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Abstract out verify logic for fe_half

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Pieter Wuille
2022-11-17 11:28:49 -05:00
parent 283cd80ab4
commit 89e324c6b9
4 changed files with 23 additions and 31 deletions
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10
src/field.h
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@@ -98,6 +98,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_inv secp256k1_fe_impl_inv
# define secp256k1_fe_inv_var secp256k1_fe_impl_inv_var
# define secp256k1_fe_get_bounds secp256k1_fe_impl_get_bounds
# define secp256k1_fe_half secp256k1_fe_impl_half
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -302,9 +303,12 @@ static void secp256k1_fe_storage_cmov(secp256k1_fe_storage *r, const secp256k1_f
*/
static void secp256k1_fe_cmov(secp256k1_fe *r, const secp256k1_fe *a, int flag);
/** Halves the value of a field element modulo the field prime. Constant-time.
* For an input magnitude 'm', the output magnitude is set to 'floor(m/2) + 1'.
* The output is not guaranteed to be normalized, regardless of the input. */
/** Halve the value of a field element modulo the field prime in constant-time.
*
* On input, r must be a valid field element.
* On output, r will be normalized and have magnitude floor(m/2) + 1 where m is
* the magnitude of r on input.
*/
static void secp256k1_fe_half(secp256k1_fe *r);
/** Sets r to a field element with magnitude m, normalized if (and only if) m==0.