Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_verify_key.c @ 1646:6d1bbe7d5fa5 DROPBEAR_2019.77

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2019.77
author Matt Johnston <matt@ucc.asn.au>
date Sat, 23 Mar 2019 21:46:29 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /**
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12 @file dsa_verify_key.c
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13 DSA implementation, verify a key, Tom St Denis
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14 */
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15
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16 #ifdef LTC_MDSA
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17
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18 /**
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19 Validate a DSA key
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20
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21 Yeah, this function should've been called dsa_validate_key()
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22 in the first place and for compat-reasons we keep it
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23 as it was (for now).
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24
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25 @param key The key to validate
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26 @param stat [out] Result of test, 1==valid, 0==invalid
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27 @return CRYPT_OK if successful
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28 */
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29 int dsa_verify_key(dsa_key *key, int *stat)
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30 {
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31 int err;
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32
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33 err = dsa_int_validate_primes(key, stat);
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34 if (err != CRYPT_OK || *stat == 0) return err;
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35
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36 err = dsa_int_validate_pqg(key, stat);
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37 if (err != CRYPT_OK || *stat == 0) return err;
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38
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39 return dsa_int_validate_xy(key, stat);
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40 }
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41
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42 /**
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43 Non-complex part (no primality testing) of the validation
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44 of DSA params (p, q, g)
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45
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46 @param key The key to validate
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47 @param stat [out] Result of test, 1==valid, 0==invalid
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48 @return CRYPT_OK if successful
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49 */
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50 int dsa_int_validate_pqg(dsa_key *key, int *stat)
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51 {
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52 void *tmp1, *tmp2;
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53 int err;
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54
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55 LTC_ARGCHK(key != NULL);
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56 LTC_ARGCHK(stat != NULL);
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57 *stat = 0;
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58
1471
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59 /* check q-order */
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60 if ( key->qord >= LTC_MDSA_MAX_GROUP || key->qord <= 15 ||
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61 (unsigned long)key->qord >= mp_unsigned_bin_size(key->p) ||
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62 (mp_unsigned_bin_size(key->p) - key->qord) >= LTC_MDSA_DELTA ) {
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63 return CRYPT_OK;
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64 }
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65
1471
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66 /* FIPS 186-4 chapter 4.1: 1 < g < p */
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67 if (mp_cmp_d(key->g, 1) != LTC_MP_GT || mp_cmp(key->g, key->p) != LTC_MP_LT) {
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68 return CRYPT_OK;
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69 }
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70
1471
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71 if ((err = mp_init_multi(&tmp1, &tmp2, NULL)) != CRYPT_OK) { return err; }
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72
1471
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73 /* FIPS 186-4 chapter 4.1: q is a divisor of (p - 1) */
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74 if ((err = mp_sub_d(key->p, 1, tmp1)) != CRYPT_OK) { goto error; }
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75 if ((err = mp_div(tmp1, key->q, tmp1, tmp2)) != CRYPT_OK) { goto error; }
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76 if (mp_iszero(tmp2) != LTC_MP_YES) {
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77 err = CRYPT_OK;
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78 goto error;
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79 }
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80
1471
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81 /* FIPS 186-4 chapter 4.1: g is a generator of a subgroup of order q in
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82 * the multiplicative group of GF(p) - so we make sure that g^q mod p = 1
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83 */
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84 if ((err = mp_exptmod(key->g, key->q, key->p, tmp1)) != CRYPT_OK) { goto error; }
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85 if (mp_cmp_d(tmp1, 1) != LTC_MP_EQ) {
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86 err = CRYPT_OK;
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87 goto error;
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88 }
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89
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90 err = CRYPT_OK;
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91 *stat = 1;
1471
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92 error:
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93 mp_clear_multi(tmp2, tmp1, NULL);
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94 return err;
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95 }
1471
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96
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97 /**
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98 Primality testing of DSA params p and q
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99
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100 @param key The key to validate
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101 @param stat [out] Result of test, 1==valid, 0==invalid
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102 @return CRYPT_OK if successful
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103 */
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104 int dsa_int_validate_primes(dsa_key *key, int *stat)
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105 {
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106 int err, res;
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107
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108 *stat = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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109 LTC_ARGCHK(key != NULL);
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110 LTC_ARGCHK(stat != NULL);
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111
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112 /* key->q prime? */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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113 if ((err = mp_prime_is_prime(key->q, LTC_MILLER_RABIN_REPS, &res)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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114 return err;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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115 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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116 if (res == LTC_MP_NO) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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117 return CRYPT_OK;
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118 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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119
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120 /* key->p prime? */
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121 if ((err = mp_prime_is_prime(key->p, LTC_MILLER_RABIN_REPS, &res)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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122 return err;
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123 }
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124 if (res == LTC_MP_NO) {
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125 return CRYPT_OK;
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126 }
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127
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128 *stat = 1;
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129 return CRYPT_OK;
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130 }
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131
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132 /**
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133 Validation of a DSA key (x and y values)
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134
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135 @param key The key to validate
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136 @param stat [out] Result of test, 1==valid, 0==invalid
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137 @return CRYPT_OK if successful
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138 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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139 int dsa_int_validate_xy(dsa_key *key, int *stat)
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140 {
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diff changeset
141 void *tmp;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
142 int err;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
143
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
144 *stat = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
145 LTC_ARGCHK(key != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
146 LTC_ARGCHK(stat != NULL);
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diff changeset
147
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
148 /* 1 < y < p-1 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
149 if ((err = mp_init(&tmp)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
150 return err;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
151 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
152 if ((err = mp_sub_d(key->p, 1, tmp)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
153 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
154 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
155 if (mp_cmp_d(key->y, 1) != LTC_MP_GT || mp_cmp(key->y, tmp) != LTC_MP_LT) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
156 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
157 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
158 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
159
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
160 if (key->type == PK_PRIVATE) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
161 /* FIPS 186-4 chapter 4.1: 0 < x < q */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
162 if (mp_cmp_d(key->x, 0) != LTC_MP_GT || mp_cmp(key->x, key->q) != LTC_MP_LT) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
163 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
164 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
165 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
166 /* FIPS 186-4 chapter 4.1: y = g^x mod p */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
167 if ((err = mp_exptmod(key->g, key->x, key->p, tmp)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
168 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
169 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
170 if (mp_cmp(tmp, key->y) != LTC_MP_EQ) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
171 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
172 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
173 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
174 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
175 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
176 /* with just a public key we cannot test y = g^x mod p therefore we
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
177 * only test that y^q mod p = 1, which makes sure y is in g^x mod p
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
178 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
179 if ((err = mp_exptmod(key->y, key->q, key->p, tmp)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
180 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
181 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
182 if (mp_cmp_d(tmp, 1) != LTC_MP_EQ) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
183 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
184 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
185 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
186 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
187
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
188 err = CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
189 *stat = 1;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
190 error:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
191 mp_clear(tmp);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
192 return err;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
193 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
194
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
197 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
198 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
199 /* commit time: $Format:%ai$ */