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secp256k1
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Use variable-time fe_inv in group

This commit is contained in:
Pieter Wuille 2013-03-31 04:17:44 +02:00
parent fba1d58d57
commit 59e038dc11
2 changed files with 4 additions and 4 deletions
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2
Makefile
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@ -1,5 +1,5 @@
FLAGS_COMMON:=-Wall FLAGS_COMMON:=-Wall
FLAGS_PROD:=-DNDEBUG -O3 -march=native FLAGS_PROD:=-DNDEBUG -O2 -march=native
FLAGS_DEBUG:=-DVERIFY -ggdb3 -O1 FLAGS_DEBUG:=-DVERIFY -ggdb3 -O1
FLAGS_TEST:=-DVERIFY -ggdb3 -O2 -march=native FLAGS_TEST:=-DVERIFY -ggdb3 -O2 -march=native

6
group.cpp
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@ -87,7 +87,7 @@ bool GroupElemJac::IsValid() const {
} }
void GroupElemJac::GetAffine(GroupElem &aff) { void GroupElemJac::GetAffine(GroupElem &aff) {
secp256k1_fe_inv(&z, &z); secp256k1_fe_inv_var(&z, &z);
secp256k1_fe_t z2; secp256k1_fe_sqr(&z2, &z); secp256k1_fe_t z2; secp256k1_fe_sqr(&z2, &z);
secp256k1_fe_t z3; secp256k1_fe_mul(&z3, &z, &z2); secp256k1_fe_t z3; secp256k1_fe_mul(&z3, &z, &z2);
secp256k1_fe_mul(&x, &x, &z2); secp256k1_fe_mul(&x, &x, &z2);
@ -99,12 +99,12 @@ void GroupElemJac::GetAffine(GroupElem &aff) {
} }
void GroupElemJac::GetX(secp256k1_fe_t &xout) { void GroupElemJac::GetX(secp256k1_fe_t &xout) {
secp256k1_fe_t zi2; secp256k1_fe_inv(&zi2, &z); secp256k1_fe_sqr(&zi2, &zi2); secp256k1_fe_t zi2; secp256k1_fe_inv_var(&zi2, &z); secp256k1_fe_sqr(&zi2, &zi2);
secp256k1_fe_mul(&xout, &x, &zi2); secp256k1_fe_mul(&xout, &x, &zi2);
} }
void GroupElemJac::GetY(secp256k1_fe_t &yout) { void GroupElemJac::GetY(secp256k1_fe_t &yout) {
secp256k1_fe_t zi; secp256k1_fe_inv(&zi, &z); secp256k1_fe_t zi; secp256k1_fe_inv_var(&zi, &z);
secp256k1_fe_t zi3; secp256k1_fe_sqr(&zi3, &zi); secp256k1_fe_mul(&zi3, &zi, &zi3); secp256k1_fe_t zi3; secp256k1_fe_sqr(&zi3, &zi); secp256k1_fe_mul(&zi3, &zi, &zi3);
secp256k1_fe_mul(&yout, &y, &zi3); secp256k1_fe_mul(&yout, &y, &zi3);
} }