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annotate libtomcrypt/src/math/rand_bn.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children e9dba7abd939
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 #ifdef LTC_MDSA
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12 /**
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13 Generate a random number N with given bitlength (note: MSB can be 0)
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14 */
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15
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16 int rand_bn_bits(void *N, int bits, prng_state *prng, int wprng)
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17 {
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18 int res, bytes;
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19 unsigned char *buf, mask;
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20
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21 LTC_ARGCHK(N != NULL);
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22 LTC_ARGCHK(bits > 1);
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23
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24 /* check PRNG */
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25 if ((res = prng_is_valid(wprng)) != CRYPT_OK) return res;
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26
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27 bytes = (bits+7) >> 3;
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28 mask = 0xff << (8 - bits % 8);
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29
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30 /* allocate buffer */
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31 if ((buf = XCALLOC(1, bytes)) == NULL) return CRYPT_MEM;
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32
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33 /* generate random bytes */
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34 if (prng_descriptor[wprng].read(buf, bytes, prng) != (unsigned long)bytes) {
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35 res = CRYPT_ERROR_READPRNG;
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36 goto cleanup;
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37 }
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38 /* mask bits */
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39 buf[0] &= ~mask;
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40 /* load value */
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41 if ((res = mp_read_unsigned_bin(N, buf, bytes)) != CRYPT_OK) goto cleanup;
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42
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43 res = CRYPT_OK;
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44
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45 cleanup:
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46 #ifdef LTC_CLEAN_STACK
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47 zeromem(buf, bytes);
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48 #endif
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49 XFREE(buf);
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50 return res;
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51 }
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52
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53 /**
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54 Generate a random number N in a range: 1 <= N < limit
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55 */
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56 int rand_bn_upto(void *N, void *limit, prng_state *prng, int wprng)
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57 {
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58 int res, bits;
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59
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60 LTC_ARGCHK(N != NULL);
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61 LTC_ARGCHK(limit != NULL);
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62
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63 bits = mp_count_bits(limit);
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64 do {
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65 res = rand_bn_bits(N, bits, prng, wprng);
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66 if (res != CRYPT_OK) return res;
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67 } while (mp_cmp_d(N, 0) != LTC_MP_GT || mp_cmp(N, limit) != LTC_MP_LT);
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68
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69 return CRYPT_OK;
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70 }
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71 #endif
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72
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73 /* ref: $Format:%D$ */
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74 /* git commit: $Format:%H$ */
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75 /* commit time: $Format:%ai$ */