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annotate libtomcrypt/src/pk/dh/dh_set.c @ 1730:57226fc75cb5

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Some notes on style
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 20:41:34 +0800
parents 6dba84798cd5
children
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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 /**
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15 Import DH key parts p and g from raw numbers
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16
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17 @param p DH's p (prime)
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18 @param plen DH's p's length
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19 @param g DH's g (group)
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20 @param glen DH's g's length
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21 @param key [out] the destination for the imported key
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22 @return CRYPT_OK if successful
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23 */
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24 int dh_set_pg(const unsigned char *p, unsigned long plen,
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25 const unsigned char *g, unsigned long glen,
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26 dh_key *key)
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27 {
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28 int err;
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29
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30 LTC_ARGCHK(key != NULL);
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31 LTC_ARGCHK(p != NULL);
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32 LTC_ARGCHK(g != NULL);
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33 LTC_ARGCHK(ltc_mp.name != NULL);
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34
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35 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 if ((err = mp_read_unsigned_bin(key->base, (unsigned char*)g, glen)) != CRYPT_OK) { goto LBL_ERR; }
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40 if ((err = mp_read_unsigned_bin(key->prime, (unsigned char*)p, plen)) != CRYPT_OK) { goto LBL_ERR; }
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41
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42 return CRYPT_OK;
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43
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44 LBL_ERR:
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45 dh_free(key);
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46 return err;
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47 }
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48
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49 /**
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50 Import DH key parts p and g from built-in DH groups
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51
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52 @param groupsize The size of the DH group to use
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53 @param key [out] Where the newly created DH key will be stored
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54 @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically.
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55 */
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56 int dh_set_pg_groupsize(int groupsize, dh_key *key)
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57 {
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58 int err, i;
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59
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60 LTC_ARGCHK(key != NULL);
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61 LTC_ARGCHK(ltc_mp.name != NULL);
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62 LTC_ARGCHK(groupsize > 0);
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63
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64 for (i = 0; (groupsize > ltc_dh_sets[i].size) && (ltc_dh_sets[i].size != 0); i++);
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65 if (ltc_dh_sets[i].size == 0) return CRYPT_INVALID_KEYSIZE;
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66
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67 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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68 return err;
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69 }
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70 if ((err = mp_read_radix(key->base, ltc_dh_sets[i].base, 16)) != CRYPT_OK) { goto LBL_ERR; }
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71 if ((err = mp_read_radix(key->prime, ltc_dh_sets[i].prime, 16)) != CRYPT_OK) { goto LBL_ERR; }
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72
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73 return CRYPT_OK;
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74
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75 LBL_ERR:
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76 dh_free(key);
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77 return err;
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78 }
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79
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80 /**
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81 Import DH public or private key part from raw numbers
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82
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83 NB: The p & g parts must be set beforehand
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84
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85 @param in The key-part to import, either public or private.
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86 @param inlen The key-part's length
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87 @param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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88 @param key [out] the destination for the imported key
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89 @return CRYPT_OK if successful
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90 */
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91 int dh_set_key(const unsigned char *in, unsigned long inlen, int type, dh_key *key)
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92 {
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93 int err;
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94
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95 LTC_ARGCHK(key != NULL);
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96 LTC_ARGCHK(ltc_mp.name != NULL);
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97
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98 if (type == PK_PRIVATE) {
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99 key->type = PK_PRIVATE;
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100 if ((err = mp_read_unsigned_bin(key->x, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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101 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto LBL_ERR; }
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102 }
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103 else {
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104 key->type = PK_PUBLIC;
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105 if ((err = mp_read_unsigned_bin(key->y, (unsigned char*)in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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106 }
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107
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108 /* check public key */
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109 if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
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110 goto LBL_ERR;
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111 }
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112
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113 return CRYPT_OK;
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114
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115 LBL_ERR:
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116 dh_free(key);
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117 return err;
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118 }
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119
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120 #endif /* LTC_MDH */
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121
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122 /* ref: $Format:%D$ */
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123 /* git commit: $Format:%H$ */
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124 /* commit time: $Format:%ai$ */