Mercurial > dropbear
comparison libtommath/bn_mp_rand.c @ 1436:60fc6476e044
Update to libtommath v1.0
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 24 Jun 2017 22:37:14 +0800 |
parents | 5ff8218bcee9 |
children | 8bba51a55704 |
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1435:f849a5ca2efc | 1436:60fc6476e044 |
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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 /* $Date$ */ |