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annotate libtomcrypt/src/pk/dh/dh_generate_key.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
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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 static int _dh_groupsize_to_keysize(int groupsize)
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15 {
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16 /* The strength estimates from https://tools.ietf.org/html/rfc3526#section-8
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17 * We use "Estimate 2" to get an appropriate private key (exponent) size.
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18 */
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19 if (groupsize <= 0) {
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20 return 0;
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21 }
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22 else if (groupsize <= 192) {
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23 return 30; /* 1536-bit => key size 240-bit */
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24 }
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25 else if (groupsize <= 256) {
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26 return 40; /* 2048-bit => key size 320-bit */
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27 }
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28 else if (groupsize <= 384) {
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29 return 52; /* 3072-bit => key size 416-bit */
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30 }
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31 else if (groupsize <= 512) {
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32 return 60; /* 4096-bit => key size 480-bit */
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33 }
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34 else if (groupsize <= 768) {
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35 return 67; /* 6144-bit => key size 536-bit */
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36 }
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37 else if (groupsize <= 1024) {
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38 return 77; /* 8192-bit => key size 616-bit */
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39 }
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40 else {
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41 return 0;
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42 }
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43 }
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44
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45 int dh_generate_key(prng_state *prng, int wprng, dh_key *key)
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46 {
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47 unsigned char *buf;
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48 unsigned long keysize;
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49 int err, max_iterations = LTC_PK_MAX_RETRIES;
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50
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51 LTC_ARGCHK(key != NULL);
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52 LTC_ARGCHK(ltc_mp.name != NULL);
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53
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54 /* good prng? */
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55 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 keysize = _dh_groupsize_to_keysize(mp_unsigned_bin_size(key->prime));
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60 if (keysize == 0) {
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61 err = CRYPT_INVALID_KEYSIZE;
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62 goto freemp;
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63 }
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64
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65 /* allocate buffer */
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66 buf = XMALLOC(keysize);
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67 if (buf == NULL) {
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68 err = CRYPT_MEM;
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69 goto freemp;
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70 }
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71
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72 key->type = PK_PRIVATE;
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73 do {
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74 /* make up random buf */
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75 if (prng_descriptor[wprng].read(buf, keysize, prng) != keysize) {
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76 err = CRYPT_ERROR_READPRNG;
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77 goto freebuf;
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78 }
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79 /* load the x value - private key */
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80 if ((err = mp_read_unsigned_bin(key->x, buf, keysize)) != CRYPT_OK) {
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81 goto freebuf;
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82 }
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83 /* compute the y value - public key */
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84 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) {
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85 goto freebuf;
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86 }
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87 err = dh_check_pubkey(key);
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88 } while (err != CRYPT_OK && max_iterations-- > 0);
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89
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90 freebuf:
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91 zeromem(buf, keysize);
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92 XFREE(buf);
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93 freemp:
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94 if (err != CRYPT_OK) dh_free(key);
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95 return err;
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96 }
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97
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98 #endif /* LTC_MDH */
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99
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100 /* ref: $Format:%D$ */
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101 /* git commit: $Format:%H$ */
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102 /* commit time: $Format:%ai$ */