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SurjectionProof caching

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This commit is contained in:
Gregory Sanders 2016-11-29 13:59:01 -05:00
parent 13cdcfc979
commit a38c6b18b5
5 changed files with 62 additions and 7 deletions
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41
src/script/sigcache.cpp
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@ -91,6 +91,9 @@ static CSignatureCache signatureCache;
static CSignatureCache rangeProofCache;
static CSignatureCache surjectionProofCache;
}
// To be called once in AppInit2/TestingSetup to initialize the signatureCache
@ -115,6 +118,18 @@ void InitRangeproofCache()
(nElems*sizeof(uint256)) >>20, nMaxCacheSize>>20, nElems);
}
// To be called once in AppInit2/TestingSetup to initialize the surjectionrproof cache
void InitSurjectionproofCache()
{
// nMaxCacheSize is unsigned. If -maxsigcachesize is set to zero,
// setup_bytes creates the minimum possible cache (2 elements).
size_t nMaxCacheSize = std::min(std::max((int64_t)0, GetArg("-maxsigcachesize", DEFAULT_MAX_SIG_CACHE_SIZE)), MAX_MAX_SIG_CACHE_SIZE) * ((size_t) 1 << 20);
size_t nElems = surjectionProofCache.setup_bytes(nMaxCacheSize);
LogPrintf("Using %zu MiB out of %zu requested for surjectionproof cache, able to store %zu elements\n",
(nElems*sizeof(uint256)) >>20, nMaxCacheSize>>20, nElems);
}
bool CachingTransactionSignatureChecker::VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& pubkey, const uint256& sighash) const
{
uint256 entry;
@ -153,3 +168,29 @@ bool CachingRangeProofChecker::VerifyRangeProof(const std::vector<unsigned char>
return true;
}
bool CachingSurjectionProofChecker::VerifySurjectionProof(secp256k1_surjectionproof& proof, std::vector<secp256k1_generator>& vTags, secp256k1_generator& gen, const secp256k1_context* secp256k1_ctx_verify_amounts) const
{
std::vector<unsigned char> vchproof;
size_t proof_len = 0;
vchproof.resize(secp256k1_surjectionproof_serialized_size(secp256k1_ctx_verify_amounts, &proof));
secp256k1_surjectionproof_serialize(secp256k1_ctx_verify_amounts, &vchproof[0], &proof_len, &proof);
std::vector<unsigned char> vchGen;
vchGen.resize(CTxOutValue::nCommittedSize);
secp256k1_generator_serialize(secp256k1_ctx_verify_amounts, &vchGen[0], &gen);
CPubKey pubkey(vchGen);
uint256 entry;
surjectionProofCache.ComputeEntry(entry, uint256(), vchproof, pubkey);
if (surjectionProofCache.Get(entry, !store)) {
return true;
}
if (secp256k1_surjectionproof_verify(secp256k1_ctx_verify_amounts, &proof, vTags.data(), vTags.size(), &gen) != 1) {
return false;
}
return true;
}