store outPk/8 in the tx for speed
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
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@ -241,8 +241,15 @@ void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const std::pair
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}
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else
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{
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rct::key commitment;
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if (tx.version > 1)
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{
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commitment = tx.rct_signatures.outPk[i].mask;
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if (rct::is_rct_bulletproof_plus(tx.rct_signatures.type))
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commitment = rct::scalarmult8(commitment);
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}
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amount_output_indices[i] = add_output(tx_hash, tx.vout[i], i, tx.unlock_time,
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tx.version > 1 ? &tx.rct_signatures.outPk[i].mask : NULL);
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tx.version > 1 ? &commitment : NULL);
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}
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}
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add_tx_amount_output_indices(tx_id, amount_output_indices);
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@ -189,7 +189,7 @@ namespace cryptonote
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CHECK_AND_ASSERT_MES(n_amounts == rv.outPk.size(), false, "Internal error filling out V");
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rv.p.bulletproofs_plus[0].V.resize(n_amounts);
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for (size_t i = 0; i < n_amounts; ++i)
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rv.p.bulletproofs_plus[0].V[i] = rct::scalarmultKey(rv.outPk[i].mask, rct::INV_EIGHT);
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rv.p.bulletproofs_plus[0].V[i] = rv.outPk[i].mask;
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}
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else if (bulletproof)
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{
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@ -1205,7 +1205,7 @@ namespace rct {
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rv.p.bulletproofs_plus.clear();
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if (bulletproof_or_plus)
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{
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const bool plus = rv.type == RCTTypeBulletproofPlus;
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const bool plus = is_rct_bulletproof_plus(rv.type);
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size_t n_amounts = outamounts.size();
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size_t amounts_proved = 0;
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if (rct_config.range_proof_type == RangeProofPaddedBulletproof)
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@ -1235,7 +1235,10 @@ namespace rct {
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}
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for (i = 0; i < outamounts.size(); ++i)
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{
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rv.outPk[i].mask = rct::scalarmult8(C[i]);
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if (plus)
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rv.outPk[i].mask = C[i];
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else
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rv.outPk[i].mask = rct::scalarmult8(C[i]);
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outSk[i].mask = masks[i];
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}
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}
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@ -1273,7 +1276,10 @@ namespace rct {
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}
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for (i = 0; i < batch_size; ++i)
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{
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rv.outPk[i + amounts_proved].mask = rct::scalarmult8(C[i]);
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if (plus)
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rv.outPk[i + amounts_proved].mask = C[i];
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else
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rv.outPk[i + amounts_proved].mask = rct::scalarmult8(C[i]);
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outSk[i + amounts_proved].mask = masks[i];
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}
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amounts_proved += batch_size;
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@ -1480,7 +1486,10 @@ namespace rct {
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rct::keyV masks(rv.outPk.size());
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for (size_t i = 0; i < rv.outPk.size(); i++) {
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masks[i] = rv.outPk[i].mask;
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if (bulletproof_plus)
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masks[i] = rct::scalarmult8(rv.outPk[i].mask);
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else
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masks[i] = rv.outPk[i].mask;
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}
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key sumOutpks = addKeys(masks);
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DP(sumOutpks);
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@ -1640,6 +1649,8 @@ namespace rct {
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mask = ecdh_info.mask;
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key amount = ecdh_info.amount;
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key C = rv.outPk[i].mask;
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if (is_rct_bulletproof_plus(rv.type))
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C = scalarmult8(C);
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DP("C");
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DP(C);
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key Ctmp;
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@ -1671,6 +1682,8 @@ namespace rct {
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mask = ecdh_info.mask;
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key amount = ecdh_info.amount;
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key C = rv.outPk[i].mask;
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if (is_rct_bulletproof_plus(rv.type))
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C = scalarmult8(C);
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DP("C");
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DP(C);
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key Ctmp;
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@ -11290,7 +11290,9 @@ void wallet2::check_tx_key_helper(const cryptonote::transaction &tx, const crypt
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crypto::derivation_to_scalar(found_derivation, n, scalar1);
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rct::ecdhTuple ecdh_info = tx.rct_signatures.ecdhInfo[n];
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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);
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const rct::key C = tx.rct_signatures.outPk[n].mask;
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rct::key C = tx.rct_signatures.outPk[n].mask;
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if (rct::is_rct_bulletproof_plus(tx.rct_signatures.type))
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C = rct::scalarmult8(C);
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rct::key Ctmp;
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THROW_WALLET_EXCEPTION_IF(sc_check(ecdh_info.mask.bytes) != 0, error::wallet_internal_error, "Bad ECDH input mask");
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THROW_WALLET_EXCEPTION_IF(sc_check(ecdh_info.amount.bytes) != 0, error::wallet_internal_error, "Bad ECDH input amount");
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@ -450,6 +450,8 @@ bool gen_multisig_tx_validation_base::generate_with(std::vector<test_event_entry
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rct::ecdhTuple ecdh_info = tx.rct_signatures.ecdhInfo[n];
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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);
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rct::key C = tx.rct_signatures.outPk[n].mask;
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if (rct::is_rct_bulletproof_plus(tx.rct_signatures.type))
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C = rct::scalarmult8(C);
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rct::addKeys2(Ctmp, ecdh_info.mask, ecdh_info.amount, rct::H);
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CHECK_AND_ASSERT_MES(rct::equalKeys(C, Ctmp), false, "Failed to decode amount");
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amount += rct::h2d(ecdh_info.amount);
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