diff options
| -rw-r--r-- | networking/tls_sp_c32.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/networking/tls_sp_c32.c b/networking/tls_sp_c32.c index baed62f..b3f7888 100644 --- a/networking/tls_sp_c32.c +++ b/networking/tls_sp_c32.c @@ -636,12 +636,14 @@ static void sp_256_rshift1_8(sp_digit* r, sp_digit carry) } #endif -/* Divide the number by 2 mod the modulus (prime). (r = a / 2 % m) */ -static void sp_256_div2_8(sp_digit* r, const sp_digit* a, const sp_digit* m) +/* Divide the number by 2 mod the modulus (prime). (r = (r / 2) % m) */ +static void sp_256_div2_8(sp_digit* r /*, const sp_digit* m*/) { + const sp_digit* m = p256_mod; + int carry = 0; - if (a[0] & 1) - carry = sp_256_add_8(r, a, m); + if (r[0] & 1) + carry = sp_256_add_8(r, r, m); sp_256_norm_8(r); sp_256_rshift1_8(r, carry); } @@ -1125,7 +1127,7 @@ static void sp_256_proj_point_dbl_8(sp_point* r, sp_point* p) /* T2 = Y * Y */ sp_256to512z_mont_sqr_8(t2, r->y /*, p256_mod, p256_mp_mod*/); /* T2 = T2/2 */ - sp_256_div2_8(t2, t2, p256_mod); + sp_256_div2_8(t2 /*, p256_mod*/); /* Y = Y * X */ sp_256to512z_mont_mul_8(r->y, r->y, r->x /*, p256_mod, p256_mp_mod*/); /* X = T1 * T1 */ |