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Abstract out verify logic for fe_set_b32

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Pieter Wuille
2022-01-28 18:19:00 -05:00
parent ce4d2093e8
commit f7a7666aeb
4 changed files with 23 additions and 21 deletions
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13
src/field.h
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@@ -85,6 +85,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_is_zero secp256k1_fe_impl_is_zero
# define secp256k1_fe_is_odd secp256k1_fe_impl_is_odd
# define secp256k1_fe_cmp_var secp256k1_fe_impl_cmp_var
# define secp256k1_fe_set_b32 secp256k1_fe_impl_set_b32
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -173,9 +174,15 @@ static int secp256k1_fe_equal_var(const secp256k1_fe *a, const secp256k1_fe *b);
*/
static int secp256k1_fe_cmp_var(const secp256k1_fe *a, const secp256k1_fe *b);
/** Set a field element equal to 32-byte big endian value.
* Returns 1 if no overflow occurred, and then the output is normalized.
* Returns 0 if overflow occurred, and then the output is only weakly normalized. */
/** Set a field element equal to a provided 32-byte big endian value.
*
* On input, r does not need to be initalized. a must be a pointer to an initialized 32-byte array.
* On output, r = a (mod p). It will have magnitude 1, and if (a < p), it will be normalized.
* If not, it will only be weakly normalized. Returns whether (a < p).
*
* Note that this function is unusual in that the normalization of the output depends on the
* run-time value of a.
*/
static int secp256k1_fe_set_b32(secp256k1_fe *r, const unsigned char *a);
/** Convert a field element to a 32-byte big endian value. Requires the input to be normalized */