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Improve comments for VerifyAmount()

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This commit is contained in:
Tim Ruffing 2018-05-23 15:21:16 +02:00
parent 42b62ac285
commit 05602edf6f
3 changed files with 13 additions and 6 deletions
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8
src/validation.cpp
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@ -793,6 +793,7 @@ bool VerifyAmounts(const CCoinsViewCache& cache, const CTransaction& tx, std::ve
if (!MoneyRange(val.GetAmount()))
return false;
// Fails if val.GetAmount() == 0
if (secp256k1_pedersen_commit(secp256k1_ctx_verify_amounts, &commit, explBlinds, val.GetAmount(), &gen) != 1)
return false;
} else if (val.IsCommitment()) {
@ -831,8 +832,7 @@ bool VerifyAmounts(const CCoinsViewCache& cache, const CTransaction& tx, std::ve
// Null nAmount is considered explicit 0, so just check for commitment
CalculateReissuanceToken(assetTokenID, entropy, issuance.nAmount.IsCommitment());
} else {
//Re-issuance
// Re-issuance
// hashAssetIdentifier doubles as the entropy on reissuance
CalculateAsset(assetID, issuance.assetEntropy);
CalculateReissuanceToken(assetTokenID, issuance.assetEntropy, issuance.nAmount.IsCommitment());
@ -927,6 +927,7 @@ bool VerifyAmounts(const CCoinsViewCache& cache, const CTransaction& tx, std::ve
continue;
} else {
// No spendable 0-value outputs
// Reason: A spendable output of 0 reissuance tokens would allow reissuance without reissuance tokens.
return false;
}
}
@ -977,11 +978,12 @@ bool VerifyAmounts(const CCoinsViewCache& cache, const CTransaction& tx, std::ve
}
}
// Surjection proofs
for (size_t i = 0; i < tx.vout.size(); i++)
{
const CConfidentialAsset& asset = tx.vout[i].nAsset;
const CTxOutWitness* ptxoutwit = tx.wit.vtxoutwit.size() <= i? NULL: &tx.wit.vtxoutwit[i];
//No need for surjective proof
// No need for surjection proof
if (asset.IsExplicit()) {
if (ptxoutwit && !ptxoutwit->vchSurjectionproof.empty()) {
return false;