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rct: avoid repeated unnecessary conversions when accummulating

This commit is contained in:
moneromooo-monero 2018-06-24 21:59:49 +01:00
parent 11dbfbc5b3
commit 607301bf6d
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GPG Key ID: 686F07454D6CEFC3
3 changed files with 25 additions and 7 deletions
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19
src/ringct/rctOps.cpp
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@ -252,6 +252,25 @@ namespace rct {
return k;
}
rct::key addKeys(const keyV &A) {
if (A.empty())
return rct::identity();
ge_p3 p3, tmp;
CHECK_AND_ASSERT_THROW_MES_L1(ge_frombytes_vartime(&p3, A[0].bytes) == 0, "ge_frombytes_vartime failed at "+boost::lexical_cast<std::string>(__LINE__));
for (size_t i = 1; i < A.size(); ++i)
{
CHECK_AND_ASSERT_THROW_MES_L1(ge_frombytes_vartime(&tmp, A[i].bytes) == 0, "ge_frombytes_vartime failed at "+boost::lexical_cast<std::string>(__LINE__));
ge_cached p2;
ge_p3_to_cached(&p2, &tmp);
ge_p1p1 p1;
ge_add(&p1, &p3, &p2);
ge_p1p1_to_p3(&p3, &p1);
}
rct::key res;
ge_p3_tobytes(res.bytes, &p3);
return res;
}
//addKeys1
//aGB = aG + B where a is a scalar, G is the basepoint, and B is a point
void addKeys1(key &aGB, const key &a, const key & B) {

1
src/ringct/rctOps.h
View File

@ -132,6 +132,7 @@ namespace rct {
//for curve points: AB = A + B
void addKeys(key &AB, const key &A, const key &B);
rct::key addKeys(const key &A, const key &B);
rct::key addKeys(const keyV &A);
//aGB = aG + B where a is a scalar, G is the basepoint, and B is a point
void addKeys1(key &aGB, const key &a, const key & B);
//aGbB = aG + bB where a, b are scalars, G is the basepoint and B is a point

12
src/ringct/rctSigs.cpp
View File

@ -963,18 +963,16 @@ namespace rct {
const bool bulletproof = is_rct_bulletproof(rv.type);
const keyV &pseudoOuts = bulletproof ? rv.p.pseudoOuts : rv.pseudoOuts;
key sumOutpks = identity();
rct::keyV masks(rv.outPk.size());
for (size_t i = 0; i < rv.outPk.size(); i++) {
addKeys(sumOutpks, sumOutpks, rv.outPk[i].mask);
masks[i] = rv.outPk[i].mask;
}
key sumOutpks = addKeys(masks);
DP(sumOutpks);
key txnFeeKey = scalarmultH(d2h(rv.txnFee));
const key txnFeeKey = scalarmultH(d2h(rv.txnFee));
addKeys(sumOutpks, txnFeeKey, sumOutpks);
key sumPseudoOuts = identity();
for (size_t i = 0 ; i < pseudoOuts.size() ; i++) {
addKeys(sumPseudoOuts, sumPseudoOuts, pseudoOuts[i]);
}
key sumPseudoOuts = addKeys(pseudoOuts);
DP(sumPseudoOuts);
//check pseudoOuts vs Outs..