Mercurial > dropbear

annotate dss.c @ 330:5488db2e9e4e

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merge of 332f709a4cb39cde4cedab7c3be89e05f3023067 and ca4ca78b82c5d430c69ce01bf794e8886ce81431
author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Jun 2006 16:39:40 +0000
parents c5d3ef11155f
children 454a34b2dfd1 ed910547d449
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "bignum.h"
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28 #include "dss.h"
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29 #include "buffer.h"
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30 #include "ssh.h"
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31 #include "random.h"
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32
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33 /* Handle DSS (Digital Signature Standard), aka DSA (D.S. Algorithm),
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34 * operations, such as key reading, signing, verification. Key generation
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35 * is in gendss.c, since it isn't required in the server itself.
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36 *
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37 * See FIPS186 or the Handbook of Applied Cryptography for details of the
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38 * algorithm */
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39
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40 #ifdef DROPBEAR_DSS
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41
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42 /* Load a dss key from a buffer, initialising the values.
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43 * The key will have the same format as buf_put_dss_key.
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44 * These should be freed with dss_key_free.
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45 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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46 int buf_get_dss_pub_key(buffer* buf, dss_key *key) {
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47
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48 TRACE(("enter buf_get_dss_pub_key"))
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49 dropbear_assert(key != NULL);
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50 key->p = m_malloc(sizeof(mp_int));
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51 key->q = m_malloc(sizeof(mp_int));
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52 key->g = m_malloc(sizeof(mp_int));
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53 key->y = m_malloc(sizeof(mp_int));
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54 m_mp_init_multi(key->p, key->q, key->g, key->y, NULL);
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55 key->x = NULL;
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56
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57 buf_incrpos(buf, 4+SSH_SIGNKEY_DSS_LEN); /* int + "ssh-dss" */
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58 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE
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59 || buf_getmpint(buf, key->q) == DROPBEAR_FAILURE
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60 || buf_getmpint(buf, key->g) == DROPBEAR_FAILURE
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61 || buf_getmpint(buf, key->y) == DROPBEAR_FAILURE) {
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62 TRACE(("leave buf_get_dss_pub_key: failed reading mpints"))
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63 return DROPBEAR_FAILURE;
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64 }
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65
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66 if (mp_count_bits(key->p) < MIN_DSS_KEYLEN) {
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67 dropbear_log(LOG_WARNING, "DSS key too short");
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68 TRACE(("leave buf_get_dss_pub_key: short key"))
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69 return DROPBEAR_FAILURE;
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70 }
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71
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72 TRACE(("leave buf_get_dss_pub_key: success"))
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73 return DROPBEAR_SUCCESS;
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74 }
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75
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76 /* Same as buf_get_dss_pub_key, but reads a private "x" key at the end.
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77 * Loads a private dss key from a buffer
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78 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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79 int buf_get_dss_priv_key(buffer* buf, dss_key *key) {
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80
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81 int ret = DROPBEAR_FAILURE;
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82
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83 dropbear_assert(key != NULL);
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84
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85 ret = buf_get_dss_pub_key(buf, key);
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86 if (ret == DROPBEAR_FAILURE) {
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87 return DROPBEAR_FAILURE;
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88 }
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89
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90 key->x = m_malloc(sizeof(mp_int));
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91 m_mp_init(key->x);
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92 ret = buf_getmpint(buf, key->x);
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93
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94 return ret;
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95 }
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96
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97
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98 /* Clear and free the memory used by a public or private key */
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99 void dss_key_free(dss_key *key) {
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100
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101 TRACE(("enter dsa_key_free"))
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102 if (key == NULL) {
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103 TRACE(("enter dsa_key_free: key == NULL"))
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104 return;
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105 }
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106 if (key->p) {
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107 mp_clear(key->p);
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108 m_free(key->p);
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109 }
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110 if (key->q) {
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111 mp_clear(key->q);
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112 m_free(key->q);
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113 }
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114 if (key->g) {
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115 mp_clear(key->g);
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116 m_free(key->g);
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117 }
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118 if (key->y) {
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119 mp_clear(key->y);
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120 m_free(key->y);
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121 }
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122 if (key->x) {
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123 mp_clear(key->x);
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124 m_free(key->x);
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125 }
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126 m_free(key);
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127 TRACE(("leave dsa_key_free"))
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128 }
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129
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130 /* put the dss public key into the buffer in the required format:
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131 *
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132 * string "ssh-dss"
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133 * mpint p
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134 * mpint q
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135 * mpint g
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136 * mpint y
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137 */
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138 void buf_put_dss_pub_key(buffer* buf, dss_key *key) {
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139
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140 dropbear_assert(key != NULL);
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141 buf_putstring(buf, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN);
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142 buf_putmpint(buf, key->p);
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143 buf_putmpint(buf, key->q);
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144 buf_putmpint(buf, key->g);
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145 buf_putmpint(buf, key->y);
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146
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147 }
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parents:
diff changeset
148
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parents:
diff changeset
149 /* Same as buf_put_dss_pub_key, but with the private "x" key appended */
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parents:
diff changeset
150 void buf_put_dss_priv_key(buffer* buf, dss_key *key) {
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parents:
diff changeset
151
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 188
diff changeset
152 dropbear_assert(key != NULL);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
153 buf_put_dss_pub_key(buf, key);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 buf_putmpint(buf, key->x);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 #ifdef DROPBEAR_SIGNKEY_VERIFY
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 /* Verify a DSS signature (in buf) made on data by the key given.
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 * returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 int buf_dss_verify(buffer* buf, dss_key *key, const unsigned char* data,
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
162 unsigned int len) {
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parents:
diff changeset
163
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 unsigned char msghash[SHA1_HASH_SIZE];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
165 hash_state hs;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 int ret = DROPBEAR_FAILURE;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
167 DEF_MP_INT(val1);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
168 DEF_MP_INT(val2);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
169 DEF_MP_INT(val3);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
170 DEF_MP_INT(val4);
4
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parents:
diff changeset
171 char * string = NULL;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
172 int stringlen;
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parents:
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173
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 150
diff changeset
174 TRACE(("enter buf_dss_verify"))
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 188
diff changeset
175 dropbear_assert(key != NULL);
4
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parents:
diff changeset
176
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
177 m_mp_init_multi(&val1, &val2, &val3, &val4, NULL);
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
178
4
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parents:
diff changeset
179 /* get blob, check length */
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parents:
diff changeset
180 string = buf_getstring(buf, &stringlen);
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parents:
diff changeset
181 if (stringlen != 2*SHA1_HASH_SIZE) {
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parents:
diff changeset
182 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 }
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parents:
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184
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 /* hash the data */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 sha1_init(&hs);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 sha1_process(&hs, data, len);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 sha1_done(&hs, msghash);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 /* create the signature - s' and r' are the received signatures in buf */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 /* w = (s')-1 mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 /* let val1 = s' */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
193 bytes_to_mp(&val1, &string[SHA1_HASH_SIZE], SHA1_HASH_SIZE);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
194
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 if (mp_cmp(&val1, key->q) != MP_LT) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 150
diff changeset
196 TRACE(("verify failed, s' >= q"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 /* let val2 = w = (s')^-1 mod q*/
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 if (mp_invmod(&val1, key->q, &val2) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 /* u1 = ((SHA(M')w) mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 /* let val1 = SHA(M') = msghash */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
206 bytes_to_mp(&val1, msghash, SHA1_HASH_SIZE);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
207
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 /* let val3 = u1 = ((SHA(M')w) mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 if (mp_mulmod(&val1, &val2, key->q, &val3) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213 /* u2 = ((r')w) mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 /* let val1 = r' */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
215 bytes_to_mp(&val1, &string[0], SHA1_HASH_SIZE);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 if (mp_cmp(&val1, key->q) != MP_LT) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 150
diff changeset
217 TRACE(("verify failed, r' >= q"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 /* let val4 = u2 = ((r')w) mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 if (mp_mulmod(&val1, &val2, key->q, &val4) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 /* v = (((g)^u1 (y)^u2) mod p) mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 /* val2 = g^u1 mod p */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 if (mp_exptmod(key->g, &val3, key->p, &val2) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 /* val3 = y^u2 mod p */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 if (mp_exptmod(key->y, &val4, key->p, &val3) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 /* val4 = ((g)^u1 (y)^u2) mod p */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 if (mp_mulmod(&val2, &val3, key->p, &val4) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 /* val2 = v = (((g)^u1 (y)^u2) mod p) mod q */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 if (mp_mod(&val4, key->q, &val2) != MP_OKAY) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 /* check whether signatures verify */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 if (mp_cmp(&val2, &val1) == MP_EQ) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 /* good sig */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 ret = DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 mp_clear_multi(&val1, &val2, &val3, &val4, NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 m_free(string);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 return ret;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 #endif /* DROPBEAR_SIGNKEY_VERIFY */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
258 #ifdef DSS_PROTOK
150
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
259 /* convert an unsigned mp into an array of bytes, malloced.
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
260 * This array must be freed after use, len contains the length of the array,
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
261 * if len != NULL */
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
262 static unsigned char* mptobytes(mp_int *mp, int *len) {
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
263
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
264 unsigned char* ret;
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
265 int size;
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
266
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
267 size = mp_unsigned_bin_size(mp);
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
268 ret = m_malloc(size);
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
269 if (mp_to_unsigned_bin(mp, ret) != MP_OKAY) {
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
270 dropbear_exit("mem alloc error");
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
271 }
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
272 if (len != NULL) {
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
273 *len = size;
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
274 }
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
275 return ret;
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
276 }
179
161557a9dde8 * fix longstanding bug with connections being closed on failure to
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
277 #endif
150
82fcf3185616 Cleaning out various dead wood found with -dead_strip
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
278
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 /* Sign the data presented with key, writing the signature contents
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280 * to the buffer
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
281 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282 * When DSS_PROTOK is #defined:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
283 * The alternate k generation method is based on the method used in PuTTY.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
284 * In particular to avoid being vulnerable to attacks using flaws in random
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
285 * generation of k, we use the following:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
286 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
287 * proto_k = SHA512 ( SHA512(x) || SHA160(message) )
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
288 * k = proto_k mod q
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
289 *
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
290 * Now we aren't relying on the random number generation to protect the private
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
291 * key x, which is a long term secret */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
292 void buf_put_dss_sign(buffer* buf, dss_key *key, const unsigned char* data,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
293 unsigned int len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
294
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
295 unsigned char msghash[SHA1_HASH_SIZE];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
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296 unsigned int writelen;
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297 unsigned int i;
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298 #ifdef DSS_PROTOK
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299 unsigned char privkeyhash[SHA512_HASH_SIZE];
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300 unsigned char *privkeytmp;
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301 unsigned char proto_k[SHA512_HASH_SIZE];
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302 DEF_MP_INT(dss_protok);
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303 #endif
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304 DEF_MP_INT(dss_k);
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305 DEF_MP_INT(dss_m);
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306 DEF_MP_INT(dss_temp1);
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307 DEF_MP_INT(dss_temp2);
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308 DEF_MP_INT(dss_r);
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309 DEF_MP_INT(dss_s);
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310 hash_state hs;
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311
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312 TRACE(("enter buf_put_dss_sign"))
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313 dropbear_assert(key != NULL);
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314
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315 /* hash the data */
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316 sha1_init(&hs);
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317 sha1_process(&hs, data, len);
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318 sha1_done(&hs, msghash);
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319
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320 m_mp_init_multi(&dss_k, &dss_temp1, &dss_temp2, &dss_r, &dss_s,
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321 &dss_m, NULL);
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322 #ifdef DSS_PROTOK
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323 /* hash the privkey */
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324 privkeytmp = mptobytes(key->x, &i);
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325 sha512_init(&hs);
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326 sha512_process(&hs, "the quick brown fox jumped over the lazy dog", 44);
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327 sha512_process(&hs, privkeytmp, i);
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328 sha512_done(&hs, privkeyhash);
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329 m_burn(privkeytmp, i);
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330 m_free(privkeytmp);
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331
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332 /* calculate proto_k */
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333 sha512_init(&hs);
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334 sha512_process(&hs, privkeyhash, SHA512_HASH_SIZE);
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335 sha512_process(&hs, msghash, SHA1_HASH_SIZE);
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336 sha512_done(&hs, proto_k);
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337
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338 /* generate k */
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339 m_mp_init(&dss_protok);
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340 bytes_to_mp(&dss_protok, proto_k, SHA512_HASH_SIZE);
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341 mp_mod(&dss_protok, key->q, &dss_k);
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342 mp_clear(&dss_protok);
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343 m_burn(proto_k, SHA512_HASH_SIZE);
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344 #else /* DSS_PROTOK not defined*/
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345 gen_random_mpint(key->q, &dss_k);
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346 #endif
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347
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348 /* now generate the actual signature */
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349 bytes_to_mp(&dss_m, msghash, SHA1_HASH_SIZE);
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350
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351 /* g^k mod p */
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352 if (mp_exptmod(key->g, &dss_k, key->p, &dss_temp1) != MP_OKAY) {
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353 dropbear_exit("dss error");
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354 }
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355 /* r = (g^k mod p) mod q */
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356 if (mp_mod(&dss_temp1, key->q, &dss_r) != MP_OKAY) {
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357 dropbear_exit("dss error");
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358 }
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359
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360 /* x*r mod q */
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361 if (mp_mulmod(&dss_r, key->x, key->q, &dss_temp1) != MP_OKAY) {
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362 dropbear_exit("dss error");
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363 }
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364 /* (SHA1(M) + xr) mod q) */
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365 if (mp_addmod(&dss_m, &dss_temp1, key->q, &dss_temp2) != MP_OKAY) {
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366 dropbear_exit("dss error");
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367 }
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368
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369 /* (k^-1) mod q */
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370 if (mp_invmod(&dss_k, key->q, &dss_temp1) != MP_OKAY) {
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371 dropbear_exit("dss error");
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372 }
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373
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374 /* s = (k^-1(SHA1(M) + xr)) mod q */
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375 if (mp_mulmod(&dss_temp1, &dss_temp2, key->q, &dss_s) != MP_OKAY) {
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376 dropbear_exit("dss error");
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377 }
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378
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379 buf_putstring(buf, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN);
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380 buf_putint(buf, 2*SHA1_HASH_SIZE);
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381
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382 writelen = mp_unsigned_bin_size(&dss_r);
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383 dropbear_assert(writelen <= SHA1_HASH_SIZE);
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384 /* need to pad to 160 bits with leading zeros */
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385 for (i = 0; i < SHA1_HASH_SIZE - writelen; i++) {
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386 buf_putbyte(buf, 0);
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387 }
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388 if (mp_to_unsigned_bin(&dss_r, buf_getwriteptr(buf, writelen))
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389 != MP_OKAY) {
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390 dropbear_exit("dss error");
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391 }
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392 mp_clear(&dss_r);
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393 buf_incrwritepos(buf, writelen);
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394
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395 writelen = mp_unsigned_bin_size(&dss_s);
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396 dropbear_assert(writelen <= SHA1_HASH_SIZE);
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397 /* need to pad to 160 bits with leading zeros */
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398 for (i = 0; i < SHA1_HASH_SIZE - writelen; i++) {
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399 buf_putbyte(buf, 0);
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400 }
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401 if (mp_to_unsigned_bin(&dss_s, buf_getwriteptr(buf, writelen))
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402 != MP_OKAY) {
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403 dropbear_exit("dss error");
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404 }
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405 mp_clear(&dss_s);
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406 buf_incrwritepos(buf, writelen);
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407
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408 mp_clear_multi(&dss_k, &dss_temp1, &dss_temp2, &dss_r, &dss_s,
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409 &dss_m, NULL);
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410
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411 /* create the signature to return */
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412
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413 TRACE(("leave buf_put_dss_sign"))
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414 }
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415
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416 #endif /* DROPBEAR_DSS */