Mercurial > dropbear

comparison libtomcrypt/src/misc/mpi/rand_prime.c @ 293:9d110777f345 contrib-blacklist

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.dropbear' (head 7ad1775ed65e75dbece27fe6b65bf1a234db386a) to branch 'au.asn.ucc.matt.dropbear.contrib.blacklist' (head 1d86a4f0a401cc68c2670d821a2f6366c37af143)
author Matt Johnston <matt@ucc.asn.au>
date Fri, 10 Mar 2006 06:31:29 +0000
parents 1b9e69c058d2
children
comparison
equal deleted inserted replaced
247:c07de41b53d7 293:9d110777f345
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file rand_prime.c
15 Generate a random prime, Tom St Denis
16 */
17 #ifdef MPI
18
19 struct rng_data {
20 prng_state *prng;
21 int wprng;
22 };
23
24 static int rand_prime_helper(unsigned char *dst, int len, void *dat)
25 {
26 return (int)prng_descriptor[((struct rng_data *)dat)->wprng].read(dst, len, ((struct rng_data *)dat)->prng);
27 }
28
29 int rand_prime(mp_int *N, long len, prng_state *prng, int wprng)
30 {
31 struct rng_data rng;
32 int type, err;
33
34 LTC_ARGCHK(N != NULL);
35
36 /* allow sizes between 2 and 256 bytes for a prime size */
37 if (len < 16 || len > 4096) {
38 return CRYPT_INVALID_PRIME_SIZE;
39 }
40
41 /* valid PRNG? Better be! */
42 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
43 return err;
44 }
45
46 /* setup our callback data, then world domination! */
47 rng.prng = prng;
48 rng.wprng = wprng;
49
50 /* get type */
51 if (len < 0) {
52 type = LTM_PRIME_BBS;
53 len = -len;
54 } else {
55 type = 0;
56 }
57 type |= LTM_PRIME_2MSB_ON;
58
59 /* New prime generation makes the code even more cryptoish-insane. Do you know what this means!!!
60 -- Gir: Yeah, oh wait, er, no.
61 */
62 return mpi_to_ltc_error(mp_prime_random_ex(N, mp_prime_rabin_miller_trials(len), len, type, rand_prime_helper, &rng));
63 }
64
65 #endif
66
67
68 /* $Source: /cvs/libtom/libtomcrypt/src/misc/mpi/rand_prime.c,v $ */
69 /* $Revision: 1.3 $ */
70 /* $Date: 2005/05/05 14:35:59 $ */