frost/secp256k1-zkp
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Simpler and faster ecdh skew fixup

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Peter Dettman committed 2021-12-26 14:56:51 +07:00
1 parent 39a36db94a
commit 1515099433
3 files changed
+23 -27
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src/group_impl.h
+8
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@@ -642,6 +642,14 @@ static void secp256k1_ge_from_storage(secp256k1_ge *r, const secp256k1_ge_storag
r->infinity = 0;
}
static SECP256K1_INLINE void secp256k1_gej_cmov(secp256k1_gej *r, const secp256k1_gej *a, int flag) {
secp256k1_fe_cmov(&r->x, &a->x, flag);
secp256k1_fe_cmov(&r->y, &a->y, flag);
secp256k1_fe_cmov(&r->z, &a->z, flag);
r->infinity ^= (r->infinity ^ a->infinity) & flag;
}
static SECP256K1_INLINE void secp256k1_ge_storage_cmov(secp256k1_ge_storage *r, const secp256k1_ge_storage *a, int flag) {
secp256k1_fe_storage_cmov(&r->x, &a->x, flag);
secp256k1_fe_storage_cmov(&r->y, &a->y, flag);