frost/secp256k1-zkp
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Require that r and b are different for field multiplication.

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Suggested by Peter Dettman, this prepares for slightly faster muitiplication
which writes results immediately to r before finishing reading b.
This commit is contained in:
Pieter Wuille
2014-11-30 19:27:24 +01:00
parent 0af5b47133
commit be82e92fc4
9 changed files with 30 additions and 21 deletions
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src/field_5x52_impl.h
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@@ -247,12 +247,13 @@ SECP256K1_INLINE static void secp256k1_fe_add(secp256k1_fe_t *r, const secp256k1
#endif
}
static void secp256k1_fe_mul(secp256k1_fe_t *r, const secp256k1_fe_t *a, const secp256k1_fe_t *b) {
static void secp256k1_fe_mul(secp256k1_fe_t *r, const secp256k1_fe_t *a, const secp256k1_fe_t * SECP256K1_RESTRICT b) {
#ifdef VERIFY
VERIFY_CHECK(a->magnitude <= 8);
VERIFY_CHECK(b->magnitude <= 8);
secp256k1_fe_verify(a);
secp256k1_fe_verify(b);
VERIFY_CHECK(r != b);
#endif
secp256k1_fe_mul_inner(a->n, b->n, r->n);
#ifdef VERIFY