chore: update Cargo.lock

Documentation and unit tests

.prettierignore

@@ -1,4 +1,5 @@
 .direnv/
+flake.lock
 papers/whitepaper.md
-target/
 src/usage.md
+target/

Cargo.toml

@@ -47,7 +47,7 @@ memsec = { git = "https://github.com/rosenpass/memsec.git", rev = "aceb9baee8aec
 rand = "0.8.5"
 typenum = "1.17.0"
 log = { version = "0.4.22" }
-clap = { version = "4.5.19", features = ["derive"] }
+clap = { version = "4.5.20", features = ["derive"] }
 serde = { version = "1.0.210", features = ["derive"] }
 arbitrary = { version = "1.3.2", features = ["derive"] }
 anyhow = { version = "1.0.89", features = ["backtrace", "std"] }

constant-time/src/compare.rs

@@ -1,7 +1,15 @@
+//! Constant-time comparison
+
 use core::ptr;
 
 /// Little endian memcmp version of quinier/memsec
 /// https://github.com/quininer/memsec/blob/bbc647967ff6d20d6dccf1c85f5d9037fcadd3b0/src/lib.rs#L30
+///
+/// # Panic & Safety
+///
+/// Both input arrays must be at least of the indicated length.
+///
+/// See [std::ptr::read_volatile] on safety.
 #[inline(never)]
 pub unsafe fn memcmp_le(b1: *const u8, b2: *const u8, len: usize) -> i32 {
     let mut res = 0;
@@ -13,6 +21,16 @@ pub unsafe fn memcmp_le(b1: *const u8, b2: *const u8, len: usize) -> i32 {
     ((res - 1) >> 8) + (res >> 8) + 1
 }
 
+#[test]
+pub fn memcmp_le_test() {
+    // use rosenpass_constant_time::memcmp_le;
+    let a = [0, 1, 0, 0];
+    let b = [0, 0, 0, 1];
+    assert_eq!(-1, unsafe { memcmp_le(a.as_ptr(), b.as_ptr(), 4) });
+    assert_eq!(0, unsafe { memcmp_le(a.as_ptr(), a.as_ptr(), 4) });
+    assert_eq!(1, unsafe { memcmp_le(b.as_ptr(), a.as_ptr(), 4) });
+}
+
 /// compares two slices of memory content and returns an integer indicating the relationship between
 /// the slices
 ///
@@ -32,6 +50,28 @@ pub unsafe fn memcmp_le(b1: *const u8, b2: *const u8, len: usize) -> i32 {
 /// ## Tests
 /// For discussion on how to ensure the constant-time execution of this function, see
 /// <https://github.com/rosenpass/rosenpass/issues/232>
+///
+/// # Examples
+///
+/// ```rust
+/// use rosenpass_constant_time::compare;
+/// let a = [0, 1, 0, 0];
+/// let b = [0, 0, 0, 1];
+/// assert_eq!(-1, compare(&a, &b));
+/// assert_eq!(0, compare(&a, &a));
+/// assert_eq!(1, compare(&b, &a));
+/// ```
+///
+/// # Panic
+///
+/// This function will panic if the input arrays are of different lengths.
+///
+/// ```should_panic
+/// use rosenpass_constant_time::compare;
+/// let a = [0, 1, 0];
+/// let b = [0, 0, 0, 1];
+/// compare(&a, &b);
+/// ```
 #[inline]
 pub fn compare(a: &[u8], b: &[u8]) -> i32 {
     assert!(a.len() == b.len());

constant-time/src/increment.rs

@@ -1,3 +1,5 @@
+//! Incrementing numbers
+
 use core::hint::black_box;
 
 /// Interpret the given slice as a little-endian unsigned integer

constant-time/src/lib.rs

@@ -1,3 +1,5 @@
+#![warn(missing_docs)]
+#![warn(clippy::missing_docs_in_private_items)]
 //! constant-time implementations of some primitives
 //!
 //! Rosenpass internal library providing basic constant-time operations.

constant-time/src/memcmp.rs

@@ -1,3 +1,5 @@
+//! memcmp
+
 /// compares two sclices of memory content and returns whether they are equal
 ///
 /// ## Leaks
@@ -7,6 +9,18 @@
 ///
 /// The execution time of the function grows approx. linear with the length of the input. This is
 /// considered safe.
+///
+/// ## Examples
+///
+/// ```rust
+/// use rosenpass_constant_time::memcmp;
+/// let a = [0, 0, 0, 0];
+/// let b = [0, 0, 0, 1];
+/// let c = [0, 0, 0];
+/// assert!(memcmp(&a, &a));
+/// assert!(!memcmp(&a, &b));
+/// assert!(!memcmp(&a, &c));
+/// ```
 #[inline]
 pub fn memcmp(a: &[u8], b: &[u8]) -> bool {
     a.len() == b.len() && unsafe { memsec::memeq(a.as_ptr(), b.as_ptr(), a.len()) }

constant-time/src/xor.rs

@@ -1,3 +1,5 @@
+//! xor
+
 use core::hint::black_box;
 use rosenpass_to::{with_destination, To};
 

flake.lock

@@ -2,15 +2,17 @@
   "nodes": {
     "fenix": {
       "inputs": {
-        "nixpkgs": ["nixpkgs"],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1712298178,
-        "narHash": "sha256-590fpCPXYAkaAeBz/V91GX4/KGzPObdYtqsTWzT6AhI=",
+        "lastModified": 1728282832,
+        "narHash": "sha256-I7AbcwGggf+CHqpyd/9PiAjpIBGTGx5woYHqtwxaV7I=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "569b5b5781395da08e7064e825953c548c26af76",
+        "rev": "1ec71be1f4b8f3105c5d38da339cb061fefc43f4",
         "type": "github"
       },
       "original": {
@@ -24,11 +26,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1710146030,
-        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
         "type": "github"
       },
       "original": {
@@ -37,36 +39,18 @@
         "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": 1712168706,
-        "narHash": "sha256-XP24tOobf6GGElMd0ux90FEBalUtw6NkBSVh/RlA6ik=",
+        "lastModified": 1728193676,
+        "narHash": "sha256-PbDWAIjKJdlVg+qQRhzdSor04bAPApDqIv2DofTyynk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1487bdea619e4a7a53a4590c475deabb5a9d1bfb",
+        "rev": "ecbc1ca8ffd6aea8372ad16be9ebbb39889e55b6",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.11",
+        "ref": "nixos-24.05",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -75,18 +59,17 @@
       "inputs": {
         "fenix": "fenix",
         "flake-utils": "flake-utils",
-        "naersk": "naersk",
         "nixpkgs": "nixpkgs"
       }
     },
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1712156296,
-        "narHash": "sha256-St7ZQrkrr5lmQX9wC1ZJAFxL8W7alswnyZk9d1se3Us=",
+        "lastModified": 1728249780,
+        "narHash": "sha256-J269DvCI5dzBmPrXhAAtj566qt0b22TJtF3TIK+tMsI=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "8e581ac348e223488622f4d3003cb2bd412bf27e",
+        "rev": "2b750da1a1a2c1d2c70896108d7096089842d877",
         "type": "github"
       },
       "original": {

flake.nix

@@ -1,12 +1,8 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
     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";
@@ -15,6 +11,15 @@
   outputs = { self, nixpkgs, flake-utils, ... }@inputs:
     nixpkgs.lib.foldl (a: b: nixpkgs.lib.recursiveUpdate a b) { } [
 
+
+      #
+      ### Export the overlay.nix from this flake ###
+      #
+      {
+        overlays.default = import ./overlay.nix;
+      }
+
+
       #
       ### Actual Rosenpass Package and Docker Container Images ###
       #
@@ -30,310 +35,39 @@
       ]
         (system:
           let
-            scoped = (scope: scope.result);
-            lib = nixpkgs.lib;
-
             # normal nixpkgs
             pkgs = import nixpkgs {
               inherit system;
-            };
 
-            # parsed Cargo.toml
-            cargoToml = builtins.fromTOML (builtins.readFile ./rosenpass/Cargo.toml);
-
-            # source files relevant for rust
-            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 ".${ext}" basename) extensions)
-                  (any (file: file == relative) files)
-                ];
-              });
-
-              result = pkgs.lib.sources.cleanSourceWith { inherit src filter; };
-            };
-
-            # a function to generate a nix derivation for rosenpass against any
-            # given set of nixpkgs
-            rosenpassDerivation = p:
-              let
-                # whether we want to build a statically linked binary
-                isStatic = p.targetPlatform.isStatic;
-
-                # the rust target of `p`
-                target = p.rust.toRustTargetSpec p.targetPlatform;
-
-                # convert a string to shout case
-                shout = string: builtins.replaceStrings [ "-" ] [ "_" ] (pkgs.lib.toUpper string);
-
-                # suitable Rust toolchain
-                toolchain = with inputs.fenix.packages.${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;
-                };
-
-                # used to trick the build.rs into believing that CMake was ran **again**
-                fakecmake = pkgs.writeScriptBin "cmake" ''
-                  #! ${pkgs.stdenv.shell} -e
-                  true
-                '';
-              in
-              naersk.buildPackage
-                {
-                  # metadata and source
-                  name = cargoToml.package.name;
-                  version = cargoToml.package.version;
-                  inherit src;
-
-                  cargoBuildOptions = x: x ++ [ "-p" "rosenpass" ];
-                  cargoTestOptions = x: x ++ [ "-p" "rosenpass" ];
-
-                  doCheck = true;
-
-                  nativeBuildInputs = with pkgs; [
-                    p.stdenv.cc
-                    cmake # for oqs build in the oqs-sys crate
-                    mandoc # for the built-in manual
-                    removeReferencesTo
-                    rustPlatform.bindgenHook # for C-bindings in the crypto libs
-                  ];
-                  buildInputs = with p; [ bash ];
-
-                  override = x: {
-                    preBuild =
-                      # nix defaults to building for aarch64 _without_ the armv8-a crypto
-                      # extensions, but liboqs depens on these
-                      (lib.optionalString (system == "aarch64-linux") ''
-                        NIX_CFLAGS_COMPILE="$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="$NIX_CFLAGS_COMPILE -lc"
-                    '');
-                  };
-
-                  # We want to build for a specific target...
-                  CARGO_BUILD_TARGET = target;
-
-                  # ... which might require a non-default linker:
-                  "CARGO_TARGET_${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;
-
-                # tell rust to build everything statically linked
-                CARGO_BUILD_RUSTFLAGS = "-C target-feature=+crt-static";
-              });
-            # a function to generate a nix derivation for the rp helper against any
-            # given set of nixpkgs
-            rpDerivation = p:
-              let
-                # 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;
-                };
-
-                # used to trick the build.rs into believing that CMake was ran **again**
-                fakecmake = pkgs.writeScriptBin "cmake" ''
-                  #! ${pkgs.stdenv.shell} -e
-                  true
-                '';
-              in
-              naersk.buildPackage
-                {
-                  # metadata and source
-                  name = cargoToml.package.name;
-                  version = cargoToml.package.version;
-                  inherit src;
-
-                  cargoBuildOptions = x: x ++ [ "-p" "rp" ];
-                  cargoTestOptions = x: x ++ [ "-p" "rp" ];
-
-                  doCheck = true;
-
-                  nativeBuildInputs = with pkgs; [
-                    p.stdenv.cc
-                    cmake # for oqs build in the oqs-sys crate
-                    mandoc # for the built-in manual
-                    removeReferencesTo
-                    rustPlatform.bindgenHook # for C-bindings in the crypto libs
-                  ];
-                  buildInputs = with p; [ bash ];
-
-                  override = x: {
-                    preBuild =
-                      # nix defaults to building for aarch64 _without_ the armv8-a crypto
-                      # extensions, but liboqs depens on these
-                      (lib.optionalString (system == "aarch64-linux") ''
-                        NIX_CFLAGS_COMPILE="$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="$NIX_CFLAGS_COMPILE -lc"
-                    '');
-                  };
-
-                  # We want to build for a specific target...
-                  CARGO_BUILD_TARGET = target;
-
-                  # ... which might require a non-default linker:
-                  "CARGO_TARGET_${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;
-
-                # 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;
-              copyToRoot = pkgs.buildEnv {
-                name = "image-root";
-                paths = [ self.packages.${system}.${name} ];
-                pathsToLink = [ "/bin" ];
-              };
-              config.Cmd = [ "/bin/rosenpass" ];
+              # apply our own overlay, overriding/inserting our packages as defined in ./pkgs
+              overlays = [ self.overlays.default ];
             };
           in
-          rec {
-            packages = rec {
-              default = rosenpass;
-              rosenpass = rosenpassDerivation pkgs;
-              rp = rpDerivation pkgs;
-              rosenpass-oci-image = rosenpassOCI "rosenpass";
+          {
+            packages = {
+              default = pkgs.rosenpass;
+              rosenpass = pkgs.rosenpass;
+              rosenpass-oci-image = pkgs.rosenpass-oci-image;
+              rp = pkgs.rp;
 
-              # derivation for the release
-              release-package =
-                let
-                  version = cargoToml.package.version;
-                  package =
-                    if pkgs.hostPlatform.isLinux then
-                      packages.rosenpass-static
-                    else packages.rosenpass;
-                  rp =
-                    if pkgs.hostPlatform.isLinux then
-                      packages.rp-static
-                    else packages.rp;
-                  oci-image =
-                    if pkgs.hostPlatform.isLinux then
-                      packages.rosenpass-static-oci-image
-                    else packages.rosenpass-oci-image;
-                in
-                pkgs.runCommandNoCC "lace-result" { }
-                  ''
-                    mkdir {bin,$out}
-                    tar -cvf $out/rosenpass-${system}-${version}.tar \
-                      -C ${package} bin/rosenpass \
-                      -C ${rp} bin/rp
-                    cp ${oci-image} \
-                      $out/rosenpass-oci-image-${system}-${version}.tar.gz
-                  '';
-            } // (if pkgs.stdenv.isLinux then rec {
-              rosenpass-static = rosenpassDerivation pkgs.pkgsStatic;
-              rp-static = rpDerivation pkgs.pkgsStatic;
-              rosenpass-static-oci-image = rosenpassOCI "rosenpass-static";
-            } else { });
+              release-package = pkgs.release-package;
+
+              # for good measure, we also offer to cross compile to Linux on Arm
+              aarch64-linux-rosenpass-static =
+                pkgs.pkgsCross.aarch64-multiplatform.pkgsStatic.rosenpass;
+              aarch64-linux-rp-static = pkgs.pkgsCross.aarch64-multiplatform.pkgsStatic.rp;
+            }
+            //
+            # We only offer static builds for linux, as this is not supported on OS X
+            (nixpkgs.lib.attrsets.optionalAttrs pkgs.stdenv.isLinux {
+              rosenpass-static = pkgs.pkgsStatic.rosenpass;
+              rosenpass-static-oci-image = pkgs.pkgsStatic.rosenpass-oci-image;
+              rp-static = pkgs.pkgsStatic.rp;
+            });
           }
         ))
 
+
       #
       ### Linux specifics ###
       #
@@ -341,88 +75,46 @@
         let
           pkgs = import nixpkgs {
             inherit system;
+
+            # apply our own overlay, overriding/inserting our packages as defined in ./pkgs
+            overlays = [ self.overlays.default ];
           };
-          packages = self.packages.${system};
         in
         {
-          #
-          ### Whitepaper ###
-          #
-          packages.whitepaper =
-            let
-              tlsetup = (pkgs.texlive.combine {
-                inherit (pkgs.texlive) scheme-basic acmart amsfonts ccicons
-                  csquotes csvsimple doclicense fancyvrb fontspec gobble
-                  koma-script ifmtarg latexmk lm markdown mathtools minted noto
-                  nunito pgf soul unicode-math lualatex-math paralist
-                  gitinfo2 eso-pic biblatex biblatex-trad biblatex-software
-                  xkeyval xurl xifthen biber;
-              });
-            in
-            pkgs.stdenvNoCC.mkDerivation {
-              name = "whitepaper";
-              src = ./papers;
-              nativeBuildInputs = with pkgs; [
-                ncurses # tput
-                python3Packages.pygments
-                tlsetup # custom tex live scheme
-                which
-              ];
-              buildPhase = ''
-                export HOME=$(mktemp -d)
-                latexmk -r tex/CI.rc
-              '';
-              installPhase = ''
-                mkdir -p $out
-                mv *.pdf readme.md $out/
-              '';
-            };
 
+          #
+          ### Reading materials ###
+          #
+          packages.whitepaper = pkgs.whitepaper;
 
           #
           ### Proof and Proof Tools ###
           #
-          packages.proverif-patched = pkgs.proverif.overrideAttrs (old: {
-            postInstall = ''
-              install -D -t $out/lib cryptoverif.pvl
-            '';
-          });
-          packages.proof-proverif = pkgs.stdenv.mkDerivation {
-            name = "rosenpass-proverif-proof";
-            version = "unstable";
-            src = pkgs.lib.sources.sourceByRegex ./. [
-              "analyze.sh"
-              "marzipan(/marzipan.awk)?"
-              "analysis(/.*)?"
-            ];
-            nativeBuildInputs = [ pkgs.proverif pkgs.graphviz ];
-            CRYPTOVERIF_LIB = packages.proverif-patched + "/lib/cryptoverif.pvl";
-            installPhase = ''
-              mkdir -p $out
-              bash analyze.sh -color -html $out
-            '';
-          };
+          packages.proverif-patched = pkgs.proverif-patched;
+          packages.proof-proverif = pkgs.proof-proverif;
 
 
           #
           ### Devshells ###
           #
           devShells.default = pkgs.mkShell {
-            inherit (packages.proof-proverif) CRYPTOVERIF_LIB;
-            inputsFrom = [ packages.default ];
+            inherit (pkgs.proof-proverif) CRYPTOVERIF_LIB;
+            inputsFrom = [ pkgs.rosenpass ];
             nativeBuildInputs = with pkgs; [
-              inputs.fenix.packages.${system}.complete.toolchain
-              cmake # override the fakecmake from the main step above
               cargo-release
               clippy
+              rustfmt
               nodePackages.prettier
               nushell # for the .ci/gen-workflow-files.nu script
-              packages.proverif-patched
+              proverif-patched
             ];
           };
           devShells.coverage = pkgs.mkShell {
-            inputsFrom = [ packages.default ];
-            nativeBuildInputs = with pkgs; [ inputs.fenix.packages.${system}.complete.toolchain cargo-llvm-cov ];
+            inputsFrom = [ pkgs.rosenpass ];
+            nativeBuildInputs = [
+              inputs.fenix.packages.${system}.complete.toolchain
+              pkgs.cargo-llvm-cov
+            ];
           };
 
 

oqs/Cargo.toml

@@ -14,3 +14,7 @@ rosenpass-cipher-traits = { workspace = true }
 rosenpass-util = { workspace = true }
 oqs-sys = { workspace = true }
 paste = { workspace = true }
+
+[dev-dependencies]
+rosenpass-secret-memory = { workspace = true }
+rosenpass-constant-time = { workspace = true }

oqs/src/kem_macro.rs

@@ -1,9 +1,42 @@
+//! Generic helpers for declaring bindings to liboqs kems
+
+/// Generate bindings to a liboqs-provided KEM
 macro_rules! oqs_kem {
     ($name:ident) => { ::paste::paste!{
+        #[doc = "Bindings for ::oqs_sys::kem::" [<"OQS_KEM" _ $name:snake>] "_*"]
         mod [< $name:snake >] {
             use rosenpass_cipher_traits::Kem;
             use rosenpass_util::result::Guaranteed;
 
+            #[doc = "Bindings for ::oqs_sys::kem::" [<"OQS_KEM" _ $name:snake>] "_*"]
+            #[doc = ""]
+            #[doc = "# Examples"]
+            #[doc = ""]
+            #[doc = "```rust"]
+            #[doc = "use std::borrow::{Borrow, BorrowMut};"]
+            #[doc = "use rosenpass_cipher_traits::Kem;"]
+            #[doc = "use rosenpass_oqs::" $name:camel " as MyKem;"]
+            #[doc = "use rosenpass_secret_memory::{Secret, Public};"]
+            #[doc = ""]
+            #[doc = "rosenpass_secret_memory::secret_policy_try_use_memfd_secrets();"]
+            #[doc = ""]
+            #[doc = "// Recipient generates secret key, transfers pk to sender"]
+            #[doc = "let mut sk = Secret::<{ MyKem::SK_LEN }>::zero();"]
+            #[doc = "let mut pk = Public::<{ MyKem::PK_LEN }>::zero();"]
+            #[doc = "MyKem::keygen(sk.secret_mut(), pk.borrow_mut());"]
+            #[doc = ""]
+            #[doc = "// Sender generates ciphertext and local shared key, sends ciphertext to recipient"]
+            #[doc = "let mut shk_enc = Secret::<{ MyKem::SHK_LEN }>::zero();"]
+            #[doc = "let mut ct = Public::<{ MyKem::CT_LEN }>::zero();"]
+            #[doc = "MyKem::encaps(shk_enc.secret_mut(), ct.borrow_mut(), pk.borrow());"]
+            #[doc = ""]
+            #[doc = "// Recipient decapsulates ciphertext"]
+            #[doc = "let mut shk_dec = Secret::<{ MyKem::SHK_LEN }>::zero();"]
+            #[doc = "MyKem::decaps(shk_dec.secret_mut(), sk.secret(), ct.borrow());"]
+            #[doc = ""]
+            #[doc = "// Both parties end up with the same shared key"]
+            #[doc = "assert!(rosenpass_constant_time::compare(shk_enc.secret_mut(), shk_dec.secret_mut()) == 0);"]
+            #[doc = "```"]
             pub enum [< $name:camel >]  {}
 
             /// # Panic & Safety

oqs/src/lib.rs

@@ -1,3 +1,8 @@
+#![warn(missing_docs)]
+#![warn(clippy::missing_docs_in_private_items)]
+//! Bindings for liboqs used in Rosenpass
+
+/// Call into a libOQS function
 macro_rules! oqs_call {
     ($name:path, $($args:expr),*) => {{
         use oqs_sys::common::OQS_STATUS::*;

overlay.nix

@@ -0,0 +1,39 @@
+final: prev: {
+
+
+  #
+  ### Actual rosenpass software ###
+  #
+  rosenpass = final.callPackage ./pkgs/rosenpass.nix { };
+  rosenpass-oci-image = final.callPackage ./pkgs/rosenpass-oci-image.nix { };
+  rp = final.callPackage ./pkgs/rosenpass.nix { package = "rp"; };
+
+  release-package = final.callPackage ./pkgs/release-package.nix { };
+
+  #
+  ### Appendix ###
+  #
+  proverif-patched = prev.proverif.overrideAttrs (old: {
+    postInstall = ''
+      install -D -t $out/lib cryptoverif.pvl
+    '';
+  });
+
+  proof-proverif = final.stdenv.mkDerivation {
+    name = "rosenpass-proverif-proof";
+    version = "unstable";
+    src = final.lib.sources.sourceByRegex ./. [
+      "analyze.sh"
+      "marzipan(/marzipan.awk)?"
+      "analysis(/.*)?"
+    ];
+    nativeBuildInputs = [ final.proverif final.graphviz ];
+    CRYPTOVERIF_LIB = final.proverif-patched + "/lib/cryptoverif.pvl";
+    installPhase = ''
+      mkdir -p $out
+      bash analyze.sh -color -html $out
+    '';
+  };
+
+  whitepaper = final.callPackage ./pkgs/whitepaper.nix { };
+}

pkgs/release-package.nix

@@ -0,0 +1,27 @@
+{ lib, stdenvNoCC, runCommandNoCC, pkgsStatic, rosenpass, rosenpass-oci-image, rp } @ args:
+
+let
+  version = rosenpass.version;
+
+  # select static packages on Linux, default packages otherwise
+  package =
+    if stdenvNoCC.hostPlatform.isLinux then
+      pkgsStatic.rosenpass
+    else args.rosenpass;
+  rp =
+    if stdenvNoCC.hostPlatform.isLinux then
+      pkgsStatic.rp
+    else args.rp;
+  oci-image =
+    if stdenvNoCC.hostPlatform.isLinux then
+      pkgsStatic.rosenpass-oci-image
+    else args.rosenpass-oci-image;
+in
+runCommandNoCC "lace-result" { } ''
+  mkdir {bin,$out}
+  tar -cvf $out/rosenpass-${stdenvNoCC.hostPlatform.system}-${version}.tar \
+    -C ${package} bin/rosenpass \
+    -C ${rp} bin/rp
+  cp ${oci-image} \
+    $out/rosenpass-oci-image-${stdenvNoCC.hostPlatform.system}-${version}.tar.gz
+''

pkgs/rosenpass-oci-image.nix

@@ -0,0 +1,11 @@
+{ dockerTools, buildEnv, rosenpass }:
+
+dockerTools.buildImage {
+  name = rosenpass.name + "-oci";
+  copyToRoot = buildEnv {
+    name = "image-root";
+    paths = [ rosenpass ];
+    pathsToLink = [ "/bin" ];
+  };
+  config.Cmd = [ "/bin/rosenpass" ];
+}

pkgs/rosenpass.nix

@@ -0,0 +1,78 @@
+{ lib, stdenv, rustPlatform, cmake, mandoc, removeReferencesTo, bash, package ? "rosenpass" }:
+
+let
+  # whether we want to build a statically linked binary
+  isStatic = stdenv.targetPlatform.isStatic;
+
+  scoped = (scope: scope.result);
+
+  # source files relevant for rust
+  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 = lib.sources.cleanSourceWith { inherit src filter; };
+  };
+
+  # parsed Cargo.toml
+  cargoToml = builtins.fromTOML (builtins.readFile (src + "/rosenpass/Cargo.toml"));
+in
+rustPlatform.buildRustPackage {
+  name = cargoToml.package.name;
+  version = cargoToml.package.version;
+  inherit src;
+
+  cargoBuildOptions = [ "--package" package ];
+  cargoTestOptions = [ "--package" package ];
+
+  doCheck = true;
+
+  cargoLock = {
+    lockFile = src + "/Cargo.lock";
+    outputHashes = {
+      "memsec-0.6.3" = "sha256-4ri+IEqLd77cLcul3lZrmpDKj4cwuYJ8oPRAiQNGeLw=";
+      "uds-0.4.2" = "sha256-qlxr/iJt2AV4WryePIvqm/8/MK/iqtzegztNliR93W8=";
+    };
+  };
+
+  nativeBuildInputs = [
+    stdenv.cc
+    cmake # for oqs build in the oqs-sys crate
+    mandoc # for the built-in manual
+    removeReferencesTo
+    rustPlatform.bindgenHook # for C-bindings in the crypto libs
+  ];
+  buildInputs = [ bash ];
+
+  hardeningDisable = lib.optional isStatic "fortify";
+
+  meta = {
+    inherit (cargoToml.package) description homepage;
+    license = with lib.licenses; [ mit asl20 ];
+    maintainers = [ lib.maintainers.wucke13 ];
+    platforms = lib.platforms.all;
+  };
+}

pkgs/whitepaper.nix

@@ -0,0 +1,29 @@
+{ stdenvNoCC, texlive, ncurses, python3Packages, which }:
+
+let
+  customTexLiveSetup = (texlive.combine {
+    inherit (texlive) acmart amsfonts biber biblatex biblatex-software
+      biblatex-trad ccicons csquotes csvsimple doclicense eso-pic fancyvrb
+      fontspec gitinfo2 gobble ifmtarg koma-script latexmk lm lualatex-math
+      markdown mathtools minted noto nunito paralist pgf scheme-basic soul
+      unicode-math upquote xifthen xkeyval xurl;
+  });
+in
+stdenvNoCC.mkDerivation {
+  name = "whitepaper";
+  src = ../papers;
+  nativeBuildInputs = [
+    ncurses # tput
+    python3Packages.pygments
+    customTexLiveSetup # custom tex live scheme
+    which
+  ];
+  buildPhase = ''
+    export HOME=$(mktemp -d)
+    latexmk -r tex/CI.rc
+  '';
+  installPhase = ''
+    mkdir -p $out
+    mv *.pdf readme.md $out/
+  '';
+}

rosenpass/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rosenpass"
-version = "0.2.1"
+version = "0.3.0-dev"
 authors = ["Karolin Varner <karo@cupdev.net>", "wucke13 <wucke13@gmail.com>"]
 edition = "2021"
 license = "MIT OR Apache-2.0"

rosenpass/src/app_server.rs

@@ -154,7 +154,6 @@ pub struct AppServerTest {
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 pub enum AppServerIoSource {
     Socket(usize),
-    #[cfg(feature = "experiment_api")]
     PskBroker(Public<BROKER_ID_BYTES>),
     #[cfg(feature = "experiment_api")]
     MioManager(crate::api::mio::MioManagerIoSource),
@@ -1209,15 +1208,12 @@ impl AppServer {
         buf: &mut [u8],
         io_source: AppServerIoSource,
     ) -> anyhow::Result<Option<(usize, Endpoint)>> {
-        use crate::api::mio::MioManagerContext;
-
         match io_source {
             AppServerIoSource::Socket(idx) => self
                 .try_recv_from_listen_socket(buf, idx)
                 .substitute_for_ioerr_wouldblock(None)?
                 .ok(),
 
-            #[cfg(feature = "experiment_api")]
             AppServerIoSource::PskBroker(key) => self
                 .brokers
                 .store
@@ -1227,9 +1223,13 @@ impl AppServer {
                 .map(|_| None),
 
             #[cfg(feature = "experiment_api")]
-            AppServerIoSource::MioManager(mmio_src) => MioManagerFocus(self)
-                .poll_particular(mmio_src)
-                .map(|_| None),
+            AppServerIoSource::MioManager(mmio_src) => {
+                use crate::api::mio::MioManagerContext;
+
+                MioManagerFocus(self)
+                    .poll_particular(mmio_src)
+                    .map(|_| None)
+            }
         }
     }
 

util/src/b64.rs

@@ -1,8 +1,13 @@
+//! Utilities for working with Base64
+
 use base64ct::{Base64, Decoder as B64Reader, Encoder as B64Writer};
 use zeroize::Zeroize;
 
 use std::fmt::Display;
 
+/// Formatter that displays its input as base64.
+///
+/// Use through [B64Display].
 pub struct B64DisplayHelper<'a, const F: usize>(&'a [u8]);
 
 impl<const F: usize> Display for B64DisplayHelper<'_, F> {
@@ -15,7 +20,25 @@ impl<const F: usize> Display for B64DisplayHelper<'_, F> {
     }
 }
 
+/// Extension trait that can be used to display values as Base64
+///
+/// # Examples
+///
+/// ```
+/// use rosenpass_util::b64::B64Display;
+///
+/// let a = vec![0,1,2,3,4,5];
+/// assert_eq!(
+///   format!("{}", a.fmt_b64::<10>()), // Maximum size of the encoded buffer
+///   "AAECAwQF",
+/// );
+/// ```
 pub trait B64Display {
+    /// Display this value as base64
+    ///
+    /// # Examples
+    ///
+    /// See [B64Display].
     fn fmt_b64<const F: usize>(&self) -> B64DisplayHelper<F>;
 }
 
@@ -31,6 +54,11 @@ impl<T: AsRef<[u8]>> B64Display for T {
     }
 }
 
+/// Decode a base64-encoded value
+///
+/// # Examples
+///
+/// See [b64_encode].
 pub fn b64_decode(input: &[u8], output: &mut [u8]) -> anyhow::Result<()> {
     let mut reader = B64Reader::<Base64>::new(input).map_err(|e| anyhow::anyhow!(e))?;
     match reader.decode(output) {
@@ -49,6 +77,23 @@ pub fn b64_decode(input: &[u8], output: &mut [u8]) -> anyhow::Result<()> {
     }
 }
 
+/// Encode a value as base64.
+///
+/// ```
+/// use rosenpass_util::b64::{b64_encode, b64_decode};
+///
+/// let bytes = b"Hello World";
+///
+/// let mut encoder_buffer = [0u8; 64];
+/// let encoded = b64_encode(bytes, &mut encoder_buffer)?;
+///
+/// let mut bytes_decoded = [0u8; 11];
+/// b64_decode(encoded.as_bytes(), &mut bytes_decoded);
+/// assert_eq!(bytes, &bytes_decoded);
+///
+/// Ok::<(), anyhow::Error>(())
+/// ```
+///
 pub fn b64_encode<'o>(input: &[u8], output: &'o mut [u8]) -> anyhow::Result<&'o str> {
     let mut writer = B64Writer::<Base64>::new(output).map_err(|e| anyhow::anyhow!(e))?;
     writer.encode(input).map_err(|e| anyhow::anyhow!(e))?;

util/src/build.rs

@@ -1,33 +1,163 @@
+//! Lazy construction of values
+
 use crate::{
     functional::ApplyExt,
     mem::{SwapWithDefaultExt, SwapWithExt},
 };
 
-#[derive(thiserror::Error, Debug)]
+/// Errors returned by [ConstructionSite::erect]
+#[derive(thiserror::Error, Debug, Eq, PartialEq)]
 pub enum ConstructionSiteErectError<E> {
+    /// Attempted to erect an empty construction site
     #[error("Construction site is void")]
     IsVoid,
+    /// Attempted to erect a construction that is already standing
     #[error("Construction is already built")]
     AlreadyBuilt,
+    /// Other error
     #[error("Other construction site error {0:?}")]
     Other(#[from] E),
 }
 
+/// A type that can build some other type
+///
+/// # Examples
+///
+/// ```
+/// use rosenpass_util::build::Build;
+/// use anyhow::{Context, Result};
+///
+/// #[derive(Eq, PartialEq, Debug)]
+/// struct Person {
+///     pub fav_pokemon: String,
+///     pub fav_number: u8,
+/// }
+///
+/// #[derive(Default, Clone)]
+/// struct PersonBuilder {
+///     pub fav_pokemon: Option<String>,
+///     pub fav_number: Option<u8>,
+/// }
+///
+/// impl Build<Person> for &PersonBuilder {
+///     type Error = anyhow::Error;
+///
+///     fn build(self) -> Result<Person, Self::Error> {
+///         let fav_pokemon = self.fav_pokemon.clone().context("Missing fav pokemon")?;
+///         let fav_number = self.fav_number.context("Missing fav number")?;
+///         Ok(Person {
+///             fav_pokemon,
+///             fav_number,
+///         })
+///     }
+/// }
+///
+/// let mut person_builder = PersonBuilder::default();
+/// assert!(person_builder.build().is_err());
+///
+/// person_builder.fav_pokemon = Some("Krabby".to_owned());
+/// person_builder.fav_number = Some(0);
+/// assert_eq!(
+///     person_builder.build().unwrap(),
+///     Person {
+///         fav_pokemon: "Krabby".to_owned(),
+///         fav_number: 0
+///     }
+/// );
+/// ```
 pub trait Build<T>: Sized {
+    /// Error returned by the builder
     type Error;
+    /// Build the type
+    ///
+    /// # Examples
+    ///
+    /// See [Self].
     fn build(self) -> Result<T, Self::Error>;
 }
 
-#[derive(Debug)]
+/// A type that can be incrementally built from a type that can [Build] it
+///
+/// This is similar to an option, where [Self::Void] is [std::Option::None],
+/// [Self::Product] is [std::Option::Some], except that there is a third
+/// intermediate state [Self::Builder] that represents a Some/Product value
+/// in the process of being made.
+///
+/// # Examples
+///
+/// ```
+/// use std::borrow::Borrow;
+/// use rosenpass_util::build::{ConstructionSite, Build};
+/// use anyhow::{Context, Result};
+///
+/// #[derive(Eq, PartialEq, Debug)]
+/// struct Person {
+///     pub fav_pokemon: String,
+///     pub fav_number: u8,
+/// }
+///
+/// #[derive(Eq, PartialEq, Default, Clone, Debug)]
+/// struct PersonBuilder {
+///     pub fav_pokemon: Option<String>,
+///     pub fav_number: Option<u8>,
+/// }
+///
+/// impl Build<Person> for &PersonBuilder {
+///     type Error = anyhow::Error;
+///
+///     fn build(self) -> Result<Person, Self::Error> {
+///         let fav_pokemon = self.fav_pokemon.clone().context("Missing fav pokemon")?;
+///         let fav_number = self.fav_number.context("Missing fav number")?;
+///         Ok(Person {
+///             fav_pokemon,
+///             fav_number,
+///         })
+///     }
+/// }
+///
+/// impl Build<Person> for PersonBuilder {
+///     type Error = anyhow::Error;
+///
+///     fn build(self) -> Result<Person, Self::Error> {
+///          self.borrow().build()
+///     }
+/// }
+///
+/// // Allocate the construction site
+/// let mut site = ConstructionSite::void();
+///
+/// // Start construction
+/// site = ConstructionSite::Builder(PersonBuilder::default());
+///
+/// // Use the builder to build the value
+/// site.builder_mut().unwrap().fav_pokemon = Some("Krabby".to_owned());
+/// site.builder_mut().unwrap().fav_number = Some(0);
+///
+/// // Use `erect` to call Build::build
+/// site.erect();
+///
+/// assert_eq!(
+///     site,
+///     ConstructionSite::Product(Person {
+///         fav_pokemon: "Krabby".to_owned(),
+///         fav_number: 0
+///     }),
+/// );
+/// ```
+#[derive(Debug, Eq, PartialEq, Clone)]
 pub enum ConstructionSite<Builder, T>
 where
     Builder: Build<T>,
 {
+    /// The site is empty
     Void,
+    /// The site is being built
     Builder(Builder),
+    /// The site has been built and is now finished
     Product(T),
 }
 
+/// Initializes the construction site as [ConstructionSite::Void]
 impl<Builder, T> Default for ConstructionSite<Builder, T>
 where
     Builder: Build<T>,
@@ -41,22 +171,189 @@ impl<Builder, T> ConstructionSite<Builder, T>
 where
     Builder: Build<T>,
 {
+    /// Initializes the construction site as [ConstructionSite::Void]
+    ///
+    /// # Examples
+    ///
+    /// See [Self].
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// assert_eq!(
+    ///     ConstructionSite::<Builder, House>::void(),
+    ///     ConstructionSite::Void,
+    /// );
+    /// ```
     pub fn void() -> Self {
         Self::Void
     }
 
+    /// Initialize the construction site from its builder
+    ///
+    /// # Examples
+    ///
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// assert_eq!(
+    ///     ConstructionSite::<Builder, House>::new(Builder),
+    ///     ConstructionSite::Builder(Builder),
+    /// );
+    /// ```
     pub fn new(builder: Builder) -> Self {
         Self::Builder(builder)
     }
 
+    /// Initialize the construction site from its product
+    ///
+    /// # Examples
+    ///
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// assert_eq!(
+    ///     ConstructionSite::<Builder, House>::from_product(House),
+    ///     ConstructionSite::Product(House),
+    /// );
+    /// ```
     pub fn from_product(value: T) -> Self {
         Self::Product(value)
     }
 
+    /// Extract the construction site and replace it with [Self::Void]
+    ///
+    /// # Examples
+    ///
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// let mut a = ConstructionSite::<Builder, House>::from_product(House);
+    /// let a_backup = a.clone();
+    ///
+    /// let b = a.take();
+    /// assert_eq!(a, ConstructionSite::void());
+    /// assert_eq!(b, ConstructionSite::Product(House));
+    /// ```
     pub fn take(&mut self) -> Self {
         self.swap_with_default()
     }
 
+    /// Apply the given function to Self, temporarily converting
+    /// the mutable reference into an owned value.
+    ///
+    /// This is useful if you have some function that needs to modify
+    /// the construction site as an owned value but all you have is a reference.
+    ///
+    /// # Examples
+    ///
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House(u32);
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder(u32);
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House(self.0))
+    ///     }
+    /// }
+    ///
+    /// #[derive(Debug, PartialEq, Eq)]
+    /// enum FancyMatchState {
+    ///     New,
+    ///     Built,
+    ///     Increment,
+    /// };
+    ///
+    /// fn fancy_match(site: &mut ConstructionSite<Builder, House>, def: u32) -> FancyMatchState {
+    ///      site.modify_taken_with_return(|site| {
+    ///          use ConstructionSite as C;
+    ///          use FancyMatchState as F;
+    ///          let (prod, state) = match site {
+    ///              C::Void              => (House(def), F::New),
+    ///              C::Builder(b)        => (b.build().unwrap(), F::Built),
+    ///              C::Product(House(v)) => (House(v + 1), F::Increment),
+    ///          };
+    ///          let prod = ConstructionSite::from_product(prod);
+    ///          (prod, state)
+    ///      })
+    /// }
+    ///
+    /// let mut a = ConstructionSite::void();
+    /// let r = fancy_match(&mut a, 42);
+    /// assert_eq!(a, ConstructionSite::Product(House(42)));
+    /// assert_eq!(r, FancyMatchState::New);
+    ///
+    /// let mut a = ConstructionSite::new(Builder(13));
+    /// let r = fancy_match(&mut a, 42);
+    /// assert_eq!(a, ConstructionSite::Product(House(13)));
+    /// assert_eq!(r, FancyMatchState::Built);
+    ///
+    /// let r = fancy_match(&mut a, 42);
+    /// assert_eq!(a, ConstructionSite::Product(House(14)));
+    /// assert_eq!(r, FancyMatchState::Increment);
+    /// ```
     pub fn modify_taken_with_return<R, F>(&mut self, f: F) -> R
     where
         F: FnOnce(Self) -> (Self, R),
@@ -66,6 +363,53 @@ where
         res
     }
 
+    /// Apply the given function to Self, temporarily converting
+    /// the mutable reference into an owned value.
+    ///
+    /// This is useful if you have some function that needs to modify
+    /// the construction site as an owned value but all you have is a reference.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House(u32);
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder(u32);
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House(self.0))
+    ///     }
+    /// }
+    ///
+    /// fn fancy_match(site: &mut ConstructionSite<Builder, House>, def: u32) {
+    ///      site.modify_taken(|site| {
+    ///          use ConstructionSite as C;
+    ///          let prod = match site {
+    ///              C::Void              => House(def),
+    ///              C::Builder(b)        => b.build().unwrap(),
+    ///              C::Product(House(v)) => House(v + 1),
+    ///          };
+    ///          ConstructionSite::from_product(prod)
+    ///      })
+    /// }
+    ///
+    /// let mut a = ConstructionSite::void();
+    /// fancy_match(&mut a, 42);
+    /// assert_eq!(a, ConstructionSite::Product(House(42)));
+    ///
+    /// let mut a = ConstructionSite::new(Builder(13));
+    /// fancy_match(&mut a, 42);
+    /// assert_eq!(a, ConstructionSite::Product(House(13)));
+    ///
+    /// fancy_match(&mut a, 42);
+    /// assert_eq!(a, ConstructionSite::Product(House(14)));
+    /// ```
     pub fn modify_taken<F>(&mut self, f: F)
     where
         F: FnOnce(Self) -> Self,
@@ -73,6 +417,42 @@ where
         self.take().apply(f).swap_with_mut(self)
     }
 
+    /// If this constructions site contains [Self::Builder], call the inner [Build]'s [Build::build]
+    /// and have the construction site contain a product.
+    ///
+    /// # Examples
+    ///
+    /// See [Self].
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build, ConstructionSiteErectError};
+    /// use std::convert::Infallible;
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = Infallible;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// let mut a = ConstructionSite::<Builder, House>::void();
+    /// assert_eq!(a.erect(), Err(ConstructionSiteErectError::IsVoid));
+    /// assert_eq!(a, ConstructionSite::void());
+    ///
+    /// let mut a = ConstructionSite::<Builder, House>::from_product(House);
+    /// assert_eq!(a.erect(), Err(ConstructionSiteErectError::AlreadyBuilt));
+    /// assert_eq!(a, ConstructionSite::from_product(House));
+    ///
+    /// let mut a = ConstructionSite::<Builder, House>::new(Builder);
+    /// a.erect().unwrap();
+    /// assert_eq!(a, ConstructionSite::from_product(House));
+    /// ```
     #[allow(clippy::result_unit_err)]
     pub fn erect(&mut self) -> Result<(), ConstructionSiteErectError<Builder::Error>> {
         self.modify_taken_with_return(|site| {
@@ -98,6 +478,31 @@ where
     /// Returns `true` if the construction site is [`Void`].
     ///
     /// [`Void`]: ConstructionSite::Void
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// type Site = ConstructionSite<Builder, House>;
+    ///
+    /// assert_eq!(Site::Void.is_void(), true);
+    /// assert_eq!(Site::Builder(Builder).is_void(), false);
+    /// assert_eq!(Site::Product(House).is_void(), false);
+    /// ```
     #[must_use]
     pub fn is_void(&self) -> bool {
         matches!(self, Self::Void)
@@ -106,19 +511,95 @@ where
     /// Returns `true` if the construction site is [`InProgress`].
     ///
     /// [`InProgress`]: ConstructionSite::InProgress
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// type Site = ConstructionSite<Builder, House>;
+    ///
+    /// assert_eq!(Site::Void.in_progress(), false);
+    /// assert_eq!(Site::Builder(Builder).in_progress(), true);
+    /// assert_eq!(Site::Product(House).in_progress(), false);
+    /// ```
     #[must_use]
-    pub fn in_progess(&self) -> bool {
+    pub fn in_progress(&self) -> bool {
         matches!(self, Self::Builder(..))
     }
 
     /// Returns `true` if the construction site is [`Done`].
     ///
     /// [`Done`]: ConstructionSite::Done
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// type Site = ConstructionSite<Builder, House>;
+    ///
+    /// assert_eq!(Site::Void.is_available(), false);
+    /// assert_eq!(Site::Builder(Builder).is_available(), false);
+    /// assert_eq!(Site::Product(House).is_available(), true);
+    /// ```
     #[must_use]
     pub fn is_available(&self) -> bool {
         matches!(self, Self::Product(..))
     }
 
+    /// Returns the value of [Self::Builder]
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use rosenpass_util::build::{ConstructionSite, Build};
+    ///
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct House;
+    /// #[derive(Debug, Eq, PartialEq, Clone, Copy)]
+    /// struct Builder;
+    ///
+    /// impl Build<House> for Builder {
+    ///     type Error = anyhow::Error;
+    ///
+    ///     fn build(self) -> Result<House, Self::Error> {
+    ///         Ok(House)
+    ///     }
+    /// }
+    ///
+    /// type Site = ConstructionSite<Builder, House>;
+    ///
+    /// assert_eq!(Site::Void.into_builder(), None);
+    /// assert_eq!(Site::Builder(Builder).into_builder(), Some(Builder));
+    /// assert_eq!(Site::Product(House).into_builder(), None);
+    /// ```
     pub fn into_builder(self) -> Option<Builder> {
         use ConstructionSite as S;
         match self {
@@ -127,6 +608,11 @@ where
         }
     }
 
+    /// Returns the value of [Self::Builder] as a reference
+    ///
+    /// # Examples
+    ///
+    /// See [Self::into_builder].
     pub fn builder_ref(&self) -> Option<&Builder> {
         use ConstructionSite as S;
         match self {
@@ -135,6 +621,11 @@ where
         }
     }
 
+    /// Returns the value of [Self::Builder] as a mutable reference
+    ///
+    /// # Examples
+    ///
+    /// Similar to [Self::into_builder].
     pub fn builder_mut(&mut self) -> Option<&mut Builder> {
         use ConstructionSite as S;
         match self {
@@ -143,6 +634,11 @@ where
         }
     }
 
+    /// Returns the value of [Self::Product]
+    ///
+    /// # Examples
+    ///
+    /// Similar to [Self::into_builder].
     pub fn into_product(self) -> Option<T> {
         use ConstructionSite as S;
         match self {
@@ -151,6 +647,11 @@ where
         }
     }
 
+    /// Returns the value of [Self::Product] as a reference
+    ///
+    /// # Examples
+    ///
+    /// Similar to [Self::into_builder].
     pub fn product_ref(&self) -> Option<&T> {
         use ConstructionSite as S;
         match self {
@@ -159,6 +660,11 @@ where
         }
     }
 
+    /// Returns the value of [Self::Product] as a mutable reference
+    ///
+    /// # Examples
+    ///
+    /// Similar to [Self::into_builder].
     pub fn product_mut(&mut self) -> Option<&mut T> {
         use ConstructionSite as S;
         match self {

util/src/lib.rs

@@ -1,3 +1,5 @@
+#![warn(missing_docs)]
+#![warn(clippy::missing_docs_in_private_items)]
 #![recursion_limit = "256"]
 
 pub mod b64;