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Abstract out verify logic for fe_get_b32

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This commit is contained in:
Pieter Wuille
2022-01-28 18:23:54 -05:00
parent f7a7666aeb
commit 144670893e
4 changed files with 14 additions and 11 deletions
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6
src/field.h
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@@ -86,6 +86,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# 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
# define secp256k1_fe_get_b32 secp256k1_fe_impl_get_b32
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -185,7 +186,10 @@ static int secp256k1_fe_cmp_var(const secp256k1_fe *a, const secp256k1_fe *b);
*/
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 */
/** Convert a field element to 32-byte big endian byte array.
* On input, a must be a valid normalized field element, and r a pointer to a 32-byte array.
* On output, r = a (mod p).
*/
static void secp256k1_fe_get_b32(unsigned char *r, const secp256k1_fe *a);
/** Set a field element equal to the additive inverse of another. Takes a maximum magnitude of the input