diff options
Diffstat (limited to 'src/num_gmp_impl.h')
-rw-r--r-- | src/num_gmp_impl.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/num_gmp_impl.h b/src/num_gmp_impl.h index 7b6a89719a..3a46495eea 100644 --- a/src/num_gmp_impl.h +++ b/src/num_gmp_impl.h @@ -144,6 +144,32 @@ static void secp256k1_num_mod_inverse(secp256k1_num *r, const secp256k1_num *a, memset(v, 0, sizeof(v)); } +static int secp256k1_num_jacobi(const secp256k1_num *a, const secp256k1_num *b) { + int ret; + mpz_t ga, gb; + secp256k1_num_sanity(a); + secp256k1_num_sanity(b); + VERIFY_CHECK(!b->neg && (b->limbs > 0) && (b->data[0] & 1)); + + mpz_inits(ga, gb, NULL); + + mpz_import(gb, b->limbs, -1, sizeof(mp_limb_t), 0, 0, b->data); + mpz_import(ga, a->limbs, -1, sizeof(mp_limb_t), 0, 0, a->data); + if (a->neg) { + mpz_neg(ga, ga); + } + + ret = mpz_jacobi(ga, gb); + + mpz_clears(ga, gb, NULL); + + return ret; +} + +static int secp256k1_num_is_one(const secp256k1_num *a) { + return (a->limbs == 1 && a->data[0] == 1); +} + static int secp256k1_num_is_zero(const secp256k1_num *a) { return (a->limbs == 1 && a->data[0] == 0); } |