diff options
Diffstat (limited to 'libtommath/bn_s_mp_add.c')
| -rw-r--r-- | libtommath/bn_s_mp_add.c | 34 |
1 files changed, 10 insertions, 24 deletions
diff --git a/libtommath/bn_s_mp_add.c b/libtommath/bn_s_mp_add.c index 8bcd977..c946aa8 100644 --- a/libtommath/bn_s_mp_add.c +++ b/libtommath/bn_s_mp_add.c @@ -1,22 +1,14 @@ #include "tommath_private.h" #ifdef BN_S_MP_ADD_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 */ /* low level addition, based on HAC pp.594, Algorithm 14.7 */ -int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) +mp_err s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) { const mp_int *x; - int olduse, res, min, max; + mp_err err; + int olduse, min, max; /* find sizes, we let |a| <= |b| which means we have to sort * them. "x" will point to the input with the most digits @@ -33,8 +25,8 @@ int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) /* init result */ if (c->alloc < (max + 1)) { - if ((res = mp_grow(c, max + 1)) != MP_OKAY) { - return res; + if ((err = mp_grow(c, max + 1)) != MP_OKAY) { + return err; } } @@ -64,7 +56,7 @@ int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) *tmpc = *tmpa++ + *tmpb++ + u; /* U = carry bit of T[i] */ - u = *tmpc >> (mp_digit)DIGIT_BIT; + u = *tmpc >> (mp_digit)MP_DIGIT_BIT; /* take away carry bit from T[i] */ *tmpc++ &= MP_MASK; @@ -79,7 +71,7 @@ int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) *tmpc = x->dp[i] + u; /* U = carry bit of T[i] */ - u = *tmpc >> (mp_digit)DIGIT_BIT; + u = *tmpc >> (mp_digit)MP_DIGIT_BIT; /* take away carry bit from T[i] */ *tmpc++ &= MP_MASK; @@ -90,16 +82,10 @@ int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) *tmpc++ = u; /* clear digits above oldused */ - for (i = c->used; i < olduse; i++) { - *tmpc++ = 0; - } + MP_ZERO_DIGITS(tmpc, olduse - c->used); } mp_clamp(c); return MP_OKAY; } #endif - -/* ref: HEAD -> master, tag: v1.1.0 */ -/* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ -/* commit time: 2019-01-28 20:32:32 +0100 */ |