diff options
Diffstat (limited to 'libtommath/bn_mp_mod.c')
| -rw-r--r-- | libtommath/bn_mp_mod.c | 47 |
1 files changed, 25 insertions, 22 deletions
diff --git a/libtommath/bn_mp_mod.c b/libtommath/bn_mp_mod.c index 98e155e..64e73ea 100644 --- a/libtommath/bn_mp_mod.c +++ b/libtommath/bn_mp_mod.c @@ -1,4 +1,4 @@ -#include <tommath.h> +#include <tommath_private.h> #ifdef BN_MP_MOD_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * @@ -12,33 +12,36 @@ * The library is free for all purposes without any express * guarantee it works. * - * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com + * Tom St Denis, tstdenis82@gmail.com, http://libtom.org */ -/* c = a mod b, 0 <= c < b */ -int -mp_mod (mp_int * a, mp_int * b, mp_int * c) +/* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */ +int mp_mod(const mp_int *a, const mp_int *b, mp_int *c) { - mp_int t; - int res; + mp_int t; + int res; - if ((res = mp_init (&t)) != MP_OKAY) { - return res; - } + if ((res = mp_init_size(&t, b->used)) != MP_OKAY) { + return res; + } - if ((res = mp_div (a, b, NULL, &t)) != MP_OKAY) { - mp_clear (&t); - return res; - } + if ((res = mp_div(a, b, NULL, &t)) != MP_OKAY) { + mp_clear(&t); + return res; + } - if (t.sign != b->sign) { - res = mp_add (b, &t, c); - } else { - res = MP_OKAY; - mp_exch (&t, c); - } + if ((mp_iszero(&t) != MP_NO) || (t.sign == b->sign)) { + res = MP_OKAY; + mp_exch(&t, c); + } else { + res = mp_add(b, &t, c); + } - mp_clear (&t); - return res; + mp_clear(&t); + return res; } #endif + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ |