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Abstract out verify logic for fe_is_zero

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This commit is contained in:
Pieter Wuille
2022-01-28 18:07:55 -05:00
parent c701d9a471
commit d3f3fe8616
4 changed files with 18 additions and 11 deletions
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10
src/field.h
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@@ -82,6 +82,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_normalizes_to_zero_var secp256k1_fe_impl_normalizes_to_zero_var
# 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
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -131,7 +132,14 @@ static void secp256k1_fe_set_int(secp256k1_fe *r, int a);
*/
static void secp256k1_fe_clear(secp256k1_fe *a);
/** Verify whether a field element is zero. Requires the input to be normalized. */
/** Determine whether a represents field element 0.
*
* On input, a must be a valid normalized field element.
* Returns whether a = 0 (mod p).
*
* This behaves identical to secp256k1_normalizes_to_zero{,_var}, but requires
* normalized input (and is much faster).
*/
static int secp256k1_fe_is_zero(const secp256k1_fe *a);
/** Check the "oddness" of a field element. Requires the input to be normalized. */