diff options
Diffstat (limited to 'libtommath/bn_mp_div_2.c')
| -rw-r--r-- | libtommath/bn_mp_div_2.c | 33 |
1 files changed, 9 insertions, 24 deletions
diff --git a/libtommath/bn_mp_div_2.c b/libtommath/bn_mp_div_2.c index e679d00..2561e5a 100644 --- a/libtommath/bn_mp_div_2.c +++ b/libtommath/bn_mp_div_2.c @@ -1,26 +1,18 @@ #include "tommath_private.h" #ifdef BN_MP_DIV_2_C -/* LibTomMath, multiple-precision integer library -- Tom St Denis - * - * LibTomMath is a library that provides multiple-precision - * integer arithmetic as well as number theoretic functionality. - * - * The library was designed directly after the MPI library by - * Michael Fromberger but has been written from scratch with - * additional optimizations in place. - * - * SPDX-License-Identifier: Unlicense - */ +/* LibTomMath, multiple-precision integer library -- Tom St Denis */ +/* SPDX-License-Identifier: Unlicense */ /* b = a/2 */ -int mp_div_2(const mp_int *a, mp_int *b) +mp_err mp_div_2(const mp_int *a, mp_int *b) { - int x, res, oldused; + int x, oldused; + mp_err err; /* copy */ if (b->alloc < a->used) { - if ((res = mp_grow(b, a->used)) != MP_OKAY) { - return res; + if ((err = mp_grow(b, a->used)) != MP_OKAY) { + return err; } } @@ -42,24 +34,17 @@ int mp_div_2(const mp_int *a, mp_int *b) rr = *tmpa & 1u; /* shift the current digit, add in carry and store */ - *tmpb-- = (*tmpa-- >> 1) | (r << (DIGIT_BIT - 1)); + *tmpb-- = (*tmpa-- >> 1) | (r << (MP_DIGIT_BIT - 1)); /* forward carry to next iteration */ r = rr; } /* zero excess digits */ - tmpb = b->dp + b->used; - for (x = b->used; x < oldused; x++) { - *tmpb++ = 0; - } + MP_ZERO_DIGITS(b->dp + b->used, oldused - b->used); } b->sign = a->sign; mp_clamp(b); return MP_OKAY; } #endif - -/* ref: $Format:%D$ */ -/* git commit: $Format:%H$ */ -/* commit time: $Format:%ai$ */ |