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bulletproofs: match aggregated verification to sarang's latest prototype

This commit is contained in:
moneromooo-monero 2018-08-06 10:09:46 +00:00
parent ce0c743205
commit c83012c476
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 39 additions and 64 deletions
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103
src/ringct/bulletproofs.cc
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@ -1029,6 +1029,8 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
rct::key Z2 = rct::identity();
rct::key z3 = rct::zero();
rct::keyV z4(maxMN, rct::zero()), z5(maxMN, rct::zero());
rct::key Y2 = rct::identity(), Y3 = rct::identity(), Y4 = rct::identity();
rct::key y0 = rct::zero(), y1 = rct::zero();
for (const Bulletproof *p: proofs)
{
const Bulletproof &proof = *p;
@ -1054,8 +1056,7 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
PERF_TIMER_START_BP(VERIFY_line_61);
// PAPER LINE 61
rct::key L61Left, L61Right;
rct::addKeys2(L61Left, proof.taux, proof.t, rct::H);
sc_muladd(y0.bytes, proof.taux.bytes, weight.bytes, y0.bytes);
const rct::keyV zpow = vector_powers(z, M+3);
@ -1069,64 +1070,26 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
}
PERF_TIMER_STOP(VERIFY_line_61);
// bos coster is slower for small numbers of calcs, straus seems not
if (1)
PERF_TIMER_START_BP(VERIFY_line_61rl_new);
sc_muladd(tmp.bytes, z.bytes, ip1y.bytes, k.bytes);
std::vector<MultiexpData> multiexp_data;
multiexp_data.reserve(proof.V.size());
sc_sub(tmp.bytes, proof.t.bytes, tmp.bytes);
sc_muladd(y1.bytes, tmp.bytes, weight.bytes, y1.bytes);
for (size_t j = 0; j < proof.V.size(); j++)
{
PERF_TIMER_START_BP(VERIFY_line_61rl_new);
sc_muladd(tmp.bytes, z.bytes, ip1y.bytes, k.bytes);
std::vector<MultiexpData> multiexp_data;
multiexp_data.reserve(3+proof.V.size());
multiexp_data.emplace_back(tmp, ge_p3_H);
for (size_t j = 0; j < proof.V.size(); j++)
{
multiexp_data.emplace_back(zpow[j+2], proof.V[j]);
}
multiexp_data.emplace_back(x, proof.T1);
rct::key xsq;
sc_mul(xsq.bytes, x.bytes, x.bytes);
multiexp_data.emplace_back(xsq, proof.T2);
L61Right = multiexp(multiexp_data, false);
PERF_TIMER_STOP(VERIFY_line_61rl_new);
multiexp_data.emplace_back(zpow[j+2], proof.V[j]);
}
else
{
PERF_TIMER_START_BP(VERIFY_line_61rl_old);
sc_muladd(tmp.bytes, z.bytes, ip1y.bytes, k.bytes);
L61Right = rct::scalarmultH(tmp);
ge_p3 L61Right_p3;
CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&L61Right_p3, L61Right.bytes) == 0, "ge_frombytes_vartime failed");
for (size_t j = 0; j+1 < proof.V.size(); j += 2)
{
CHECK_AND_ASSERT_MES(j+2+1 < zpow.size(), false, "invalid zpow index");
ge_dsmp precomp0, precomp1;
rct::precomp(precomp0, j < proof.V.size() ? proof.V[j] : rct::identity());
rct::precomp(precomp1, j+1 < proof.V.size() ? proof.V[j+1] : rct::identity());
rct::addKeys3acc_p3(&L61Right_p3, zpow[j+2], precomp0, zpow[j+2+1], precomp1);
}
for (size_t j = proof.V.size() & 0xfffffffe; j < M; j++)
{
CHECK_AND_ASSERT_MES(j+2 < zpow.size(), false, "invalid zpow index");
// faster equivalent to:
// tmp = rct::scalarmultKey(j < proof.V.size() ? proof.V[j] : rct::identity(), zpow[j+2]);
// rct::addKeys(L61Right, L61Right, tmp);
if (j < proof.V.size())
addKeys_acc_p3(&L61Right_p3, zpow[j+2], proof.V[j]);
}
rct::key temp = multiexp(multiexp_data, false);
addKeys_acc_p3(&L61Right_p3, x, proof.T1);
rct::key xsq;
sc_mul(xsq.bytes, x.bytes, x.bytes);
addKeys_acc_p3(&L61Right_p3, xsq, proof.T2);
ge_p3_tobytes(L61Right.bytes, &L61Right_p3);
PERF_TIMER_STOP(VERIFY_line_61rl_old);
}
if (!(L61Right == L61Left))
{
MERROR("Verification failure at step 1");
return false;
}
rct::addKeys(Y2, Y2, rct::scalarmultKey(temp, weight));
sc_mul(tmp.bytes, x.bytes, weight.bytes);
rct::addKeys(Y3, Y3, rct::scalarmultKey(proof.T1, tmp));
rct::key xsq;
sc_mul(xsq.bytes, x.bytes, x.bytes);
sc_mul(tmp.bytes, xsq.bytes, weight.bytes);
rct::addKeys(Y4, Y4, rct::scalarmultKey(proof.T2, tmp));
PERF_TIMER_STOP(VERIFY_line_61rl_new);
PERF_TIMER_START_BP(VERIFY_line_62);
// PAPER LINE 62
@ -1206,7 +1169,7 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
// PAPER LINE 26
PERF_TIMER_START_BP(VERIFY_line_26_new);
std::vector<MultiexpData> multiexp_data;
multiexp_data.clear();
multiexp_data.reserve(2*rounds);
sc_muladd(z1.bytes, proof.mu.bytes, weight.bytes, z1.bytes);
@ -1227,11 +1190,23 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
// now check all proofs at once
PERF_TIMER_START_BP(VERIFY_step2_check);
rct::key Y = Z0;
rct::key check1 = rct::identity();
rct::addKeys(check1, check1, rct::scalarmultBase(y0));
rct::addKeys(check1, check1, rct::scalarmultH(y1));
rct::subKeys(check1, check1, Y2);
rct::subKeys(check1, check1, Y3);
rct::subKeys(check1, check1, Y4);
if (!(check1 == rct::identity()))
{
MERROR("Verification failure at step 1");
return false;
}
rct::key check2 = rct::identity();
rct::addKeys(check2, check2, Z0);
sc_sub(tmp.bytes, rct::zero().bytes, z1.bytes);
rct::addKeys(Y, Y, rct::scalarmultBase(tmp));
rct::addKeys(Y, Y, Z2);
rct::addKeys(Y, Y, rct::scalarmultH(z3));
rct::addKeys(check2, check2, rct::scalarmultBase(tmp));
rct::addKeys(check2, check2, Z2);
rct::addKeys(check2, check2, rct::scalarmultH(z3));
std::vector<MultiexpData> multiexp_data;
multiexp_data.reserve(2 * maxMN);
@ -1242,10 +1217,10 @@ bool bulletproof_VERIFY(const std::vector<const Bulletproof*> &proofs)
sc_sub(tmp.bytes, rct::zero().bytes, z5[i].bytes);
multiexp_data.emplace_back(tmp, Hi_p3[i]);
}
rct::addKeys(Y, Y, multiexp(multiexp_data, true));
rct::addKeys(check2, check2, multiexp(multiexp_data, true));
PERF_TIMER_STOP(VERIFY_step2_check);
if (!(Y == rct::identity()))
if (!(check2 == rct::identity()))
{
MERROR("Verification failure at step 2");
return false;