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integrate simple rct api

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moneromooo-monero
2016-08-28 21:29:20 +01:00
parent 1e8d37e7d8
commit a4d4d6194b
11 changed files with 400 additions and 188 deletions
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src/ringct/rctSigs.cpp
+53 -31
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@@ -329,7 +329,7 @@ namespace rct {
// this shows that sum inputs = sum outputs
//Ver:
// verifies the above sig is created corretly
mgSig proveRctMG(const ctkeyM & pubs, const ctkeyV & inSk, const ctkeyV &outSk, const ctkeyV & outPk, unsigned int index, key txnFeeKey, const key &base_hash) {
mgSig proveRctMG(const key &message, const ctkeyM & pubs, const ctkeyV & inSk, const ctkeyV &outSk, const ctkeyV & outPk, unsigned int index, key txnFeeKey) {
mgSig mg;
//setup vars
size_t cols = pubs.size();
@@ -374,9 +374,9 @@ namespace rct {
sc_sub(sk[rows].bytes, sk[rows].bytes, outSk[j].mask.bytes); //subtract output masks in last row..
}
ctkeyV signed_data = outPk;
signed_data.push_back(ctkey({base_hash, identity()}));
key message = cn_fast_hash(signed_data);
return MLSAG_Gen(message, M, sk, index);
signed_data.push_back(ctkey({message, identity()}));
key msg = cn_fast_hash(signed_data);
return MLSAG_Gen(msg, M, sk, index);
}
@@ -415,7 +415,7 @@ namespace rct {
// this shows that sum inputs = sum outputs
//Ver:
// verifies the above sig is created corretly
bool verRctMG(mgSig mg, const keyV &II, const ctkeyM & pubs, const ctkeyV & outPk, key txnFeeKey, const key &base_hash) {
bool verRctMG(mgSig mg, const keyV &II, const ctkeyM & pubs, const ctkeyV & outPk, key txnFeeKey, const key &message) {
//setup vars
size_t cols = pubs.size();
CHECK_AND_ASSERT_MES(cols >= 1, false, "Empty pubs");
@@ -447,11 +447,11 @@ namespace rct {
subKeys(M[i][rows], M[i][rows], txnFeeKey);
}
ctkeyV signed_data = outPk;
signed_data.push_back(ctkey({base_hash, identity()}));
key message = cn_fast_hash(signed_data);
signed_data.push_back(ctkey({message, identity()}));
key msg = cn_fast_hash(signed_data);
DP("message:");
DP(message);
return MLSAG_Ver(message, M, mg, II);
DP(msg);
return MLSAG_Ver(msg, M, mg, II);
}
//Ring-ct Simple MG sigs
@@ -535,7 +535,7 @@ namespace rct {
// must know the destination private key to find the correct amount, else will return a random number
// Note: For txn fees, the last index in the amounts vector should contain that
// Thus the amounts vector will be "one" longer than the destinations vectort
rctSig genRct(const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> amounts, const ctkeyM &mixRing, const key &base_hash, unsigned int index) {
rctSig genRct(const key &message, const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> & amounts, const ctkeyM &mixRing, unsigned int index) {
CHECK_AND_ASSERT_THROW_MES(amounts.size() == destinations.size() || amounts.size() == destinations.size() + 1, "Different number of amounts/destinations");
CHECK_AND_ASSERT_THROW_MES(index < mixRing.size(), "Bad index into mixRing");
for (size_t n = 0; n < mixRing.size(); ++n) {
@@ -543,6 +543,7 @@ namespace rct {
}
rctSig rv;
rv.simple = false;
rv.outPk.resize(destinations.size());
rv.rangeSigs.resize(destinations.size());
rv.ecdhInfo.resize(destinations.size());
@@ -578,23 +579,22 @@ namespace rct {
key txnFeeKey = scalarmultH(d2h(rv.txnFee));
rv.mixRing = mixRing;
rv.base_hash = base_hash;
rv.MG = proveRctMG(rv.mixRing, inSk, outSk, rv.outPk, index, txnFeeKey, base_hash);
rv.message = message;
rv.MG = proveRctMG(message, rv.mixRing, inSk, outSk, rv.outPk, index, txnFeeKey);
return rv;
}
rctSig genRct(const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> amounts, const key &base_hash, const int mixin) {
rctSig genRct(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> & amounts, const int mixin) {
unsigned int index;
ctkeyM mixRing;
tie(mixRing, index) = populateFromBlockchain(inPk, mixin);
return genRct(inSk, destinations, amounts, mixRing, base_hash, index);
return genRct(message, inSk, destinations, amounts, mixRing, index);
}
//RCT simple
//for post-rct only
sRctSig genRctSimple(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const std::vector<unsigned int> & index) {
rctSig genRctSimple(const key &message, const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const std::vector<unsigned int> & index) {
CHECK_AND_ASSERT_THROW_MES(inamounts.size() > 0, "Empty inamounts");
CHECK_AND_ASSERT_THROW_MES(inPk.size() == inSk.size(), "Different number of inPk/inSk");
CHECK_AND_ASSERT_THROW_MES(inamounts.size() == inSk.size(), "Different number of inamounts/inSk");
CHECK_AND_ASSERT_THROW_MES(outamounts.size() == destinations.size(), "Different number of amounts/destinations");
CHECK_AND_ASSERT_THROW_MES(index.size() == inSk.size(), "Different number of index/inSk");
@@ -603,7 +603,8 @@ namespace rct {
CHECK_AND_ASSERT_THROW_MES(index[n] < mixRing[n].size(), "Bad index into mixRing");
}
sRctSig rv;
rctSig rv;
rv.simple = true;
rv.message = message;
rv.outPk.resize(destinations.size());
rv.rangeSigs.resize(destinations.size());
@@ -637,24 +638,24 @@ namespace rct {
// key txnFeeKey = scalarmultH(d2h(rv.txnFee));
rv.mixRing = mixRing;
rv.pseudoOuts.resize(inamounts.size());
rv.MG.resize(inamounts.size());
rv.MGs.resize(inamounts.size());
key sumpouts = zero(); //sum pseudoOut masks
key a;
for (i = 0 ; i < inamounts.size() - 1; i++) {
skGen(a);
sc_add(sumpouts.bytes, a.bytes, sumpouts.bytes);
genC(rv.pseudoOuts[i], a, inamounts[i]);
rv.MG[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
rv.MGs[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
}
rv.mixRing = mixRing;
sc_sub(a.bytes, sumout.bytes, sumpouts.bytes);
genC(rv.pseudoOuts[i], a, inamounts[i]);
DP(rv.pseudoOuts[i]);
rv.MG[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
rv.MGs[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
return rv;
}
sRctSig genRctSimple(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, unsigned int mixin) {
rctSig genRctSimple(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, unsigned int mixin) {
std::vector<unsigned int> index;
index.resize(inPk.size());
ctkeyM mixRing;
@@ -663,7 +664,7 @@ namespace rct {
mixRing[i].resize(mixin+1);
index[i] = populateFromBlockchainSimple(mixRing[i], inPk[i], mixin);
}
return genRctSimple(message, inSk, inPk, destinations, inamounts, outamounts, txnFee, mixRing, index);
return genRctSimple(message, inSk, destinations, inamounts, outamounts, txnFee, mixRing, index);
}
//RingCT protocol
@@ -676,7 +677,8 @@ namespace rct {
//decodeRct: (c.f. http://eprint.iacr.org/2015/1098 section 5.1.1)
// uses the attached ecdh info to find the amounts represented by each output commitment
// must know the destination private key to find the correct amount, else will return a random number
bool verRct(const rctSig & rv, const ctkeyM &mixRing, const keyV &II, const key &base_hash) {
bool verRct(const rctSig & rv, const ctkeyM &mixRing, const keyV &II, const key &message) {
CHECK_AND_ASSERT_MES(!rv.simple, false, "verRct called on simple rctSig");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.rangeSigs.size(), false, "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.ecdhInfo.size(), false, "Mismatched sizes of rv.outPk and rv.ecdhInfo");
@@ -694,7 +696,7 @@ namespace rct {
}
//compute txn fee
key txnFeeKey = scalarmultH(d2h(rv.txnFee));
bool mgVerd = verRctMG(rv.MG, II, mixRing, rv.outPk, txnFeeKey, base_hash);
bool mgVerd = verRctMG(rv.MG, II, mixRing, rv.outPk, txnFeeKey, message);
DP("mg sig verified?");
DP(mgVerd);
@@ -706,19 +708,28 @@ namespace rct {
}
}
bool verRct(const rctSig & rv) {
return verRct(rv, rv.mixRing, rv.MG.II, rv.base_hash);
return verRct(rv, rv.mixRing, rv.MG.II, rv.message);
}
//ver RingCT simple
//assumes only post-rct style inputs (at least for max anonymity)
bool verRctSimple(const sRctSig & rv) {
bool verRctSimple(const rctSig & rv, const ctkeyM &mixRing, const std::vector<keyV> *II, const key &message) {
size_t i = 0;
bool rvb = true;
CHECK_AND_ASSERT_MES(rv.simple, false, "verRctSimple called on non simple rctSig");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.rangeSigs.size(), false, "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.ecdhInfo.size(), false, "Mismatched sizes of rv.outPk and rv.ecdhInfo");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == rv.MGs.size(), false, "Mismatched sizes of rv.pseudoOuts and rv.MGs");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == rv.mixRing.size(), false, "Mismatched sizes of rv.pseudoOuts and rv.MGs");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == mixRing.size(), false, "Mismatched sizes of rv.pseudoOuts and mixRing");
CHECK_AND_ASSERT_MES(!II || II->size() == mixRing.size(), false, "Mismatched II/mixRing size");
if (II)
{
for (size_t n = 0; n < II->size(); ++n)
{
CHECK_AND_ASSERT_MES((*II)[n].size() == 2, false, "Bad II size");
}
}
key sumOutpks = identity();
for (i = 0; i < rv.outPk.size(); i++) {
@@ -733,8 +744,8 @@ namespace rct {
bool tmpb = false;
key sumPseudoOuts = identity();
for (i = 0 ; i < rv.mixRing.size() ; i++) {
tmpb = verRctMGSimple(rv.message, rv.MG[i], rv.MG[i].II, rv.mixRing[i], rv.pseudoOuts[i]);
for (i = 0 ; i < mixRing.size() ; i++) {
tmpb = verRctMGSimple(message, rv.MGs[i], II ? (*II)[i] : rv.MGs[i].II, mixRing[i], rv.pseudoOuts[i]);
addKeys(sumPseudoOuts, sumPseudoOuts, rv.pseudoOuts[i]);
DP(tmpb);
if (!tmpb) {
@@ -755,6 +766,10 @@ namespace rct {
return (rvb && mgVerd);
}
bool verRctSimple(const rctSig & rv) {
return verRctSimple(rv, rv.mixRing, NULL, rv.message);
}
//RingCT protocol
//genRct:
// creates an rctSig with all data necessary to verify the rangeProofs and that the signer owns one of the
@@ -766,6 +781,7 @@ namespace rct {
// uses the attached ecdh info to find the amounts represented by each output commitment
// must know the destination private key to find the correct amount, else will return a random number
xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, key & mask) {
CHECK_AND_ASSERT_MES(!rv.simple, false, "decodeRct called on simple rctSig");
CHECK_AND_ASSERT_THROW_MES(rv.rangeSigs.size() > 0, "Empty rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(rv.outPk.size() == rv.rangeSigs.size(), "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(i < rv.ecdhInfo.size(), "Bad index");
@@ -793,7 +809,8 @@ namespace rct {
return decodeRct(rv, sk, i, mask);
}
xmr_amount decodeRct(const sRctSig & rv, const key & sk, unsigned int i) {
xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, key &mask) {
CHECK_AND_ASSERT_MES(rv.simple, false, "decodeRct called on non simple rctSig");
CHECK_AND_ASSERT_THROW_MES(rv.rangeSigs.size() > 0, "Empty rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(rv.outPk.size() == rv.rangeSigs.size(), "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(i < rv.ecdhInfo.size(), "Bad index");
@@ -801,7 +818,7 @@ namespace rct {
//mask amount and mask
ecdhTuple ecdh_info = rv.ecdhInfo[i];
ecdhDecode(ecdh_info, sk);
key mask = ecdh_info.mask;
mask = ecdh_info.mask;
key amount = ecdh_info.amount;
key C = rv.outPk[i].mask;
DP("C");
@@ -815,4 +832,9 @@ namespace rct {
}
return h2d(amount);
}
xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i) {
key mask;
return decodeRctSimple(rv, sk, i, mask);
}
}