complicated, it would be heel to represent it
+.\" in mdoc... Using an ugly hack instead, thereby losing semantic.
+[peer PUBLIC_KEYS_DIR [endpoint <ip>:<port>] [persistent-keepalive <interval>]
+[allowed-ips <ip1>/<cidr1>[,<ip2>/<cidr2>] ...]] ...
+.Sh DESCRIPTION
+The
+.Nm
+program
+is used to build a VPN with WireGuard and Rosenpass.
+.Pp
+The optional
+.Op explain
+and
+.Op verbose
+options can be used to obtain further help or to enable a detailed view on the
+operations, respectively.
+.Ss COMMANDS
+.Bl -tag -width Ds
+.It Ar genkey Ar PRIVATE_KEYS_DIR
+Creates a new directory with appropriate permissions and generates all the
+necessary private keys required for a peer to participate in a rosenpass
+connection.
+.It Ar pubkey Ar PRIVATE_KEYS_DIR Ar PUBLIC_KEYS_DIR
+Creates a fresh directory at
+.Ar PUBLIC_KEYS_DIR ,
+which contains the extracted public keys from the private keys generated by
+.Ar genkey
+and located inside
+.Ar PRIVATE_KEYS_DIR .
+.It Ar exchange Ar PRIVATE_KEYS_DIR [dev <device>] [listen <ip>:<port>] [PEERS]
+Starts the VPN on interface
+.Ar device ,
+listening on the provided IP and port combination, allowing connections from
+.Ar PEERS .
+.El
+.Sh EXIT STATUS
+.Ex -std
+.Sh EXAMPLES
+In this example, we will assume that the server has an interface bound to
+192.168.0.1, that accepts incoming connections on port 9999/UDP for Rosenpass
+and port 10000/UDP for WireGuard.
+.Pp
+To create a VPN connection, start by generating secret keys on both hosts.
+.Bd -literal -offset indent
+rp genkey server.rosenpass-secret
+rp genkey client.rosenpass-secret
+.Ed
+.Pp
+Extract the public keys:
+.Bd -literal -offset indent
+rp pubkey server.rosenpass-secret server.rosenpass-public
+rp pubkey client.rosenpass-secret client.rosenpass-public
+.Ed
+.Pp
+Copy the
+.Qq -public
+directories to the other peers and then start the VPN.
+On the server:
+.Bd -literal -offset indent
+sudo rp exchange server.rosenpass-secret dev rosenpass0 listen 192.168.0.1:9999 \\
+    peer client.rosenpass-public allowed-ips fe80::/64
+.Ed
+.Pp
+On the client:
+.Bd -literal -offset indent
+sudo rp exchange client.rosenpass-secret dev rosenpass 0 \\
+    peer server.rosenpass-public endpoint 192.168.0.1:9999 allowed-ips fe80::/64
+.Ed
+.Pp
+Assign IP addresses:
+.Bd -literal -offset indent
+sudo ip a add fe80::1/64 dev rosenpass0 # Server
+sudo ip a add fe80::2/64 dev rosenpass0 # Client
+.Ed
+.Pp
+Test the connection by pinging the server on the client machine:
+.Bd -literal -offset indent
+ping fe80::1%rosenpass0 # Client
+.Ed
+.Pp
+You can watch how rosenpass replaces the WireGuard PSK with the following:
+.Bd -literal -offset indent
+watch -n 0.2 'wg show all; wg show all preshared-keys'
+.Ed
+.Sh SEE ALSO
+.Xr rosenpass 1 ,
+.Xr wg 1
+.Sh AUTHORS
+Rosenpass was created by Karolin Varner, Benjamin Lipp, Wanja Zaeske,
+Marei Peischl, Stephan Ajuvo, and Lisa Schmidt.
+.Pp
+This manual page was written by
+.An Emil Engler
+.Sh BUGS
+The bugs are tracked at
+.Lk https://github.com/rosenpass/rosenpass/issues .

flake.lock

@@ -8,11 +8,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1674240251,
-        "narHash": "sha256-AVMmf/CtcGensTZmMicToDpOwySEGNKYgRPC7lu3m8w=",
+        "lastModified": 1699770036,
+        "narHash": "sha256-bZmI7ytPAYLpyFNgj5xirDkKuAniOkj1xHdv5aIJ5GM=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "d8067f4d1d3d30732703209bec5ca7d62aaececc",
+        "rev": "81ab0b4f7ae9ebb57daa0edf119c4891806e4d3a",
         "type": "github"
       },
       "original": {
@@ -22,12 +22,15 @@
       }
     },
     "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
       "locked": {
-        "lastModified": 1667395993,
-        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
         "type": "github"
       },
       "original": {
@@ -36,13 +39,33 @@
         "type": "github"
       }
     },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698420672,
+        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "aeb58d5e8faead8980a807c840232697982d47b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1672968032,
-        "narHash": "sha256-26Jns3GmHem44a06UN5Rj/KOD9qNJThyQrom02Ijur8=",
+        "lastModified": 1698846319,
+        "narHash": "sha256-4jyW/dqFBVpWFnhl0nvP6EN4lP7/ZqPxYRjl6var0Oc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2dea8991d89b9f1e78d874945f78ca15f6954289",
+        "rev": "34bdaaf1f0b7fb6d9091472edc968ff10a8c2857",
         "type": "github"
       },
       "original": {
@@ -50,37 +73,22 @@
         "type": "indirect"
       }
     },
-    "nixpkgs-unstable": {
-      "locked": {
-        "lastModified": 1676496762,
-        "narHash": "sha256-GFAxjaTgh8KJ8q7BYaI4EVGI5K98ooW70fG/83rSb08=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "1bddde315297c092712b0ef03d9def7a474b28ae",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
         "fenix": "fenix",
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs",
-        "nixpkgs-unstable": "nixpkgs-unstable"
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs"
       }
     },
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1674162026,
-        "narHash": "sha256-iY0bxoVE7zAZmp0BB/m5hZW5pWHUfgntDvc1m2zyt/U=",
+        "lastModified": 1699715108,
+        "narHash": "sha256-yPozsobJU55gj+szgo4Lpcg1lHvGQYAT6Y4MrC80mWE=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "6e52c64031825920983515b9e975e93232739f7f",
+        "rev": "5fcf5289e726785d20d3aa4d13d90a43ed248e83",
         "type": "github"
       },
       "original": {
@@ -89,6 +97,21 @@
         "repo": "rust-analyzer",
         "type": "github"
       }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -1,8 +1,11 @@
 {
   inputs = {
-    nixpkgs-unstable.url = "github:NixOS/nixpkgs";
     flake-utils.url = "github:numtide/flake-utils";
 
+    # for quicker rust builds
+    naersk.url = "github:nix-community/naersk";
+    naersk.inputs.nixpkgs.follows = "nixpkgs";
+
     # for rust nightly with llvm-tools-preview
     fenix.url = "github:nix-community/fenix";
     fenix.inputs.nixpkgs.follows = "nixpkgs";
@@ -19,12 +22,16 @@
         "aarch64-linux"
 
         # unsuported best-effort
+        "i686-linux"
         "x86_64-darwin"
         "aarch64-darwin"
         # "x86_64-windows"
       ]
         (system:
           let
+            scoped = (scope: scope.result);
+            lib = nixpkgs.lib;
+
             # normal nixpkgs
             pkgs = import nixpkgs {
               inherit system;
@@ -47,14 +54,41 @@
                 )
               ];
             };
+
             # parsed Cargo.toml
-            cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+            cargoToml = builtins.fromTOML (builtins.readFile ./rosenpass/Cargo.toml);
+
             # source files relevant for rust
-            src = pkgs.lib.sourceByRegex ./. [
-              "Cargo\\.(toml|lock)"
-              "(src|benches)(/.*\\.(rs|md))?"
-              "rp"
-            ];
+            src = scoped rec {
+              # File suffices to include
+              extensions = [
+                "lock"
+                "rs"
+                "toml"
+              ];
+              # Files to explicitly include
+              files = [
+                "to/README.md"
+              ];
+
+              src = ./.;
+              filter = (path: type: scoped rec {
+                inherit (lib) any id removePrefix hasSuffix;
+                anyof = (any id);
+
+                basename = baseNameOf (toString path);
+                relative = removePrefix (toString src + "/") (toString path);
+
+                result = anyof [
+                  (type == "directory")
+                  (any (ext: hasSuffix ".${ext}" basename) extensions)
+                  (any (file: file == relative) files)
+                ];
+              });
+
+              result = pkgs.lib.sources.cleanSourceWith { inherit src filter; };
+            };
+
             # builds a bin path for all dependencies for the `rp` shellscript
             rpBinPath = p: with p; lib.makeBinPath [
               coreutils
@@ -62,60 +96,119 @@
               gawk
               wireguard-tools
             ];
+
             # a function to generate a nix derivation for rosenpass against any
             # given set of nixpkgs
             rpDerivation = p:
               let
-                isStatic = p.stdenv.hostPlatform.isStatic;
-              in
-              p.rustPlatform.buildRustPackage {
-                # metadata and source
-                pname = cargoToml.package.name;
-                version = cargoToml.package.version;
-                inherit src;
-                cargoLock = {
-                  lockFile = src + "/Cargo.lock";
+                # whether we want to build a statically linked binary
+                isStatic = p.targetPlatform.isStatic;
+
+                # the rust target of `p`
+                target = p.rust.toRustTargetSpec p.targetPlatform;
+
+                # convert a string to shout case
+                shout = string: builtins.replaceStrings [ "-" ] [ "_" ] (pkgs.lib.toUpper string);
+
+                # suitable Rust toolchain
+                toolchain = with inputs.fenix.packages.${system}; combine [
+                  stable.cargo
+                  stable.rustc
+                  targets.${target}.stable.rust-std
+                ];
+
+                # naersk with a custom toolchain
+                naersk = pkgs.callPackage inputs.naersk {
+                  cargo = toolchain;
+                  rustc = toolchain;
                 };
 
-                nativeBuildInputs = with pkgs; [
-                  cmake # for oqs build in the oqs-sys crate
-                  makeWrapper # for the rp shellscript
-                  pkg-config # let libsodium-sys-stable find libsodium
-                  removeReferencesTo
-                  rustPlatform.bindgenHook # for C-bindings in the crypto libs
-                ];
-                buildInputs = with p; [ bash libsodium ];
+                # used to trick the build.rs into believing that CMake was ran **again**
+                fakecmake = pkgs.writeScriptBin "cmake" ''
+                  #! ${pkgs.stdenv.shell} -e
+                  true
+                '';
+              in
+              naersk.buildPackage
+                {
+                  # metadata and source
+                  name = cargoToml.package.name;
+                  version = cargoToml.package.version;
+                  inherit src;
 
+                  cargoBuildOptions = x: x ++ [ "-p" "rosenpass" ];
+                  cargoTestOptions = x: x ++ [ "-p" "rosenpass" ];
+
+                  doCheck = true;
+
+                  nativeBuildInputs = with pkgs; [
+                    p.stdenv.cc
+                    cmake # for oqs build in the oqs-sys crate
+                    mandoc # for the built-in manual
+                    makeWrapper # for the rp shellscript
+                    pkg-config # let libsodium-sys-stable find libsodium
+                    removeReferencesTo
+                    rustPlatform.bindgenHook # for C-bindings in the crypto libs
+                  ];
+                  buildInputs = with p; [ bash libsodium ];
+
+                  override = x: {
+                    preBuild =
+                      # nix defaults to building for aarch64 _without_ the armv8-a crypto
+                      # extensions, but liboqs depens on these
+                      (lib.optionalString (system == "aarch64-linux") ''
+                        NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -march=armv8-a+crypto"
+                      ''
+                      );
+
+                    # fortify is only compatible with dynamic linking
+                    hardeningDisable = lib.optional isStatic "fortify";
+                  };
+
+                  overrideMain = x: {
+                    # CMake detects that it was served a _foreign_ target dir, and CMake
+                    # would be executed again upon the second build step of naersk.
+                    # By adding our specially optimized CMake version, we reduce the cost
+                    # of recompilation by 99 % while, while avoiding any CMake errors.
+                    nativeBuildInputs = [ (lib.hiPrio fakecmake) ] ++ x.nativeBuildInputs;
+
+                    # make sure that libc is linked, under musl this is not the case per
+                    # default
+                    preBuild = (lib.optionalString isStatic ''
+                      NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -lc"
+                    '');
+
+                    preInstall = ''
+                      install -D ${./rp} $out/bin/rp
+                      wrapProgram $out/bin/rp --prefix PATH : "${ rpBinPath p }"
+                    '';
+                  };
+
+                  # We want to build for a specific target...
+                  CARGO_BUILD_TARGET = target;
+
+                  # ... which might require a non-default linker:
+                  "CARGO_TARGET_${shout target}_LINKER" =
+                    let
+                      inherit (p.stdenv) cc;
+                    in
+                    "${cc}/bin/${cc.targetPrefix}cc";
+
+                  meta = with pkgs.lib;
+                    {
+                      inherit (cargoToml.package) description homepage;
+                      license = with licenses; [ mit asl20 ];
+                      maintainers = [ maintainers.wucke13 ];
+                      platforms = platforms.all;
+                    };
+                } // (lib.mkIf isStatic {
                 # otherwise pkg-config tries to link non-existent dynamic libs
+                # documented here: https://docs.rs/pkg-config/latest/pkg_config/
                 PKG_CONFIG_ALL_STATIC = true;
 
-                # nix defaults to building for aarch64 _without_ the armv8-a
-                # crypto extensions, but liboqs depens on these
-                preBuild =
-                  if system == "aarch64-linux" then ''
-                    NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -march=armv8-a+crypto"
-                  '' else "";
-
-                preInstall = ''
-                  install -D rp $out/bin/rp
-                  wrapProgram $out/bin/rp --prefix PATH : "${ rpBinPath p }"
-                '';
-
-                # nix progated the *.dev outputs of buildInputs for static
-                # builds, but that is non-sense for an executables only package
-                postFixup =
-                  if isStatic then ''
-                    remove-references-to -t ${p.bash.dev} -t ${p.libsodium.dev} \
-                      $out/nix-support/propagated-build-inputs
-                  '' else "";
-
-                meta = with pkgs.lib; {
-                  inherit (cargoToml.package) description homepage;
-                  license = with licenses; [ mit asl20 ];
-                  maintainers = [ maintainers.wucke13 ];
-                  platforms = platforms.all;
-                };
-              };
+                # tell rust to build everything statically linked
+                CARGO_BUILD_RUSTFLAGS = "-C target-feature=+crt-static";
+              });
             # a function to generate a docker image based of rosenpass
             rosenpassOCI = name: pkgs.dockerTools.buildImage rec {
               inherit name;
@@ -178,14 +271,11 @@
           #
           packages.whitepaper =
             let
-              pkgs = import inputs.nixpkgs-unstable {
-                inherit system;
-              };
               tlsetup = (pkgs.texlive.combine {
                 inherit (pkgs.texlive) scheme-basic acmart amsfonts ccicons
                   csquotes csvsimple doclicense fancyvrb fontspec gobble
                   koma-script ifmtarg latexmk lm markdown mathtools minted noto
-                  nunito pgf soul soulutf8 unicode-math lualatex-math
+                  nunito pgf soul unicode-math lualatex-math paralist
                   gitinfo2 eso-pic biblatex biblatex-trad biblatex-software
                   xkeyval xurl xifthen biber;
               });
@@ -201,7 +291,6 @@
               ];
               buildPhase = ''
                 export HOME=$(mktemp -d)
-                export OSFONTDIR="$(kpsewhich --var-value TEXMF)/fonts/{opentype/public/nunito,truetype/google/noto}"
                 latexmk -r tex/CI.rc
               '';
               installPhase = ''
@@ -222,7 +311,7 @@
           packages.proof-proverif = pkgs.stdenv.mkDerivation {
             name = "rosenpass-proverif-proof";
             version = "unstable";
-            src = pkgs.lib.sourceByRegex ./. [
+            src = pkgs.lib.sources.sourceByRegex ./. [
               "analyze.sh"
               "marzipan(/marzipan.awk)?"
               "analysis(/.*)?"
@@ -243,6 +332,7 @@
             inherit (packages.proof-proverif) CRYPTOVERIF_LIB;
             inputsFrom = [ packages.default ];
             nativeBuildInputs = with pkgs; [
+              cmake # override the fakecmake from the main step above
               cargo-release
               clippy
               nodePackages.prettier
@@ -257,12 +347,10 @@
 
 
           checks = {
-            # Blocked by https://github.com/rust-lang/rustfmt/issues/4306
-            # @dakoraa wants a coding style suitable for her accessible coding setup
-            # cargo-fmt = pkgs.runCommand "check-cargo-fmt"
-            #  { inherit (devShells.default) nativeBuildInputs buildInputs; } ''
-            #  cargo fmt --manifest-path=${src}/Cargo.toml --check > $out
-            # '';
+            cargo-fmt = pkgs.runCommand "check-cargo-fmt"
+              { inherit (self.devShells.${system}.default) nativeBuildInputs buildInputs; } ''
+              cargo fmt --manifest-path=${./.}/Cargo.toml --check --all && touch $out
+            '';
             nixpkgs-fmt = pkgs.runCommand "check-nixpkgs-fmt"
               { nativeBuildInputs = [ pkgs.nixpkgs-fmt ]; } ''
               nixpkgs-fmt --check ${./.} && touch $out
@@ -272,6 +360,8 @@
               cd ${./.} && prettier --check . && touch $out
             '';
           };
+
+          formatter = pkgs.nixpkgs-fmt;
         }))
     ];
 }

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

@@ -0,0 +1,61 @@
+[package]
+name = "rosenpass-fuzzing"
+version = "0.0.1"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+arbitrary = { workspace = true }
+libfuzzer-sys = { workspace = true }
+stacker = { workspace = true }
+rosenpass-secret-memory = { workspace = true }
+rosenpass-sodium = { workspace = true }
+rosenpass-ciphers = { workspace = true }
+rosenpass-cipher-traits = { workspace = true }
+rosenpass-to = { workspace = true }
+rosenpass = { workspace = true }
+
+[[bin]]
+name = "fuzz_handle_msg"
+path = "fuzz_targets/handle_msg.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_blake2b"
+path = "fuzz_targets/blake2b.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_aead_enc_into"
+path = "fuzz_targets/aead_enc_into.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_mceliece_encaps"
+path = "fuzz_targets/mceliece_encaps.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_kyber_encaps"
+path = "fuzz_targets/kyber_encaps.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_box_sodium_alloc"
+path = "fuzz_targets/box_sodium_alloc.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "fuzz_vec_sodium_alloc"
+path = "fuzz_targets/vec_sodium_alloc.rs"
+test = false
+doc = false

fuzz/fuzz_targets/aead_enc_into.rs

@@ -0,0 +1,32 @@
+#![no_main]
+extern crate arbitrary;
+extern crate rosenpass;
+
+use libfuzzer_sys::fuzz_target;
+
+use rosenpass_ciphers::aead;
+use rosenpass_sodium::init as sodium_init;
+
+#[derive(arbitrary::Arbitrary, Debug)]
+pub struct Input {
+    pub key: [u8; 32],
+    pub nonce: [u8; 12],
+    pub ad: Box<[u8]>,
+    pub plaintext: Box<[u8]>,
+}
+
+fuzz_target!(|input: Input| {
+    sodium_init().unwrap();
+
+    let mut ciphertext: Vec<u8> = Vec::with_capacity(input.plaintext.len() + 16);
+    ciphertext.resize(input.plaintext.len() + 16, 0);
+
+    aead::encrypt(
+        ciphertext.as_mut_slice(),
+        &input.key,
+        &input.nonce,
+        &input.ad,
+        &input.plaintext,
+    )
+    .unwrap();
+});

fuzz/fuzz_targets/blake2b.rs

@@ -0,0 +1,22 @@
+#![no_main]
+extern crate arbitrary;
+extern crate rosenpass;
+
+use libfuzzer_sys::fuzz_target;
+
+use rosenpass_sodium::{hash::blake2b, init as sodium_init};
+use rosenpass_to::To;
+
+#[derive(arbitrary::Arbitrary, Debug)]
+pub struct Blake2b {
+    pub key: [u8; 32],
+    pub data: Box<[u8]>,
+}
+
+fuzz_target!(|input: Blake2b| {
+    sodium_init().unwrap();
+
+    let mut out = [0u8; 32];
+
+    blake2b::hash(&input.key, &input.data).to(&mut out).unwrap();
+});

fuzz/fuzz_targets/box_sodium_alloc.rs

@@ -0,0 +1,12 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use rosenpass_sodium::{
+    alloc::{Alloc as SodiumAlloc, Box as SodiumBox},
+    init,
+};
+
+fuzz_target!(|data: &[u8]| {
+    let _ = init();
+    let _ = SodiumBox::new_in(data, SodiumAlloc::new());
+});

fuzz/fuzz_targets/handle_msg.rs

@@ -0,0 +1,21 @@
+#![no_main]
+extern crate rosenpass;
+
+use libfuzzer_sys::fuzz_target;
+
+use rosenpass::protocol::CryptoServer;
+use rosenpass_secret_memory::Secret;
+use rosenpass_sodium::init as sodium_init;
+
+fuzz_target!(|rx_buf: &[u8]| {
+    sodium_init().unwrap();
+
+    let sk = Secret::from_slice(&[0; 13568]);
+    let pk = Secret::from_slice(&[0; 524160]);
+
+    let mut cs = CryptoServer::new(sk, pk);
+    let mut tx_buf = [0; 10240];
+
+    // We expect errors while fuzzing therefore we do not check the result.
+    let _ = cs.handle_msg(rx_buf, &mut tx_buf);
+});

fuzz/fuzz_targets/kyber_encaps.rs

@@ -0,0 +1,20 @@
+#![no_main]
+extern crate arbitrary;
+extern crate rosenpass;
+
+use libfuzzer_sys::fuzz_target;
+
+use rosenpass_cipher_traits::Kem;
+use rosenpass_ciphers::kem::EphemeralKem;
+
+#[derive(arbitrary::Arbitrary, Debug)]
+pub struct Input {
+    pub pk: [u8; 800],
+}
+
+fuzz_target!(|input: Input| {
+    let mut ciphertext = [0u8; 768];
+    let mut shared_secret = [0u8; 32];
+
+    EphemeralKem::encaps(&mut shared_secret, &mut ciphertext, &input.pk).unwrap();
+});

fuzz/fuzz_targets/mceliece_encaps.rs

@@ -0,0 +1,15 @@
+#![no_main]
+extern crate rosenpass;
+
+use libfuzzer_sys::fuzz_target;
+
+use rosenpass_cipher_traits::Kem;
+use rosenpass_ciphers::kem::StaticKem;
+
+fuzz_target!(|input: [u8; StaticKem::PK_LEN]| {
+    let mut ciphertext = [0u8; 188];
+    let mut shared_secret = [0u8; 32];
+
+    // We expect errors while fuzzing therefore we do not check the result.
+    let _ = StaticKem::encaps(&mut shared_secret, &mut ciphertext, &input);
+});

fuzz/fuzz_targets/vec_sodium_alloc.rs

@@ -0,0 +1,13 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use rosenpass_sodium::{
+    alloc::{Alloc as SodiumAlloc, Vec as SodiumVec},
+    init,
+};
+
+fuzz_target!(|data: &[u8]| {
+    let _ = init();
+    let mut vec = SodiumVec::new_in(SodiumAlloc::new());
+    vec.extend_from_slice(data);
+});

lenses/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "rosenpass-lenses"
+version = "0.1.0"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal library for parsing binary data securely"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+paste = { workspace = true }
+thiserror = { workspace = true }

lenses/readme.md

@@ -0,0 +1,3 @@
+# Rosenpass internal binary parsing library
+
+This is an internal library; no guarantee is made about its API at this point in time.

lenses/src/lib.rs

@@ -0,0 +1,206 @@
+use std::result::Result;
+
+/// Common trait shared by all Lenses
+pub trait LenseView {
+    const LEN: usize;
+}
+
+/// Error during lense creation
+#[derive(thiserror::Error, Debug, Eq, PartialEq, Clone)]
+pub enum LenseError {
+    #[error("buffer size mismatch")]
+    BufferSizeMismatch,
+}
+
+pub type LenseResult<T> = Result<T, LenseError>;
+
+impl LenseError {
+    pub fn ensure_exact_buffer_size(len: usize, required: usize) -> LenseResult<()> {
+        (len == required)
+            .then_some(())
+            .ok_or(LenseError::BufferSizeMismatch)
+    }
+
+    pub fn ensure_sufficient_buffer_size(len: usize, required: usize) -> LenseResult<()> {
+        (len >= required)
+            .then_some(())
+            .ok_or(LenseError::BufferSizeMismatch)
+    }
+}
+
+/// A macro to create data lenses.
+#[macro_export]
+macro_rules! lense(
+    // prefix          @ offset       ; optional meta    ; field name   : field length, ...
+    (token_muncher_ref @ $offset:expr ; $( $attr:meta )* ; $field:ident : $len:expr $(, $( $tail:tt )+ )?) =>  {
+        ::paste::paste!{
+
+        #[allow(rustdoc::broken_intra_doc_links)]
+        $( #[ $attr ] )*
+        ///
+        #[doc = lense!(maybe_docstring_link $len)]
+        /// bytes long
+        pub fn $field(&self) -> &__ContainerType::Output {
+            &self.0[$offset .. $offset + $len]
+        }
+
+        /// The bytes until the
+        #[doc = lense!(maybe_docstring_link Self::$field)]
+        /// field
+        pub fn [< until_ $field >](&self) -> &__ContainerType::Output {
+            &self.0[0 .. $offset]
+        }
+
+        // if the tail exits, consume it as well
+        $(
+        lense!{token_muncher_ref @ $offset + $len ; $( $tail )+ }
+        )?
+        }
+    };
+
+    // prefix          @ offset       ; optional meta    ; field name   : field length, ...
+    (token_muncher_mut @ $offset:expr ; $( $attr:meta )* ; $field:ident : $len:expr $(, $( $tail:tt )+ )?) =>  {
+        ::paste::paste!{
+
+        #[allow(rustdoc::broken_intra_doc_links)]
+        $( #[ $attr ] )*
+        ///
+        #[doc = lense!(maybe_docstring_link $len)]
+        /// bytes long
+        pub fn [< $field _mut >](&mut self) -> &mut __ContainerType::Output {
+            &mut self.0[$offset .. $offset + $len]
+        }
+
+        // if the tail exits, consume it as well
+        $(
+        lense!{token_muncher_mut @ $offset + $len ; $( $tail )+ }
+        )?
+        }
+    };
+
+    // switch that yields literals unchanged, but creates docstring links to
+    // constants
+    // TODO the doc string link doesn't work if $x is taken from a generic,
+    (maybe_docstring_link $x:literal) => (stringify!($x));
+    (maybe_docstring_link $x:expr) => (stringify!([$x]));
+
+    // struct name  < optional generics     >    := optional doc string      field name   : field length, ...
+($type:ident $( < $( $generic:ident ),+ > )? := $( $( #[ $attr:meta ] )* $field:ident : $len:expr ),+) => (::paste::paste!{
+
+        #[allow(rustdoc::broken_intra_doc_links)]
+        /// A data lense to manipulate byte slices.
+        ///
+        //// # Fields
+        ///
+        $(
+        /// - `
+        #[doc = stringify!($field)]
+        /// `:
+        #[doc = lense!(maybe_docstring_link $len)]
+        /// bytes
+        )+
+        pub struct $type<__ContainerType $(, $( $generic ),+ )? > (
+            __ContainerType,
+            // The phantom data is required, since all generics declared on a
+            // type need to be used on the type.
+            // https://doc.rust-lang.org/stable/error_codes/E0392.html
+            $( $( ::core::marker::PhantomData<$generic> ),+ )?
+        );
+
+        impl<__ContainerType $(, $( $generic: LenseView ),+ )? > $type<__ContainerType $(, $( $generic ),+ )? >{
+            $(
+            /// Size in bytes of the field `
+            #[doc = !($field)]
+            /// `
+            pub const fn [< $field _len >]() -> usize{
+                $len
+            }
+            )+
+
+            /// Verify that `len` exactly holds [Self]
+            pub fn check_size(len: usize) -> ::rosenpass_lenses::LenseResult<()> {
+                ::rosenpass_lenses::LenseError::ensure_exact_buffer_size(len, $( $len + )+ 0)
+            }
+        }
+
+        // read-only accessor functions
+        impl<'a, __ContainerType $(, $( $generic: LenseView ),+ )?> $type<&'a __ContainerType $(, $( $generic ),+ )?>
+        where
+            __ContainerType: std::ops::Index<std::ops::Range<usize>> + ?Sized,
+        {
+            lense!{token_muncher_ref @ 0 ; $( $( $attr )* ; $field : $len ),+ }
+
+            /// View into all bytes belonging to this Lense
+            pub fn all_bytes(&self) -> &__ContainerType::Output {
+                &self.0[0..Self::LEN]
+            }
+        }
+
+        // mutable accessor functions
+        impl<'a, __ContainerType $(, $( $generic: LenseView ),+ )?> $type<&'a mut __ContainerType $(, $( $generic ),+ )?>
+        where
+            __ContainerType: std::ops::IndexMut<std::ops::Range<usize>> + ?Sized,
+        {
+            lense!{token_muncher_ref @ 0 ; $( $( $attr )* ; $field : $len ),+ }
+            lense!{token_muncher_mut @ 0 ; $( $( $attr )* ; $field : $len ),+ }
+
+            /// View into all bytes belonging to this Lense
+            pub fn all_bytes(&self) -> &__ContainerType::Output {
+                &self.0[0..Self::LEN]
+            }
+
+            /// View into all bytes belonging to this Lense
+            pub fn all_bytes_mut(&mut self) -> &mut __ContainerType::Output {
+                &mut self.0[0..Self::LEN]
+            }
+        }
+
+        // lense trait, allowing us to know the implementing lenses size
+        impl<__ContainerType $(, $( $generic: LenseView ),+ )? > LenseView for $type<__ContainerType $(, $( $generic ),+ )? >{
+            /// Number of bytes required to store this type in binary format
+            const LEN: usize = $( $len + )+ 0;
+        }
+
+        /// Extension trait to allow checked creation of a lense over
+        /// some byte slice that contains a
+        #[doc = lense!(maybe_docstring_link $type)]
+        pub trait [< $type Ext >] {
+            type __ContainerType;
+
+            /// Create a lense to the byte slice
+            fn [< $type:snake >] $(< $($generic : LenseView),* >)? (self) -> ::rosenpass_lenses::LenseResult< $type<Self::__ContainerType, $( $($generic),+ )? >>;
+
+            /// Create a lense to the byte slice, automatically truncating oversized buffers
+            fn [< $type:snake _ truncating >] $(< $($generic : LenseView),* >)? (self) -> ::rosenpass_lenses::LenseResult< $type<Self::__ContainerType, $( $($generic),+ )? >>;
+        }
+
+        impl<'a> [< $type Ext >] for &'a [u8] {
+            type __ContainerType = &'a [u8];
+
+            fn [< $type:snake >] $(< $($generic : LenseView),* >)? (self) -> ::rosenpass_lenses::LenseResult< $type<Self::__ContainerType, $( $($generic),+ )? >> {
+                $type::<Self::__ContainerType, $( $($generic),+ )? >::check_size(self.len())?;
+                Ok($type ( self, $( $( ::core::marker::PhantomData::<$generic>  ),+ )? ))
+            }
+
+            fn [< $type:snake _ truncating >] $(< $($generic : LenseView),* >)? (self) -> ::rosenpass_lenses::LenseResult< $type<Self::__ContainerType, $( $($generic),+ )? >> {
+                let required_size = $( $len + )+ 0;
+                ::rosenpass_lenses::LenseError::ensure_sufficient_buffer_size(self.len(), required_size)?;
+                [< $type Ext >]::[< $type:snake >](&self[..required_size])
+            }
+        }
+
+        impl<'a> [< $type Ext >] for &'a mut [u8] {
+            type __ContainerType = &'a mut [u8];
+            fn [< $type:snake >] $(< $($generic : LenseView),* >)? (self) -> ::rosenpass_lenses::LenseResult< $type<Self::__ContainerType, $( $($generic),+ )? >> {
+                $type::<Self::__ContainerType, $( $($generic),+ )? >::check_size(self.len())?;
+                Ok($type ( self, $( $( ::core::marker::PhantomData::<$generic>  ),+ )? ))
+            }
+
+            fn [< $type:snake _ truncating >] $(< $($generic : LenseView),* >)? (self) -> ::rosenpass_lenses::LenseResult< $type<Self::__ContainerType, $( $($generic),+ )? >> {
+                let required_size = $( $len + )+ 0;
+                ::rosenpass_lenses::LenseError::ensure_sufficient_buffer_size(self.len(), required_size)?;
+                [< $type Ext >]::[< $type:snake >](&mut self[..required_size])
+            }
+        }
+    });
+);

oqs/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "rosenpass-oqs"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal bindings to liboqs"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+[dependencies]
+rosenpass-cipher-traits = { workspace = true }
+rosenpass-util = { workspace = true }
+oqs-sys = { workspace = true }
+paste = { workspace = true }

oqs/readme.md

@@ -0,0 +1,5 @@
+# Rosenpass internal liboqs bindings
+
+Rosenpass internal library providing bindings to liboqs.
+
+This is an internal library; not guarantee is made about its API at this point in time.

oqs/src/kem_macro.rs

@@ -0,0 +1,80 @@
+macro_rules! oqs_kem {
+    ($name:ident) => { ::paste::paste!{
+        mod [< $name:snake >] {
+            use rosenpass_cipher_traits::Kem;
+            use rosenpass_util::result::Guaranteed;
+
+            pub enum [< $name:camel >]  {}
+
+            /// # Panic & Safety
+            ///
+            /// This Trait impl calls unsafe [oqs_sys] functions, that write to byte
+            /// slices only identified using raw pointers. It must be ensured that the raw
+            /// pointers point into byte slices of sufficient length, to avoid UB through
+            /// overwriting of arbitrary data. This is ensured through assertions in the
+            /// implementation.
+            ///
+            /// __Note__: This requirement is stricter than necessary, it would suffice
+            /// to only check that the buffers are big enough, allowing them to be even
+            /// bigger. However, from a correctness point of view it does not make sense to
+            /// allow bigger buffers.
+            impl Kem for [< $name:camel >] {
+                type Error = ::std::convert::Infallible;
+
+                const SK_LEN: usize =  ::oqs_sys::kem::[<OQS_KEM _ $name:snake _ length_secret_key >] as usize;
+                const PK_LEN: usize =  ::oqs_sys::kem::[<OQS_KEM _ $name:snake _ length_public_key >] as usize;
+                const CT_LEN: usize =  ::oqs_sys::kem::[<OQS_KEM _ $name:snake _ length_ciphertext >] as usize;
+                const SHK_LEN: usize =  ::oqs_sys::kem::[<OQS_KEM _ $name:snake _ length_shared_secret >] as usize;
+
+                fn keygen(sk: &mut [u8], pk: &mut [u8]) -> Guaranteed<()> {
+                    assert_eq!(sk.len(), Self::SK_LEN);
+                    assert_eq!(pk.len(), Self::PK_LEN);
+                    unsafe {
+                        oqs_call!(
+                            ::oqs_sys::kem::[< OQS_KEM _ $name:snake _ keypair >],
+                            pk.as_mut_ptr(),
+                            sk.as_mut_ptr()
+                        );
+                    }
+
+                    Ok(())
+                }
+
+                fn encaps(shk: &mut [u8], ct: &mut [u8], pk: &[u8]) -> Guaranteed<()> {
+                    assert_eq!(shk.len(), Self::SHK_LEN);
+                    assert_eq!(ct.len(), Self::CT_LEN);
+                    assert_eq!(pk.len(), Self::PK_LEN);
+                    unsafe {
+                        oqs_call!(
+                            ::oqs_sys::kem::[< OQS_KEM _ $name:snake _ encaps >],
+                            ct.as_mut_ptr(),
+                            shk.as_mut_ptr(),
+                            pk.as_ptr()
+                        );
+                    }
+
+                    Ok(())
+                }
+
+                fn decaps(shk: &mut [u8], sk: &[u8], ct: &[u8]) -> Guaranteed<()> {
+                    assert_eq!(shk.len(), Self::SHK_LEN);
+                    assert_eq!(sk.len(), Self::SK_LEN);
+                    assert_eq!(ct.len(), Self::CT_LEN);
+                    unsafe {
+                        oqs_call!(
+                            ::oqs_sys::kem::[< OQS_KEM _ $name:snake _ decaps >],
+                            shk.as_mut_ptr(),
+                            ct.as_ptr(),
+                            sk.as_ptr()
+                        );
+                    }
+
+                    Ok(())
+                }
+            }
+
+        }
+
+        pub use [< $name:snake >] :: [< $name:camel >];
+    }}
+}

oqs/src/lib.rs

@@ -0,0 +1,21 @@
+macro_rules! oqs_call {
+    ($name:path, $($args:expr),*) => {{
+        use oqs_sys::common::OQS_STATUS::*;
+
+        match $name($($args),*) {
+            OQS_SUCCESS => {}, // nop
+            OQS_EXTERNAL_LIB_ERROR_OPENSSL => {
+                panic!("OpenSSL error in liboqs' {}.", stringify!($name));
+            },
+            OQS_ERROR => {
+                panic!("Unknown error in liboqs' {}.", stringify!($name));
+            }
+        }
+    }};
+    ($name:ident) => { oqs_call!($name, ) };
+}
+
+#[macro_use]
+mod kem_macro;
+oqs_kem!(kyber_512);
+oqs_kem!(classic_mceliece_460896);

papers/graphics/rosenpass-wp-hashing-tree.svg

@@ -1345,7 +1345,7 @@
                 <g transform="matrix(1,0,0,1,420.66,-1031.32)">
                     <g transform="matrix(31.25,0,0,31.25,1431.32,1459.33)">
                     </g>
-                    <text x="1179.63px" y="1459.33px" style="font-family:'Nunito-Medium', 'Nunito';font-weight:500;font-size:31.25px;">&quot;k<tspan x="1207.79px 1224.25px " y="1459.33px 1459.33px ">ey</tspan> chaining init&quot;</text>
+                    <text x="1179.63px" y="1459.33px" style="font-family:'Nunito-Medium', 'Nunito';font-weight:500;font-size:31.25px;">&quot;chaining k<tspan x="1334px 1350.47px " y="1459.33px 1459.33px ">ey</tspan> init&quot;</text>
                 </g>
             </g>
             <g transform="matrix(0.389246,0,0,0.136584,299.374,1166.87)">
@@ -1437,7 +1437,7 @@
             <g transform="matrix(0.99675,0,0,0.996238,-597.124,-172.692)">
                 <g transform="matrix(31.25,0,0,31.25,1492.94,1459.33)">
                 </g>
-                <text x="1187.16px" y="1459.33px" style="font-family:'Nunito-Medium', 'Nunito';font-weight:500;font-size:31.25px;">&quot;k<tspan x="1215.32px 1231.79px " y="1459.33px 1459.33px ">ey</tspan> chaining e<tspan x="1398.88px " y="1459.33px ">x</tspan>tr<tspan x="1437.88px " y="1459.33px ">a</tspan>ct&quot;</text>
+                <text x="1187.16px" y="1459.33px" style="font-family:'Nunito-Medium', 'Nunito';font-weight:500;font-size:31.25px;">&quot;chaining k<tspan x="1341.54px 1358px " y="1459.33px 1459.33px ">ey</tspan> e<tspan x="1398.88px " y="1459.33px ">x</tspan>tr<tspan x="1437.88px " y="1459.33px ">a</tspan>ct&quot;</text>
             </g>
             <g transform="matrix(0.99675,0,0,0.996238,-380.054,-779.158)">
                 <g transform="matrix(31.25,0,0,31.25,1463.54,1459.33)">

papers/tex/markdown-wrapper.tex

@@ -79,6 +79,8 @@
 	letter-csv .initial:n = ,
 	letter-content .tl_set:N = \l_letter_csv_content_tl,
 	letter-content .initial:n=,
+	tableofcontents .bool_gset:N = \g__ptxcd_tableofcontents_bool,
+	tableofcontents .initial:n = true,
 }
 
 \tl_new:N \l__markdown_sequence_tl

papers/tex/template-rosenpass.tex

@@ -171,8 +171,17 @@ version={4.0},
 \ExplSyntaxOn
 \SetTemplatePreamble{
 	\hypersetup{pdftitle=\inserttitle,pdfauthor=The~Rosenpass~Project}
-	\title{\vspace*{-2.5cm}\includegraphics[width=4cm]{RosenPass-Logo}}
-	\author{\csname insertauthor\endcsname}
+	\exp_args:NV\tl_if_eq:nnTF \inserttitle{Rosenpass} {
+		\title{\vspace*{-2.5cm}\includegraphics[width=4cm]{RosenPass-Logo}}
+	} {
+		\titlehead{\centerline{\includegraphics[width=4cm]{RosenPass-Logo}}}
+		\title{\inserttitle}
+	}
+	\ifx\csname insertauthor\endcsname\relax
+	\author{}
+	\else
+	\author{\parbox{\linewidth}{\centering\insertauthor}}
+	\fi
 	\subject{\csname insertsubject\endcsname}
 	\date{\vspace{-1cm}}
 }
@@ -374,29 +383,28 @@ version={4.0},
 	}
 }
 }
-\makeatother
-\ExplSyntaxOff
+
 % end of namepartpicturesetup
 
 \newcommand{\captionbox}[1]{{\setlength{\fboxsep}{.5ex}\colorbox{rosenpass-gray}{#1}}}
 
-\makeatletter
 \renewenvironment{abstract}{
 	\small
 	\begin{center}\normalfont\sectfont\nobreak\abstractname\@endparpenalty\@M\end{center}%
 }{
 	\par
 }
-\makeatother
+
 
 \SetTemplateBegin{
 	\maketitle
 	\begin{abstract}
 	\noindent\csname insertabstract\endcsname
 	\end{abstract}
-	\tableofcontents
+	\bool_if:NT \g__ptxcd_tableofcontents_bool \tableofcontents
 	\clearpage
 }
+\makeatother
+\ExplSyntaxOff
 
-\SetTemplateEnd{
-}
+\SetTemplateEnd{}

papers/whitepaper.md

@@ -7,13 +7,13 @@ author:
 - Wanja Zaeske
 - Lisa Schmidt = {Scientific Illustrator – \\url{mullana.de}}
 abstract: |
-       Rosenpass is used to create post-quantum-secure VPNs. Rosenpass computes a shared key, WireGuard (WG) [@wg] uses the shared key to establish a secure connection. Rosenpass can also be used without WireGuard, deriving post-quantum-secure symmetric keys for some other application. The Rosenpass protocol builds on “Post-quantum WireGuard” (PQWG) [@pqwg] and improves it by using a cookie mechanism to provide security against state disruption attacks.
+       Rosenpass is used to create post-quantum-secure VPNs. Rosenpass computes a shared key, WireGuard (WG) [@wg] uses the shared key to establish a secure connection. Rosenpass can also be used without WireGuard, deriving post-quantum-secure symmetric keys for another application. The Rosenpass protocol builds on “Post-quantum WireGuard” (PQWG) [@pqwg] and improves it by using a cookie mechanism to provide security against state disruption attacks.
 
        The WireGuard implementation enjoys great trust from the cryptography community and has excellent performance characteristics. To preserve these features, the Rosenpass application runs side-by-side with WireGuard and supplies a new post-quantum-secure pre-shared key (PSK) every two minutes. WireGuard itself still performs the pre-quantum-secure key exchange and transfers any transport data with no involvement from Rosenpass at all.
 
        The Rosenpass project consists of a protocol description, an implementation written in Rust, and a symbolic analysis of the protocol’s security using ProVerif [@proverif]. We are working on a cryptographic security proof using CryptoVerif [@cryptoverif].
 
-       This document is a guide to engineers and researchers implementing the protocol; a scientific paper discussing the security properties of Rosenpass is work in progress.
+       This document is a guide for engineers and researchers implementing the protocol; a scientific paper discussing the security properties of Rosenpass is work in progress.
 ---
 
 \enlargethispage{5mm}
@@ -169,7 +169,7 @@ Rosenpass uses a cryptographic hash function for multiple purposes:
 * Computing the cookie to guard against denial of service attacks. This is a feature adopted from WireGuard, but not yet included in the implementation of Rosenpass.
 * Computing the peer ID
 * Key derivation during and after the handshake
-* Computing the additional data for the biscuit encryption, to prove some privacy for its contents
+* Computing the additional data for the biscuit encryption, to provide some privacy for its contents
 
 Using one hash function for multiple purposes can cause real-world security issues and even key recovery attacks [@oraclecloning]. We choose a tree-based domain separation scheme based on a keyed hash function – the previously introduced primitive `hash` – to make sure all our hash function calls can be seen as distinct.
 
@@ -237,7 +237,7 @@ For each peer, the server stores:
 The initiator stores the following local state for each ongoing handshake:
 
 * A reference to the peer structure
-* A state indicator to keep track of the message expected from the responder next
+* A state indicator to keep track of the next message expected from the responder
 * `sidi` – Initiator session ID
 * `sidr` – Responder session ID
 * `ck` – The chaining key

readme.md

@@ -14,14 +14,14 @@ This repository contains
 
 ## Getting started
 
-First, [install rosenpass](#Getting-Rosenpass). Then, check out the help funtions of `rp` & `rosenpass`:
+First, [install rosenpass](#Getting-Rosenpass). Then, check out the help functions of `rp` & `rosenpass`:
 
 ```sh
 rp help
 rosenpass help
 ```
 
-Follow [quickstart instructions](https://rosenpass.eu/#start) to get a VPN up and running.
+Follow [quick start instructions](https://rosenpass.eu/#start) to get a VPN up and running.
 
 ## Software architecture
 
@@ -54,7 +54,7 @@ We are working on a cryptographic proof of security, but we already provide a sy
 (manual) $ ./analyze.sh
 ```
 
-The analysis is implemented according to modern software engineering principles: Using the C preprocessor, we where able to split the analysis into multiple files and uses some metaprogramming to avoid repetition.
+The analysis is implemented according to modern software engineering principles: Using the C preprocessor, we where able to split the analysis into multiple files and uses some meta programming to avoid repetition.
 The code uses a variety of optimizations to speed up analysis such as using secret functions to model trusted/malicious setup. We split the model into two separate entry points which can be analyzed in parallel. Each is much faster than both models combined.
 A wrapper script provides instant feedback about which queries execute as expected in color: A red cross if a query fails and a green check if it succeeds.
 
@@ -62,15 +62,22 @@ A wrapper script provides instant feedback about which queries execute as expect
 [^libsodium]: https://doc.libsodium.org/
 [^wg]: https://www.wireguard.com/
 [^pqwg]: https://eprint.iacr.org/2020/379
-[^pqwg-statedis]: Unless supplied with a pre-shared-key, but this defeates the purpose of a key exchange protocol
+[^pqwg-statedis]: Unless supplied with a pre-shared-key, but this defeats the purpose of a key exchange protocol
 [^wg-statedis]: https://lists.zx2c4.com/pipermail/wireguard/2021-August/006916.htmlA
 
 # Getting Rosenpass
 
-Rosenpass is packaged for more and more distros, maybe also for the distro of your choice?
+Rosenpass is packaged for more and more distributions, maybe also for the distribution of your choice?
 
 [![Packaging status](https://repology.org/badge/vertical-allrepos/rosenpass.svg)](https://repology.org/project/rosenpass/versions)
 
+# Mirrors
+
+Don't want to use GitHub or only have an IPv6 connection? Rosenpass has set up two mirrors for this:
+
+- [NotABug](https://notabug.org/rosenpass/rosenpass)
+- [GitLab](https://gitlab.com/rosenpass/rosenpass/)
+
 # Supported by
 
 Funded through <a href="https://nlnet.nl/">NLNet</a> with financial support for the European Commission's <a href="https://nlnet.nl/assure">NGI Assure</a> program.

rosenpass-log/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "rosenpass-log"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+log.workspace = true

rosenpass-log/src/lib.rs

@@ -0,0 +1,110 @@
+#![allow(unused_macros)]
+/// Whenever a log event occurs, the cause of the event must be decided on. This cause will then
+/// be used to decide, if an actual log event is to be cause. The goal is to prevent especially
+/// external, unautherized entities from causing excessive loggin, which otherwise might open the
+/// door to MITM attacks
+pub enum Cause {
+    /// An unauthorized entitiy triggered this event via Network
+    ///
+    /// Example: a InitHello message in the rosenpass protocol
+    UnauthorizedNetwork,
+
+    /// An authorized entitity triggered this event via Network
+    ///
+    /// Example: a handshake was succesful (which asserts the peer is authorized)
+    AuthorizedNetwork,
+
+    /// A local entity like rosenpassctl triggered this event
+    ///
+    /// Example: the broker adds a new peer
+    LocalNetwork,
+
+    /// The user caused this event
+    ///
+    /// Examples:
+    /// - The process was started
+    /// - Ctrl+C was used to send sig SIGINT
+    User,
+
+    /// The developer wanted this in the log!
+    Developer,
+}
+
+// Rational: All events are to be displayed if trace level debugging is configured
+macro_rules! trace {
+    ($cause:expr, $($tail:tt)* ) => {{
+        use crate::Cause::*;
+        match $cause {
+            UnauthorizedNetwork | AuthorizedNetwork | LocalNetwork | User | Developer => {
+                ::log::trace!($($tail)*);
+            }
+        }
+    }}
+}
+
+// Rational: All events are to be displayed if debug level debugging is configured
+macro_rules! debug {
+    ($cause:expr, $($tail:tt)* ) => {{
+        use crate::Cause::*;
+        match $cause {
+            UnauthorizedNetwork | AuthorizedNetwork | LocalNetwork | User | Developer => {
+                ::log::debug!($($tail)*);
+            }
+        }
+    }}
+}
+
+// Rational: Only authorized causes shall be able to emit info messages
+macro_rules! info {
+    ($cause:expr, $($tail:tt)* ) => {{
+        use crate::Cause::*;
+        match $cause {
+            UnauthorizedNetwork => {},
+             AuthorizedNetwork | LocalNetwork | User | Developer => {
+                ::log::info!($($tail)*);
+            }
+        }
+    }}
+}
+
+// Rational: Only authorized causes shall be able to emit info messages
+macro_rules! warn {
+    ($cause:expr, $($tail:tt)* ) => {{
+        use crate::Cause::*;
+        match $cause {
+            UnauthorizedNetwork => {},
+            AuthorizedNetwork | LocalNetwork | User | Developer =>{
+                ::log::warn!($($tail)*);
+            }
+        }
+    }}
+}
+
+// Rational: Only local sources shall be able to cause errors to be displayed
+macro_rules! error {
+    ($cause:expr, $($tail:tt)* ) => {{
+        use crate::Cause::*;
+        match $cause {
+            UnauthorizedNetwork | AuthorizedNetwork => {},
+            LocalNetwork | User | Developer => {
+                ::log::error!($($tail)*);
+            }
+        }
+    }}
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn expand_all_macros() {
+        use Cause::*;
+
+        trace!(UnauthorizedNetwork, "beep");
+        debug!(UnauthorizedNetwork, "boop");
+        info!(LocalNetwork, "tock");
+        warn!(LocalNetwork, "möp");
+        error!(User, "knirsch");
+    }
+}

rosenpass/Cargo.toml

@@ -0,0 +1,45 @@
+[package]
+name = "rosenpass"
+version = "0.2.1"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Build post-quantum-secure VPNs with WireGuard!"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+[[bench]]
+name = "handshake"
+harness = false
+
+[dependencies]
+rosenpass-util = { workspace = true }
+rosenpass-constant-time = { workspace = true }
+rosenpass-sodium = { workspace = true }
+rosenpass-ciphers = { workspace = true }
+rosenpass-cipher-traits = { workspace = true }
+rosenpass-to = { workspace = true }
+rosenpass-secret-memory = { workspace = true }
+rosenpass-lenses = { workspace = true }
+anyhow = { workspace = true }
+static_assertions = { workspace = true }
+memoffset = { workspace = true }
+libsodium-sys-stable = { workspace = true }
+thiserror = { workspace = true }
+paste = { workspace = true }
+log = { workspace = true }
+env_logger = { workspace = true }
+serde = { workspace = true }
+toml = { workspace = true }
+clap = { workspace = true }
+mio = { workspace = true }
+rand = { workspace = true }
+
+[build-dependencies]
+anyhow = { workspace = true }
+
+[dev-dependencies]
+criterion = { workspace = true }
+test_bin = { workspace = true }
+stacker = { workspace = true }

rosenpass/benches/handshake.rs

@@ -1,17 +1,18 @@
 use anyhow::Result;
+use rosenpass::pqkem::KEM;
 use rosenpass::{
-    pqkem::{CCAKEM, KEM},
-    protocol::{CcaPk, CcaSk, HandleMsgResult, MsgBuf, PeerPtr, Server, SymKey},
+    pqkem::StaticKEM,
+    protocol::{CryptoServer, HandleMsgResult, MsgBuf, PeerPtr, SPk, SSk, SymKey},
     sodium::sodium_init,
 };
 
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
 
 fn handle(
-    tx: &mut Server,
+    tx: &mut CryptoServer,
     msgb: &mut MsgBuf,
     msgl: usize,
-    rx: &mut Server,
+    rx: &mut CryptoServer,
     resb: &mut MsgBuf,
 ) -> Result<(Option<SymKey>, Option<SymKey>)> {
     let HandleMsgResult {
@@ -30,7 +31,7 @@ fn handle(
     Ok((txk, rxk.or(xch)))
 }
 
-fn hs(ini: &mut Server, res: &mut Server) -> Result<()> {
+fn hs(ini: &mut CryptoServer, res: &mut CryptoServer) -> Result<()> {
     let (mut inib, mut resb) = (MsgBuf::zero(), MsgBuf::zero());
     let sz = ini.initiate_handshake(PeerPtr(0), &mut *inib)?;
     let (kini, kres) = handle(ini, &mut inib, sz, res, &mut resb)?;
@@ -38,16 +39,19 @@ fn hs(ini: &mut Server, res: &mut Server) -> Result<()> {
     Ok(())
 }
 
-fn keygen() -> Result<(CcaSk, CcaPk)> {
-    let (mut sk, mut pk) = (CcaSk::zero(), CcaPk::zero());
-    CCAKEM::keygen(sk.secret_mut(), pk.secret_mut())?;
+fn keygen() -> Result<(SSk, SPk)> {
+    let (mut sk, mut pk) = (SSk::zero(), SPk::zero());
+    StaticKEM::keygen(sk.secret_mut(), pk.secret_mut())?;
     Ok((sk, pk))
 }
 
-fn make_server_pair() -> Result<(Server, Server)> {
+fn make_server_pair() -> Result<(CryptoServer, CryptoServer)> {
     let psk = SymKey::random();
     let ((ska, pka), (skb, pkb)) = (keygen()?, keygen()?);
-    let (mut a, mut b) = (Server::new(ska, pka.clone()), Server::new(skb, pkb.clone()));
+    let (mut a, mut b) = (
+        CryptoServer::new(ska, pka.clone()),
+        CryptoServer::new(skb, pkb.clone()),
+    );
     a.add_peer(Some(psk.clone()), pkb)?;
     b.add_peer(Some(psk), pka)?;
     Ok((a, b))
@@ -58,12 +62,12 @@ fn criterion_benchmark(c: &mut Criterion) {
     let (mut a, mut b) = make_server_pair().unwrap();
     c.bench_function("cca_secret_alloc", |bench| {
         bench.iter(|| {
-            CcaSk::zero();
+            SSk::zero();
         })
     });
     c.bench_function("cca_public_alloc", |bench| {
         bench.iter(|| {
-            CcaPk::zero();
+            SPk::zero();
         })
     });
     c.bench_function("keygen", |bench| {

rosenpass/build.rs

@@ -0,0 +1,53 @@
+use anyhow::bail;
+use anyhow::Result;
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::Command;
+
+/// Invokes a troff compiler to compile a manual page
+fn render_man(compiler: &str, man: &str) -> Result<String> {
+    let out = Command::new(compiler).args(["-Tascii", man]).output()?;
+    if !out.status.success() {
+        bail!("{} returned an error", compiler);
+    }
+
+    Ok(String::from_utf8(out.stdout)?)
+}
+
+/// Generates the manual page
+fn generate_man() -> String {
+    // This function is purposely stupid and redundant
+
+    let man = render_man("mandoc", "./doc/rosenpass.1");
+    if let Ok(man) = man {
+        return man;
+    }
+
+    let man = render_man("groff", "./doc/rosenpass.1");
+    if let Ok(man) = man {
+        return man;
+    }
+
+    // TODO: Link to online manual here
+    "Cannot render manual page\n".into()
+}
+
+fn man() {
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let man = generate_man();
+    let path = out_dir.join("rosenpass.1.ascii");
+
+    let mut file = File::create(&path).unwrap();
+    file.write_all(man.as_bytes()).unwrap();
+
+    println!("cargo:rustc-env=ROSENPASS_MAN={}", path.display());
+}
+
+fn main() {
+    // For now, rerun the build script on every time, as the build script
+    // is not very expensive right now.
+    println!("cargo:rerun-if-changed=./");
+    man();
+}

rosenpass/readme.md

@@ -0,0 +1 @@
+../readme.md

rosenpass/src/app_server.rs

@@ -0,0 +1,739 @@
+use anyhow::bail;
+
+use anyhow::Result;
+use log::{debug, error, info, warn};
+use mio::Interest;
+use mio::Token;
+use rosenpass_util::file::fopen_w;
+
+use std::cell::Cell;
+use std::io::Write;
+
+use std::io::ErrorKind;
+use std::net::Ipv4Addr;
+use std::net::Ipv6Addr;
+use std::net::SocketAddr;
+use std::net::SocketAddrV4;
+use std::net::SocketAddrV6;
+use std::net::ToSocketAddrs;
+use std::path::PathBuf;
+use std::process::Command;
+use std::process::Stdio;
+use std::slice;
+use std::thread;
+use std::time::Duration;
+
+use crate::{
+    config::Verbosity,
+    protocol::{CryptoServer, MsgBuf, PeerPtr, SPk, SSk, SymKey, Timing},
+};
+use rosenpass_util::attempt;
+use rosenpass_util::b64::{b64_writer, fmt_b64};
+
+const IPV4_ANY_ADDR: Ipv4Addr = Ipv4Addr::new(0, 0, 0, 0);
+const IPV6_ANY_ADDR: Ipv6Addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0);
+
+fn ipv4_any_binding() -> SocketAddr {
+    // addr, port
+    SocketAddr::V4(SocketAddrV4::new(IPV4_ANY_ADDR, 0))
+}
+
+fn ipv6_any_binding() -> SocketAddr {
+    // addr, port, flowinfo, scope_id
+    SocketAddr::V6(SocketAddrV6::new(IPV6_ANY_ADDR, 0, 0, 0))
+}
+
+#[derive(Default, Debug)]
+pub struct AppPeer {
+    pub outfile: Option<PathBuf>,
+    pub outwg: Option<WireguardOut>, // TODO make this a generic command
+    pub initial_endpoint: Option<Endpoint>,
+    pub current_endpoint: Option<Endpoint>,
+}
+
+impl AppPeer {
+    pub fn endpoint(&self) -> Option<&Endpoint> {
+        self.current_endpoint
+            .as_ref()
+            .or(self.initial_endpoint.as_ref())
+    }
+}
+
+#[derive(Default, Debug)]
+pub struct WireguardOut {
+    // impl KeyOutput
+    pub dev: String,
+    pub pk: String,
+    pub extra_params: Vec<String>,
+}
+
+/// Holds the state of the application, namely the external IO
+///
+/// Responsible for file IO, network IO
+// TODO add user control via unix domain socket and stdin/stdout
+#[derive(Debug)]
+pub struct AppServer {
+    pub crypt: CryptoServer,
+    pub sockets: Vec<mio::net::UdpSocket>,
+    pub events: mio::Events,
+    pub mio_poll: mio::Poll,
+    pub peers: Vec<AppPeer>,
+    pub verbosity: Verbosity,
+    pub all_sockets_drained: bool,
+}
+
+/// A socket pointer is an index assigned to a socket;
+/// right now the index is just the sockets index in AppServer::sockets.
+///
+/// Holding this as a reference instead of an &mut UdpSocket is useful
+/// to deal with the borrow checker, because otherwise we could not refer
+/// to a socket and another member of AppServer at the same time.
+#[derive(Debug)]
+pub struct SocketPtr(pub usize);
+
+impl SocketPtr {
+    pub fn get<'a>(&self, srv: &'a AppServer) -> &'a mio::net::UdpSocket {
+        &srv.sockets[self.0]
+    }
+
+    pub fn get_mut<'a>(&self, srv: &'a mut AppServer) -> &'a mut mio::net::UdpSocket {
+        &mut srv.sockets[self.0]
+    }
+
+    pub fn send_to(&self, srv: &AppServer, buf: &[u8], addr: SocketAddr) -> anyhow::Result<()> {
+        self.get(srv).send_to(buf, addr)?;
+        Ok(())
+    }
+}
+
+/// Index based pointer to a Peer
+#[derive(Debug, Copy, Clone)]
+pub struct AppPeerPtr(pub usize);
+
+impl AppPeerPtr {
+    /// Takes an index based handle and returns the actual peer
+    pub fn lift(p: PeerPtr) -> Self {
+        Self(p.0)
+    }
+
+    /// Returns an index based handle to one Peer
+    pub fn lower(&self) -> PeerPtr {
+        PeerPtr(self.0)
+    }
+
+    pub fn get_app<'a>(&self, srv: &'a AppServer) -> &'a AppPeer {
+        &srv.peers[self.0]
+    }
+
+    pub fn get_app_mut<'a>(&self, srv: &'a mut AppServer) -> &'a mut AppPeer {
+        &mut srv.peers[self.0]
+    }
+}
+
+#[derive(Debug)]
+pub enum AppPollResult {
+    DeleteKey(AppPeerPtr),
+    SendInitiation(AppPeerPtr),
+    SendRetransmission(AppPeerPtr),
+    ReceivedMessage(usize, Endpoint),
+}
+
+#[derive(Debug)]
+pub enum KeyOutputReason {
+    Exchanged,
+    Stale,
+}
+
+/// Represents a communication partner rosenpass may be sending packets to
+///
+/// Generally at the start of Rosenpass either no address or a Hostname is known;
+/// later when we actually start to receive RespHello packages, we know the specific Address
+/// and socket to use with a peer
+#[derive(Debug)]
+pub enum Endpoint {
+    /// Rosenpass supports multiple sockets, so we include the information
+    /// which socket an address can be reached on. This probably does not
+    /// make much of a difference in most setups where two sockets are just
+    /// used to enable dual stack operation; it does make a difference in
+    /// more complex use cases.
+    ///
+    /// For instance it enables using multiple interfaces with overlapping
+    /// ip spaces, such as listening on a private IP network and a public IP
+    /// at the same time. It also would reply on the same port RespHello was
+    /// sent to when listening on multiple ports on the same interface. This
+    /// may be required for some arcane firewall setups.
+    SocketBoundAddress {
+        /// The socket the address can be reached under; this is generally
+        /// determined when we actually receive an RespHello message
+        socket: SocketPtr,
+        /// Just the address
+        addr: SocketAddr,
+    },
+    // A host name or IP address; storing the hostname here instead of an
+    // ip address makes sure that we look up the host name whenever we try
+    // to make a connection; this may be beneficial in some setups where a host-name
+    // at first can not be resolved but becomes resolvable later.
+    Discovery(HostPathDiscoveryEndpoint),
+}
+
+impl Endpoint {
+    /// Start discovery from some addresses
+    pub fn discovery_from_addresses(addresses: Vec<SocketAddr>) -> Self {
+        Endpoint::Discovery(HostPathDiscoveryEndpoint::from_addresses(addresses))
+    }
+
+    /// Start endpoint discovery from a hostname
+    pub fn discovery_from_hostname(hostname: String) -> anyhow::Result<Self> {
+        let host = HostPathDiscoveryEndpoint::lookup(hostname)?;
+        Ok(Endpoint::Discovery(host))
+    }
+
+    // Restart discovery; joining two sources of (potential) addresses
+    //
+    // This is used when the connection to an endpoint is lost in order
+    // to include the addresses specified on the command line and the
+    // address last used in the discovery process
+    pub fn discovery_from_multiple_sources(
+        a: Option<&Endpoint>,
+        b: Option<&Endpoint>,
+    ) -> Option<Self> {
+        let sources = match (a, b) {
+            (Some(e), None) | (None, Some(e)) => e.addresses().iter().chain(&[]),
+            (Some(e1), Some(e2)) => e1.addresses().iter().chain(e2.addresses()),
+            (None, None) => return None,
+        };
+        let lower_size_bound = sources.size_hint().0;
+        let mut dedup = std::collections::HashSet::with_capacity(lower_size_bound);
+        let mut addrs = Vec::with_capacity(lower_size_bound);
+        for a in sources {
+            if dedup.insert(a) {
+                addrs.push(*a);
+            }
+        }
+        Some(Self::discovery_from_addresses(addrs))
+    }
+
+    pub fn send(&self, srv: &AppServer, buf: &[u8]) -> anyhow::Result<()> {
+        use Endpoint::*;
+        match self {
+            SocketBoundAddress { socket, addr } => socket.send_to(srv, buf, *addr),
+            Discovery(host) => host.send_scouting(srv, buf),
+        }
+    }
+
+    fn addresses(&self) -> &[SocketAddr] {
+        use Endpoint::*;
+        match self {
+            SocketBoundAddress { addr, .. } => slice::from_ref(addr),
+            Discovery(host) => host.addresses(),
+        }
+    }
+}
+
+/// Handles host-path discovery
+///
+/// When rosenpass is started, we either know no peer address
+/// or we know a hostname. How to contact this hostname may not
+/// be entirely clear for two reasons:
+///
+/// 1. We have multiple sockets; only a subset of those may be able to contact the host
+/// 2. DNS resolution can return multiple addresses
+///
+/// We could just use the first working socket and the first address returned, but this
+/// may be error prone: Some of the sockets may appear to be able to contact the host,
+/// but the packets will be dropped. Some of the addresses may appear to be reachable
+/// but the packets could be lost.
+///
+/// In contrast to TCP, UDP has no mechanism to ensure packets actually arrive.
+///
+/// To robustly handle host path discovery, we try each socket-ip-combination in a round
+/// robin fashion; the struct stores the offset of the last used combination internally and
+/// and will continue with the next combination on every call.
+///
+/// Retransmission handling will continue normally; i.e. increasing the distance between
+/// retransmissions on every retransmission, until it is long enough to bore a human. Therefor
+/// it is important to avoid having a large number of sockets drop packets not just for efficiency
+/// but to avoid latency issues too.
+///
+// TODO: We might consider adjusting the retransmission handling to account for host-path discovery
+#[derive(Debug)]
+pub struct HostPathDiscoveryEndpoint {
+    scouting_state: Cell<(usize, usize)>, // addr_off, sock_off
+    addresses: Vec<SocketAddr>,
+}
+
+impl HostPathDiscoveryEndpoint {
+    pub fn from_addresses(addresses: Vec<SocketAddr>) -> Self {
+        let scouting_state = Cell::new((0, 0));
+        Self {
+            addresses,
+            scouting_state,
+        }
+    }
+
+    /// Lookup a hostname
+    pub fn lookup(hostname: String) -> anyhow::Result<Self> {
+        Ok(Self {
+            addresses: ToSocketAddrs::to_socket_addrs(&hostname)?.collect(),
+            scouting_state: Cell::new((0, 0)),
+        })
+    }
+
+    pub fn addresses(&self) -> &Vec<SocketAddr> {
+        &self.addresses
+    }
+
+    fn insert_next_scout_offset(&self, srv: &AppServer, addr_no: usize, sock_no: usize) {
+        self.scouting_state.set((
+            (addr_no + 1) % self.addresses.len(),
+            (sock_no + 1) % srv.sockets.len(),
+        ));
+    }
+
+    /// Attempt to reach the host
+    ///
+    /// Will round-robin-try different socket-ip-combinations on each call.
+    pub fn send_scouting(&self, srv: &AppServer, buf: &[u8]) -> anyhow::Result<()> {
+        let (addr_off, sock_off) = self.scouting_state.get();
+
+        let mut addrs = (self.addresses)
+            .iter()
+            .enumerate()
+            .cycle()
+            .skip(addr_off)
+            .take(self.addresses.len());
+        let mut sockets = (srv.sockets)
+            .iter()
+            .enumerate()
+            .cycle()
+            .skip(sock_off)
+            .take(srv.sockets.len());
+
+        for (addr_no, addr) in addrs.by_ref() {
+            for (sock_no, sock) in sockets.by_ref() {
+                let res = sock.send_to(buf, *addr);
+                let err = match res {
+                    Ok(_) => {
+                        self.insert_next_scout_offset(srv, addr_no, sock_no);
+                        return Ok(());
+                    }
+                    Err(e) => e,
+                };
+
+                // TODO: replace this by
+                // e.kind() == io::ErrorKind::NetworkUnreachable
+                // once https://github.com/rust-lang/rust/issues/86442 lands
+                let ignore = err
+                    .to_string()
+                    .starts_with("Address family not supported by protocol");
+                if !ignore {
+                    warn!("Socket #{} refusing to send to {}: ", sock_no, addr);
+                }
+            }
+        }
+
+        bail!("Unable to send message: All sockets returned errors.")
+    }
+}
+
+impl AppServer {
+    pub fn new(
+        sk: SSk,
+        pk: SPk,
+        addrs: Vec<SocketAddr>,
+        verbosity: Verbosity,
+    ) -> anyhow::Result<Self> {
+        // setup mio
+        let mio_poll = mio::Poll::new()?;
+        let events = mio::Events::with_capacity(8);
+
+        // bind each SocketAddr to a socket
+        let maybe_sockets: Result<Vec<_>, _> =
+            addrs.into_iter().map(mio::net::UdpSocket::bind).collect();
+        let mut sockets = maybe_sockets?;
+
+        // When no socket is specified, rosenpass should open one port on all
+        // available interfaces best-effort. Here are the cases how this can possibly go:
+        //
+        // Some operating systems (such as Linux [^linux] and FreeBSD [^freebsd])
+        // using IPv6 sockets to handle IPv4 connections; on these systems
+        // binding to the `[::]:0` address will typically open a dual-stack
+        // socket. Some other systems such as OpenBSD [^openbsd] do not support this feature.
+        //
+        // Dual-stack systems provide a flag to enable or disable this
+        // behavior – the IPV6_V6ONLY flag. OpenBSD supports this flag
+        // read-only. MIO[^mio] provides a way to read this flag but not
+        // to write it.
+        //
+        // - One dual-stack IPv6 socket, if the operating supports dual-stack sockets and
+        //   correctly reports this
+        // - One IPv6 socket and one IPv4 socket if the operating does not support dual stack
+        //   sockets or disables them by default assuming this is also correctly reported
+        // - One IPv6 socket and no IPv4 socket if IPv6 socket is not dual-stack and opening
+        //   the IPv6 socket fails
+        // - One IPv4 socket and no IPv6 socket if opening the IPv6 socket fails
+        // - One dual-stack IPv6 socket and a redundant IPv4 socket if dual-stack sockets are
+        //   supported but the operating system does not correctly report this (specifically,
+        //   if the only_v6() call raises an error)
+        // - Rosenpass exits if no socket could be opened
+        //
+        // [^freebsd]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4&manpath=FreeBSD+6.0-RELEASE
+        // [^openbsd]: https://man.openbsd.org/ip6.4
+        // [^linux]: https://man7.org/linux/man-pages/man7/ipv6.7.html
+        // [^mio]: https://docs.rs/mio/0.8.6/mio/net/struct.UdpSocket.html#method.only_v6
+        if sockets.is_empty() {
+            macro_rules! try_register_socket {
+                ($title:expr, $binding:expr) => {{
+                    let r = mio::net::UdpSocket::bind($binding);
+                    match r {
+                        Ok(sock) => {
+                            sockets.push(sock);
+                            Some(sockets.len() - 1)
+                        }
+                        Err(e) => {
+                            warn!("Could not bind to {} socket: {}", $title, e);
+                            None
+                        }
+                    }
+                }};
+            }
+
+            let v6 = try_register_socket!("IPv6", ipv6_any_binding());
+
+            let need_v4 = match v6.map(|no| sockets[no].only_v6()) {
+                Some(Ok(v)) => v,
+                None => true,
+                Some(Err(e)) => {
+                    warn!("Unable to detect whether the IPv6 socket supports dual-stack operation: {}", e);
+                    true
+                }
+            };
+
+            if need_v4 {
+                try_register_socket!("IPv4", ipv4_any_binding());
+            }
+        }
+
+        if sockets.is_empty() {
+            bail!("No sockets to listen on!")
+        }
+
+        // register all sockets to mio
+        for (i, socket) in sockets.iter_mut().enumerate() {
+            mio_poll
+                .registry()
+                .register(socket, Token(i), Interest::READABLE)?;
+        }
+
+        // TODO use mio::net::UnixStream together with std::os::unix::net::UnixStream for Linux
+
+        Ok(Self {
+            crypt: CryptoServer::new(sk, pk),
+            peers: Vec::new(),
+            verbosity,
+            sockets,
+            events,
+            mio_poll,
+            all_sockets_drained: false,
+        })
+    }
+
+    pub fn verbose(&self) -> bool {
+        matches!(self.verbosity, Verbosity::Verbose)
+    }
+
+    pub fn add_peer(
+        &mut self,
+        psk: Option<SymKey>,
+        pk: SPk,
+        outfile: Option<PathBuf>,
+        outwg: Option<WireguardOut>,
+        hostname: Option<String>,
+    ) -> anyhow::Result<AppPeerPtr> {
+        let PeerPtr(pn) = self.crypt.add_peer(psk, pk)?;
+        assert!(pn == self.peers.len());
+        let initial_endpoint = hostname
+            .map(Endpoint::discovery_from_hostname)
+            .transpose()?;
+        let current_endpoint = None;
+        self.peers.push(AppPeer {
+            outfile,
+            outwg,
+            initial_endpoint,
+            current_endpoint,
+        });
+        Ok(AppPeerPtr(pn))
+    }
+
+    pub fn listen_loop(&mut self) -> anyhow::Result<()> {
+        const INIT_SLEEP: f64 = 0.01;
+        const MAX_FAILURES: i32 = 10;
+        let mut failure_cnt = 0;
+
+        loop {
+            let msgs_processed = 0usize;
+            let err = match self.event_loop() {
+                Ok(()) => return Ok(()),
+                Err(e) => e,
+            };
+
+            // This should not happen…
+            failure_cnt = if msgs_processed > 0 {
+                0
+            } else {
+                failure_cnt + 1
+            };
+            let sleep = INIT_SLEEP * 2.0f64.powf(f64::from(failure_cnt - 1));
+            let tries_left = MAX_FAILURES - (failure_cnt - 1);
+            error!(
+                "unexpected error after processing {} messages: {:?} {}",
+                msgs_processed,
+                err,
+                err.backtrace()
+            );
+            if tries_left > 0 {
+                error!("re-initializing networking in {sleep}! {tries_left} tries left.");
+                std::thread::sleep(self.crypt.timebase.dur(sleep));
+                continue;
+            }
+
+            bail!("too many network failures");
+        }
+    }
+
+    pub fn event_loop(&mut self) -> anyhow::Result<()> {
+        let (mut rx, mut tx) = (MsgBuf::zero(), MsgBuf::zero());
+
+        /// if socket address for peer is known, call closure
+        /// assumes that closure leaves a message in `tx`
+        /// assumes that closure returns the length of message in bytes
+        macro_rules! tx_maybe_with {
+            ($peer:expr, $fn:expr) => {
+                attempt!({
+                    let p = $peer;
+                    if p.get_app(self).endpoint().is_some() {
+                        let len = $fn()?;
+                        let ep: &Endpoint = p.get_app(self).endpoint().unwrap();
+                        ep.send(self, &tx[..len])?;
+                    }
+                    Ok(())
+                })
+            };
+        }
+
+        loop {
+            use crate::protocol::HandleMsgResult;
+            use AppPollResult::*;
+            use KeyOutputReason::*;
+            match self.poll(&mut *rx)? {
+                #[allow(clippy::redundant_closure_call)]
+                SendInitiation(peer) => tx_maybe_with!(peer, || self
+                    .crypt
+                    .initiate_handshake(peer.lower(), &mut *tx))?,
+                #[allow(clippy::redundant_closure_call)]
+                SendRetransmission(peer) => tx_maybe_with!(peer, || self
+                    .crypt
+                    .retransmit_handshake(peer.lower(), &mut *tx))?,
+                DeleteKey(peer) => {
+                    self.output_key(peer, Stale, &SymKey::random())?;
+
+                    // There was a loss of connection apparently; restart host discovery
+                    // starting from the last used address but including all the initially
+                    // specified addresses
+                    // TODO: We could do this preemptively, before any connection loss actually occurs.
+                    let p = peer.get_app_mut(self);
+                    p.current_endpoint = Endpoint::discovery_from_multiple_sources(
+                        p.current_endpoint.as_ref(),
+                        p.initial_endpoint.as_ref(),
+                    );
+                }
+
+                ReceivedMessage(len, endpoint) => {
+                    match self.crypt.handle_msg(&rx[..len], &mut *tx) {
+                        Err(ref e) => {
+                            self.verbose().then(|| {
+                                info!(
+                                    "error processing incoming message from {:?}: {:?} {}",
+                                    endpoint,
+                                    e,
+                                    e.backtrace()
+                                );
+                            });
+                        }
+
+                        Ok(HandleMsgResult {
+                            resp,
+                            exchanged_with,
+                            ..
+                        }) => {
+                            if let Some(len) = resp {
+                                endpoint.send(self, &tx[0..len])?;
+                            }
+
+                            if let Some(p) = exchanged_with {
+                                let ap = AppPeerPtr::lift(p);
+                                ap.get_app_mut(self).current_endpoint = Some(endpoint);
+
+                                // TODO: Maybe we should rather call the key "rosenpass output"?
+                                self.output_key(ap, Exchanged, &self.crypt.osk(p)?)?;
+                            }
+                        }
+                    }
+                }
+            };
+        }
+    }
+
+    pub fn output_key(
+        &self,
+        peer: AppPeerPtr,
+        why: KeyOutputReason,
+        key: &SymKey,
+    ) -> anyhow::Result<()> {
+        let peerid = peer.lower().get(&self.crypt).pidt()?;
+        let ap = peer.get_app(self);
+
+        if self.verbose() {
+            let msg = match why {
+                KeyOutputReason::Exchanged => "Exchanged key with peer",
+                KeyOutputReason::Stale => "Erasing outdated key from peer",
+            };
+            info!("{} {}", msg, fmt_b64(&*peerid));
+        }
+
+        if let Some(of) = ap.outfile.as_ref() {
+            // This might leave some fragments of the secret on the stack;
+            // in practice this is likely not a problem because the stack likely
+            // will be overwritten by something else soon but this is not exactly
+            // guaranteed. It would be possible to remedy this, but since the secret
+            // data will linger in the linux page cache anyways with the current
+            // implementation, going to great length to erase the secret here is
+            // not worth it right now.
+            b64_writer(fopen_w(of)?).write_all(key.secret())?;
+            let why = match why {
+                KeyOutputReason::Exchanged => "exchanged",
+                KeyOutputReason::Stale => "stale",
+            };
+
+            // this is intentionally writing to stdout instead of stderr, because
+            // it is meant to allow external detection of a successful key-exchange
+            println!(
+                "output-key peer {} key-file {of:?} {why}",
+                fmt_b64(&*peerid)
+            );
+        }
+
+        if let Some(owg) = ap.outwg.as_ref() {
+            let mut child = Command::new("wg")
+                .arg("set")
+                .arg(&owg.dev)
+                .arg("peer")
+                .arg(&owg.pk)
+                .arg("preshared-key")
+                .arg("/dev/stdin")
+                .stdin(Stdio::piped())
+                .args(&owg.extra_params)
+                .spawn()?;
+            b64_writer(child.stdin.take().unwrap()).write_all(key.secret())?;
+
+            thread::spawn(move || {
+                let status = child.wait();
+
+                if let Ok(status) = status {
+                    if status.success() {
+                        debug!("successfully passed psk to wg")
+                    } else {
+                        error!("could not pass psk to wg {:?}", status)
+                    }
+                } else {
+                    error!("wait failed: {:?}", status)
+                }
+            });
+        }
+
+        Ok(())
+    }
+
+    pub fn poll(&mut self, rx_buf: &mut [u8]) -> anyhow::Result<AppPollResult> {
+        use crate::protocol::PollResult as C;
+        use AppPollResult as A;
+        loop {
+            return Ok(match self.crypt.poll()? {
+                C::DeleteKey(PeerPtr(no)) => A::DeleteKey(AppPeerPtr(no)),
+                C::SendInitiation(PeerPtr(no)) => A::SendInitiation(AppPeerPtr(no)),
+                C::SendRetransmission(PeerPtr(no)) => A::SendRetransmission(AppPeerPtr(no)),
+                C::Sleep(timeout) => match self.try_recv(rx_buf, timeout)? {
+                    Some((len, addr)) => A::ReceivedMessage(len, addr),
+                    None => continue,
+                },
+            });
+        }
+    }
+
+    /// Tries to receive a new message
+    ///
+    /// - might wait for an duration up to `timeout`
+    /// - returns immediately if an error occurs
+    /// - returns immediately if a new message is received
+    pub fn try_recv(
+        &mut self,
+        buf: &mut [u8],
+        timeout: Timing,
+    ) -> anyhow::Result<Option<(usize, Endpoint)>> {
+        let timeout = Duration::from_secs_f64(timeout);
+
+        // if there is no time to wait on IO, well, then, lets not waste any time!
+        if timeout.is_zero() {
+            return Ok(None);
+        }
+
+        // NOTE when using mio::Poll, there are some particularities (taken from
+        // https://docs.rs/mio/latest/mio/struct.Poll.html):
+        //
+        // - poll() might return readiness, even if nothing is ready
+        // - in this case, a WouldBlock error is returned from actual IO operations
+        // - after receiving readiness for a source, it must be drained until a WouldBlock
+        //   is received
+        //
+        // This would usually require us to maintain the drainage status of each socket;
+        // a socket would only become drained when it returned WouldBlock and only
+        // non-drained when receiving a readiness event from mio for it. Then, only the
+        // ready sockets should be worked on, ideally without requiring an O(n) search
+        // through all sockets for checking their drained status. However, our use-case
+        // is primarily heaving one or two sockets (if IPv4 and IPv6 IF_ANY listen is
+        // desired on a non-dual-stack OS), thus just checking every socket after any
+        // readiness event seems to be good enough™ for now.
+
+        // only poll if we drained all sockets before
+        if self.all_sockets_drained {
+            self.mio_poll.poll(&mut self.events, Some(timeout))?;
+        }
+
+        let mut would_block_count = 0;
+        for (sock_no, socket) in self.sockets.iter_mut().enumerate() {
+            match socket.recv_from(buf) {
+                Ok((n, addr)) => {
+                    // at least one socket was not drained...
+                    self.all_sockets_drained = false;
+                    return Ok(Some((
+                        n,
+                        Endpoint::SocketBoundAddress {
+                            socket: SocketPtr(sock_no),
+                            addr,
+                        },
+                    )));
+                }
+                Err(e) if e.kind() == ErrorKind::WouldBlock => {
+                    would_block_count += 1;
+                }
+                // TODO if one socket continuously returns an error, then we never poll, thus we never wait for a timeout, thus we have a spin-lock
+                Err(e) => return Err(e.into()),
+            }
+        }
+
+        // if each socket returned WouldBlock, then we drained them all at least once indeed
+        self.all_sockets_drained = would_block_count == self.sockets.len();
+
+        Ok(None)
+    }
+}

rosenpass/src/cli.rs

@@ -0,0 +1,295 @@
+use anyhow::{bail, ensure};
+use clap::Parser;
+use rosenpass_cipher_traits::Kem;
+use rosenpass_ciphers::kem::StaticKem;
+use rosenpass_secret_memory::file::StoreSecret;
+use rosenpass_util::file::{LoadValue, LoadValueB64};
+use std::path::PathBuf;
+
+use crate::app_server;
+use crate::app_server::AppServer;
+use crate::protocol::{SPk, SSk, SymKey};
+
+use super::config;
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about)]
+pub enum Cli {
+    /// Start Rosenpass in server mode and carry on with the key exchange
+    ///
+    /// This will parse the configuration file and perform the key exchange
+    /// with the specified peers. If a peer's endpoint is specified, this
+    /// Rosenpass instance will try to initiate a key exchange with the peer,
+    /// otherwise only initiation attempts from the peer will be responded to.
+    ExchangeConfig { config_file: PathBuf },
+
+    /// Start in daemon mode, performing key exchanges
+    ///
+    /// The configuration is read from the command line. The `peer` token
+    /// always separates multiple peers, e. g. if the token `peer` appears
+    /// in the WIREGUARD_EXTRA_ARGS it is not put into the WireGuard arguments
+    /// but instead a new peer is created.
+    /* Explanation: `first_arg` and `rest_of_args` are combined into one
+     * `Vec<String>`. They are only used to trick clap into displaying some
+     * guidance on the CLI usage.
+     */
+    #[allow(rustdoc::broken_intra_doc_links)]
+    #[allow(rustdoc::invalid_html_tags)]
+    Exchange {
+        /// public-key <PATH> secret-key <PATH> [listen <ADDR>:<PORT>]... [verbose]
+        #[clap(value_name = "OWN_CONFIG")]
+        first_arg: String,
+
+        /// peer public-key <PATH> [ENDPOINT] [PSK] [OUTFILE] [WG]
+        ///
+        /// ENDPOINT := endpoint <HOST/IP>:<PORT>
+        ///
+        /// PSK := preshared-key <PATH>
+        ///
+        /// OUTFILE := outfile <PATH>
+        ///
+        /// WG := wireguard <WIREGUARD_DEV> <WIREGUARD_PEER> [WIREGUARD_EXTRA_ARGS]...
+        #[clap(value_name = "PEERS")]
+        rest_of_args: Vec<String>,
+
+        /// Save the parsed configuration to a file before starting the daemon
+        #[clap(short, long)]
+        config_file: Option<PathBuf>,
+    },
+
+    /// Generate a demo config file
+    GenConfig {
+        config_file: PathBuf,
+
+        /// Forcefully overwrite existing config file
+        #[clap(short, long)]
+        force: bool,
+    },
+
+    /// Generate the keys mentioned in a configFile
+    ///
+    /// Generates secret- & public-key to their destination. If a config file
+    /// is provided then the key file destination is taken from there.
+    /// Otherwise the
+    GenKeys {
+        config_file: Option<PathBuf>,
+
+        /// where to write public-key to
+        #[clap(short, long)]
+        public_key: Option<PathBuf>,
+
+        /// where to write secret-key to
+        #[clap(short, long)]
+        secret_key: Option<PathBuf>,
+
+        /// Forcefully overwrite public- & secret-key file
+        #[clap(short, long)]
+        force: bool,
+    },
+
+    /// Deprecated - use gen-keys instead
+    #[allow(rustdoc::broken_intra_doc_links)]
+    #[allow(rustdoc::invalid_html_tags)]
+    Keygen {
+        // NOTE yes, the legacy keygen argument initially really accepted "privet-key", not "secret-key"!
+        /// public-key <PATH> private-key <PATH>
+        args: Vec<String>,
+    },
+
+    /// Validate a configuration
+    Validate { config_files: Vec<PathBuf> },
+
+    /// Show the rosenpass manpage
+    // TODO make this the default, but only after the manpage has been adjusted once the CLI stabilizes
+    Man,
+}
+
+impl Cli {
+    pub fn run() -> anyhow::Result<()> {
+        let cli = Self::parse();
+
+        use Cli::*;
+        match cli {
+            Man => {
+                let man_cmd = std::process::Command::new("man")
+                    .args(["1", "rosenpass"])
+                    .status();
+
+                if !(man_cmd.is_ok() && man_cmd.unwrap().success()) {
+                    println!(include_str!(env!("ROSENPASS_MAN")));
+                }
+            }
+            GenConfig { config_file, force } => {
+                ensure!(
+                    force || !config_file.exists(),
+                    "config file {config_file:?} already exists"
+                );
+
+                config::Rosenpass::example_config().store(config_file)?;
+            }
+
+            // Deprecated - use gen-keys instead
+            Keygen { args } => {
+                log::warn!("The 'keygen' command is deprecated. Please use the 'gen-keys' command instead.");
+
+                let mut public_key: Option<PathBuf> = None;
+                let mut secret_key: Option<PathBuf> = None;
+
+                // Manual arg parsing, since clap wants to prefix flags with "--"
+                let mut args = args.into_iter();
+                loop {
+                    match (args.next().as_ref().map(String::as_str), args.next()) {
+                        (Some("private-key"), Some(opt)) | (Some("secret-key"), Some(opt)) => {
+                            secret_key = Some(opt.into());
+                        }
+                        (Some("public-key"), Some(opt)) => {
+                            public_key = Some(opt.into());
+                        }
+                        (Some(flag), _) => {
+                            bail!("Unknown option `{}`", flag);
+                        }
+                        (_, _) => break,
+                    };
+                }
+
+                if secret_key.is_none() {
+                    bail!("private-key is required");
+                }
+                if public_key.is_none() {
+                    bail!("public-key is required");
+                }
+
+                generate_and_save_keypair(secret_key.unwrap(), public_key.unwrap())?;
+            }
+
+            GenKeys {
+                config_file,
+                public_key,
+                secret_key,
+                force,
+            } => {
+                // figure out where the key file is specified, in the config file or directly as flag?
+                let (pkf, skf) = match (config_file, public_key, secret_key) {
+                    (Some(config_file), _, _) => {
+                        ensure!(
+                            config_file.exists(),
+                            "config file {config_file:?} does not exist"
+                        );
+
+                        let config = config::Rosenpass::load(config_file)?;
+
+                        (config.public_key, config.secret_key)
+                    }
+                    (_, Some(pkf), Some(skf)) => (pkf, skf),
+                    _ => {
+                        bail!("either a config-file or both public-key and secret-key file are required")
+                    }
+                };
+
+                // check that we are not overriding something unintentionally
+                let mut problems = vec![];
+                if !force && pkf.is_file() {
+                    problems.push(format!(
+                        "public-key file {pkf:?} exist, refusing to overwrite it"
+                    ));
+                }
+                if !force && skf.is_file() {
+                    problems.push(format!(
+                        "secret-key file {skf:?} exist, refusing to overwrite it"
+                    ));
+                }
+                if !problems.is_empty() {
+                    bail!(problems.join("\n"));
+                }
+
+                // generate the keys and store them in files
+                generate_and_save_keypair(skf, pkf)?;
+            }
+
+            ExchangeConfig { config_file } => {
+                ensure!(
+                    config_file.exists(),
+                    "config file '{config_file:?}' does not exist"
+                );
+
+                let config = config::Rosenpass::load(config_file)?;
+                config.validate()?;
+                Self::event_loop(config)?;
+            }
+
+            Exchange {
+                first_arg,
+                mut rest_of_args,
+                config_file,
+            } => {
+                rest_of_args.insert(0, first_arg);
+                let args = rest_of_args;
+                let mut config = config::Rosenpass::parse_args(args)?;
+
+                if let Some(p) = config_file {
+                    config.store(&p)?;
+                    config.config_file_path = p;
+                }
+                config.validate()?;
+                Self::event_loop(config)?;
+            }
+
+            Validate { config_files } => {
+                for file in config_files {
+                    match config::Rosenpass::load(&file) {
+                        Ok(config) => {
+                            eprintln!("{file:?} is valid TOML and conforms to the expected schema");
+                            match config.validate() {
+                                Ok(_) => eprintln!("{file:?} is passed all logical checks"),
+                                Err(_) => eprintln!("{file:?} contains logical errors"),
+                            }
+                        }
+                        Err(e) => eprintln!("{file:?} is not valid: {e}"),
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    fn event_loop(config: config::Rosenpass) -> anyhow::Result<()> {
+        // load own keys
+        let sk = SSk::load(&config.secret_key)?;
+        let pk = SPk::load(&config.public_key)?;
+
+        // start an application server
+        let mut srv = std::boxed::Box::<AppServer>::new(AppServer::new(
+            sk,
+            pk,
+            config.listen,
+            config.verbosity,
+        )?);
+
+        for cfg_peer in config.peers {
+            srv.add_peer(
+                // psk, pk, outfile, outwg, tx_addr
+                cfg_peer.pre_shared_key.map(SymKey::load_b64).transpose()?,
+                SPk::load(&cfg_peer.public_key)?,
+                cfg_peer.key_out,
+                cfg_peer.wg.map(|cfg| app_server::WireguardOut {
+                    dev: cfg.device,
+                    pk: cfg.peer,
+                    extra_params: cfg.extra_params,
+                }),
+                cfg_peer.endpoint.clone(),
+            )?;
+        }
+
+        srv.event_loop()
+    }
+}
+
+/// generate secret and public keys, store in files according to the paths passed as arguments
+fn generate_and_save_keypair(secret_key: PathBuf, public_key: PathBuf) -> anyhow::Result<()> {
+    let mut ssk = crate::protocol::SSk::random();
+    let mut spk = crate::protocol::SPk::random();
+    StaticKem::keygen(ssk.secret_mut(), spk.secret_mut())?;
+    ssk.store_secret(secret_key)?;
+    spk.store_secret(public_key)
+}

rosenpass/src/config.rs

@@ -0,0 +1,444 @@
+use std::{
+    collections::HashSet,
+    fs,
+    io::Write,
+    net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs},
+    path::{Path, PathBuf},
+};
+
+use anyhow::{bail, ensure};
+use rosenpass_util::file::fopen_w;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Rosenpass {
+    pub public_key: PathBuf,
+
+    pub secret_key: PathBuf,
+
+    pub listen: Vec<SocketAddr>,
+
+    #[serde(default)]
+    pub verbosity: Verbosity,
+    pub peers: Vec<RosenpassPeer>,
+
+    #[serde(skip)]
+    pub config_file_path: PathBuf,
+}
+
+#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum Verbosity {
+    Quiet,
+    Verbose,
+}
+
+#[derive(Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RosenpassPeer {
+    pub public_key: PathBuf,
+    pub endpoint: Option<String>,
+    pub pre_shared_key: Option<PathBuf>,
+
+    #[serde(default)]
+    pub key_out: Option<PathBuf>,
+
+    // TODO make this field only available on binary builds, not on library builds
+    #[serde(flatten)]
+    pub wg: Option<WireGuard>,
+}
+
+#[derive(Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+pub struct WireGuard {
+    pub device: String,
+    pub peer: String,
+
+    #[serde(default)]
+    pub extra_params: Vec<String>,
+}
+
+impl Rosenpass {
+    /// Load a config file from a file path
+    ///
+    /// no validation is conducted
+    pub fn load<P: AsRef<Path>>(p: P) -> anyhow::Result<Self> {
+        let mut config: Self = toml::from_str(&fs::read_to_string(&p)?)?;
+
+        config.config_file_path = p.as_ref().to_owned();
+        Ok(config)
+    }
+
+    /// Write a config to a file
+    pub fn store<P: AsRef<Path>>(&self, p: P) -> anyhow::Result<()> {
+        let serialized_config =
+            toml::to_string_pretty(&self).expect("unable to serialize the default config");
+        fs::write(p, serialized_config)?;
+        Ok(())
+    }
+
+    /// Commit the configuration to where it came from, overwriting the original file
+    pub fn commit(&self) -> anyhow::Result<()> {
+        let mut f = fopen_w(&self.config_file_path)?;
+        f.write_all(toml::to_string_pretty(&self)?.as_bytes())?;
+
+        self.store(&self.config_file_path)
+    }
+
+    /// Validate a configuration
+    pub fn validate(&self) -> anyhow::Result<()> {
+        // check the public-key file exists
+        ensure!(
+            self.public_key.is_file(),
+            "public-key file {:?} does not exist",
+            self.public_key
+        );
+
+        // check the secret-key file exists
+        ensure!(
+            self.secret_key.is_file(),
+            "secret-key file {:?} does not exist",
+            self.secret_key
+        );
+
+        for (i, peer) in self.peers.iter().enumerate() {
+            // check peer's public-key file exists
+            ensure!(
+                peer.public_key.is_file(),
+                "peer {i} public-key file {:?} does not exist",
+                peer.public_key
+            );
+
+            // check endpoint is usable
+            if let Some(addr) = peer.endpoint.as_ref() {
+                ensure!(
+                    addr.to_socket_addrs().is_ok(),
+                    "peer {i} endpoint {} can not be parsed to a socket address",
+                    addr
+                );
+            }
+
+            // TODO warn if neither out_key nor exchange_command is defined
+        }
+
+        Ok(())
+    }
+
+    /// Creates a new configuration
+    pub fn new<P1: AsRef<Path>, P2: AsRef<Path>>(public_key: P1, secret_key: P2) -> Self {
+        Self {
+            public_key: PathBuf::from(public_key.as_ref()),
+            secret_key: PathBuf::from(secret_key.as_ref()),
+            listen: vec![],
+            verbosity: Verbosity::Quiet,
+            peers: vec![],
+            config_file_path: PathBuf::new(),
+        }
+    }
+
+    /// Add IPv4 __and__ IPv6 IF_ANY address to the listen interfaces
+    pub fn add_if_any(&mut self, port: u16) {
+        let ipv4_any = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), port));
+        let ipv6_any = SocketAddr::V6(SocketAddrV6::new(
+            Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0),
+            port,
+            0,
+            0,
+        ));
+        self.listen.push(ipv4_any);
+        self.listen.push(ipv6_any);
+    }
+
+    /// from chaotic args
+    /// Quest: the grammar is undecideable, what do we do here?
+    pub fn parse_args(args: Vec<String>) -> anyhow::Result<Self> {
+        let mut config = Self::new("", "");
+
+        #[derive(Debug, Hash, PartialEq, Eq)]
+        enum State {
+            Own,
+            OwnPublicKey,
+            OwnSecretKey,
+            OwnListen,
+            Peer,
+            PeerPsk,
+            PeerPublicKey,
+            PeerEndpoint,
+            PeerOutfile,
+            PeerWireguardDev,
+            PeerWireguardPeer,
+            PeerWireguardExtraArgs,
+        }
+
+        let mut already_set = HashSet::new();
+
+        // TODO idea: use config.peers.len() to give index of peer with conflicting argument
+        use State::*;
+        let mut state = Own;
+        let mut current_peer = None;
+        let p_exists = "a peer should exist by now";
+        let wg_exists = "a peer wireguard should exist by now";
+        for arg in args {
+            state = match (state, arg.as_str(), &mut current_peer) {
+                (Own, "public-key", None) => OwnPublicKey,
+                (Own, "secret-key", None) => OwnSecretKey,
+                (Own, "private-key", None) => {
+                    log::warn!(
+                        "the private-key argument is deprecated, please use secret-key instead"
+                    );
+                    OwnSecretKey
+                }
+                (Own, "listen", None) => OwnListen,
+                (Own, "verbose", None) => {
+                    config.verbosity = Verbosity::Verbose;
+                    Own
+                }
+                (Own, "peer", None) => {
+                    ensure!(
+                        already_set.contains(&OwnPublicKey),
+                        "public-key file must be set"
+                    );
+                    ensure!(
+                        already_set.contains(&OwnSecretKey),
+                        "secret-key file must be set"
+                    );
+
+                    already_set.clear();
+                    current_peer = Some(RosenpassPeer::default());
+
+                    Peer
+                }
+                (OwnPublicKey, pk, None) => {
+                    ensure!(
+                        already_set.insert(OwnPublicKey),
+                        "public-key was already set"
+                    );
+                    config.public_key = pk.into();
+                    Own
+                }
+                (OwnSecretKey, sk, None) => {
+                    ensure!(
+                        already_set.insert(OwnSecretKey),
+                        "secret-key was already set"
+                    );
+                    config.secret_key = sk.into();
+                    Own
+                }
+                (OwnListen, l, None) => {
+                    already_set.insert(OwnListen); // multiple listen directives are allowed
+                    for socket_addr in l.to_socket_addrs()? {
+                        config.listen.push(socket_addr);
+                    }
+
+                    Own
+                }
+                (Peer | PeerWireguardExtraArgs, "peer", maybe_peer @ Some(_)) => {
+                    // TODO check current peer
+                    // commit current peer, create a new one
+                    config.peers.push(maybe_peer.take().expect(p_exists));
+
+                    already_set.clear();
+                    current_peer = Some(RosenpassPeer::default());
+
+                    Peer
+                }
+                (Peer, "public-key", Some(_)) => PeerPublicKey,
+                (Peer, "endpoint", Some(_)) => PeerEndpoint,
+                (Peer, "preshared-key", Some(_)) => PeerPsk,
+                (Peer, "outfile", Some(_)) => PeerOutfile,
+                (Peer, "wireguard", Some(_)) => PeerWireguardDev,
+                (PeerPublicKey, pk, Some(peer)) => {
+                    ensure!(
+                        already_set.insert(PeerPublicKey),
+                        "public-key was already set"
+                    );
+                    peer.public_key = pk.into();
+                    Peer
+                }
+                (PeerEndpoint, e, Some(peer)) => {
+                    ensure!(already_set.insert(PeerEndpoint), "endpoint was already set");
+                    peer.endpoint = Some(e.to_owned());
+                    Peer
+                }
+                (PeerPsk, psk, Some(peer)) => {
+                    ensure!(already_set.insert(PeerEndpoint), "peer psk was already set");
+                    peer.pre_shared_key = Some(psk.into());
+                    Peer
+                }
+                (PeerOutfile, of, Some(peer)) => {
+                    ensure!(
+                        already_set.insert(PeerOutfile),
+                        "peer outfile was already set"
+                    );
+                    peer.key_out = Some(of.into());
+                    Peer
+                }
+                (PeerWireguardDev, dev, Some(peer)) => {
+                    ensure!(
+                        already_set.insert(PeerWireguardDev),
+                        "peer wireguard-dev was already set"
+                    );
+                    assert!(peer.wg.is_none());
+                    peer.wg = Some(WireGuard {
+                        device: dev.to_string(),
+                        ..Default::default()
+                    });
+
+                    PeerWireguardPeer
+                }
+                (PeerWireguardPeer, p, Some(peer)) => {
+                    ensure!(
+                        already_set.insert(PeerWireguardPeer),
+                        "peer wireguard-peer was already set"
+                    );
+                    peer.wg.as_mut().expect(wg_exists).peer = p.to_string();
+                    PeerWireguardExtraArgs
+                }
+                (PeerWireguardExtraArgs, arg, Some(peer)) => {
+                    peer.wg
+                        .as_mut()
+                        .expect(wg_exists)
+                        .extra_params
+                        .push(arg.to_string());
+                    PeerWireguardExtraArgs
+                }
+
+                // error cases
+                (Own, x, None) => {
+                    bail!("unrecognised argument {x}");
+                }
+                (Own | OwnPublicKey | OwnSecretKey | OwnListen, _, Some(_)) => {
+                    panic!("current_peer is not None while in Own* state, this must never happen")
+                }
+
+                (State::Peer, arg, Some(_)) => {
+                    bail!("unrecongnised argument {arg}");
+                }
+                (
+                    Peer
+                    | PeerEndpoint
+                    | PeerOutfile
+                    | PeerPublicKey
+                    | PeerPsk
+                    | PeerWireguardDev
+                    | PeerWireguardPeer
+                    | PeerWireguardExtraArgs,
+                    _,
+                    None,
+                ) => {
+                    panic!("got peer options but no peer was created")
+                }
+            };
+        }
+
+        if let Some(p) = current_peer {
+            // TODO ensure peer is propagated with sufficient information
+            config.peers.push(p);
+        }
+
+        Ok(config)
+    }
+}
+
+impl Rosenpass {
+    /// Generate an example configuration
+    pub fn example_config() -> Self {
+        let peer = RosenpassPeer {
+            public_key: "/path/to/rp-peer-public-key".into(),
+            endpoint: Some("my-peer.test:9999".into()),
+            key_out: Some("/path/to/rp-key-out.txt".into()),
+            pre_shared_key: Some("additional pre shared key".into()),
+            wg: Some(WireGuard {
+                device: "wirgeguard device e.g. wg0".into(),
+                peer: "wireguard public key".into(),
+                extra_params: vec!["passed to".into(), "wg set".into()],
+            }),
+        };
+
+        Self {
+            public_key: "/path/to/rp-public-key".into(),
+            secret_key: "/path/to/rp-secret-key".into(),
+            peers: vec![peer],
+            ..Self::new("", "")
+        }
+    }
+}
+
+impl Default for Verbosity {
+    fn default() -> Self {
+        Self::Quiet
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use std::net::IpAddr;
+
+    use super::*;
+
+    fn split_str(s: &str) -> Vec<String> {
+        s.split(" ").map(|s| s.to_string()).collect()
+    }
+
+    #[test]
+    fn test_simple_cli_parse() {
+        let args = split_str(
+            "public-key /my/public-key secret-key /my/secret-key verbose \
+                listen 0.0.0.0:9999 peer public-key /peer/public-key endpoint \
+                peer.test:9999 outfile /peer/rp-out",
+        );
+
+        let config = Rosenpass::parse_args(args).unwrap();
+
+        assert_eq!(config.public_key, PathBuf::from("/my/public-key"));
+        assert_eq!(config.secret_key, PathBuf::from("/my/secret-key"));
+        assert_eq!(config.verbosity, Verbosity::Verbose);
+        assert_eq!(
+            &config.listen,
+            &vec![SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 9999)]
+        );
+        assert_eq!(
+            config.peers,
+            vec![RosenpassPeer {
+                public_key: PathBuf::from("/peer/public-key"),
+                endpoint: Some("peer.test:9999".into()),
+                pre_shared_key: None,
+                key_out: Some(PathBuf::from("/peer/rp-out")),
+                ..Default::default()
+            }]
+        )
+    }
+
+    #[test]
+    fn test_cli_parse_multiple_peers() {
+        let args = split_str(
+            "public-key /my/public-key secret-key /my/secret-key verbose \
+                peer public-key /peer-a/public-key endpoint \
+                peer.test:9999 outfile /peer-a/rp-out \
+                peer public-key /peer-b/public-key outfile /peer-b/rp-out",
+        );
+
+        let config = Rosenpass::parse_args(args).unwrap();
+
+        assert_eq!(config.public_key, PathBuf::from("/my/public-key"));
+        assert_eq!(config.secret_key, PathBuf::from("/my/secret-key"));
+        assert_eq!(config.verbosity, Verbosity::Verbose);
+        assert!(&config.listen.is_empty());
+        assert_eq!(
+            config.peers,
+            vec![
+                RosenpassPeer {
+                    public_key: PathBuf::from("/peer-a/public-key"),
+                    endpoint: Some("peer.test:9999".into()),
+                    pre_shared_key: None,
+                    key_out: Some(PathBuf::from("/peer-a/rp-out")),
+                    ..Default::default()
+                },
+                RosenpassPeer {
+                    public_key: PathBuf::from("/peer-b/public-key"),
+                    endpoint: None,
+                    pre_shared_key: None,
+                    key_out: Some(PathBuf::from("/peer-b/rp-out")),
+                    ..Default::default()
+                }
+            ]
+        )
+    }
+}

rosenpass/src/hash_domains.rs

@@ -0,0 +1,46 @@
+//! Pseudo Random Functions (PRFs) with a tree-like label scheme which
+//! ensures their uniqueness
+
+use anyhow::Result;
+use rosenpass_ciphers::{hash_domain::HashDomain, KEY_LEN};
+
+// TODO Use labels that can serve as identifiers
+macro_rules! hash_domain_ns {
+    ($base:ident, $name:ident, $($lbl:expr),* ) => {
+        pub fn $name() -> Result<HashDomain> {
+            let t = $base()?;
+            $( let t = t.mix($lbl.as_bytes())?; )*
+            Ok(t)
+        }
+    }
+}
+
+macro_rules! hash_domain {
+    ($base:ident, $name:ident, $($lbl:expr),* ) => {
+        pub fn $name() -> Result<[u8; KEY_LEN]> {
+            let t = $base()?;
+            $( let t = t.mix($lbl.as_bytes())?; )*
+            Ok(t.into_value())
+        }
+    }
+}
+
+pub fn protocol() -> Result<HashDomain> {
+    HashDomain::zero().mix("Rosenpass v1 mceliece460896 Kyber512 ChaChaPoly1305 BLAKE2s".as_bytes())
+}
+
+hash_domain_ns!(protocol, mac, "mac");
+hash_domain_ns!(protocol, cookie, "cookie");
+hash_domain_ns!(protocol, peerid, "peer id");
+hash_domain_ns!(protocol, biscuit_ad, "biscuit additional data");
+hash_domain_ns!(protocol, ckinit, "chaining key init");
+hash_domain_ns!(protocol, _ckextract, "chaining key extract");
+
+hash_domain!(_ckextract, mix, "mix");
+hash_domain!(_ckextract, hs_enc, "handshake encryption");
+hash_domain!(_ckextract, ini_enc, "initiator handshake encryption");
+hash_domain!(_ckextract, res_enc, "responder handshake encryption");
+
+hash_domain_ns!(_ckextract, _user, "user");
+hash_domain_ns!(_user, _rp, "rosenpass.eu");
+hash_domain!(_rp, osk, "wireguard psk");

rosenpass/src/lib.rs

@@ -0,0 +1,24 @@
+use rosenpass_lenses::LenseError;
+
+pub mod app_server;
+pub mod cli;
+pub mod config;
+pub mod hash_domains;
+pub mod msgs;
+pub mod protocol;
+
+#[derive(thiserror::Error, Debug)]
+pub enum RosenpassError {
+    #[error("buffer size mismatch")]
+    BufferSizeMismatch,
+    #[error("invalid message type")]
+    InvalidMessageType(u8),
+}
+
+impl From<LenseError> for RosenpassError {
+    fn from(value: LenseError) -> Self {
+        match value {
+            LenseError::BufferSizeMismatch => RosenpassError::BufferSizeMismatch,
+        }
+    }
+}

rosenpass/src/main.rs

@@ -0,0 +1,23 @@
+use log::error;
+use rosenpass::cli::Cli;
+use rosenpass_util::attempt;
+use std::process::exit;
+
+/// Catches errors, prints them through the logger, then exits
+pub fn main() {
+    // default to displaying warning and error log messages only
+    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("warn")).init();
+
+    let res = attempt!({
+        rosenpass_sodium::init()?;
+        Cli::run()
+    });
+
+    match res {
+        Ok(_) => {}
+        Err(e) => {
+            error!("{e}");
+            exit(1);
+        }
+    }
+}

rosenpass/src/msgs.rs

@@ -0,0 +1,208 @@
+//! Data structures representing the messages going over the wire
+//!
+//! This module contains de-/serialization of the protocol's messages. Thats kind
+//! of a lie, since no actual ser/de happens. Instead, the structures offer views
+//! into mutable byte slices (`&mut [u8]`), allowing to modify the fields of an
+//! always serialized instance of the data in question. This is closely related
+//! to the concept of lenses in function programming; more on that here:
+//! [https://sinusoid.es/misc/lager/lenses.pdf](https://sinusoid.es/misc/lager/lenses.pdf)
+//!
+//! # Example
+//!
+//! The following example uses the [`lense` macro](rosenpass_lenses::lense) to create a lense that
+//! might be useful when dealing with UDP headers.
+//!
+//! ```
+//! use rosenpass_lenses::{lense, LenseView};
+//! use rosenpass::RosenpassError;
+//! # fn main() -> Result<(), RosenpassError> {
+//!
+//! lense! {UdpDatagramHeader :=
+//!     source_port: 2,
+//!     dest_port: 2,
+//!     length: 2,
+//!     checksum: 2
+//! }
+//!
+//! let mut buf = [0u8; 8];
+//!
+//! // read-only lense, no check of size:
+//! let lense = UdpDatagramHeader(&buf);
+//! assert_eq!(lense.checksum(), &[0, 0]);
+//!
+//! // mutable lense, runtime check of size
+//! let mut lense = buf.as_mut().udp_datagram_header()?;
+//! lense.source_port_mut().copy_from_slice(&53u16.to_be_bytes()); // some DNS, anyone?
+//!
+//! // the original buffer is still available
+//! assert_eq!(buf, [0, 53, 0, 0, 0, 0, 0, 0]);
+//!
+//! // read-only lense, runtime check of size
+//! let lense = buf.as_ref().udp_datagram_header()?;
+//! assert_eq!(lense.source_port(), &[0, 53]);
+//! # Ok(())
+//! # }
+//! ```
+
+use super::RosenpassError;
+use rosenpass_cipher_traits::Kem;
+use rosenpass_ciphers::kem::{EphemeralKem, StaticKem};
+use rosenpass_ciphers::{aead, xaead, KEY_LEN};
+use rosenpass_lenses::{lense, LenseView};
+
+// Macro magic ////////////////////////////////////////////////////////////////
+
+lense! { Envelope<M> :=
+    /// [MsgType] of this message
+    msg_type: 1,
+    /// Reserved for future use
+    reserved: 3,
+    /// The actual Paylod
+    payload: M::LEN,
+    /// Message Authentication Code (mac) over all bytes until (exclusive)
+    /// `mac` itself
+    mac: 16,
+    /// Currently unused, TODO: do something with this
+    cookie: 16
+}
+
+lense! { InitHello :=
+    /// Randomly generated connection id
+    sidi: 4,
+    /// Kyber 512 Ephemeral Public Key
+    epki: EphemeralKem::PK_LEN,
+    /// Classic McEliece Ciphertext
+    sctr: StaticKem::CT_LEN,
+    /// Encryped: 16 byte hash of McEliece initiator static key
+    pidic: aead::TAG_LEN + 32,
+    /// Encrypted TAI64N Time Stamp (against replay attacks)
+    auth: aead::TAG_LEN
+}
+
+lense! { RespHello :=
+    /// Randomly generated connection id
+    sidr: 4,
+    /// Copied from InitHello
+    sidi: 4,
+    /// Kyber 512 Ephemeral Ciphertext
+    ecti: EphemeralKem::CT_LEN,
+    /// Classic McEliece Ciphertext
+    scti: StaticKem::CT_LEN,
+    /// Empty encrypted message (just an auth tag)
+    auth: aead::TAG_LEN,
+    /// Responders handshake state in encrypted form
+    biscuit: BISCUIT_CT_LEN
+}
+
+lense! { InitConf :=
+    /// Copied from InitHello
+    sidi: 4,
+    /// Copied from RespHello
+    sidr: 4,
+    /// Responders handshake state in encrypted form
+    biscuit: BISCUIT_CT_LEN,
+    /// Empty encrypted message (just an auth tag)
+    auth: aead::TAG_LEN
+}
+
+lense! { EmptyData :=
+    /// Copied from RespHello
+    sid: 4,
+    /// Nonce
+    ctr: 8,
+    /// Empty encrypted message (just an auth tag)
+    auth: aead::TAG_LEN
+}
+
+lense! { Biscuit :=
+    /// H(spki) – Ident ifies the initiator
+    pidi: KEY_LEN,
+    /// The biscuit number (replay protection)
+    biscuit_no: 12,
+    /// Chaining key
+    ck: KEY_LEN
+}
+
+lense! { DataMsg :=
+    dummy: 4
+}
+
+lense! { CookieReply :=
+    dummy: 4
+}
+
+// Traits /////////////////////////////////////////////////////////////////////
+
+pub trait WireMsg: std::fmt::Debug {
+    const MSG_TYPE: MsgType;
+    const MSG_TYPE_U8: u8 = Self::MSG_TYPE as u8;
+    const BYTES: usize;
+}
+
+// Constants //////////////////////////////////////////////////////////////////
+
+pub const SESSION_ID_LEN: usize = 4;
+pub const BISCUIT_ID_LEN: usize = 12;
+
+pub const WIRE_ENVELOPE_LEN: usize = 1 + 3 + 16 + 16; // TODO verify this
+
+/// Size required to fit any message in binary form
+pub const MAX_MESSAGE_LEN: usize = 2500; // TODO fix this
+
+/// Recognized message types
+#[repr(u8)]
+#[derive(Hash, PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Copy)]
+pub enum MsgType {
+    InitHello = 0x81,
+    RespHello = 0x82,
+    InitConf = 0x83,
+    EmptyData = 0x84,
+    DataMsg = 0x85,
+    CookieReply = 0x86,
+}
+
+impl TryFrom<u8> for MsgType {
+    type Error = RosenpassError;
+
+    fn try_from(value: u8) -> Result<Self, Self::Error> {
+        Ok(match value {
+            0x81 => MsgType::InitHello,
+            0x82 => MsgType::RespHello,
+            0x83 => MsgType::InitConf,
+            0x84 => MsgType::EmptyData,
+            0x85 => MsgType::DataMsg,
+            0x86 => MsgType::CookieReply,
+            _ => return Err(RosenpassError::InvalidMessageType(value)),
+        })
+    }
+}
+
+/// length in bytes of an unencrypted Biscuit (plain text)
+pub const BISCUIT_PT_LEN: usize = Biscuit::<()>::LEN;
+
+/// Length in bytes of an encrypted Biscuit (cipher text)
+pub const BISCUIT_CT_LEN: usize = BISCUIT_PT_LEN + xaead::NONCE_LEN + xaead::TAG_LEN;
+
+#[cfg(test)]
+mod test_constants {
+    use crate::msgs::{BISCUIT_CT_LEN, BISCUIT_PT_LEN};
+    use rosenpass_ciphers::{xaead, KEY_LEN};
+
+    #[test]
+    fn sodium_keysize() {
+        assert_eq!(KEY_LEN, 32);
+    }
+
+    #[test]
+    fn biscuit_pt_len() {
+        assert_eq!(BISCUIT_PT_LEN, 2 * KEY_LEN + 12);
+    }
+
+    #[test]
+    fn biscuit_ct_len() {
+        assert_eq!(
+            BISCUIT_CT_LEN,
+            BISCUIT_PT_LEN + xaead::NONCE_LEN + xaead::TAG_LEN
+        );
+    }
+}

rosenpass/tests/integration_test.rs

@@ -8,21 +8,21 @@ fn generate_keys() {
     let tmpdir = PathBuf::from(env!("CARGO_TARGET_TMPDIR")).join("keygen");
     fs::create_dir_all(&tmpdir).unwrap();
 
-    let priv_key_path = tmpdir.join("private-key");
-    let pub_key_path = tmpdir.join("public-key");
+    let secret_key_path = tmpdir.join("secret-key");
+    let public_key_path = tmpdir.join("public-key");
 
     let output = test_bin::get_test_bin(BIN)
-        .args(["keygen", "private-key"])
-        .arg(&priv_key_path)
-        .arg("public-key")
-        .arg(&pub_key_path)
+        .args(["gen-keys", "--secret-key"])
+        .arg(&secret_key_path)
+        .arg("--public-key")
+        .arg(&public_key_path)
         .output()
         .expect("Failed to start {BIN}");
 
     assert_eq!(String::from_utf8_lossy(&output.stdout), "");
 
-    assert!(priv_key_path.is_file());
-    assert!(pub_key_path.is_file());
+    assert!(secret_key_path.is_file());
+    assert!(public_key_path.is_file());
 
     // cleanup
     fs::remove_dir_all(&tmpdir).unwrap();
@@ -46,22 +46,22 @@ fn check_exchange() {
     let tmpdir = PathBuf::from(env!("CARGO_TARGET_TMPDIR")).join("exchange");
     fs::create_dir_all(&tmpdir).unwrap();
 
-    let priv_key_paths = [tmpdir.join("private-key-0"), tmpdir.join("private-key-1")];
-    let pub_key_paths = [tmpdir.join("public-key-0"), tmpdir.join("public-key-1")];
+    let secret_key_paths = [tmpdir.join("secret-key-0"), tmpdir.join("secret-key-1")];
+    let public_key_paths = [tmpdir.join("public-key-0"), tmpdir.join("public-key-1")];
     let shared_key_paths = [tmpdir.join("shared-key-0"), tmpdir.join("shared-key-1")];
 
     // generate key pairs
-    for (priv_key_path, pub_key_path) in priv_key_paths.iter().zip(pub_key_paths.iter()) {
+    for (secret_key_path, pub_key_path) in secret_key_paths.iter().zip(public_key_paths.iter()) {
         let output = test_bin::get_test_bin(BIN)
-            .args(["keygen", "private-key"])
-            .arg(&priv_key_path)
-            .arg("public-key")
+            .args(["gen-keys", "--secret-key"])
+            .arg(&secret_key_path)
+            .arg("--public-key")
             .arg(&pub_key_path)
             .output()
             .expect("Failed to start {BIN}");
 
         assert_eq!(String::from_utf8_lossy(&output.stdout), "");
-        assert!(priv_key_path.is_file());
+        assert!(secret_key_path.is_file());
         assert!(pub_key_path.is_file());
     }
 
@@ -69,12 +69,12 @@ fn check_exchange() {
     let port = find_udp_socket();
     let listen_addr = format!("localhost:{port}");
     let mut server = test_bin::get_test_bin(BIN)
-        .args(["exchange", "private-key"])
-        .arg(&priv_key_paths[0])
+        .args(["exchange", "secret-key"])
+        .arg(&secret_key_paths[0])
         .arg("public-key")
-        .arg(&pub_key_paths[0])
+        .arg(&public_key_paths[0])
         .args(["listen", &listen_addr, "verbose", "peer", "public-key"])
-        .arg(&pub_key_paths[1])
+        .arg(&public_key_paths[1])
         .arg("outfile")
         .arg(&shared_key_paths[0])
         .stdout(Stdio::null())
@@ -82,14 +82,16 @@ fn check_exchange() {
         .spawn()
         .expect("Failed to start {BIN}");
 
+    std::thread::sleep(Duration::from_millis(500));
+
     // start second process, the client
     let mut client = test_bin::get_test_bin(BIN)
-        .args(["exchange", "private-key"])
-        .arg(&priv_key_paths[1])
+        .args(["exchange", "secret-key"])
+        .arg(&secret_key_paths[1])
         .arg("public-key")
-        .arg(&pub_key_paths[1])
+        .arg(&public_key_paths[1])
         .args(["verbose", "peer", "public-key"])
-        .arg(&pub_key_paths[0])
+        .arg(&public_key_paths[0])
         .args(["endpoint", &listen_addr])
         .arg("outfile")
         .arg(&shared_key_paths[1])

rp

@@ -43,6 +43,17 @@ dbg() {
   echo >&2 "$@"
 }
 
+
+detect_git_dir() {
+  # https://stackoverflow.com/questions/3618078/pipe-only-stderr-through-a-filter
+  (
+    git -C "${scriptdir}" rev-parse --show-toplevel 3>&1 1>&2 2>&3 3>&- \
+      | sed '
+          /not a git repository/d;
+          s/^/WARNING: /'
+  ) 3>&1 1>&2 2>&3 3>&-
+}
+
 # Cleanup subsystem (sigterm)
 
 cleanup_init() {
@@ -141,9 +152,9 @@ genkey() {
     umask 077
     mkdir -p $(enquote "${skdir}")
     wg genkey > $(enquote "${skdir}"/wgsk)
-    $(enquote "${binary}") keygen \\
-      private-key $(enquote "${skdir}"/pqsk) \\
-      public-key  $(enquote "${skdir}"/pqpk)"
+    $(enquote "${binary}") gen-keys \\
+      -s $(enquote "${skdir}"/pqsk) \\
+      -p  $(enquote "${skdir}"/pqpk)"
 }
 
 pubkey() {
@@ -186,7 +197,7 @@ exchange() {
         lip="${listen%:*}";
         lport="${listen/*:/}";
         if [[ "$lip" = "$lport" ]]; then
-          lip="[0::0]"
+          lip="[::]"
         fi
         shift;;
       -h | -help | --help | help) usage; return 0;;
@@ -198,15 +209,41 @@ exchange() {
     fatal "Needs at least one peer specified"
   fi
 
-  frag "
-    # Create the Wireguard interface
-    ip link add dev $(enquote "${dev}") type wireguard || true"
+  # os dependent setup
+  case "$OSTYPE" in
+    linux-*) # could be linux-gnu or linux-musl
+      frag "
+        # Create the WireGuard interface
+        ip link add dev $(enquote "${dev}") type wireguard || true"
 
-  cleanup "
-    ip link del dev $(enquote "${dev}") || true"
+      cleanup "
+        ip link del dev $(enquote "${dev}") || true"
 
-  frag "
-    ip link set dev $(enquote "${dev}") up"
+      frag "
+        ip link set dev $(enquote "${dev}") up"
+      ;;
+
+    freebsd*)
+      frag "
+        # load the WireGuard kernel module
+        kldload -n if_wg || fatal 'Cannot load if_wg kernel module'"
+
+      frag "
+        # Create the WireGuard interface
+        ifconfig wg create name $(enquote "${dev}") || true"
+
+      cleanup "
+        ifconfig $(enquote "${dev}") destroy || true"
+
+      frag "
+        ifconfig $(enquote "${dev}") up"
+      ;;
+
+    *)
+      fatal "Your system $OSTYPE is not yet supported. We are happy to receive patches to address this :)"
+      ;;
+
+  esac
 
   frag "
     # Deploy the classic wireguard private key
@@ -225,7 +262,7 @@ exchange() {
     frag_append "verbose"
   fi
 
-  frag_append_esc "    private-key $(enquote "${skdir}/pqsk")"
+  frag_append_esc "    secret-key $(enquote "${skdir}/pqsk")"
   frag_append_esc "    public-key  $(enquote "${skdir}/pqpk")"
 
   if test -n "${lport}"; then
@@ -244,7 +281,7 @@ exchange() {
       local arg; arg="$1"; shift
       case "${arg}" in
         peer) set -- "peer" "$@"; break;; # Next peer
-        endpoint) ip="${1%:*}"; port="${1/*:/}"; shift;;
+        endpoint) ip="${1%:*}"; port="${1##*:}"; shift;;
         persistent-keepalive) keepalive="${1}"; shift;;
         allowed-ips) allowedips="${1}"; shift;;
         -h | -help | --help | help) usage; return 0;;
@@ -314,8 +351,10 @@ main() {
   project_name="rosenpass"
   verbose=0
   scriptdir="$(dirname "${script}")"
-  gitdir="$(git -C "${scriptdir}" rev-parse --show-toplevel 2>/dev/null)" || true
-  nixdir="$(readlink -f result/bin/rp | grep -Pio '^/nix/store/[^/]+(?=/bin/[^/]+)')" || true
+  gitdir="$(detect_git_dir)" || true
+  if [[ -d /nix ]]; then
+    nixdir="$(readlink -f result/bin/rp | grep -Pio '^/nix/store/[^/]+(?=/bin/[^/]+)')" || true
+  fi
   binary="$(find_rosenpass_binary)"
 
   # Parse command

secret-memory/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "rosenpass-secret-memory"
+version = "0.1.0"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal utilities for storing secrets in memory"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+[dependencies]
+anyhow = { workspace = true }
+rosenpass-to = { workspace = true }
+rosenpass-sodium = { workspace = true }
+rosenpass-util = { workspace = true }
+libsodium-sys-stable = { workspace = true }
+lazy_static = { workspace = true }
+zeroize = { workspace = true }
+rand = { workspace = true }

secret-memory/readme.md

@@ -0,0 +1,5 @@
+# Rosenpass secure memory library
+
+Rosenpass internal library providing utilities for securely storing secret data in memory.
+
+This is an internal library; not guarantee is made about its API at this point in time.

secret-memory/src/debug.rs

@@ -0,0 +1,20 @@
+use std::fmt;
+
+/// Writes the contents of an `&[u8]` as hexadecimal symbols to a [std::fmt::Formatter]
+pub fn debug_crypto_array(v: &[u8], fmt: &mut fmt::Formatter) -> fmt::Result {
+    fmt.write_str("[{}]=")?;
+    if v.len() > 64 {
+        for byte in &v[..32] {
+            std::fmt::LowerHex::fmt(byte, fmt)?;
+        }
+        fmt.write_str("…")?;
+        for byte in &v[v.len() - 32..] {
+            std::fmt::LowerHex::fmt(byte, fmt)?;
+        }
+    } else {
+        for byte in v {
+            std::fmt::LowerHex::fmt(byte, fmt)?;
+        }
+    }
+    Ok(())
+}

secret-memory/src/file.rs

@@ -0,0 +1,7 @@
+use std::path::Path;
+
+pub trait StoreSecret {
+    type Error;
+
+    fn store_secret<P: AsRef<Path>>(&self, path: P) -> Result<(), Self::Error>;
+}

secret-memory/src/lib.rs

@@ -0,0 +1,9 @@
+pub mod debug;
+pub mod file;
+pub mod rand;
+
+mod public;
+pub use crate::public::Public;
+
+mod secret;
+pub use crate::secret::Secret;

secret-memory/src/public.rs

@@ -0,0 +1,112 @@
+use crate::debug::debug_crypto_array;
+use rand::{Fill as Randomize, Rng};
+use rosenpass_to::{ops::copy_slice, To};
+use rosenpass_util::file::{fopen_r, LoadValue, ReadExactToEnd, StoreValue};
+use rosenpass_util::functional::mutating;
+use std::borrow::{Borrow, BorrowMut};
+use std::fmt;
+use std::ops::{Deref, DerefMut};
+use std::path::Path;
+
+/// Contains information in the form of a byte array that may be known to the
+/// public
+// TODO: We should get rid of the Public type; just use a normal value
+#[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
+#[repr(transparent)]
+pub struct Public<const N: usize> {
+    pub value: [u8; N],
+}
+
+impl<const N: usize> Public<N> {
+    /// Create a new [Public] from a byte slice
+    pub fn from_slice(value: &[u8]) -> Self {
+        copy_slice(value).to_this(|| Self::zero())
+    }
+
+    /// Create a new [Public] from a byte array
+    pub fn new(value: [u8; N]) -> Self {
+        Self { value }
+    }
+
+    /// Create a zero initialized [Public]
+    pub fn zero() -> Self {
+        Self { value: [0u8; N] }
+    }
+
+    /// Create a random initialized [Public]
+    pub fn random() -> Self {
+        mutating(Self::zero(), |r| r.randomize())
+    }
+
+    /// Randomize all bytes in an existing [Public]
+    pub fn randomize(&mut self) {
+        self.try_fill(&mut crate::rand::rng()).unwrap()
+    }
+}
+
+impl<const N: usize> Randomize for Public<N> {
+    fn try_fill<R: Rng + ?Sized>(&mut self, rng: &mut R) -> Result<(), rand::Error> {
+        self.value.try_fill(rng)
+    }
+}
+
+impl<const N: usize> fmt::Debug for Public<N> {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        debug_crypto_array(&self.value, fmt)
+    }
+}
+
+impl<const N: usize> Deref for Public<N> {
+    type Target = [u8; N];
+
+    fn deref(&self) -> &[u8; N] {
+        &self.value
+    }
+}
+
+impl<const N: usize> DerefMut for Public<N> {
+    fn deref_mut(&mut self) -> &mut [u8; N] {
+        &mut self.value
+    }
+}
+
+impl<const N: usize> Borrow<[u8; N]> for Public<N> {
+    fn borrow(&self) -> &[u8; N] {
+        &self.value
+    }
+}
+impl<const N: usize> BorrowMut<[u8; N]> for Public<N> {
+    fn borrow_mut(&mut self) -> &mut [u8; N] {
+        &mut self.value
+    }
+}
+
+impl<const N: usize> Borrow<[u8]> for Public<N> {
+    fn borrow(&self) -> &[u8] {
+        &self.value
+    }
+}
+impl<const N: usize> BorrowMut<[u8]> for Public<N> {
+    fn borrow_mut(&mut self) -> &mut [u8] {
+        &mut self.value
+    }
+}
+
+impl<const N: usize> LoadValue for Public<N> {
+    type Error = anyhow::Error;
+
+    fn load<P: AsRef<Path>>(path: P) -> anyhow::Result<Self> {
+        let mut v = Self::random();
+        fopen_r(path)?.read_exact_to_end(&mut *v)?;
+        Ok(v)
+    }
+}
+
+impl<const N: usize> StoreValue for Public<N> {
+    type Error = anyhow::Error;
+
+    fn store<P: AsRef<Path>>(&self, path: P) -> anyhow::Result<()> {
+        std::fs::write(path, **self)?;
+        Ok(())
+    }
+}

secret-memory/src/rand.rs

@@ -0,0 +1,5 @@
+pub type Rng = rand::rngs::ThreadRng;
+
+pub fn rng() -> Rng {
+    rand::thread_rng()
+}

secret-memory/src/secret.rs

@@ -0,0 +1,237 @@
+use crate::file::StoreSecret;
+use anyhow::Context;
+use lazy_static::lazy_static;
+use rand::{Fill as Randomize, Rng};
+use rosenpass_sodium::alloc::{Alloc as SodiumAlloc, Box as SodiumBox, Vec as SodiumVec};
+use rosenpass_util::{
+    b64::b64_reader,
+    file::{fopen_r, LoadValue, LoadValueB64, ReadExactToEnd},
+    functional::mutating,
+};
+use std::{collections::HashMap, convert::TryInto, fmt, path::Path, sync::Mutex};
+use zeroize::{Zeroize, ZeroizeOnDrop};
+
+// This might become a problem in library usage; it's effectively a memory
+// leak which probably isn't a problem right now because most memory will
+// be reused…
+lazy_static! {
+    static ref SECRET_CACHE: Mutex<SecretMemoryPool> = Mutex::new(SecretMemoryPool::new());
+}
+
+/// Pool that stores secret memory allocations
+///
+/// Allocation of secret memory is expensive. Thus, this struct provides a
+/// pool of secret memory, readily available to yield protected, slices of
+/// memory.
+///
+/// Further information about the protection in place can be found in in the
+/// [libsodium documentation](https://libsodium.gitbook.io/doc/memory_management#guarded-heap-allocations)
+#[derive(Debug)] // TODO check on Debug derive, is that clever
+struct SecretMemoryPool {
+    pool: HashMap<usize, Vec<SodiumBox<[u8]>>>,
+}
+
+impl SecretMemoryPool {
+    /// Create a new [SecretMemoryPool]
+    #[allow(clippy::new_without_default)]
+    pub fn new() -> Self {
+        Self {
+            pool: HashMap::new(),
+        }
+    }
+
+    /// Return secret back to the pool for future re-use
+    pub fn release<const N: usize>(&mut self, mut sec: SodiumBox<[u8; N]>) {
+        sec.zeroize();
+
+        // This conversion sequence is weird but at least it guarantees
+        // that the heap allocation is preserved according to the docs
+        let sec: SodiumVec<u8> = sec.into();
+        let sec: SodiumBox<[u8]> = sec.into();
+
+        self.pool.entry(N).or_default().push(sec);
+    }
+
+    /// Take protected memory from the pool, allocating new one if no suitable
+    /// chunk is found in the inventory.
+    ///
+    /// The secret is guaranteed to be full of nullbytes
+    pub fn take<const N: usize>(&mut self) -> SodiumBox<[u8; N]> {
+        let entry = self.pool.entry(N).or_default();
+        match entry.pop() {
+            None => SodiumBox::new_in([0u8; N], SodiumAlloc::default()),
+            Some(sec) => sec.try_into().unwrap(),
+        }
+    }
+}
+
+/// Storeage for a secret backed by [rosenpass_sodium::alloc::Alloc]
+pub struct Secret<const N: usize> {
+    storage: Option<SodiumBox<[u8; N]>>,
+}
+
+impl<const N: usize> Secret<N> {
+    pub fn from_slice(slice: &[u8]) -> Self {
+        let mut new_self = Self::zero();
+        new_self.secret_mut().copy_from_slice(slice);
+        new_self
+    }
+
+    /// Returns a new [Secret] that is zero initialized
+    pub fn zero() -> Self {
+        // Using [SecretMemoryPool] here because this operation is expensive,
+        // yet it is used in hot loops
+        Self {
+            storage: Some(SECRET_CACHE.lock().unwrap().take()),
+        }
+    }
+
+    /// Returns a new [Secret] that is randomized
+    pub fn random() -> Self {
+        mutating(Self::zero(), |r| r.randomize())
+    }
+
+    /// Sets all data an existing secret to random bytes
+    pub fn randomize(&mut self) {
+        self.try_fill(&mut crate::rand::rng()).unwrap()
+    }
+
+    /// Borrows the data
+    pub fn secret(&self) -> &[u8; N] {
+        self.storage.as_ref().unwrap()
+    }
+
+    /// Borrows the data mutably
+    pub fn secret_mut(&mut self) -> &mut [u8; N] {
+        self.storage.as_mut().unwrap()
+    }
+}
+
+impl<const N: usize> ZeroizeOnDrop for Secret<N> {}
+impl<const N: usize> Zeroize for Secret<N> {
+    fn zeroize(&mut self) {
+        self.secret_mut().zeroize();
+    }
+}
+
+impl<const N: usize> Randomize for Secret<N> {
+    fn try_fill<R: Rng + ?Sized>(&mut self, rng: &mut R) -> Result<(), rand::Error> {
+        // Zeroize self first just to make sure the barriers from the zeroize create take
+        // effect to prevent the compiler from optimizing this away.
+        // We should at some point replace this with our own barriers.
+        self.zeroize();
+        self.secret_mut().try_fill(rng)
+    }
+}
+
+impl<const N: usize> Drop for Secret<N> {
+    fn drop(&mut self) {
+        self.storage
+            .take()
+            .map(|sec| SECRET_CACHE.lock().unwrap().release(sec));
+    }
+}
+
+impl<const N: usize> Clone for Secret<N> {
+    fn clone(&self) -> Self {
+        Self::from_slice(self.secret())
+    }
+}
+
+/// The Debug implementation of [Secret] does not reveal the secret data,
+/// instead a placeholder `<SECRET>` is used
+impl<const N: usize> fmt::Debug for Secret<N> {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt.write_str("<SECRET>")
+    }
+}
+
+impl<const N: usize> LoadValue for Secret<N> {
+    type Error = anyhow::Error;
+
+    fn load<P: AsRef<Path>>(path: P) -> anyhow::Result<Self> {
+        let mut v = Self::random();
+        let p = path.as_ref();
+        fopen_r(p)?
+            .read_exact_to_end(v.secret_mut())
+            .with_context(|| format!("Could not load file {p:?}"))?;
+        Ok(v)
+    }
+}
+
+impl<const N: usize> LoadValueB64 for Secret<N> {
+    type Error = anyhow::Error;
+
+    fn load_b64<P: AsRef<Path>>(path: P) -> anyhow::Result<Self> {
+        use std::io::Read;
+
+        let mut v = Self::random();
+        let p = path.as_ref();
+        // This might leave some fragments of the secret on the stack;
+        // in practice this is likely not a problem because the stack likely
+        // will be overwritten by something else soon but this is not exactly
+        // guaranteed. It would be possible to remedy this, but since the secret
+        // data will linger in the Linux page cache anyways with the current
+        // implementation, going to great length to erase the secret here is
+        // not worth it right now.
+        b64_reader(&mut fopen_r(p)?)
+            .read_exact(v.secret_mut())
+            .with_context(|| format!("Could not load base64 file {p:?}"))?;
+        Ok(v)
+    }
+}
+
+impl<const N: usize> StoreSecret for Secret<N> {
+    type Error = anyhow::Error;
+
+    fn store_secret<P: AsRef<Path>>(&self, path: P) -> anyhow::Result<()> {
+        std::fs::write(path, self.secret())?;
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    /// check that we can alloc using the magic pool
+    #[test]
+    fn secret_memory_pool_take() {
+        rosenpass_sodium::init().unwrap();
+        const N: usize = 0x100;
+        let mut pool = SecretMemoryPool::new();
+        let secret: SodiumBox<[u8; N]> = pool.take();
+        assert_eq!(secret.as_ref(), &[0; N]);
+    }
+
+    /// check that a secrete lives, even if its [SecretMemoryPool] is deleted
+    #[test]
+    fn secret_memory_pool_drop() {
+        rosenpass_sodium::init().unwrap();
+        const N: usize = 0x100;
+        let mut pool = SecretMemoryPool::new();
+        let secret: SodiumBox<[u8; N]> = pool.take();
+        std::mem::drop(pool);
+        assert_eq!(secret.as_ref(), &[0; N]);
+    }
+
+    /// check that a secrete can be reborn, freshly initialized with zero
+    #[test]
+    fn secret_memory_pool_release() {
+        rosenpass_sodium::init().unwrap();
+        const N: usize = 1;
+        let mut pool = SecretMemoryPool::new();
+        let mut secret: SodiumBox<[u8; N]> = pool.take();
+        let old_secret_ptr = secret.as_ref().as_ptr();
+
+        secret.as_mut()[0] = 0x13;
+        pool.release(secret);
+
+        // now check that we get the same ptr
+        let new_secret: SodiumBox<[u8; N]> = pool.take();
+        assert_eq!(old_secret_ptr, new_secret.as_ref().as_ptr());
+
+        // and that the secret was zeroized
+        assert_eq!(new_secret.as_ref(), &[0; N]);
+    }
+}

sodium/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "rosenpass-sodium"
+authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "Rosenpass internal bindings to libsodium"
+homepage = "https://rosenpass.eu/"
+repository = "https://github.com/rosenpass/rosenpass"
+readme = "readme.md"
+
+[dependencies]
+rosenpass-util = { workspace = true }
+rosenpass-to = { workspace = true }
+anyhow = { workspace = true }
+libsodium-sys-stable = { workspace = true }
+log = { workspace = true }
+allocator-api2 = { workspace = true }

sodium/readme.md

@@ -0,0 +1,5 @@
+# Rosenpass internal libsodium bindings
+
+Rosenpass internal library providing bindings to libsodium.
+
+This is an internal library; not guarantee is made about its API at this point in time.

sodium/src/aead/chacha20poly1305_ietf.rs

@@ -0,0 +1,63 @@
+use libsodium_sys as libsodium;
+use std::ffi::c_ulonglong;
+use std::ptr::{null, null_mut};
+
+pub const KEY_LEN: usize = libsodium::crypto_aead_chacha20poly1305_IETF_KEYBYTES as usize;
+pub const TAG_LEN: usize = libsodium::crypto_aead_chacha20poly1305_IETF_ABYTES as usize;
+pub const NONCE_LEN: usize = libsodium::crypto_aead_chacha20poly1305_IETF_NPUBBYTES as usize;
+
+#[inline]
+pub fn encrypt(
+    ciphertext: &mut [u8],
+    key: &[u8],
+    nonce: &[u8],
+    ad: &[u8],
+    plaintext: &[u8],
+) -> anyhow::Result<()> {
+    assert!(ciphertext.len() == plaintext.len() + TAG_LEN);
+    assert!(key.len() == KEY_LEN);
+    assert!(nonce.len() == NONCE_LEN);
+    let mut clen: u64 = 0;
+    sodium_call!(
+        crypto_aead_chacha20poly1305_ietf_encrypt,
+        ciphertext.as_mut_ptr(),
+        &mut clen,
+        plaintext.as_ptr(),
+        plaintext.len() as c_ulonglong,
+        ad.as_ptr(),
+        ad.len() as c_ulonglong,
+        null(), // nsec is not used
+        nonce.as_ptr(),
+        key.as_ptr()
+    )?;
+    assert!(clen as usize == ciphertext.len());
+    Ok(())
+}
+
+#[inline]
+pub fn decrypt(
+    plaintext: &mut [u8],
+    key: &[u8],
+    nonce: &[u8],
+    ad: &[u8],
+    ciphertext: &[u8],
+) -> anyhow::Result<()> {
+    assert!(ciphertext.len() == plaintext.len() + TAG_LEN);
+    assert!(key.len() == KEY_LEN);
+    assert!(nonce.len() == NONCE_LEN);
+    let mut mlen: u64 = 0;
+    sodium_call!(
+        crypto_aead_chacha20poly1305_ietf_decrypt,
+        plaintext.as_mut_ptr(),
+        &mut mlen as *mut c_ulonglong,
+        null_mut(), // nsec is not used
+        ciphertext.as_ptr(),
+        ciphertext.len() as c_ulonglong,
+        ad.as_ptr(),
+        ad.len() as c_ulonglong,
+        nonce.as_ptr(),
+        key.as_ptr()
+    )?;
+    assert!(mlen as usize == plaintext.len());
+    Ok(())
+}

sodium/src/aead/mod.rs

@@ -0,0 +1,2 @@
+pub mod chacha20poly1305_ietf;
+pub mod xchacha20poly1305_ietf;

sodium/src/aead/xchacha20poly1305_ietf.rs

@@ -0,0 +1,63 @@
+use libsodium_sys as libsodium;
+use std::ffi::c_ulonglong;
+use std::ptr::{null, null_mut};
+
+pub const KEY_LEN: usize = libsodium::crypto_aead_xchacha20poly1305_IETF_KEYBYTES as usize;
+pub const TAG_LEN: usize = libsodium::crypto_aead_xchacha20poly1305_ietf_ABYTES as usize;
+pub const NONCE_LEN: usize = libsodium::crypto_aead_xchacha20poly1305_IETF_NPUBBYTES as usize;
+
+#[inline]
+pub fn encrypt(
+    ciphertext: &mut [u8],
+    key: &[u8],
+    nonce: &[u8],
+    ad: &[u8],
+    plaintext: &[u8],
+) -> anyhow::Result<()> {
+    assert!(ciphertext.len() == plaintext.len() + NONCE_LEN + TAG_LEN);
+    assert!(key.len() == libsodium::crypto_aead_xchacha20poly1305_IETF_KEYBYTES as usize);
+    let (n, ct) = ciphertext.split_at_mut(NONCE_LEN);
+    n.copy_from_slice(nonce);
+    let mut clen: u64 = 0;
+    sodium_call!(
+        crypto_aead_xchacha20poly1305_ietf_encrypt,
+        ct.as_mut_ptr(),
+        &mut clen,
+        plaintext.as_ptr(),
+        plaintext.len() as c_ulonglong,
+        ad.as_ptr(),
+        ad.len() as c_ulonglong,
+        null(), // nsec is not used
+        nonce.as_ptr(),
+        key.as_ptr()
+    )?;
+    assert!(clen as usize == ct.len());
+    Ok(())
+}
+
+#[inline]
+pub fn decrypt(
+    plaintext: &mut [u8],
+    key: &[u8],
+    ad: &[u8],
+    ciphertext: &[u8],
+) -> anyhow::Result<()> {
+    assert!(ciphertext.len() == plaintext.len() + NONCE_LEN + TAG_LEN);
+    assert!(key.len() == KEY_LEN);
+    let (n, ct) = ciphertext.split_at(NONCE_LEN);
+    let mut mlen: u64 = 0;
+    sodium_call!(
+        crypto_aead_xchacha20poly1305_ietf_decrypt,
+        plaintext.as_mut_ptr(),
+        &mut mlen as *mut c_ulonglong,
+        null_mut(), // nsec is not used
+        ct.as_ptr(),
+        ct.len() as c_ulonglong,
+        ad.as_ptr(),
+        ad.len() as c_ulonglong,
+        n.as_ptr(),
+        key.as_ptr()
+    )?;
+    assert!(mlen as usize == plaintext.len());
+    Ok(())
+}

sodium/src/alloc/allocator.rs

@@ -0,0 +1,95 @@
+use allocator_api2::alloc::{AllocError, Allocator, Layout};
+use libsodium_sys as libsodium;
+use std::fmt;
+use std::os::raw::c_void;
+use std::ptr::NonNull;
+
+#[derive(Clone, Default)]
+struct AllocatorContents;
+
+/// Memory allocation using sodium_malloc/sodium_free
+#[derive(Clone, Default)]
+pub struct Alloc {
+    _dummy_private_data: AllocatorContents,
+}
+
+impl Alloc {
+    pub fn new() -> Self {
+        Alloc {
+            _dummy_private_data: AllocatorContents,
+        }
+    }
+}
+
+unsafe impl Allocator for Alloc {
+    fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
+        // Call sodium allocator
+        let ptr = unsafe { libsodium::sodium_malloc(layout.size()) };
+
+        // Ensure the right allocation is used
+        let off = ptr.align_offset(layout.align());
+        if off != 0 {
+            log::error!("Allocation {layout:?} was requested but libsodium returned allocation \
+                with offset {off} from the requested alignment. Libsodium always allocates values \
+                at the end of a memory page for security reasons, custom alignments are not supported. \
+                You could try allocating an oversized value.");
+            return Err(AllocError);
+        }
+
+        // Convert to a pointer size
+        let ptr = core::ptr::slice_from_raw_parts_mut(ptr as *mut u8, layout.size());
+
+        // Conversion to a *const u8, then to a &[u8]
+        match NonNull::new(ptr) {
+            None => {
+                log::error!(
+                    "Allocation {layout:?} was requested but libsodium returned a null pointer"
+                );
+                Err(AllocError)
+            }
+            Some(ret) => Ok(ret),
+        }
+    }
+
+    unsafe fn deallocate(&self, ptr: NonNull<u8>, _layout: Layout) {
+        unsafe {
+            libsodium::sodium_free(ptr.as_ptr() as *mut c_void);
+        }
+    }
+}
+
+impl fmt::Debug for Alloc {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt.write_str("<libsodium based Rust allocator>")
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    /// checks that the can malloc with libsodium
+    #[test]
+    fn sodium_allocation() {
+        crate::init().unwrap();
+        let alloc = Alloc::new();
+        sodium_allocation_impl::<0>(&alloc);
+        sodium_allocation_impl::<7>(&alloc);
+        sodium_allocation_impl::<8>(&alloc);
+        sodium_allocation_impl::<64>(&alloc);
+        sodium_allocation_impl::<999>(&alloc);
+    }
+
+    fn sodium_allocation_impl<const N: usize>(alloc: &Alloc) {
+        crate::init().unwrap();
+        let layout = Layout::new::<[u8; N]>();
+        let mem = alloc.allocate(layout).unwrap();
+
+        // https://libsodium.gitbook.io/doc/memory_management#guarded-heap-allocations
+        // promises us that allocated memory is initialized with the magic byte 0xDB
+        assert_eq!(unsafe { mem.as_ref() }, &[0xDBu8; N]);
+
+        let mem = NonNull::new(mem.as_ptr() as *mut u8).unwrap();
+        unsafe { alloc.deallocate(mem, layout) };
+    }
+}

sodium/src/alloc/mod.rs

@@ -0,0 +1,10 @@
+//! Access to sodium_malloc/sodium_free
+
+mod allocator;
+pub use allocator::Alloc;
+
+/// A box backed by sodium_malloc
+pub type Box<T> = allocator_api2::boxed::Box<T, Alloc>;
+
+/// A vector backed by sodium_malloc
+pub type Vec<T> = allocator_api2::vec::Vec<T, Alloc>;

sodium/src/hash/blake2b.rs

@@ -0,0 +1,31 @@
+use libsodium_sys as libsodium;
+use rosenpass_to::{with_destination, To};
+use std::ffi::c_ulonglong;
+use std::ptr::null;
+
+pub const KEY_MIN: usize = libsodium::crypto_generichash_blake2b_KEYBYTES_MIN as usize;
+pub const KEY_MAX: usize = libsodium::crypto_generichash_blake2b_KEYBYTES_MAX as usize;
+pub const OUT_MIN: usize = libsodium::crypto_generichash_blake2b_BYTES_MIN as usize;
+pub const OUT_MAX: usize = libsodium::crypto_generichash_blake2b_BYTES_MAX as usize;
+
+#[inline]
+pub fn hash<'a>(key: &'a [u8], data: &'a [u8]) -> impl To<[u8], anyhow::Result<()>> + 'a {
+    with_destination(|out: &mut [u8]| {
+        assert!(key.is_empty() || (KEY_MIN <= key.len() && key.len() <= KEY_MAX));
+        assert!(OUT_MIN <= out.len() && out.len() <= OUT_MAX);
+        let kptr = match key.len() {
+            // NULL key
+            0 => null(),
+            _ => key.as_ptr(),
+        };
+        sodium_call!(
+            crypto_generichash_blake2b,
+            out.as_mut_ptr(),
+            out.len(),
+            data.as_ptr(),
+            data.len() as c_ulonglong,
+            kptr,
+            key.len()
+        )
+    })
+}

sodium/src/hash/mod.rs

@@ -0,0 +1 @@
+pub mod blake2b;

sodium/src/helpers.rs

@@ -0,0 +1,28 @@
+use libsodium_sys as libsodium;
+use std::os::raw::c_void;
+
+#[inline]
+pub fn memcmp(a: &[u8], b: &[u8]) -> bool {
+    a.len() == b.len()
+        && unsafe {
+            let r = libsodium::sodium_memcmp(
+                a.as_ptr() as *const c_void,
+                b.as_ptr() as *const c_void,
+                a.len(),
+            );
+            r == 0
+        }
+}
+
+#[inline]
+pub fn compare(a: &[u8], b: &[u8]) -> i32 {
+    assert!(a.len() == b.len());
+    unsafe { libsodium::sodium_compare(a.as_ptr(), b.as_ptr(), a.len()) }
+}
+
+#[inline]
+pub fn increment(v: &mut [u8]) {
+    unsafe {
+        libsodium::sodium_increment(v.as_mut_ptr(), v.len());
+    }
+}

sodium/src/lib.rs

@@ -0,0 +1,21 @@
+use libsodium_sys as libsodium;
+
+macro_rules! sodium_call {
+    ($name:ident, $($args:expr),*) => { ::rosenpass_util::attempt!({
+        anyhow::ensure!(unsafe{libsodium::$name($($args),*)} > -1,
+            "Error in libsodium's {}.", stringify!($name));
+        Ok(())
+    })};
+    ($name:ident) => { sodium_call!($name, ) };
+}
+
+#[inline]
+pub fn init() -> anyhow::Result<()> {
+    log::trace!("initializing libsodium");
+    sodium_call!(sodium_init)
+}
+
+pub mod aead;
+pub mod alloc;
+pub mod hash;
+pub mod helpers;

src/coloring.rs

@@ -1,358 +0,0 @@
-//! This module contains various types for dealing with secrets
-//!
-//! These types use type level coloring to make accidential leackage of secrets extra hard.
-//!
-
-use crate::{
-    sodium::{rng, zeroize},
-    util::{cpy, mutating},
-};
-use lazy_static::lazy_static;
-use libsodium_sys as libsodium;
-use std::{
-    collections::HashMap,
-    convert::TryInto,
-    fmt,
-    ops::{Deref, DerefMut},
-    os::raw::c_void,
-    ptr::null_mut,
-    sync::Mutex,
-};
-
-// This might become a problem in library usage; it's effectively a memory
-// leak which probably isn't a problem right now because most memory will
-// be reused…
-lazy_static! {
-    static ref SECRET_CACHE: Mutex<SecretMemoryPool> = Mutex::new(SecretMemoryPool::new());
-}
-
-/// Pool that stores secret memory allocations
-///
-/// Allocation of secret memory is expensive. Thus, this struct provides a
-/// pool of secret memory, readily available to yield protected, slices of
-/// memory.
-///
-/// Further information about the protection in place can be found in in the
-/// [libsodium documentation](https://libsodium.gitbook.io/doc/memory_management#guarded-heap-allocations)
-#[derive(Debug)] // TODO check on Debug derive, is that clever
-pub struct SecretMemoryPool {
-    pool: HashMap<usize, Vec<*mut c_void>>,
-}
-
-impl SecretMemoryPool {
-    /// Create a new [SecretMemoryPool]
-    #[allow(clippy::new_without_default)]
-    pub fn new() -> Self {
-        let pool = HashMap::new();
-
-        Self { pool }
-    }
-
-    /// Return secrete back to the pool for future re-use
-    ///
-    /// This consumes the [Secret], but its memory is re-used.
-    pub fn release<const N: usize>(&mut self, mut s: Secret<N>) {
-        unsafe {
-            self.release_by_ref(&mut s);
-        }
-        std::mem::forget(s);
-    }
-
-    /// Return secret back to the pool for future re-use, by slice
-    ///
-    /// # Safety
-    ///
-    /// After calling this function on a [Secret], the secret must never be
-    /// used again for anything.
-    unsafe fn release_by_ref<const N: usize>(&mut self, s: &mut Secret<N>) {
-        s.zeroize();
-        let Secret { ptr: secret } = s;
-        // don't call Secret::drop, that could cause a double free
-        self.pool.entry(N).or_default().push(*secret);
-    }
-
-    /// Take protected memory from the pool, allocating new one if no suitable
-    /// chunk is found in the inventory.
-    ///
-    /// The secret is guaranteed to be full of nullbytes
-    ///
-    /// # Safety
-    ///
-    /// This function contains an unsafe call to [libsodium::sodium_malloc].
-    /// This call has no known safety invariants, thus nothing can go wrong™.
-    /// However, just like normal `malloc()` this can return a null ptr. Thus
-    /// the returned pointer is checked for null; causing the program to panic
-    /// if it is null.
-    pub fn take<const N: usize>(&mut self) -> Secret<N> {
-        let entry = self.pool.entry(N).or_default();
-        let secret = entry.pop().unwrap_or_else(|| {
-            let ptr = unsafe { libsodium::sodium_malloc(N) };
-            assert!(
-                !ptr.is_null(),
-                "libsodium::sodium_mallloc() returned a null ptr"
-            );
-            ptr
-        });
-
-        let mut s = Secret { ptr: secret };
-        s.zeroize();
-        s
-    }
-}
-
-impl Drop for SecretMemoryPool {
-    /// # Safety
-    ///
-    /// The drop implementation frees the contained elements using
-    /// [libsodium::sodium_free]. This is safe as long as every `*mut c_void`
-    /// contained was initialized with a call to [libsodium::sodium_malloc]
-    fn drop(&mut self) {
-        for ptr in self.pool.drain().flat_map(|(_, x)| x.into_iter()) {
-            unsafe {
-                libsodium::sodium_free(ptr);
-            }
-        }
-    }
-}
-
-/// # Safety
-///
-/// No safety implications are known, since the `*mut c_void` in
-/// is essentially used like a `&mut u8` [SecretMemoryPool].
-unsafe impl Send for SecretMemoryPool {}
-
-/// Store for a secret
-///
-/// Uses memory allocated with [libsodium::sodium_malloc],
-/// esentially can do the same things as `[u8; N].as_mut_ptr()`.
-pub struct Secret<const N: usize> {
-    ptr: *mut c_void,
-}
-
-impl<const N: usize> Clone for Secret<N> {
-    fn clone(&self) -> Self {
-        let mut new = Self::zero();
-        new.secret_mut().clone_from_slice(self.secret());
-        new
-    }
-}
-
-impl<const N: usize> Drop for Secret<N> {
-    fn drop(&mut self) {
-        self.zeroize();
-        // the invariant that the [Secret] is not used after the
-        // `release_by_ref` call is guaranteed, since this is a drop implementation
-        unsafe { SECRET_CACHE.lock().unwrap().release_by_ref(self) };
-        self.ptr = null_mut();
-    }
-}
-
-impl<const N: usize> Secret<N> {
-    pub fn from_slice(slice: &[u8]) -> Self {
-        let mut new_self = Self::zero();
-        new_self.secret_mut().copy_from_slice(slice);
-        new_self
-    }
-
-    /// Returns a new [Secret] that is zero initialized
-    pub fn zero() -> Self {
-        // Using [SecretMemoryPool] here because this operation is expensive,
-        // yet it is used in hot loops
-        let s = SECRET_CACHE.lock().unwrap().take();
-        assert_eq!(s.secret(), &[0u8; N]);
-        s
-    }
-
-    /// Returns a new [Secret] that is randomized
-    pub fn random() -> Self {
-        mutating(Self::zero(), |r| r.randomize())
-    }
-
-    /// Sets all data of an existing secret to null bytes
-    pub fn zeroize(&mut self) {
-        zeroize(self.secret_mut());
-    }
-
-    /// Sets all data an existing secret to random bytes
-    pub fn randomize(&mut self) {
-        rng(self.secret_mut());
-    }
-
-    /// Borrows the data
-    pub fn secret(&self) -> &[u8; N] {
-        // - calling `from_raw_parts` is safe, because `ptr` is initalized with
-        //   as `N` byte allocation from the creation of `Secret` onwards. `ptr`
-        //   stays valid over the full lifetime of `Secret`
-        //
-        // - calling uwnrap is safe, because we can guarantee that the slice has
-        //   exactly the required size `N` to create an array of `N` elements.
-        let ptr = self.ptr as *const u8;
-        let slice = unsafe { std::slice::from_raw_parts(ptr, N) };
-        slice.try_into().unwrap()
-    }
-
-    /// Borrows the data mutably
-    pub fn secret_mut(&mut self) -> &mut [u8; N] {
-        // the same safety argument as for `secret()` holds
-        let ptr = self.ptr as *mut u8;
-        let slice = unsafe { std::slice::from_raw_parts_mut(ptr, N) };
-        slice.try_into().unwrap()
-    }
-}
-
-/// The Debug implementation of [Secret] does not reveal the secret data,
-/// instead a placeholder `<SECRET>` is used
-impl<const N: usize> fmt::Debug for Secret<N> {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        fmt.write_str("<SECRET>")
-    }
-}
-
-/// Contains information in the form of a byte array that may be known to the
-/// public
-// TODO: We should get rid of the Public type; just use a normal value
-#[derive(Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[repr(transparent)]
-pub struct Public<const N: usize> {
-    pub value: [u8; N],
-}
-
-impl<const N: usize> Public<N> {
-    /// Create a new [Public] from a byte slice
-    pub fn from_slice(value: &[u8]) -> Self {
-        mutating(Self::zero(), |r| cpy(value, &mut r.value))
-    }
-
-    /// Create a new [Public] from a byte array
-    pub fn new(value: [u8; N]) -> Self {
-        Self { value }
-    }
-
-    /// Create a zero initialized [Public]
-    pub fn zero() -> Self {
-        Self { value: [0u8; N] }
-    }
-
-    /// Create a random initialized [Public]
-    pub fn random() -> Self {
-        mutating(Self::zero(), |r| r.randomize())
-    }
-
-    /// Randomize all bytes in an existing [Public]
-    pub fn randomize(&mut self) {
-        rng(&mut self.value);
-    }
-}
-
-/// Writes the contents of an `&[u8]` as hexadecimal symbols to a [std::fmt::Formatter]
-pub fn debug_crypto_array(v: &[u8], fmt: &mut fmt::Formatter) -> fmt::Result {
-    fmt.write_str("[{}]=")?;
-    if v.len() > 64 {
-        for byte in &v[..32] {
-            std::fmt::LowerHex::fmt(byte, fmt)?;
-        }
-        fmt.write_str("…")?;
-        for byte in &v[v.len() - 32..] {
-            std::fmt::LowerHex::fmt(byte, fmt)?;
-        }
-    } else {
-        for byte in v {
-            std::fmt::LowerHex::fmt(byte, fmt)?;
-        }
-    }
-    Ok(())
-}
-
-impl<const N: usize> fmt::Debug for Public<N> {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        debug_crypto_array(&self.value, fmt)
-    }
-}
-
-impl<const N: usize> Deref for Public<N> {
-    type Target = [u8; N];
-
-    fn deref(&self) -> &[u8; N] {
-        &self.value
-    }
-}
-
-impl<const N: usize> DerefMut for Public<N> {
-    fn deref_mut(&mut self) -> &mut [u8; N] {
-        &mut self.value
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    /// https://libsodium.gitbook.io/doc/memory_management#guarded-heap-allocations
-    /// promises us that allocated memory is initialized with this magic byte
-    const SODIUM_MAGIC_BYTE: u8 = 0xdb;
-
-    /// must be called before any interaction with libsodium
-    fn init() {
-        unsafe { libsodium_sys::sodium_init() };
-    }
-
-    /// checks that whe can malloc with libsodium
-    #[test]
-    fn sodium_malloc() {
-        init();
-        const N: usize = 8;
-        let ptr = unsafe { libsodium_sys::sodium_malloc(N) };
-        let mem = unsafe { std::slice::from_raw_parts(ptr as *mut u8, N) };
-        assert_eq!(mem, &[SODIUM_MAGIC_BYTE; N])
-    }
-
-    /// checks that whe can free with libsodium
-    #[test]
-    fn sodium_free() {
-        init();
-        const N: usize = 8;
-        let ptr = unsafe { libsodium_sys::sodium_malloc(N) };
-        unsafe { libsodium_sys::sodium_free(ptr) }
-    }
-
-    /// check that we can alloc using the magic pool
-    #[test]
-    fn secret_memory_pool_take() {
-        init();
-        const N: usize = 0x100;
-        let mut pool = SecretMemoryPool::new();
-        let secret: Secret<N> = pool.take();
-        assert_eq!(secret.secret(), &[0; N]);
-    }
-
-    /// check that a secrete lives, even if its [SecretMemoryPool] is deleted
-    #[test]
-    fn secret_memory_pool_drop() {
-        init();
-        const N: usize = 0x100;
-        let mut pool = SecretMemoryPool::new();
-        let secret: Secret<N> = pool.take();
-        std::mem::drop(pool);
-        assert_eq!(secret.secret(), &[0; N]);
-    }
-
-    /// check that a secrete can be reborn, freshly initialized with zero
-    #[test]
-    fn secret_memory_pool_release() {
-        init();
-        const N: usize = 1;
-        let mut pool = SecretMemoryPool::new();
-        let mut secret: Secret<N> = pool.take();
-        let old_secret_ptr = secret.ptr;
-
-        secret.secret_mut()[0] = 0x13;
-        pool.release(secret);
-
-        // now check that we get the same ptr
-        let new_secret: Secret<N> = pool.take();
-        assert_eq!(old_secret_ptr, new_secret.ptr);
-
-        // and that the secret was zeroized
-        assert_eq!(new_secret.secret(), &[0; N]);
-    }
-}

src/labeled_prf.rs

@@ -1,45 +0,0 @@
-use {
-    crate::{prftree::PrfTree, sodium::KEY_SIZE},
-    anyhow::Result,
-};
-
-pub fn protocol() -> Result<PrfTree> {
-    PrfTree::zero().mix("Rosenpass v1 mceliece460896 Kyber512 ChaChaPoly1305 BLAKE2s".as_bytes())
-}
-
-// TODO Use labels that can serve as idents
-macro_rules! prflabel {
-    ($base:ident, $name:ident, $($lbl:expr),* ) => {
-        pub fn $name() -> Result<PrfTree> {
-            let t = $base()?;
-            $( let t = t.mix($lbl.as_bytes())?; )*
-            Ok(t)
-        }
-    }
-}
-
-prflabel!(protocol, mac,        "mac");
-prflabel!(protocol, cookie,     "cookie");
-prflabel!(protocol, peerid,     "peer id");
-prflabel!(protocol, biscuit_ad, "biscuit additional data");
-prflabel!(protocol, ckinit,     "chaining key init");
-prflabel!(protocol, _ckextract,  "chaining key extract");
-
-macro_rules! prflabel_leaf {
-    ($base:ident, $name:ident, $($lbl:expr),* ) => {
-        pub fn $name() -> Result<[u8; KEY_SIZE]> {
-            let t = $base()?;
-            $( let t = t.mix($lbl.as_bytes())?; )*
-            Ok(t.into_value())
-        }
-    }
-}
-
-prflabel_leaf!(_ckextract, mix,        "mix");
-prflabel_leaf!(_ckextract, hs_enc,     "handshake encryption");
-prflabel_leaf!(_ckextract, ini_enc,    "initiator handshake encryption");
-prflabel_leaf!(_ckextract, res_enc,    "responder handshake encryption");
-
-prflabel!(_ckextract, _user, "user");
-prflabel!(_user, _rp, "rosenpass.eu");
-prflabel_leaf!(_rp, osk, "wireguard psk");

src/lib.rs

@@ -1,56 +0,0 @@
-#[macro_use]
-pub mod util;
-#[macro_use]
-pub mod sodium;
-pub mod coloring;
-pub mod labeled_prf;
-pub mod msgs;
-pub mod pqkem;
-pub mod prftree;
-pub mod protocol;
-
-#[derive(thiserror::Error, Debug)]
-pub enum RosenpassError {
-    #[error("error in OQS")]
-    Oqs,
-    #[error("error from external library while calling OQS")]
-    OqsExternalLib,
-    #[error("buffer size mismatch, required {required_size} but only found {actual_size}")]
-    BufferSizeMismatch {
-        required_size: usize,
-        actual_size: usize,
-    },
-    #[error("invalid message type")]
-    InvalidMessageType(u8),
-}
-
-impl RosenpassError {
-    /// Helper function to check a buffer size
-    fn check_buffer_size(required_size: usize, actual_size: usize) -> Result<(), Self> {
-        if required_size != actual_size {
-            Err(Self::BufferSizeMismatch {
-                required_size,
-                actual_size,
-            })
-        } else {
-            Ok(())
-        }
-    }
-}
-
-/// Extension trait to attach function calls to foreign types.
-trait RosenpassMaybeError {
-    /// Checks whether something is an error or not
-    fn to_rg_error(&self) -> Result<(), RosenpassError>;
-}
-
-impl RosenpassMaybeError for oqs_sys::common::OQS_STATUS {
-    fn to_rg_error(&self) -> Result<(), RosenpassError> {
-        use oqs_sys::common::OQS_STATUS;
-        match self {
-            OQS_STATUS::OQS_SUCCESS => Ok(()),
-            OQS_STATUS::OQS_ERROR => Err(RosenpassError::Oqs),
-            OQS_STATUS::OQS_EXTERNAL_LIB_ERROR_OPENSSL => Err(RosenpassError::OqsExternalLib),
-        }
-    }
-}

src/lprf.rs

@@ -1,106 +0,0 @@
-//! The rosenpass protocol relies on a special type
-//! of hash function for most of its hashing or
-//! message authentication needs: an incrementable
-//! pseudo random function.
-//!
-//! This is a generalization of a PRF operating
-//! on a sequence of inputs instead of a single input.
-//!
-//! Like a Dec function the Iprf features efficient 
-//! incrementability.
-//!
-//! You can also think of an Iprf as a Dec function with
-//! a fixed size output.
-//!
-//! The idea behind a Iprf is that it can be efficiently
-//! constructed from an Dec function as well as a PRF.
-//!
-//! TODO Base the construction on a proper Dec function
-
-pub struct Iprf([u8; KEY_SIZE]);
-pub struct IprfBranch([u8; KEY_SIZE]);
-pub struct SecretIprf(Secret<KEY_SIZE>);
-pub struct SecretIprfBranch(Secret<KEY_SIZE>);
-
-pub fn prf_into(out: &mut [u8], key: &[u8], data: &[u8]) {
-    // TODO: The error handling with sodium is a scurge
-    hmac_into(out, key, data).unwrap()
-}
-
-pub fn prf(key: &[u8], data: &[u8]) -> [u8; KEY_SIZE]{
-    mutating([0u8; KEY_SIZE], |r| prf_into(r, key, data))
-}
-
-impl Iprf {
-    fn zero() -> Self {
-        Self([0u8; KEY_SIZE])
-    }
-
-    fn dup(self) -> IprfBranch {
-        IprfBranch(self.0)
-    }
-
-    // TODO: Protocol! Use domain separation to ensure that 
-    fn mix(self, v: &[u8]) -> Self {
-        Self(prf(&self.0, v))
-    }
-    
-    fn mix_secret<const N: usize>(self, v: Secret<N>) -> SecretIprf {
-        SecretIprf::prf_invoc(&self.0, v.secret())
-    }
-
-    fn into_value(self) -> [u8; KEY_SIZE] {
-        self.0
-    }
-
-    fn extract(self, v: &[u8], dst: &mut [u8]) {
-        prf_into(&self.0, v, dst)
-    }
-}
-
-impl IprfBranch {
-    fn mix(&self, v: &[u8]) -> Iprf {
-        Iprf(prf(self.0, v))
-    }
-
-    fn mix_secret<const N: usize>(&self, v: Secret<N>) -> SecretIprf {
-        SecretIprf::prf_incov(self.0, v.secret())
-    }
-}
-
-impl SecretIprf {
-    fn prf_invoc(k: &[u8], d: &[u8]) -> SecretIprf {
-        mutating(SecretIprf(Secret::zero()), |r|
-            prf_into(k, d, r.secret_mut()))
-    }
-
-    fn from_key(k: Secret<N>) -> SecretIprf {
-        Self(k)
-    }
-
-    fn mix(self, v: &[u8]) -> SecretIprf {
-        Self::prf_invoc(self.0.secret(), v)
-    }
-
-    fn mix_secret<const N: usize>(self, v: Secret<N>) -> SecretIprf {
-        Self::prf_invoc(self.0.secret(), v.secret())
-    }
-
-    fn into_secret(self) -> Secret<KEY_SIZE> {
-        self.0
-    }
-
-    fn into_secret_slice(self, v: &[u8], dst: &[u8]) {
-        prf_into(self.0.secret(), v, dst)
-    }
-}
-
-impl SecretIprfBranch {
-    fn mix(&self, v: &[u8]) -> SecretIprf {
-        SecretIprf::prf_invoc(self.0.secret(), v)
-    }
-
-    fn mix_secret<const N: usize>(&self, v: Secret<N>) -> SecretIprf {
-        SecretIprf::prf_invoc(self.0.secret(), v.secret())
-    }
-}

src/main.rs

@@ -1,646 +0,0 @@
-use anyhow::{bail, ensure, Context, Result};
-use log::{error, info};
-use rosenpass::{
-    attempt,
-    coloring::{Public, Secret},
-    multimatch,
-    pqkem::{SKEM, KEM},
-    protocol::{SPk, SSk, MsgBuf, PeerPtr, Server as CryptoServer, SymKey, Timing},
-    sodium::sodium_init,
-    util::{b64_reader, b64_writer, fmt_b64},
-};
-use std::{
-    fs::{File, OpenOptions},
-    io::{ErrorKind, Read, Write},
-    net::{SocketAddr, ToSocketAddrs, UdpSocket},
-    path::Path,
-    process::{exit, Command, Stdio},
-    time::Duration,
-};
-
-/// Open a file writable
-pub fn fopen_w<P: AsRef<Path>>(path: P) -> Result<File> {
-    Ok(OpenOptions::new()
-        .read(false)
-        .write(true)
-        .create(true)
-        .truncate(true)
-        .open(path)?)
-}
-/// Open a file readable
-pub fn fopen_r<P: AsRef<Path>>(path: P) -> Result<File> {
-    Ok(OpenOptions::new()
-        .read(true)
-        .write(false)
-        .create(false)
-        .truncate(false)
-        .open(path)?)
-}
-
-pub trait ReadExactToEnd {
-    fn read_exact_to_end(&mut self, buf: &mut [u8]) -> Result<()>;
-}
-
-impl<R: Read> ReadExactToEnd for R {
-    fn read_exact_to_end(&mut self, buf: &mut [u8]) -> Result<()> {
-        let mut dummy = [0u8; 8];
-        self.read_exact(buf)?;
-        ensure!(self.read(&mut dummy)? == 0, "File too long!");
-        Ok(())
-    }
-}
-
-pub trait LoadValue {
-    fn load<P: AsRef<Path>>(path: P) -> Result<Self>
-    where
-        Self: Sized;
-}
-
-pub trait LoadValueB64 {
-    fn load_b64<P: AsRef<Path>>(path: P) -> Result<Self>
-    where
-        Self: Sized;
-}
-
-trait StoreValue {
-    fn store<P: AsRef<Path>>(&self, path: P) -> Result<()>;
-}
-
-trait StoreSecret {
-    unsafe fn store_secret<P: AsRef<Path>>(&self, path: P) -> Result<()>;
-}
-
-impl<T: StoreValue> StoreSecret for T {
-    unsafe fn store_secret<P: AsRef<Path>>(&self, path: P) -> Result<()> {
-        self.store(path)
-    }
-}
-
-impl<const N: usize> LoadValue for Secret<N> {
-    fn load<P: AsRef<Path>>(path: P) -> Result<Self> {
-        let mut v = Self::random();
-        let p = path.as_ref();
-        fopen_r(p)?
-            .read_exact_to_end(v.secret_mut())
-            .with_context(|| format!("Could not load file {p:?}"))?;
-        Ok(v)
-    }
-}
-
-impl<const N: usize> LoadValueB64 for Secret<N> {
-    fn load_b64<P: AsRef<Path>>(path: P) -> Result<Self> {
-        let mut v = Self::random();
-        let p = path.as_ref();
-        // This might leave some fragments of the secret on the stack;
-        // in practice this is likely not a problem because the stack likely
-        // will be overwritten by something else soon but this is not exactly
-        // guaranteed. It would be possible to remedy this, but since the secret
-        // data will linger in the linux page cache anyways with the current
-        // implementation, going to great length to erase the secret here is
-        // not worth it right now.
-        b64_reader(&mut fopen_r(p)?)
-            .read_exact(v.secret_mut())
-            .with_context(|| format!("Could not load base64 file {p:?}"))?;
-        Ok(v)
-    }
-}
-
-impl<const N: usize> StoreSecret for Secret<N> {
-    unsafe fn store_secret<P: AsRef<Path>>(&self, path: P) -> Result<()> {
-        std::fs::write(path, self.secret())?;
-        Ok(())
-    }
-}
-
-impl<const N: usize> LoadValue for Public<N> {
-    fn load<P: AsRef<Path>>(path: P) -> Result<Self> {
-        let mut v = Self::random();
-        fopen_r(path)?.read_exact_to_end(&mut *v)?;
-        Ok(v)
-    }
-}
-
-impl<const N: usize> StoreValue for Public<N> {
-    fn store<P: AsRef<Path>>(&self, path: P) -> Result<()> {
-        std::fs::write(path, **self)?;
-        Ok(())
-    }
-}
-
-macro_rules! bail_usage {
-    ($args:expr, $($pt:expr),*) => {{
-        error!($($pt),*);
-        cmd_help()?;
-        exit(1);
-    }}
-}
-
-macro_rules! ensure_usage {
-    ($args:expr, $ck:expr, $($pt:expr),*) => {{
-        if !$ck {
-            bail_usage!($args, $($pt),*);
-        }
-    }}
-}
-
-macro_rules! mandatory_opt {
-    ($args:expr, $val:expr, $name:expr) => {{
-        ensure_usage!($args, $val.is_some(), "{0} option is mandatory", $name)
-    }};
-}
-
-pub struct ArgsWalker {
-    pub argv: Vec<String>,
-    pub off: usize,
-}
-
-impl ArgsWalker {
-    pub fn get(&self) -> Option<&str> {
-        self.argv.get(self.off).map(|s| s as &str)
-    }
-
-    pub fn prev(&mut self) -> Option<&str> {
-        assert!(self.off > 0);
-        self.off -= 1;
-        self.get()
-    }
-
-    #[allow(clippy::should_implement_trait)]
-    pub fn next(&mut self) -> Option<&str> {
-        assert!(self.todo() > 0);
-        self.off += 1;
-        self.get()
-    }
-
-    pub fn opt(&mut self, dst: &mut Option<String>) -> Result<()> {
-        let cmd = &self.argv[self.off - 1];
-        ensure_usage!(&self, self.todo() > 0, "Option {} takes a value", cmd);
-        ensure_usage!(&self, dst.is_none(), "Cannot set {} multiple times.", cmd);
-        *dst = Some(String::from(self.next().unwrap()));
-        Ok(())
-    }
-
-    fn todo(&self) -> usize {
-        self.argv.len() - self.off
-    }
-}
-
-#[derive(Default, Debug)]
-pub struct WireguardOut {
-    // impl KeyOutput
-    dev: String,
-    pk: String,
-    extra_params: Vec<String>,
-}
-
-#[derive(Default, Debug)]
-pub struct AppPeer {
-    pub outfile: Option<String>,
-    pub outwg: Option<WireguardOut>,
-    pub tx_addr: Option<SocketAddr>,
-}
-
-#[derive(Debug)]
-pub enum Verbosity {
-    Quiet,
-    Verbose,
-}
-
-/// Holds the state of the application, namely the external IO
-#[derive(Debug)]
-pub struct AppServer {
-    pub crypt: CryptoServer,
-    pub sock: UdpSocket,
-    pub peers: Vec<AppPeer>,
-    pub verbosity: Verbosity,
-}
-
-/// Index based pointer to a Peer
-#[derive(Debug)]
-pub struct AppPeerPtr(pub usize);
-
-impl AppPeerPtr {
-    /// Takes an index based handle and returns the actual peer
-    pub fn lift(p: PeerPtr) -> Self {
-        Self(p.0)
-    }
-
-    /// Returns an index based handle to one Peer
-    pub fn lower(&self) -> PeerPtr {
-        PeerPtr(self.0)
-    }
-
-    pub fn get_app<'a>(&self, srv: &'a AppServer) -> &'a AppPeer {
-        &srv.peers[self.0]
-    }
-
-    pub fn get_app_mut<'a>(&self, srv: &'a mut AppServer) -> &'a mut AppPeer {
-        &mut srv.peers[self.0]
-    }
-}
-
-#[derive(Debug)]
-pub enum AppPollResult {
-    DeleteKey(AppPeerPtr),
-    SendInitiation(AppPeerPtr),
-    SendRetransmission(AppPeerPtr),
-    ReceivedMessage(usize, SocketAddr),
-}
-
-#[derive(Debug)]
-pub enum KeyOutputReason {
-    Exchanged,
-    Stale,
-}
-
-/// Catches errors, prints them through the logger, then exits
-pub fn main() {
-    env_logger::init();
-    match rosenpass_main() {
-        Ok(_) => {}
-        Err(e) => {
-            error!("{e}");
-            exit(1);
-        }
-    }
-}
-
-/// Entry point to the whole program
-pub fn rosenpass_main() -> Result<()> {
-    sodium_init()?;
-
-    let mut args = ArgsWalker {
-        argv: std::env::args().collect(),
-        off: 0, // skipping executable path
-    };
-
-    // Command parsing
-    match args.next() {
-        Some("help") | Some("-h") | Some("-help") | Some("--help") => cmd_help()?,
-        Some("keygen") => cmd_keygen(args)?,
-        Some("exchange") => cmd_exchange(args)?,
-        Some(cmd) => bail_usage!(&args, "No such command {}", cmd),
-        None => bail_usage!(&args, "Expected a command!"),
-    };
-
-    Ok(())
-}
-
-/// Print the usage information
-pub fn cmd_help() -> Result<()> {
-    eprint!(include_str!("usage.md"), env!("CARGO_BIN_NAME"));
-    Ok(())
-}
-
-/// Generate a keypair
-pub fn cmd_keygen(mut args: ArgsWalker) -> Result<()> {
-    let mut sf: Option<String> = None;
-    let mut pf: Option<String> = None;
-
-    // Arg parsing
-    loop {
-        match args.next() {
-            Some("private-key") => args.opt(&mut sf)?,
-            Some("public-key") => args.opt(&mut pf)?,
-            Some(opt) => bail_usage!(&args, "Unknown option `{}`", opt),
-            None => break,
-        };
-    }
-
-    mandatory_opt!(&args, sf, "private-key");
-    mandatory_opt!(&args, pf, "private-key");
-
-    // Cmd
-    let (mut ssk, mut spk) = (SSk::random(), SPk::random());
-    unsafe {
-        SKEM::keygen(ssk.secret_mut(), spk.secret_mut())?;
-        ssk.store_secret(sf.unwrap())?;
-        spk.store_secret(pf.unwrap())?;
-    }
-
-    Ok(())
-}
-
-pub fn cmd_exchange(mut args: ArgsWalker) -> Result<()> {
-    // Argument parsing
-    let mut sf: Option<String> = None;
-    let mut pf: Option<String> = None;
-    let mut listen: Option<String> = None;
-    let mut verbosity = Verbosity::Quiet;
-
-    // Global parameters
-    loop {
-        match args.next() {
-            Some("private-key") => args.opt(&mut sf)?,
-            Some("public-key") => args.opt(&mut pf)?,
-            Some("listen") => args.opt(&mut listen)?,
-            Some("verbose") => {
-                verbosity = Verbosity::Verbose;
-            }
-            Some("peer") => {
-                args.prev();
-                break;
-            }
-            Some(opt) => bail_usage!(&args, "Unknown option `{}`", opt),
-            None => break,
-        };
-    }
-
-    mandatory_opt!(&args, sf, "private-key");
-    mandatory_opt!(&args, pf, "public-key");
-
-    let mut srv = std::boxed::Box::<AppServer>::new(AppServer::new(
-        // sk, pk, addr
-        SSk::load(&sf.unwrap())?,
-        SPk::load(&pf.unwrap())?,
-        listen.as_deref().unwrap_or("[0::0]:0"),
-        verbosity,
-    )?);
-
-    // Peer parameters
-    '_parseAllPeers: while args.todo() > 0 {
-        let mut pf: Option<String> = None;
-        let mut outfile: Option<String> = None;
-        let mut outwg: Option<WireguardOut> = None;
-        let mut endpoint: Option<String> = None;
-        let mut pskf: Option<String> = None;
-
-        args.next(); // skip "peer" starter itself
-
-        'parseOnePeer: loop {
-            match args.next() {
-                // Done with this peer
-                Some("peer") => {
-                    args.prev();
-                    break 'parseOnePeer;
-                }
-                None => break 'parseOnePeer,
-                // Options
-                Some("public-key") => args.opt(&mut pf)?,
-                Some("endpoint") => args.opt(&mut endpoint)?,
-                Some("preshared-key") => args.opt(&mut pskf)?,
-                Some("outfile") => args.opt(&mut outfile)?,
-                // Wireguard out
-                Some("wireguard") => {
-                    ensure_usage!(
-                        &args,
-                        outwg.is_none(),
-                        "Cannot set wireguard output for the same peer multiple times."
-                    );
-                    ensure_usage!(&args, args.todo() >= 2, "Option wireguard takes to values");
-                    let dev = String::from(args.next().unwrap());
-                    let pk = String::from(args.next().unwrap());
-                    let wg = outwg.insert(WireguardOut {
-                        dev,
-                        pk,
-                        extra_params: Vec::new(),
-                    });
-                    '_parseWgOutExtra: loop {
-                        match args.next() {
-                            Some("peer") => {
-                                args.prev();
-                                break 'parseOnePeer;
-                            }
-                            None => break 'parseOnePeer,
-                            Some(xtra) => wg.extra_params.push(xtra.to_string()),
-                        };
-                    }
-                }
-                // Invalid
-                Some(opt) => bail_usage!(&args, "Unknown peer option `{}`", opt),
-            };
-        }
-
-        mandatory_opt!(&args, pf, "private-key");
-        ensure_usage!(
-            &args,
-            outfile.is_some() || outwg.is_some(),
-            "Either of the outfile or wireguard option is mandatory"
-        );
-
-        let tx_addr = endpoint
-            .map(|e| {
-                e.to_socket_addrs()?
-                    .next()
-                    .context("Expected address in endpoint parameter")
-            })
-            .transpose()?;
-
-        srv.add_peer(
-            // psk, pk, outfile, outwg, tx_addr
-            pskf.map(SymKey::load_b64).transpose()?,
-            SPk::load(&pf.unwrap())?,
-            outfile,
-            outwg,
-            tx_addr,
-        )?;
-    }
-
-    srv.listen_loop()
-}
-
-impl AppServer {
-    pub fn new<A: ToSocketAddrs>(
-        sk: SSk,
-        pk: SPk,
-        addr: A,
-        verbosity: Verbosity,
-    ) -> Result<Self> {
-        Ok(Self {
-            crypt: CryptoServer::new(sk, pk),
-            sock: UdpSocket::bind(addr)?,
-            peers: Vec::new(),
-            verbosity,
-        })
-    }
-
-    pub fn verbose(&self) -> bool {
-        matches!(self.verbosity, Verbosity::Verbose)
-    }
-
-    pub fn add_peer(
-        &mut self,
-        psk: Option<SymKey>,
-        pk: SPk,
-        outfile: Option<String>,
-        outwg: Option<WireguardOut>,
-        tx_addr: Option<SocketAddr>,
-    ) -> Result<AppPeerPtr> {
-        let PeerPtr(pn) = self.crypt.add_peer(psk, pk)?;
-        assert!(pn == self.peers.len());
-        self.peers.push(AppPeer {
-            outfile,
-            outwg,
-            tx_addr,
-        });
-        Ok(AppPeerPtr(pn))
-    }
-
-    pub fn listen_loop(&mut self) -> Result<()> {
-        const INIT_SLEEP: f64 = 0.01;
-        const MAX_FAILURES: i32 = 10;
-        let mut failure_cnt = 0;
-
-        loop {
-            let msgs_processed = 0usize;
-            let err = match self.event_loop() {
-                Ok(()) => return Ok(()),
-                Err(e) => e,
-            };
-
-            // This should not happen…
-            failure_cnt = if msgs_processed > 0 {
-                0
-            } else {
-                failure_cnt + 1
-            };
-            let sleep = INIT_SLEEP * 2.0f64.powf(f64::from(failure_cnt - 1));
-            let tries_left = MAX_FAILURES - (failure_cnt - 1);
-            error!(
-                "unexpected error after processing {} messages: {:?} {}",
-                msgs_processed,
-                err,
-                err.backtrace()
-            );
-            if tries_left > 0 {
-                error!("reinitializing networking in {sleep}! {tries_left} tries left.");
-                std::thread::sleep(self.crypt.timebase.dur(sleep));
-                continue;
-            }
-
-            bail!("too many network failures");
-        }
-    }
-
-    pub fn event_loop(&mut self) -> Result<()> {
-        let (mut rx, mut tx) = (MsgBuf::zero(), MsgBuf::zero());
-        macro_rules! tx_maybe_with {
-            ($peer:expr, $fn:expr) => {
-                attempt!({
-                    let p = $peer.get_app(self);
-                    if let Some(addr) = p.tx_addr {
-                        let len = $fn()?;
-                        self.sock.send_to(&tx[..len], addr)?;
-                    }
-                    Ok(())
-                })
-            };
-        }
-
-        loop {
-            use rosenpass::protocol::HandleMsgResult;
-            use AppPollResult::*;
-            use KeyOutputReason::*;
-            match self.poll(&mut *rx)? {
-                SendInitiation(peer) => tx_maybe_with!(peer, || self
-                    .crypt
-                    .initiate_handshake(peer.lower(), &mut *tx))?,
-                SendRetransmission(peer) => tx_maybe_with!(peer, || self
-                    .crypt
-                    .retransmit_handshake(peer.lower(), &mut *tx))?,
-                DeleteKey(peer) => self.output_key(peer, Stale, &SymKey::random())?,
-
-                ReceivedMessage(len, addr) => {
-                    multimatch!(self.crypt.handle_msg(&rx[..len], &mut *tx),
-                        Err(ref e) =>
-                            self.verbose().then(||
-                                info!("error processing incoming message from {:?}: {:?} {}", addr, e, e.backtrace())),
-
-                        Ok(HandleMsgResult { resp: Some(len), .. }) => {
-                            self.sock.send_to(&tx[0..len], addr)?
-                        },
-
-                        Ok(HandleMsgResult { exchanged_with: Some(p), .. }) => {
-                            let ap = AppPeerPtr::lift(p);
-                            ap.get_app_mut(self).tx_addr = Some(addr);
-                            // TODO: Maybe we should rather call the key "rosenpass output"?
-                            self.output_key(ap, Exchanged, &self.crypt.osk(p)?)?;
-                        }
-                    );
-                }
-            };
-        }
-    }
-
-    pub fn output_key(&self, peer: AppPeerPtr, why: KeyOutputReason, key: &SymKey) -> Result<()> {
-        let peerid = peer.lower().get(&self.crypt).pidt()?;
-        let ap = peer.get_app(self);
-
-        if self.verbose() {
-            let msg = match why {
-                KeyOutputReason::Exchanged => "Exchanged key with peer",
-                KeyOutputReason::Stale => "Erasing outdated key from peer",
-            };
-            info!("{} {}", msg, fmt_b64(&*peerid));
-        }
-
-        if let Some(of) = ap.outfile.as_ref() {
-            // This might leave some fragments of the secret on the stack;
-            // in practice this is likely not a problem because the stack likely
-            // will be overwritten by something else soon but this is not exactly
-            // guaranteed. It would be possible to remedy this, but since the secret
-            // data will linger in the linux page cache anyways with the current
-            // implementation, going to great length to erase the secret here is
-            // not worth it right now.
-            b64_writer(fopen_w(of)?).write_all(key.secret())?;
-            let why = match why {
-                KeyOutputReason::Exchanged => "exchanged",
-                KeyOutputReason::Stale => "stale",
-            };
-            println!(
-                "output-key peer {} key-file {} {}",
-                fmt_b64(&*peerid),
-                of,
-                why
-            );
-        }
-
-        if let Some(owg) = ap.outwg.as_ref() {
-            let child = Command::new("wg")
-                .arg("set")
-                .arg(&owg.dev)
-                .arg("peer")
-                .arg(&owg.pk)
-                .arg("preshared-key")
-                .arg("/dev/stdin")
-                .stdin(Stdio::piped())
-                .args(&owg.extra_params)
-                .spawn()?;
-            b64_writer(child.stdin.unwrap()).write_all(key.secret())?;
-        }
-
-        Ok(())
-    }
-
-    pub fn poll(&mut self, rx_buf: &mut [u8]) -> Result<AppPollResult> {
-        use rosenpass::protocol::PollResult as C;
-        use AppPollResult as A;
-        loop {
-            return Ok(match self.crypt.poll()? {
-                C::DeleteKey(PeerPtr(no)) => A::DeleteKey(AppPeerPtr(no)),
-                C::SendInitiation(PeerPtr(no)) => A::SendInitiation(AppPeerPtr(no)),
-                C::SendRetransmission(PeerPtr(no)) => A::SendRetransmission(AppPeerPtr(no)),
-                C::Sleep(timeout) => match self.try_recv(rx_buf, timeout)? {
-                    Some((len, addr)) => A::ReceivedMessage(len, addr),
-                    None => continue,
-                },
-            });
-        }
-    }
-
-    pub fn try_recv(&self, buf: &mut [u8], timeout: Timing) -> Result<Option<(usize, SocketAddr)>> {
-        if timeout == 0.0 {
-            return Ok(None);
-        }
-        self.sock
-            .set_read_timeout(Some(Duration::from_secs_f64(timeout)))?;
-        match self.sock.recv_from(buf) {
-            Ok(x) => Ok(Some(x)),
-            Err(e) => match e.kind() {
-                ErrorKind::WouldBlock => Ok(None),
-                ErrorKind::TimedOut => Ok(None),
-                _ => Err(anyhow::Error::new(e)),
-            },
-        }
-    }
-}

src/msgs.rs

@@ -1,384 +0,0 @@
-//! # Messages
-//!
-//! This module contains data structures that help in the
-//! serialization/deserialization (ser/de) of messages. Thats kind of a lie,
-//! since no actual ser/de happens. Instead, the structures offer views into
-//! mutable byte slices (`&mut [u8]`), allowing to modify the fields of an
-//! always serialized instance of the data in question. This is closely related
-//! to the concept of lenses in function programming; more on that here:
-//! [https://sinusoid.es/misc/lager/lenses.pdf](https://sinusoid.es/misc/lager/lenses.pdf)
-//!
-//! # Example
-//!
-//! The following example uses the [`data_lense` macro](crate::data_lense) to create a lense that
-//! might be useful when dealing with UDP headers.
-//!
-//! ```
-//! use rosenpass::{data_lense, RosenpassError, msgs::LenseView};
-//! # fn main() -> Result<(), RosenpassError> {
-//!
-//! data_lense! {UdpDatagramHeader :=
-//!     source_port: 2,
-//!     dest_port: 2,
-//!     length: 2,
-//!     checksum: 2
-//! }
-//!
-//! let mut buf = [0u8; 8];
-//!
-//! // read-only lense, no check of size:
-//! let lense = UdpDatagramHeader(&buf);
-//! assert_eq!(lense.checksum(), &[0, 0]);
-//!
-//! // mutable lense, runtime check of size
-//! let mut lense = buf.as_mut().udp_datagram_header()?;
-//! lense.source_port_mut().copy_from_slice(&53u16.to_be_bytes()); // some DNS, anyone?
-//!
-//! // the original buffer is still available
-//! assert_eq!(buf, [0, 53, 0, 0, 0, 0, 0, 0]);
-//!
-//! // read-only lense, runtime check of size
-//! let lense = buf.as_ref().udp_datagram_header()?;
-//! assert_eq!(lense.source_port(), &[0, 53]);
-//! # Ok(())
-//! # }
-//! ```
-
-use super::RosenpassError;
-use crate::{pqkem::*, sodium};
-
-// Macro magic ////////////////////////////////////////////////////////////////
-
-/// A macro to create data lenses. Refer to the [`msgs` mod](crate::msgs) for
-/// an example and further elaboration
-// TODO implement TryFrom<[u8]> and From<[u8; Self::len()]>
-#[macro_export]
-macro_rules! data_lense(
-    // prefix          @ offset       ; optional meta    ; field name   : field length, ...
-    (token_muncher_ref @ $offset:expr ; $( $attr:meta )* ; $field:ident : $len:expr $(, $( $tail:tt )+ )?) =>  {
-        ::paste::paste!{
-
-        #[allow(rustdoc::broken_intra_doc_links)]
-        $( #[ $attr ] )*
-        ///
-        #[doc = data_lense!(maybe_docstring_link $len)]
-        /// bytes long
-        pub fn $field(&self) -> &__ContainerType::Output {
-            &self.0[$offset .. $offset + $len]
-        }
-
-        /// The bytes until the
-        #[doc = data_lense!(maybe_docstring_link Self::$field)]
-        /// field
-        pub fn [< until_ $field >](&self) -> &__ContainerType::Output {
-            &self.0[0 .. $offset]
-        }
-
-        // if the tail exits, consume it as well
-        $(
-        data_lense!{token_muncher_ref @ $offset + $len ; $( $tail )+ }
-        )?
-        }
-    };
-
-    // prefix          @ offset       ; optional meta    ; field name   : field length, ...
-    (token_muncher_mut @ $offset:expr ; $( $attr:meta )* ; $field:ident : $len:expr $(, $( $tail:tt )+ )?) =>  {
-        ::paste::paste!{
-
-        #[allow(rustdoc::broken_intra_doc_links)]
-        $( #[ $attr ] )*
-        ///
-        #[doc = data_lense!(maybe_docstring_link $len)]
-        /// bytes long
-        pub fn [< $field _mut >](&mut self) -> &mut __ContainerType::Output {
-            &mut self.0[$offset .. $offset + $len]
-        }
-
-        // if the tail exits, consume it as well
-        $(
-        data_lense!{token_muncher_mut @ $offset + $len ; $( $tail )+ }
-        )?
-        }
-    };
-
-    // switch that yields literals unchanged, but creates docstring links to
-    // constants
-    // TODO the doc string link doesn't work if $x is taken from a generic,
-    (maybe_docstring_link $x:literal) => (stringify!($x));
-    (maybe_docstring_link $x:expr) => (stringify!([$x]));
-
-    // struct name  < optional generics     >    := optional doc string      field name   : field length, ...
-    ($type:ident $( < $( $generic:ident ),+ > )? := $( $( #[ $attr:meta ] )* $field:ident : $len:expr ),+) => (::paste::paste!{
-
-        #[allow(rustdoc::broken_intra_doc_links)]
-        /// A data lense to manipulate byte slices.
-        ///
-        //// # Fields
-        ///
-        $(
-        /// - `
-        #[doc = stringify!($field)]
-        /// `:
-        #[doc = data_lense!(maybe_docstring_link $len)]
-        /// bytes
-        )+
-        pub struct $type<__ContainerType $(, $( $generic ),+ )? > (
-            __ContainerType,
-            // The phantom data is required, since all generics declared on a
-            // type need to be used on the type.
-            // https://doc.rust-lang.org/stable/error_codes/E0392.html
-            $( $( ::core::marker::PhantomData<$generic> ),+ )?
-        );
-
-        impl<__ContainerType $(, $( $generic: LenseView ),+ )? > $type<__ContainerType $(, $( $generic ),+ )? >{
-            $(
-            /// Size in bytes of the field `
-            #[doc = !($field)]
-            /// `
-            pub const fn [< $field _len >]() -> usize{
-                $len
-            }
-            )+
-
-            /// Verify that `len` is sufficiently long to hold [Self]
-            pub fn check_size(len: usize) -> Result<(), RosenpassError>{
-                let required_size = $( $len + )+ 0;
-                let actual_size = len;
-                if required_size < actual_size {
-                    Err(RosenpassError::BufferSizeMismatch {
-                        required_size,
-                        actual_size,
-                    })
-                }else{
-                    Ok(())
-                }
-            }
-        }
-
-        // read-only accessor functions
-        impl<'a, __ContainerType $(, $( $generic: LenseView ),+ )?> $type<&'a __ContainerType $(, $( $generic ),+ )?>
-        where
-            __ContainerType: std::ops::Index<std::ops::Range<usize>> + ?Sized,
-        {
-            data_lense!{token_muncher_ref @ 0 ; $( $( $attr )* ; $field : $len ),+ }
-
-            /// View into all bytes belonging to this Lense
-            pub fn all_bytes(&self) -> &__ContainerType::Output {
-                &self.0[0..Self::LEN]
-            }
-        }
-
-        // mutable accessor functions
-        impl<'a, __ContainerType $(, $( $generic: LenseView ),+ )?> $type<&'a mut __ContainerType $(, $( $generic ),+ )?>
-        where
-            __ContainerType: std::ops::IndexMut<std::ops::Range<usize>> + ?Sized,
-        {
-            data_lense!{token_muncher_ref @ 0 ; $( $( $attr )* ; $field : $len ),+ }
-            data_lense!{token_muncher_mut @ 0 ; $( $( $attr )* ; $field : $len ),+ }
-
-            /// View into all bytes belonging to this Lense
-            pub fn all_bytes(&self) -> &__ContainerType::Output {
-                &self.0[0..Self::LEN]
-            }
-
-            /// View into all bytes belonging to this Lense
-            pub fn all_bytes_mut(&mut self) -> &mut __ContainerType::Output {
-                &mut self.0[0..Self::LEN]
-            }
-        }
-
-        // lense trait, allowing us to know the implementing lenses size
-        impl<__ContainerType $(, $( $generic: LenseView ),+ )? > LenseView for $type<__ContainerType $(, $( $generic ),+ )? >{
-            /// Number of bytes required to store this type in binary format
-            const LEN: usize = $( $len + )+ 0;
-        }
-
-        /// Extension trait to allow checked creation of a lense over
-        /// some byte slice that contains a
-        #[doc = data_lense!(maybe_docstring_link $type)]
-        pub trait [< $type Ext >] {
-            type __ContainerType;
-
-            /// Create a lense to the byte slice
-            fn [< $type:snake >] $(< $($generic),* >)? (self) -> Result< $type<Self::__ContainerType, $( $($generic),+ )? >, RosenpassError>;
-        }
-
-        impl<'a> [< $type Ext >] for &'a [u8] {
-            type __ContainerType = &'a [u8];
-
-            fn [< $type:snake >] $(< $($generic),* >)? (self) -> Result< $type<Self::__ContainerType, $( $($generic),+ )? >, RosenpassError> {
-                Ok($type ( self, $( $( ::core::marker::PhantomData::<$generic>  ),+ )? ))
-            }
-        }
-
-        impl<'a> [< $type Ext >] for &'a mut [u8] {
-            type __ContainerType = &'a mut [u8];
-
-            fn [< $type:snake >] $(< $($generic),* >)? (self) -> Result< $type<Self::__ContainerType, $( $($generic),+ )? >, RosenpassError> {
-                Ok($type ( self, $( $( ::core::marker::PhantomData::<$generic>  ),+ )? ))
-            }
-        }
-    });
-);
-
-/// Common trait shared by all Lenses
-pub trait LenseView {
-    const LEN: usize;
-}
-
-data_lense! { Envelope<M> :=
-    /// [MsgType] of this message
-    msg_type: 1,
-    /// Reserved for future use
-    reserved: 3,
-    /// The actual Paylod
-    payload: M::LEN,
-    /// Message Authentication Code (mac) over all bytes until (exclusive)
-    /// `mac` itself
-    mac: sodium::MAC_SIZE,
-    /// Currently unused, TODO: do something with this
-    cookie: sodium::MAC_SIZE
-}
-
-data_lense! { InitHello :=
-    /// Randomly generated connection id
-    sidi: 4,
-    /// Kyber 512 Ephemeral Public Key
-    epki: EKEM::PK_LEN,
-    /// Classic McEliece Ciphertext
-    sctr: SKEM::CT_LEN,
-    /// Encryped: 16 byte hash of McEliece initiator static key
-    pidic: sodium::AEAD_TAG_LEN + 32,
-    /// Encrypted TAI64N Time Stamp (against replay attacks)
-    auth: sodium::AEAD_TAG_LEN
-}
-
-data_lense! { RespHello :=
-    /// Randomly generated connection id
-    sidr: 4,
-    /// Copied from InitHello
-    sidi: 4,
-    /// Kyber 512 Ephemeral Ciphertext
-    ecti: EKEM::CT_LEN,
-    /// Classic McEliece Ciphertext
-    scti: SKEM::CT_LEN,
-    /// Empty encrypted message (just an auth tag)
-    auth: sodium::AEAD_TAG_LEN,
-    /// Responders handshake state in encrypted form
-    biscuit: BISCUIT_CT_LEN
-}
-
-data_lense! { InitConf :=
-    /// Copied from InitHello
-    sidi: 4,
-    /// Copied from RespHello
-    sidr: 4,
-    /// Responders handshake state in encrypted form
-    biscuit: BISCUIT_CT_LEN,
-    /// Empty encrypted message (just an auth tag)
-    auth: sodium::AEAD_TAG_LEN
-}
-
-data_lense! { EmptyData :=
-    /// Copied from RespHello
-    sid: 4,
-    /// Nonce
-    ctr: 8,
-    /// Empty encrypted message (just an auth tag)
-    auth: sodium::AEAD_TAG_LEN
-}
-
-data_lense! { Biscuit :=
-    /// H(spki) – Ident ifies the initiator
-    pidi: sodium::KEY_SIZE,
-    /// The biscuit number (replay protection)
-    biscuit_no: 12,
-    /// Chaining key
-    ck: sodium::KEY_SIZE
-}
-
-data_lense! { DataMsg :=
-    dummy: 4
-}
-
-data_lense! { CookieReply :=
-    dummy: 4
-}
-
-// Traits /////////////////////////////////////////////////////////////////////
-
-pub trait WireMsg: std::fmt::Debug {
-    const MSG_TYPE: MsgType;
-    const MSG_TYPE_U8: u8 = Self::MSG_TYPE as u8;
-    const BYTES: usize;
-}
-
-// Constants //////////////////////////////////////////////////////////////////
-
-pub const SESSION_ID_LEN: usize = 4;
-pub const BISCUIT_ID_LEN: usize = 12;
-
-pub const WIRE_ENVELOPE_LEN: usize = 1 + 3 + 16 + 16; // TODO verify this
-
-/// Size required to fit any message in binary form
-pub const MAX_MESSAGE_LEN: usize = 2500; // TODO fix this
-
-/// Recognized message types
-#[repr(u8)]
-#[derive(Hash, PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Copy)]
-pub enum MsgType {
-    InitHello = 0x81,
-    RespHello = 0x82,
-    InitConf = 0x83,
-    EmptyData = 0x84,
-    DataMsg = 0x85,
-    CookieReply = 0x86,
-}
-
-impl TryFrom<u8> for MsgType {
-    type Error = RosenpassError;
-
-    fn try_from(value: u8) -> Result<Self, Self::Error> {
-        Ok(match value {
-            0x81 => MsgType::InitHello,
-            0x82 => MsgType::RespHello,
-            0x83 => MsgType::InitConf,
-            0x84 => MsgType::EmptyData,
-            0x85 => MsgType::DataMsg,
-            0x86 => MsgType::CookieReply,
-            _ => return Err(RosenpassError::InvalidMessageType(value)),
-        })
-    }
-}
-
-/// length in bytes of an unencrypted Biscuit (plain text)
-pub const BISCUIT_PT_LEN: usize = Biscuit::<()>::LEN;
-
-/// Length in bytes of an encrypted Biscuit (cipher text)
-pub const BISCUIT_CT_LEN: usize = BISCUIT_PT_LEN + sodium::XAEAD_NONCE_LEN + sodium::XAEAD_TAG_LEN;
-
-#[cfg(test)]
-mod test_constants {
-    use crate::{
-        msgs::{BISCUIT_CT_LEN, BISCUIT_PT_LEN},
-        sodium,
-    };
-
-    #[test]
-    fn sodium_keysize() {
-        assert_eq!(sodium::KEY_SIZE, 32);
-    }
-
-    #[test]
-    fn biscuit_pt_len() {
-        assert_eq!(BISCUIT_PT_LEN, 2 * sodium::KEY_SIZE + 12);
-    }
-
-    #[test]
-    fn biscuit_ct_len() {
-        assert_eq!(
-            BISCUIT_CT_LEN,
-            BISCUIT_PT_LEN + sodium::XAEAD_NONCE_LEN + sodium::XAEAD_TAG_LEN
-        );
-    }
-}

src/pqkem.rs

@@ -1,176 +0,0 @@
-//! This module contains Traits and implementations for Key Encapsulation
-//! Mechanisms (KEM). KEMs are the interface provided by almost all post-quantum
-//! secure key exchange mechanisms.
-//!
-//! Conceptually KEMs are akin to public-key encryption, but instead of encrypting
-//! arbitrary data, KEMs are limited to the transmission of keys, randomly chosen during
-//!
-//! encapsulation.
-//! The [KEM] Trait describes the basic API offered by a Key Encapsulation
-//! Mechanism. Two implementations for it are provided, [SKEM] and [EKEM].
-
-use crate::{RosenpassError, RosenpassMaybeError};
-
-/// Key Encapsulation Mechanism
-///
-/// The KEM interface defines three operations: Key generation, key encapsulation and key
-/// decapsulation.
-pub trait KEM {
-    /// Secrete Key length
-    const SK_LEN: usize;
-    /// Public Key length
-    const PK_LEN: usize;
-    /// Ciphertext length
-    const CT_LEN: usize;
-    /// Shared Secret length
-    const SHK_LEN: usize;
-
-    /// Generate a keypair consisting of secret key (`sk`) and public key (`pk`)
-    ///
-    /// `keygen() -> sk, pk`
-    fn keygen(sk: &mut [u8], pk: &mut [u8]) -> Result<(), RosenpassError>;
-
-    /// From a public key (`pk`), generate a shared key (`shk`, for local use)
-    /// and a cipher text (`ct`, to be sent to the owner of the `pk`).
-    ///
-    /// `encaps(pk) -> shk, ct`
-    fn encaps(shk: &mut [u8], ct: &mut [u8], pk: &[u8]) -> Result<(), RosenpassError>;
-
-    /// From a secret key (`sk`) and a cipher text (`ct`) derive a shared key
-    /// (`shk`)
-    ///
-    /// `decaps(sk, ct) -> shk`
-    fn decaps(shk: &mut [u8], sk: &[u8], ct: &[u8]) -> Result<(), RosenpassError>;
-}
-
-/// A KEM that is secure against Chosen Ciphertext Attacks (CCA).
-/// In the context of rosenpass this is used for static keys.
-/// Uses [Classic McEliece](https://classic.mceliece.org/) 460896 from liboqs.
-///
-/// Classic McEliece is chosen because of its high security margin and its small
-/// ciphertexts. The public keys are humongous, but (being static keys) the are never transmitted over
-/// the wire so this is not a big problem.
-pub struct SKEM;
-
-/// # Safety
-///
-/// This Trait impl calls unsafe [oqs_sys] functions, that write to byte
-/// slices only identified using raw pointers. It must be ensured that the raw
-/// pointers point into byte slices of sufficient length, to avoid UB through
-/// overwriting of arbitrary data. This is checked in the following code before
-/// the unsafe calls, and an early return with an Err occurs if the byte slice
-/// size does not match the required size.
-///
-/// __Note__: This requirement is stricter than necessary, it would suffice
-/// to only check that the buffers are big enough, allowing them to be even
-/// bigger. However, from a correctness point of view it does not make sense to
-/// allow bigger buffers.
-impl KEM for SKEM {
-    const SK_LEN: usize = oqs_sys::kem::OQS_KEM_classic_mceliece_460896_length_secret_key as usize;
-    const PK_LEN: usize = oqs_sys::kem::OQS_KEM_classic_mceliece_460896_length_public_key as usize;
-    const CT_LEN: usize = oqs_sys::kem::OQS_KEM_classic_mceliece_460896_length_ciphertext as usize;
-    const SHK_LEN: usize =
-        oqs_sys::kem::OQS_KEM_classic_mceliece_460896_length_shared_secret as usize;
-
-    fn keygen(sk: &mut [u8], pk: &mut [u8]) -> Result<(), RosenpassError> {
-        RosenpassError::check_buffer_size(sk.len(), Self::SK_LEN)?;
-        RosenpassError::check_buffer_size(pk.len(), Self::PK_LEN)?;
-        unsafe {
-            oqs_sys::kem::OQS_KEM_classic_mceliece_460896_keypair(pk.as_mut_ptr(), sk.as_mut_ptr())
-                .to_rg_error()
-        }
-    }
-
-    fn encaps(shk: &mut [u8], ct: &mut [u8], pk: &[u8]) -> Result<(), RosenpassError> {
-        RosenpassError::check_buffer_size(shk.len(), Self::SHK_LEN)?;
-        RosenpassError::check_buffer_size(ct.len(), Self::CT_LEN)?;
-        RosenpassError::check_buffer_size(pk.len(), Self::PK_LEN)?;
-        unsafe {
-            oqs_sys::kem::OQS_KEM_classic_mceliece_460896_encaps(
-                ct.as_mut_ptr(),
-                shk.as_mut_ptr(),
-                pk.as_ptr(),
-            )
-            .to_rg_error()
-        }
-    }
-
-    fn decaps(shk: &mut [u8], sk: &[u8], ct: &[u8]) -> Result<(), RosenpassError> {
-        RosenpassError::check_buffer_size(shk.len(), Self::SHK_LEN)?;
-        RosenpassError::check_buffer_size(sk.len(), Self::SK_LEN)?;
-        RosenpassError::check_buffer_size(ct.len(), Self::CT_LEN)?;
-        unsafe {
-            oqs_sys::kem::OQS_KEM_classic_mceliece_460896_decaps(
-                shk.as_mut_ptr(),
-                ct.as_ptr(),
-                sk.as_ptr(),
-            )
-            .to_rg_error()
-        }
-    }
-}
-
-/// Implements a KEM that is secure against Chosen Plaintext Attacks (CPA).
-/// In the context of rosenpass this is used for ephemeral keys.
-/// Currently the implementation uses
-/// [Kyber 512](https://openquantumsafe.org/liboqs/algorithms/kem/kyber) from liboqs.
-///
-/// This is being used for ephemeral keys; since these are use-once the first post quantum
-/// wireguard paper claimed that CPA security would be sufficient. Nonetheless we choose kyber
-/// which provides CCA security since there are no publicly vetted KEMs out there which provide
-/// only CPA security.
-pub struct EKEM;
-
-/// # Safety
-///
-/// This Trait impl calls unsafe [oqs_sys] functions, that write to byte
-/// slices only identified using raw pointers. It must be ensured that the raw
-/// pointers point into byte slices of sufficient length, to avoid UB through
-/// overwriting of arbitrary data. This is checked in the following code before
-/// the unsafe calls, and an early return with an Err occurs if the byte slice
-/// size does not match the required size.
-///
-/// __Note__: This requirement is stricter than necessary, it would suffice
-/// to only check that the buffers are big enough, allowing them to be even
-/// bigger. However, from a correctness point of view it does not make sense to
-/// allow bigger buffers.
-impl KEM for EKEM {
-    const SK_LEN: usize = oqs_sys::kem::OQS_KEM_kyber_512_length_secret_key as usize;
-    const PK_LEN: usize = oqs_sys::kem::OQS_KEM_kyber_512_length_public_key as usize;
-    const CT_LEN: usize = oqs_sys::kem::OQS_KEM_kyber_512_length_ciphertext as usize;
-    const SHK_LEN: usize = oqs_sys::kem::OQS_KEM_kyber_512_length_shared_secret as usize;
-    fn keygen(sk: &mut [u8], pk: &mut [u8]) -> Result<(), RosenpassError> {
-        RosenpassError::check_buffer_size(sk.len(), Self::SK_LEN)?;
-        RosenpassError::check_buffer_size(pk.len(), Self::PK_LEN)?;
-        unsafe {
-            oqs_sys::kem::OQS_KEM_kyber_512_keypair(pk.as_mut_ptr(), sk.as_mut_ptr())
-                .to_rg_error()
-        }
-    }
-    fn encaps(shk: &mut [u8], ct: &mut [u8], pk: &[u8]) -> Result<(), RosenpassError> {
-        RosenpassError::check_buffer_size(shk.len(), Self::SHK_LEN)?;
-        RosenpassError::check_buffer_size(ct.len(), Self::CT_LEN)?;
-        RosenpassError::check_buffer_size(pk.len(), Self::PK_LEN)?;
-        unsafe {
-            oqs_sys::kem::OQS_KEM_kyber_512_encaps(
-                ct.as_mut_ptr(),
-                shk.as_mut_ptr(),
-                pk.as_ptr(),
-            )
-            .to_rg_error()
-        }
-    }
-    fn decaps(shk: &mut [u8], sk: &[u8], ct: &[u8]) -> Result<(), RosenpassError> {
-        RosenpassError::check_buffer_size(shk.len(), Self::SHK_LEN)?;
-        RosenpassError::check_buffer_size(sk.len(), Self::SK_LEN)?;
-        RosenpassError::check_buffer_size(ct.len(), Self::CT_LEN)?;
-        unsafe {
-            oqs_sys::kem::OQS_KEM_kyber_512_decaps(
-                shk.as_mut_ptr(),
-                ct.as_ptr(),
-                sk.as_ptr(),
-            )
-            .to_rg_error()
-        }
-    }
-}