Mercurial > dropbear

annotate libtomcrypt/src/math/rand_prime.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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diff changeset
2 *
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diff changeset
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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diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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diff changeset
11 #include "tomcrypt.h"
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12
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13 /**
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diff changeset
14 @file rand_prime.c
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diff changeset
15 Generate a random prime, Tom St Denis
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16 */
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17
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18 #define USE_BBS 1
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19
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diff changeset
20 int rand_prime(void *N, long len, prng_state *prng, int wprng)
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21 {
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22 int err, res, type;
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23 unsigned char *buf;
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24
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25 LTC_ARGCHK(N != NULL);
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26
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27 /* get type */
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28 if (len < 0) {
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29 type = USE_BBS;
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30 len = -len;
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31 } else {
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32 type = 0;
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33 }
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34
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35 /* allow sizes between 2 and 512 bytes for a prime size */
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36 if (len < 2 || len > 512) {
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37 return CRYPT_INVALID_PRIME_SIZE;
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38 }
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39
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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40 /* valid PRNG? Better be! */
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41 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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45 /* allocate buffer to work with */
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46 buf = XCALLOC(1, len);
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47 if (buf == NULL) {
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48 return CRYPT_MEM;
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49 }
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50
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51 do {
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52 /* generate value */
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53 if (prng_descriptor[wprng].read(buf, len, prng) != (unsigned long)len) {
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54 XFREE(buf);
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55 return CRYPT_ERROR_READPRNG;
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56 }
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57
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58 /* munge bits */
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59 buf[0] |= 0x80 | 0x40;
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60 buf[len-1] |= 0x01 | ((type & USE_BBS) ? 0x02 : 0x00);
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61
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62 /* load value */
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63 if ((err = mp_read_unsigned_bin(N, buf, len)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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64 XFREE(buf);
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65 return err;
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66 }
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67
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68 /* test */
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69 if ((err = mp_prime_is_prime(N, 8, &res)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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70 XFREE(buf);
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71 return err;
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72 }
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Matt Johnston <matt@ucc.asn.au>
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73 } while (res == LTC_MP_NO);
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74
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75 #ifdef LTC_CLEAN_STACK
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76 zeromem(buf, len);
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77 #endif
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78
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
79 XFREE(buf);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
80 return CRYPT_OK;
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81 }
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82
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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83
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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84
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
diff changeset
85 /* $Source: /cvs/libtom/libtomcrypt/src/math/rand_prime.c,v $ */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
86 /* $Revision: 1.6 $ */
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Matt Johnston <matt@ucc.asn.au>
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87 /* $Date: 2006/03/31 14:15:35 $ */