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Abstract out verify logic for fe_mul_int

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Pieter Wuille
2022-01-28 18:33:45 -05:00
parent 65d82a3445
commit 7e7ad7ff57
4 changed files with 21 additions and 14 deletions
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10
src/field.h
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@@ -88,6 +88,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_set_b32 secp256k1_fe_impl_set_b32
# define secp256k1_fe_get_b32 secp256k1_fe_impl_get_b32
# define secp256k1_fe_negate secp256k1_fe_impl_negate
# define secp256k1_fe_mul_int secp256k1_fe_impl_mul_int
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@@ -205,8 +206,13 @@ static void secp256k1_fe_negate(secp256k1_fe *r, const secp256k1_fe *a, int m);
/** Adds a small integer (up to 0x7FFF) to r. The resulting magnitude increases by one. */
static void secp256k1_fe_add_int(secp256k1_fe *r, int a);
/** Multiplies the passed field element with a small integer constant. Multiplies the magnitude by that
* small integer. */
/** Multiply a field element with a small integer.
*
* On input, r must be a valid field element. a must be an integer in [0,32].
* The magnitude of r times a must not exceed 32.
* Performs {r *= a}.
* On output, r's magnitude is multiplied by a, and r will not be normalized.
*/
static void secp256k1_fe_mul_int(secp256k1_fe *r, int a);
/** Adds a field element to another. The result has the sum of the inputs' magnitudes as magnitude. */