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ringct: the commitment mask is now deterministic

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saves space in the tx and is safe

Found by knaccc
This commit is contained in:
moneromooo-monero
2019-01-08 16:05:18 +00:00
parent 99d946e619
commit 7d37598158
7 changed files with 55 additions and 63 deletions
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13
src/ringct/rctSigs.cpp
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@@ -79,9 +79,12 @@ namespace
}
namespace rct {
Bulletproof proveRangeBulletproof(keyV &C, keyV &masks, const std::vector<uint64_t> &amounts)
Bulletproof proveRangeBulletproof(keyV &C, keyV &masks, const std::vector<uint64_t> &amounts, epee::span<const key> sk)
{
masks = rct::skvGen(amounts.size());
CHECK_AND_ASSERT_THROW_MES(amounts.size() == sk.size(), "Invalid amounts/sk sizes");
masks.resize(amounts.size());
for (size_t i = 0; i < masks.size(); ++i)
masks[i] = genCommitmentMask(sk[i]);
Bulletproof proof = bulletproof_PROVE(amounts, masks);
CHECK_AND_ASSERT_THROW_MES(proof.V.size() == amounts.size(), "V does not have the expected size");
C = proof.V;
@@ -803,7 +806,8 @@ namespace rct {
}
else
{
rv.p.bulletproofs.push_back(proveRangeBulletproof(C, masks, outamounts));
const epee::span<const key> keys{&amount_keys[0], amount_keys.size()};
rv.p.bulletproofs.push_back(proveRangeBulletproof(C, masks, outamounts, keys));
#ifdef DBG
CHECK_AND_ASSERT_THROW_MES(verBulletproof(rv.p.bulletproofs.back()), "verBulletproof failed on newly created proof");
#endif
@@ -831,7 +835,8 @@ namespace rct {
}
else
{
rv.p.bulletproofs.push_back(proveRangeBulletproof(C, masks, batch_amounts));
const epee::span<const key> keys{&amount_keys[amounts_proved], batch_size};
rv.p.bulletproofs.push_back(proveRangeBulletproof(C, masks, batch_amounts, keys));
#ifdef DBG
CHECK_AND_ASSERT_THROW_MES(verBulletproof(rv.p.bulletproofs.back()), "verBulletproof failed on newly created proof");
#endif