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Abstract out verify logic for fe_get_bounds

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This commit is contained in:
Pieter Wuille
2022-06-08 15:04:49 -04:00
parent d5aa2f0358
commit 283cd80ab4
4 changed files with 17 additions and 18 deletions
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6
src/field.h
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@@ -97,6 +97,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_from_storage secp256k1_fe_impl_from_storage
# 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
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -306,8 +307,9 @@ static void secp256k1_fe_cmov(secp256k1_fe *r, const secp256k1_fe *a, int flag);
* The output is not guaranteed to be normalized, regardless of the input. */
static void secp256k1_fe_half(secp256k1_fe *r);
/** Sets each limb of 'r' to its upper bound at magnitude 'm'. The output will also have its
* magnitude set to 'm' and is normalized if (and only if) 'm' is zero. */
/** Sets r to a field element with magnitude m, normalized if (and only if) m==0.
* The value is chosen so that it is likely to trigger edge cases related to
* internal overflows. */
static void secp256k1_fe_get_bounds(secp256k1_fe *r, int m);
/** Determine whether a is a square (modulo p). */