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Abstract out verify logic for fe_is_odd

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This commit is contained in:
Pieter Wuille
2022-01-28 18:11:21 -05:00
parent d3f3fe8616
commit c5e788d672
4 changed files with 15 additions and 11 deletions
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7
src/field.h
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@@ -83,6 +83,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_set_int secp256k1_fe_impl_set_int
# define secp256k1_fe_clear secp256k1_fe_impl_clear
# define secp256k1_fe_is_zero secp256k1_fe_impl_is_zero
# define secp256k1_fe_is_odd secp256k1_fe_impl_is_odd
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -142,7 +143,11 @@ static void secp256k1_fe_clear(secp256k1_fe *a);
*/
static int secp256k1_fe_is_zero(const secp256k1_fe *a);
/** Check the "oddness" of a field element. Requires the input to be normalized. */
/** Determine whether a (mod p) is odd.
*
* On input, a must be a valid normalized field element.
* Returns (int(a) mod p) & 1.
*/
static int secp256k1_fe_is_odd(const secp256k1_fe *a);
/** Compare two field elements. Requires magnitude-1 inputs. */