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annotate libtomcrypt/src/math/rand_bn.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
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: $Format:%ai$ */