annotate dss.c @ 1409:c721e8c42d2a

add m_mp_free_multi, be more careful freeing when failing to load keys
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 May 2017 21:08:43 +0800
parents 750ec4ec4cbe
children 771e4a7051e0
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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 "dbrandom.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 #if 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, dropbear_dss_key *key) {
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47 int ret = DROPBEAR_FAILURE;
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48
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49 TRACE(("enter buf_get_dss_pub_key"))
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50 dropbear_assert(key != NULL);
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51 m_mp_alloc_init_multi(&key->p, &key->q, &key->g, &key->y, NULL);
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52 key->x = NULL;
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53
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54 buf_incrpos(buf, 4+SSH_SIGNKEY_DSS_LEN); /* int + "ssh-dss" */
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55 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE
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56 || buf_getmpint(buf, key->q) == DROPBEAR_FAILURE
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57 || buf_getmpint(buf, key->g) == DROPBEAR_FAILURE
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58 || buf_getmpint(buf, key->y) == DROPBEAR_FAILURE) {
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59 TRACE(("leave buf_get_dss_pub_key: failed reading mpints"))
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60 ret = DROPBEAR_FAILURE;
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61 goto out;
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62 }
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63
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64 if (mp_count_bits(key->p) < MIN_DSS_KEYLEN) {
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65 dropbear_log(LOG_WARNING, "DSS key too short");
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66 TRACE(("leave buf_get_dss_pub_key: short key"))
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67 ret = DROPBEAR_FAILURE;
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68 goto out;
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69 }
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70
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71 ret = DROPBEAR_SUCCESS;
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72 TRACE(("leave buf_get_dss_pub_key: success"))
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73 out:
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74 if (ret == DROPBEAR_FAILURE) {
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75 m_mp_free_multi(&key->p, &key->q, &key->g, &key->y, NULL);
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76 }
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77 return ret;
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78 }
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80 /* Same as buf_get_dss_pub_key, but reads a private "x" key at the end.
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81 * Loads a private dss key from a buffer
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82 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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83 int buf_get_dss_priv_key(buffer* buf, dropbear_dss_key *key) {
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84
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85 int ret = DROPBEAR_FAILURE;
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86
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87 dropbear_assert(key != NULL);
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89 ret = buf_get_dss_pub_key(buf, key);
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90 if (ret == DROPBEAR_FAILURE) {
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91 return DROPBEAR_FAILURE;
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92 }
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93
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94 m_mp_alloc_init_multi(&key->x, NULL);
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95 ret = buf_getmpint(buf, key->x);
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96 if (ret == DROPBEAR_FAILURE) {
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97 m_mp_free_multi(&key->x);
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98 }
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99
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100 return ret;
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101 }
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103
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104 /* Clear and free the memory used by a public or private key */
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105 void dss_key_free(dropbear_dss_key *key) {
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106
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107 TRACE2(("enter dsa_key_free"))
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108 if (key == NULL) {
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109 TRACE2(("enter dsa_key_free: key == NULL"))
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110 return;
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111 }
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112 m_mp_free_multi(&key->p, &key->q, &key->g, &key->y, &key->x, NULL);
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113 m_free(key);
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114 TRACE2(("leave dsa_key_free"))
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115 }
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116
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117 /* put the dss public key into the buffer in the required format:
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118 *
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119 * string "ssh-dss"
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120 * mpint p
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121 * mpint q
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122 * mpint g
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123 * mpint y
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124 */
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125 void buf_put_dss_pub_key(buffer* buf, dropbear_dss_key *key) {
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126
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127 dropbear_assert(key != NULL);
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128 buf_putstring(buf, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN);
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129 buf_putmpint(buf, key->p);
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130 buf_putmpint(buf, key->q);
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131 buf_putmpint(buf, key->g);
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132 buf_putmpint(buf, key->y);
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133
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134 }
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135
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136 /* Same as buf_put_dss_pub_key, but with the private "x" key appended */
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137 void buf_put_dss_priv_key(buffer* buf, dropbear_dss_key *key) {
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139 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 buf_put_dss_pub_key(buf, key);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 buf_putmpint(buf, key->x);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1122
diff changeset
145 #if DROPBEAR_SIGNKEY_VERIFY
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 /* Verify a DSS signature (in buf) made on data by the key given.
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 * returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 696
diff changeset
148 int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 unsigned char msghash[SHA1_HASH_SIZE];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 hash_state hs;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 int ret = DROPBEAR_FAILURE;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
152 DEF_MP_INT(val1);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
153 DEF_MP_INT(val2);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
154 DEF_MP_INT(val3);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
155 DEF_MP_INT(val4);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 char * string = NULL;
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 858
diff changeset
157 unsigned int stringlen;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158
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
159 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
160 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
162 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
163
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
164 /* get blob, check length */
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1094
diff changeset
165 string = buf_getstring(buf, &stringlen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 if (stringlen != 2*SHA1_HASH_SIZE) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
169
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
170 /* hash the data */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
171 sha1_init(&hs);
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 696
diff changeset
172 sha1_process(&hs, data_buf->data, data_buf->len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 sha1_done(&hs, msghash);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
174
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 /* create the signature - s' and r' are the received signatures in buf */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
176 /* w = (s')-1 mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
177 /* let val1 = s' */
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 858
diff changeset
178 bytes_to_mp(&val1, (const unsigned char*) &string[SHA1_HASH_SIZE], SHA1_HASH_SIZE);
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
179
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 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
181 TRACE(("verify failed, s' >= q"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
182 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
183 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184 /* let val2 = w = (s')^-1 mod q*/
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 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
186 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 /* u1 = ((SHA(M')w) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
190 /* 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
191 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
192
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 /* let val3 = u1 = ((SHA(M')w) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194 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
195 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
197
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 /* u2 = ((r')w) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 /* let val1 = r' */
1094
c45d65392c1a Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents: 858
diff changeset
200 bytes_to_mp(&val1, (const unsigned char*) &string[0], SHA1_HASH_SIZE);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 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
202 TRACE(("verify failed, r' >= q"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 /* let val4 = u2 = ((r')w) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 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
207 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 /* v = (((g)^u1 (y)^u2) mod p) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 /* val2 = g^u1 mod p */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 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
213 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 /* val3 = y^u2 mod p */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 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
217 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 /* val4 = ((g)^u1 (y)^u2) mod p */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 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
221 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 /* val2 = v = (((g)^u1 (y)^u2) mod p) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 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
225 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 /* check whether signatures verify */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 if (mp_cmp(&val2, &val1) == MP_EQ) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 /* good sig */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 ret = DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 }
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 out:
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 mp_clear_multi(&val1, &val2, &val3, &val4, NULL);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 m_free(string);
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 return ret;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 #endif /* DROPBEAR_SIGNKEY_VERIFY */
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 /* Sign the data presented with key, writing the signature contents
695
94aa1203be1e DSS_PROTOK is not necessary now that private keys are included
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
244 * to the buffer */
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 696
diff changeset
245 void buf_put_dss_sign(buffer* buf, dropbear_dss_key *key, buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 unsigned char msghash[SHA1_HASH_SIZE];
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 unsigned int writelen;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 unsigned int i;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
249 DEF_MP_INT(dss_k);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
250 DEF_MP_INT(dss_m);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
251 DEF_MP_INT(dss_temp1);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
252 DEF_MP_INT(dss_temp2);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
253 DEF_MP_INT(dss_r);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
254 DEF_MP_INT(dss_s);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 hash_state hs;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256
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
257 TRACE(("enter buf_put_dss_sign"))
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 188
diff changeset
258 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 /* hash the data */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 sha1_init(&hs);
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 696
diff changeset
262 sha1_process(&hs, data_buf->data, data_buf->len);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 sha1_done(&hs, msghash);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 m_mp_init_multi(&dss_k, &dss_temp1, &dss_temp2, &dss_r, &dss_s,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 &dss_m, NULL);
695
94aa1203be1e DSS_PROTOK is not necessary now that private keys are included
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
267 /* the random number generator's input has included the private key which
94aa1203be1e DSS_PROTOK is not necessary now that private keys are included
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
268 * avoids DSS's problem of private key exposure due to low entropy */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
269 gen_random_mpint(key->q, &dss_k);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 /* now generate the actual signature */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 186
diff changeset
272 bytes_to_mp(&dss_m, msghash, SHA1_HASH_SIZE);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
273
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
274 /* g^k mod p */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275 if (mp_exptmod(key->g, &dss_k, key->p, &dss_temp1) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
276 dropbear_exit("DSS error");
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
278 /* r = (g^k mod p) mod q */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
279 if (mp_mod(&dss_temp1, key->q, &dss_r) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
280 dropbear_exit("DSS error");
4
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
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283 /* x*r mod q */
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284 if (mp_mulmod(&dss_r, key->x, key->q, &dss_temp1) != MP_OKAY) {
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285 dropbear_exit("DSS error");
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286 }
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287 /* (SHA1(M) + xr) mod q) */
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288 if (mp_addmod(&dss_m, &dss_temp1, key->q, &dss_temp2) != MP_OKAY) {
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289 dropbear_exit("DSS error");
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290 }
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291
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292 /* (k^-1) mod q */
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293 if (mp_invmod(&dss_k, key->q, &dss_temp1) != MP_OKAY) {
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294 dropbear_exit("DSS error");
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295 }
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296
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297 /* s = (k^-1(SHA1(M) + xr)) mod q */
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298 if (mp_mulmod(&dss_temp1, &dss_temp2, key->q, &dss_s) != MP_OKAY) {
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299 dropbear_exit("DSS error");
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300 }
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301
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
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302 buf_putstring(buf, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN);
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303 buf_putint(buf, 2*SHA1_HASH_SIZE);
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304
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305 writelen = mp_unsigned_bin_size(&dss_r);
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306 dropbear_assert(writelen <= SHA1_HASH_SIZE);
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307 /* need to pad to 160 bits with leading zeros */
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308 for (i = 0; i < SHA1_HASH_SIZE - writelen; i++) {
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309 buf_putbyte(buf, 0);
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310 }
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311 if (mp_to_unsigned_bin(&dss_r, buf_getwriteptr(buf, writelen))
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312 != MP_OKAY) {
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313 dropbear_exit("DSS error");
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314 }
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315 mp_clear(&dss_r);
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316 buf_incrwritepos(buf, writelen);
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317
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318 writelen = mp_unsigned_bin_size(&dss_s);
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319 dropbear_assert(writelen <= SHA1_HASH_SIZE);
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320 /* need to pad to 160 bits with leading zeros */
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321 for (i = 0; i < SHA1_HASH_SIZE - writelen; i++) {
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322 buf_putbyte(buf, 0);
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323 }
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324 if (mp_to_unsigned_bin(&dss_s, buf_getwriteptr(buf, writelen))
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325 != MP_OKAY) {
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326 dropbear_exit("DSS error");
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327 }
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328 mp_clear(&dss_s);
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329 buf_incrwritepos(buf, writelen);
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330
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331 mp_clear_multi(&dss_k, &dss_temp1, &dss_temp2, &dss_r, &dss_s,
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332 &dss_m, NULL);
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333
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334 /* create the signature to return */
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335
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336 TRACE(("leave buf_put_dss_sign"))
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337 }
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338
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339 #endif /* DROPBEAR_DSS */