Mercurial > dropbear

annotate libtomcrypt/src/math/rand_prime.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
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 #include "tomcrypt.h"
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10
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11 #if defined(LTC_MRSA) || (!defined(LTC_NO_MATH) && !defined(LTC_NO_PRNGS))
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12
382
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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
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18 #define USE_BBS 1
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19
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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39
382
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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61
382
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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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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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69 if ((err = mp_prime_is_prime(N, LTC_MILLER_RABIN_REPS, &res)) != CRYPT_OK) {
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70 XFREE(buf);
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71 return err;
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72 }
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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
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79 XFREE(buf);
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80 return CRYPT_OK;
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81 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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82
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 #endif /* LTC_NO_MATH */
382
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84
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85
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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86 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* commit time: $Format:%ai$ */