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comparison libtommath/bn_mp_mul_2.c @ 1436:60fc6476e044

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Update to libtommath v1.0
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 22:37:14 +0800
parents 5ff8218bcee9
children 8bba51a55704
comparison
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1435:f849a5ca2efc 1436:60fc6476e044
1 #include <tommath.h> 1 #include <tommath_private.h>
2 #ifdef BN_MP_MUL_2_C 2 #ifdef BN_MP_MUL_2_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 * 4 *
5 * LibTomMath is a library that provides multiple-precision 5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality. 6 * integer arithmetic as well as number theoretic functionality.
10 * additional optimizations in place. 10 * additional optimizations in place.
11 * 11 *
12 * The library is free for all purposes without any express 12 * The library is free for all purposes without any express
13 * guarantee it works. 13 * guarantee it works.
14 * 14 *
15 * Tom St Denis, [email protected], http://math.libtomcrypt.com 15 * Tom St Denis, [email protected], http://libtom.org
16 */ 16 */
17 17
18 /* b = a*2 */ 18 /* b = a*2 */
19 int mp_mul_2(mp_int * a, mp_int * b) 19 int mp_mul_2(mp_int * a, mp_int * b)
20 { 20 {
21 int x, res, oldused; 21 int x, res, oldused;
22 22
23 /* grow to accomodate result */ 23 /* grow to accomodate result */
24 if (b->alloc < a->used + 1) { 24 if (b->alloc < (a->used + 1)) {
25 if ((res = mp_grow (b, a->used + 1)) != MP_OKAY) { 25 if ((res = mp_grow (b, a->used + 1)) != MP_OKAY) {
26 return res; 26 return res;
27 } 27 }
28 } 28 }
29 29
30 oldused = b->used; 30 oldused = b->used;
31 b->used = a->used; 31 b->used = a->used;
32 32
33 { 33 {
34 register mp_digit r, rr, *tmpa, *tmpb; 34 mp_digit r, rr, *tmpa, *tmpb;
35 35
36 /* alias for source */ 36 /* alias for source */
37 tmpa = a->dp; 37 tmpa = a->dp;
38 38
39 /* alias for dest */ 39 /* alias for dest */
75 b->sign = a->sign; 75 b->sign = a->sign;
76 return MP_OKAY; 76 return MP_OKAY;
77 } 77 }
78 #endif 78 #endif
79 79
80 /* $Source: /cvs/libtom/libtommath/bn_mp_mul_2.c,v $ */ 80 /* $Source$ */
81 /* $Revision: 1.3 $ */ 81 /* $Revision$ */
82 /* $Date: 2006/03/31 14:18:44 $ */ 82 /* $Date$ */