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Abstract out verify logic for fe_inv{,_var}

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This commit is contained in:
Pieter Wuille
2022-01-28 19:20:51 -05:00
parent 3167646072
commit d5aa2f0358
4 changed files with 43 additions and 51 deletions
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22
src/field_impl.h
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@@ -351,6 +351,28 @@ SECP256K1_INLINE static void secp256k1_fe_from_storage(secp256k1_fe *r, const se
r->normalized = 1;
secp256k1_fe_verify(r);
}
static void secp256k1_fe_impl_inv(secp256k1_fe *r, const secp256k1_fe *x);
SECP256K1_INLINE static void secp256k1_fe_inv(secp256k1_fe *r, const secp256k1_fe *x) {
int input_is_zero = secp256k1_fe_normalizes_to_zero(x);
secp256k1_fe_verify(x);
secp256k1_fe_impl_inv(r, x);
r->magnitude = x->magnitude > 0;
r->normalized = 1;
VERIFY_CHECK(secp256k1_fe_normalizes_to_zero(r) == input_is_zero);
secp256k1_fe_verify(r);
}
static void secp256k1_fe_impl_inv_var(secp256k1_fe *r, const secp256k1_fe *x);
SECP256K1_INLINE static void secp256k1_fe_inv_var(secp256k1_fe *r, const secp256k1_fe *x) {
int input_is_zero = secp256k1_fe_normalizes_to_zero(x);
secp256k1_fe_verify(x);
secp256k1_fe_impl_inv_var(r, x);
r->magnitude = x->magnitude > 0;
r->normalized = 1;
VERIFY_CHECK(secp256k1_fe_normalizes_to_zero(r) == input_is_zero);
secp256k1_fe_verify(r);
}
#endif /* defined(VERIFY) */
#endif /* SECP256K1_FIELD_IMPL_H */