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Abstract out verify logic for fe_normalize_weak

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This commit is contained in:
Pieter Wuille
2022-01-28 17:54:22 -05:00
parent b6b6f9cb97
commit e28b51f522
4 changed files with 16 additions and 13 deletions
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7
src/field.h
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@@ -76,6 +76,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
* internal field implementation, to avoid the potential overhead of a
* function call (even though presumably inlinable). */
# define secp256k1_fe_normalize secp256k1_fe_impl_normalize
# define secp256k1_fe_normalize_weak secp256k1_fe_impl_normalize_weak
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -85,7 +86,11 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
*/
static void secp256k1_fe_normalize(secp256k1_fe *r);
/** Weakly normalize a field element: reduce its magnitude to 1, but don't fully normalize. */
/** Give a field element magnitude 1.
*
* On input, r must be a valid field element.
* On output, r represents the same value but has magnitude=1. Normalized is unchanged.
*/
static void secp256k1_fe_normalize_weak(secp256k1_fe *r);
/** Normalize a field element, without constant-time guarantee. */