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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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21
src/ringct/rctSigs.cpp
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@ -1205,7 +1205,7 @@ namespace rct {
rv.p.bulletproofs_plus.clear();
if (bulletproof_or_plus)
{
const bool plus = rv.type == RCTTypeBulletproofPlus;
const bool plus = is_rct_bulletproof_plus(rv.type);
size_t n_amounts = outamounts.size();
size_t amounts_proved = 0;
if (rct_config.range_proof_type == RangeProofPaddedBulletproof)
@ -1235,7 +1235,10 @@ namespace rct {
}
for (i = 0; i < outamounts.size(); ++i)
{
rv.outPk[i].mask = rct::scalarmult8(C[i]);
if (plus)
rv.outPk[i].mask = C[i];
else
rv.outPk[i].mask = rct::scalarmult8(C[i]);
outSk[i].mask = masks[i];
}
}
@ -1273,7 +1276,10 @@ namespace rct {
}
for (i = 0; i < batch_size; ++i)
{
rv.outPk[i + amounts_proved].mask = rct::scalarmult8(C[i]);
if (plus)
rv.outPk[i + amounts_proved].mask = C[i];
else
rv.outPk[i + amounts_proved].mask = rct::scalarmult8(C[i]);
outSk[i + amounts_proved].mask = masks[i];
}
amounts_proved += batch_size;
@ -1480,7 +1486,10 @@ namespace rct {
rct::keyV masks(rv.outPk.size());
for (size_t i = 0; i < rv.outPk.size(); i++) {
masks[i] = rv.outPk[i].mask;
if (bulletproof_plus)
masks[i] = rct::scalarmult8(rv.outPk[i].mask);
else
masks[i] = rv.outPk[i].mask;
}
key sumOutpks = addKeys(masks);
DP(sumOutpks);
@ -1640,6 +1649,8 @@ namespace rct {
mask = ecdh_info.mask;
key amount = ecdh_info.amount;
key C = rv.outPk[i].mask;
if (is_rct_bulletproof_plus(rv.type))
C = scalarmult8(C);
DP("C");
DP(C);
key Ctmp;
@ -1671,6 +1682,8 @@ namespace rct {
mask = ecdh_info.mask;
key amount = ecdh_info.amount;
key C = rv.outPk[i].mask;
if (is_rct_bulletproof_plus(rv.type))
C = scalarmult8(C);
DP("C");
DP(C);
key Ctmp;