diff options
Diffstat (limited to 'libtommath/bn_s_mp_mul_high_digs.c')
| -rw-r--r-- | libtommath/bn_s_mp_mul_high_digs.c | 41 |
1 files changed, 14 insertions, 27 deletions
diff --git a/libtommath/bn_s_mp_mul_high_digs.c b/libtommath/bn_s_mp_mul_high_digs.c index 7642def..2bb2a50 100644 --- a/libtommath/bn_s_mp_mul_high_digs.c +++ b/libtommath/bn_s_mp_mul_high_digs.c @@ -1,38 +1,29 @@ #include "tommath_private.h" #ifdef BN_S_MP_MUL_HIGH_DIGS_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 */ /* multiplies |a| * |b| and does not compute the lower digs digits * [meant to get the higher part of the product] */ -int s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) +mp_err s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) { - mp_int t; - int res, pa, pb, ix, iy; + mp_int t; + int pa, pb, ix, iy; + mp_err err; mp_digit u; - mp_word r; + mp_word r; mp_digit tmpx, *tmpt, *tmpy; /* can we use the fast multiplier? */ -#ifdef BN_FAST_S_MP_MUL_HIGH_DIGS_C - if (((a->used + b->used + 1) < (int)MP_WARRAY) - && (MIN(a->used, b->used) < (int)(1u << (((size_t)CHAR_BIT * sizeof(mp_word)) - (2u * (size_t)DIGIT_BIT))))) { - return fast_s_mp_mul_high_digs(a, b, c, digs); + if (MP_HAS(S_MP_MUL_HIGH_DIGS_FAST) + && ((a->used + b->used + 1) < MP_WARRAY) + && (MP_MIN(a->used, b->used) < MP_MAXFAST)) { + return s_mp_mul_high_digs_fast(a, b, c, digs); } -#endif - if ((res = mp_init_size(&t, a->used + b->used + 1)) != MP_OKAY) { - return res; + if ((err = mp_init_size(&t, a->used + b->used + 1)) != MP_OKAY) { + return err; } t.used = a->used + b->used + 1; @@ -61,7 +52,7 @@ int s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK); /* carry the carry */ - u = (mp_digit)(r >> (mp_word)DIGIT_BIT); + u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT); } *tmpt = u; } @@ -71,7 +62,3 @@ int s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) return MP_OKAY; } #endif - -/* ref: HEAD -> master, tag: v1.1.0 */ -/* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ -/* commit time: 2019-01-28 20:32:32 +0100 */ |