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store outPk/8 in the tx for speed

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It avoids dividing by 8 when deserializing a tx, which is a slow
operation, and multiplies by 8 when verifying and extracing the
amount, which is much faster as well as less frequent
This commit is contained in:
moneromooo-monero 2021-02-14 17:45:04 +00:00
parent a345060ace
commit 4c94cfecfc
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GPG key ID: 686F07454D6CEFC3
5 changed files with 31 additions and 7 deletions
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4
src/wallet/wallet2.cpp
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@ -11290,7 +11290,9 @@ void wallet2::check_tx_key_helper(const cryptonote::transaction &tx, const crypt
crypto::derivation_to_scalar(found_derivation, n, scalar1);
rct::ecdhTuple ecdh_info = tx.rct_signatures.ecdhInfo[n];
rct::ecdhDecode(ecdh_info, rct::sk2rct(scalar1), tx.rct_signatures.type == rct::RCTTypeBulletproof2 || tx.rct_signatures.type == rct::RCTTypeCLSAG || tx.rct_signatures.type == rct::RCTTypeBulletproofPlus);
const rct::key C = tx.rct_signatures.outPk[n].mask;
rct::key C = tx.rct_signatures.outPk[n].mask;
if (rct::is_rct_bulletproof_plus(tx.rct_signatures.type))
C = rct::scalarmult8(C);
rct::key Ctmp;
THROW_WALLET_EXCEPTION_IF(sc_check(ecdh_info.mask.bytes) != 0, error::wallet_internal_error, "Bad ECDH input mask");
THROW_WALLET_EXCEPTION_IF(sc_check(ecdh_info.amount.bytes) != 0, error::wallet_internal_error, "Bad ECDH input amount");