Mercurial > dropbear

annotate libtomcrypt/src/misc/mpi/rand_prime.c @ 409:0e69e948caba

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Add comments about requiring keysize <= 2*SHA1_HASH_SIZE
author Matt Johnston <matt@ucc.asn.au>
date Sun, 04 Feb 2007 10:31:48 +0000
parents 1b9e69c058d2
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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13 /**
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14 @file rand_prime.c
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15 Generate a random prime, Tom St Denis
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16 */
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17 #ifdef MPI
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19 struct rng_data {
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20 prng_state *prng;
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21 int wprng;
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22 };
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24 static int rand_prime_helper(unsigned char *dst, int len, void *dat)
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25 {
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26 return (int)prng_descriptor[((struct rng_data *)dat)->wprng].read(dst, len, ((struct rng_data *)dat)->prng);
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27 }
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29 int rand_prime(mp_int *N, long len, prng_state *prng, int wprng)
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30 {
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31 struct rng_data rng;
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32 int type, err;
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34 LTC_ARGCHK(N != NULL);
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36 /* allow sizes between 2 and 256 bytes for a prime size */
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37 if (len < 16 || len > 4096) {
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38 return CRYPT_INVALID_PRIME_SIZE;
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39 }
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41 /* valid PRNG? Better be! */
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42 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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43 return err;
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44 }
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46 /* setup our callback data, then world domination! */
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47 rng.prng = prng;
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48 rng.wprng = wprng;
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49
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50 /* get type */
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51 if (len < 0) {
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52 type = LTM_PRIME_BBS;
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53 len = -len;
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54 } else {
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55 type = 0;
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56 }
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57 type |= LTM_PRIME_2MSB_ON;
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58
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59 /* New prime generation makes the code even more cryptoish-insane. Do you know what this means!!!
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60 -- Gir: Yeah, oh wait, er, no.
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61 */
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62 return mpi_to_ltc_error(mp_prime_random_ex(N, mp_prime_rabin_miller_trials(len), len, type, rand_prime_helper, &rng));
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63 }
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65 #endif
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68 /* $Source: /cvs/libtom/libtomcrypt/src/misc/mpi/rand_prime.c,v $ */
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69 /* $Revision: 1.3 $ */
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70 /* $Date: 2005/05/05 14:35:59 $ */