Mercurial > dropbear

comparison libtommath/bn_mp_rand.c @ 1436:60fc6476e044

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
equal deleted inserted replaced
1435:f849a5ca2efc 1436:60fc6476e044
1 #include <tommath.h> 1 #include <tommath_private.h>
2 #ifdef BN_MP_RAND_C 2 #ifdef BN_MP_RAND_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 /* makes a pseudo-random int of a given size */ 18 /* makes a pseudo-random int of a given size */
19 int 19 int
20 mp_rand (mp_int * a, int digits) 20 mp_rand (mp_int * a, int digits)
27 return MP_OKAY; 27 return MP_OKAY;
28 } 28 }
29 29
30 /* first place a random non-zero digit */ 30 /* first place a random non-zero digit */
31 do { 31 do {
32 d = ((mp_digit) abs (rand ())) & MP_MASK; 32 d = ((mp_digit) abs (MP_GEN_RANDOM())) & MP_MASK;
33 } while (d == 0); 33 } while (d == 0);
34 34
35 if ((res = mp_add_d (a, d, a)) != MP_OKAY) { 35 if ((res = mp_add_d (a, d, a)) != MP_OKAY) {
36 return res; 36 return res;
37 } 37 }
39 while (--digits > 0) { 39 while (--digits > 0) {
40 if ((res = mp_lshd (a, 1)) != MP_OKAY) { 40 if ((res = mp_lshd (a, 1)) != MP_OKAY) {
41 return res; 41 return res;
42 } 42 }
43 43
44 if ((res = mp_add_d (a, ((mp_digit) abs (rand ())), a)) != MP_OKAY) { 44 if ((res = mp_add_d (a, ((mp_digit) abs (MP_GEN_RANDOM())), a)) != MP_OKAY) {
45 return res; 45 return res;
46 } 46 }
47 } 47 }
48 48
49 return MP_OKAY; 49 return MP_OKAY;
50 } 50 }
51 #endif 51 #endif
52 52
53 /* $Source: /cvs/libtom/libtommath/bn_mp_rand.c,v $ */ 53 /* $Source$ */
54 /* $Revision: 1.3 $ */ 54 /* $Revision$ */
55 /* $Date: 2006/03/31 14:18:44 $ */ 55 /* $Date$ */