annotate rsa.c @ 766:d1575fdc29a6 ecc

start on ecdsa keys
author Matt Johnston <matt@ucc.asn.au>
date Tue, 09 Apr 2013 00:36:04 +0800
parents f336d232fc63
children 7dcb46da72d9
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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 /* Perform RSA operations on data, including reading keys, signing and
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26 * verification.
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27 *
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28 * The format is specified in rfc2437, Applied Cryptography or The Handbook of
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29 * Applied Cryptography detail the general algorithm. */
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30
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31 #include "includes.h"
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32 #include "dbutil.h"
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33 #include "bignum.h"
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34 #include "rsa.h"
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35 #include "buffer.h"
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36 #include "ssh.h"
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37 #include "random.h"
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38
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39 #ifdef DROPBEAR_RSA
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40
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41 static void rsa_pad_em(dropbear_rsa_key * key,
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42 buffer *data_buf, mp_int * rsa_em);
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43
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44 /* Load a public rsa key from a buffer, initialising the values.
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45 * The key will have the same format as buf_put_rsa_key.
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46 * These should be freed with rsa_key_free.
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47 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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48 int buf_get_rsa_pub_key(buffer* buf, dropbear_rsa_key *key) {
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49
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50 int ret = DROPBEAR_FAILURE;
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51 TRACE(("enter buf_get_rsa_pub_key"))
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52 dropbear_assert(key != NULL);
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53 key->e = m_malloc(sizeof(mp_int));
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54 key->n = m_malloc(sizeof(mp_int));
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55 m_mp_init_multi(key->e, key->n, NULL);
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56 key->d = NULL;
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57 key->p = NULL;
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58 key->q = NULL;
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59
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60 buf_incrpos(buf, 4+SSH_SIGNKEY_RSA_LEN); /* int + "ssh-rsa" */
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61
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62 if (buf_getmpint(buf, key->e) == DROPBEAR_FAILURE
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63 || buf_getmpint(buf, key->n) == DROPBEAR_FAILURE) {
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64 TRACE(("leave buf_get_rsa_pub_key: failure"))
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65 goto out;
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66 }
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67
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68 if (mp_count_bits(key->n) < MIN_RSA_KEYLEN) {
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69 dropbear_log(LOG_WARNING, "RSA key too short");
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70 goto out;
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71 }
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72
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73 TRACE(("leave buf_get_rsa_pub_key: success"))
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74 ret = DROPBEAR_SUCCESS;
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75 out:
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76 if (ret == DROPBEAR_FAILURE) {
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77 m_free(key->e);
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78 m_free(key->n);
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79 }
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80 return ret;
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81 }
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82
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83 /* Same as buf_get_rsa_pub_key, but reads private bits at the end.
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84 * Loads a private rsa key from a buffer
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85 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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86 int buf_get_rsa_priv_key(buffer* buf, dropbear_rsa_key *key) {
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87 int ret = DROPBEAR_FAILURE;
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88
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89 TRACE(("enter buf_get_rsa_priv_key"))
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90 dropbear_assert(key != NULL);
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91
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92 if (buf_get_rsa_pub_key(buf, key) == DROPBEAR_FAILURE) {
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93 TRACE(("leave buf_get_rsa_priv_key: pub: ret == DROPBEAR_FAILURE"))
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94 return DROPBEAR_FAILURE;
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95 }
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96
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97 key->d = NULL;
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98 key->p = NULL;
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99 key->q = NULL;
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100
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101 key->d = m_malloc(sizeof(mp_int));
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102 m_mp_init(key->d);
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103 if (buf_getmpint(buf, key->d) == DROPBEAR_FAILURE) {
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104 TRACE(("leave buf_get_rsa_priv_key: d: ret == DROPBEAR_FAILURE"))
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105 goto out;
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106 }
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107
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108 if (buf->pos == buf->len) {
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109 /* old Dropbear private keys didn't keep p and q, so we will ignore them*/
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110 } else {
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111 key->p = m_malloc(sizeof(mp_int));
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112 key->q = m_malloc(sizeof(mp_int));
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113 m_mp_init_multi(key->p, key->q, NULL);
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114
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115 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE) {
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116 TRACE(("leave buf_get_rsa_priv_key: p: ret == DROPBEAR_FAILURE"))
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117 goto out;
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118 }
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119
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120 if (buf_getmpint(buf, key->q) == DROPBEAR_FAILURE) {
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121 TRACE(("leave buf_get_rsa_priv_key: q: ret == DROPBEAR_FAILURE"))
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122 goto out;
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123 }
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124 }
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125
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126 ret = DROPBEAR_SUCCESS;
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127 out:
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128 if (ret == DROPBEAR_FAILURE) {
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129 m_free(key->d);
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130 m_free(key->p);
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131 m_free(key->q);
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132 }
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133 TRACE(("leave buf_get_rsa_priv_key"))
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134 return ret;
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135 }
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136
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137
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138 /* Clear and free the memory used by a public or private key */
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parents: 378
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139 void rsa_key_free(dropbear_rsa_key *key) {
4
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diff changeset
140
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
141 TRACE(("enter rsa_key_free"))
4
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142
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parents:
diff changeset
143 if (key == NULL) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
144 TRACE(("leave rsa_key_free: key == NULL"))
4
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diff changeset
145 return;
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parents:
diff changeset
146 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147 if (key->d) {
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diff changeset
148 mp_clear(key->d);
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diff changeset
149 m_free(key->d);
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150 }
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parents:
diff changeset
151 if (key->e) {
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152 mp_clear(key->e);
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153 m_free(key->e);
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154 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 if (key->n) {
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diff changeset
156 mp_clear(key->n);
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diff changeset
157 m_free(key->n);
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158 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 if (key->p) {
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parents:
diff changeset
160 mp_clear(key->p);
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diff changeset
161 m_free(key->p);
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162 }
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163 if (key->q) {
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164 mp_clear(key->q);
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165 m_free(key->q);
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166 }
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167 m_free(key);
165
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parents: 84
diff changeset
168 TRACE(("leave rsa_key_free"))
4
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169 }
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170
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171 /* Put the public rsa key into the buffer in the required format:
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172 *
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173 * string "ssh-rsa"
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174 * mp_int e
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175 * mp_int n
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176 */
586
b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so
Matt Johnston <matt@ucc.asn.au>
parents: 378
diff changeset
177 void buf_put_rsa_pub_key(buffer* buf, dropbear_rsa_key *key) {
4
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178
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
179 TRACE(("enter buf_put_rsa_pub_key"))
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
180 dropbear_assert(key != NULL);
4
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181
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diff changeset
182 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
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183 buf_putmpint(buf, key->e);
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184 buf_putmpint(buf, key->n);
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diff changeset
185
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 84
diff changeset
186 TRACE(("leave buf_put_rsa_pub_key"))
4
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187
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parents:
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188 }
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diff changeset
189
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diff changeset
190 /* Same as buf_put_rsa_pub_key, but with the private "x" key appended */
586
b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so
Matt Johnston <matt@ucc.asn.au>
parents: 378
diff changeset
191 void buf_put_rsa_priv_key(buffer* buf, dropbear_rsa_key *key) {
4
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diff changeset
192
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
193 TRACE(("enter buf_put_rsa_priv_key"))
4
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diff changeset
194
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
195 dropbear_assert(key != NULL);
4
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diff changeset
196 buf_put_rsa_pub_key(buf, key);
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parents:
diff changeset
197 buf_putmpint(buf, key->d);
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parents:
diff changeset
198
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parents:
diff changeset
199 /* new versions have p and q, old versions don't */
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parents:
diff changeset
200 if (key->p) {
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parents:
diff changeset
201 buf_putmpint(buf, key->p);
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parents:
diff changeset
202 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203 if (key->q) {
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parents:
diff changeset
204 buf_putmpint(buf, key->q);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
208 TRACE(("leave buf_put_rsa_priv_key"))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
209
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 }
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 #ifdef DROPBEAR_SIGNKEY_VERIFY
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parents:
diff changeset
213 /* Verify a signature in buf, made on data by the key given.
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 * 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: 594
diff changeset
215 int buf_rsa_verify(buffer * buf, dropbear_rsa_key *key, buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
216 unsigned int slen;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
217 DEF_MP_INT(rsa_s);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
218 DEF_MP_INT(rsa_mdash);
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
219 DEF_MP_INT(rsa_em);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 int ret = DROPBEAR_FAILURE;
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parents:
diff changeset
221
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
222 TRACE(("enter buf_rsa_verify"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
223
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
224 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
225
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
226 m_mp_init_multi(&rsa_mdash, &rsa_s, &rsa_em, NULL);
4
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 slen = buf_getint(buf);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 if (slen != (unsigned int)mp_unsigned_bin_size(key->n)) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
230 TRACE(("bad size"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 goto out;
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 if (mp_read_unsigned_bin(&rsa_s, buf_getptr(buf, buf->len - buf->pos),
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 buf->len - buf->pos) != MP_OKAY) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
236 TRACE(("failed reading rsa_s"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 }
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 /* check that s <= n-1 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 if (mp_cmp(&rsa_s, key->n) != 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: 84
diff changeset
242 TRACE(("s > n-1"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 /* create the magic PKCS padded value */
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
247 rsa_pad_em(key, data_buf, &rsa_em);
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
248
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 if (mp_exptmod(&rsa_s, key->e, key->n, &rsa_mdash) != MP_OKAY) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
250 TRACE(("failed exptmod rsa_s"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 goto out;
fe6bca95afa7 Makefile.in contains updated files required
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
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
254 if (mp_cmp(&rsa_em, &rsa_mdash) == MP_EQ) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 /* signature is valid */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
256 TRACE(("success!"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 ret = DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 }
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 out:
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
261 mp_clear_multi(&rsa_mdash, &rsa_s, &rsa_em, NULL);
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
262 TRACE(("leave buf_rsa_verify: ret %d", ret))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 return ret;
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
264 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 #endif /* DROPBEAR_SIGNKEY_VERIFY */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 /* 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
269 * 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: 594
diff changeset
270 void buf_put_rsa_sign(buffer* buf, dropbear_rsa_key *key, buffer *data_buf) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271 unsigned int nsize, ssize;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272 unsigned int i;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
273 DEF_MP_INT(rsa_s);
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
274 DEF_MP_INT(rsa_tmp1);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
275 DEF_MP_INT(rsa_tmp2);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
276 DEF_MP_INT(rsa_tmp3);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
277
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
278 TRACE(("enter buf_put_rsa_sign"))
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
279 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
281 m_mp_init_multi(&rsa_s, &rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
282
760
f336d232fc63 Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
283 rsa_pad_em(key, data_buf, &rsa_tmp1);
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
284
4
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285 /* the actual signing of the padded data */
188
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286
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287 #ifdef RSA_BLINDING
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288
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289 /* With blinding, s = (r^(-1))((em)*r^e)^d mod n */
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290
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291 /* generate the r blinding value */
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292 /* rsa_tmp2 is r */
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293 gen_random_mpint(key->n, &rsa_tmp2);
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294
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295 /* rsa_tmp1 is em */
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296 /* em' = em * r^e mod n */
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297
340
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298 /* rsa_s used as a temp var*/
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299 if (mp_exptmod(&rsa_tmp2, key->e, key->n, &rsa_s) != MP_OKAY) {
594
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300 dropbear_exit("RSA error");
340
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301 }
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302 if (mp_invmod(&rsa_tmp2, key->n, &rsa_tmp3) != MP_OKAY) {
594
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303 dropbear_exit("RSA error");
340
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304 }
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305 if (mp_mulmod(&rsa_tmp1, &rsa_s, key->n, &rsa_tmp2) != MP_OKAY) {
594
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306 dropbear_exit("RSA error");
340
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307 }
188
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308
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309 /* rsa_tmp2 is em' */
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310 /* s' = (em')^d mod n */
340
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311 if (mp_exptmod(&rsa_tmp2, key->d, key->n, &rsa_tmp1) != MP_OKAY) {
594
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312 dropbear_exit("RSA error");
340
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313 }
188
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314
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315 /* rsa_tmp1 is s' */
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316 /* rsa_tmp3 is r^(-1) mod n */
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317 /* s = (s')r^(-1) mod n */
340
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318 if (mp_mulmod(&rsa_tmp1, &rsa_tmp3, key->n, &rsa_s) != MP_OKAY) {
594
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319 dropbear_exit("RSA error");
340
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320 }
188
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321
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322 #else
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323
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324 /* s = em^d mod n */
188
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325 /* rsa_tmp1 is em */
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326 if (mp_exptmod(&rsa_tmp1, key->d, key->n, &rsa_s) != MP_OKAY) {
594
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327 dropbear_exit("RSA error");
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328 }
188
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329
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330 #endif /* RSA_BLINDING */
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331
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332 mp_clear_multi(&rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL);
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333
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334 /* create the signature to return */
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335 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
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336
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337 nsize = mp_unsigned_bin_size(key->n);
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338
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339 /* string rsa_signature_blob length */
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340 buf_putint(buf, nsize);
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341 /* pad out s to same length as n */
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342 ssize = mp_unsigned_bin_size(&rsa_s);
241
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343 dropbear_assert(ssize <= nsize);
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344 for (i = 0; i < nsize-ssize; i++) {
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345 buf_putbyte(buf, 0x00);
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346 }
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347
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348 if (mp_to_unsigned_bin(&rsa_s, buf_getwriteptr(buf, ssize)) != MP_OKAY) {
594
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349 dropbear_exit("RSA error");
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350 }
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351 buf_incrwritepos(buf, ssize);
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352 mp_clear(&rsa_s);
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353
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354 #if defined(DEBUG_RSA) && defined(DEBUG_TRACE)
198
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355 printhex("RSA sig", buf->data, buf->len);
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356 #endif
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357
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358
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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359 TRACE(("leave buf_put_rsa_sign"))
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360 }
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361
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362 /* Creates the message value as expected by PKCS, see rfc2437 etc */
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363 /* format to be padded to is:
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364 * EM = 01 | FF* | 00 | prefix | hash
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365 *
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366 * where FF is repeated enough times to make EM one byte
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367 * shorter than the size of key->n
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368 *
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369 * prefix is the ASN1 designator prefix,
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370 * hex 30 21 30 09 06 05 2B 0E 03 02 1A 05 00 04 14
188
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371 *
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372 * rsa_em must be a pointer to an initialised mp_int.
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373 */
586
b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so
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diff changeset
374 static void rsa_pad_em(dropbear_rsa_key * key,
760
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diff changeset
375 buffer *data_buf, mp_int * rsa_em) {
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376
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377 /* ASN1 designator (including the 0x00 preceding) */
198
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diff changeset
378 const unsigned char rsa_asn1_magic[] =
4
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379 {0x00, 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b,
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380 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14};
198
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diff changeset
381 const unsigned int RSA_ASN1_MAGIC_LEN = 16;
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382
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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diff changeset
383 buffer * rsa_EM = NULL;
4
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384 hash_state hs;
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385 unsigned int nsize;
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386
241
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diff changeset
387 dropbear_assert(key != NULL);
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388 nsize = mp_unsigned_bin_size(key->n);
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389
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390 rsa_EM = buf_new(nsize-1);
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391 /* type byte */
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392 buf_putbyte(rsa_EM, 0x01);
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393 /* Padding with 0xFF bytes */
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394 while(rsa_EM->pos != rsa_EM->size - RSA_ASN1_MAGIC_LEN - SHA1_HASH_SIZE) {
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395 buf_putbyte(rsa_EM, 0xff);
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396 }
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397 /* Magic ASN1 stuff */
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398 memcpy(buf_getwriteptr(rsa_EM, RSA_ASN1_MAGIC_LEN),
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399 rsa_asn1_magic, RSA_ASN1_MAGIC_LEN);
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400 buf_incrwritepos(rsa_EM, RSA_ASN1_MAGIC_LEN);
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401
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402 /* The hash of the data */
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403 sha1_init(&hs);
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diff changeset
404 sha1_process(&hs, data_buf->data, data_buf->len);
4
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405 sha1_done(&hs, buf_getwriteptr(rsa_EM, SHA1_HASH_SIZE));
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406 buf_incrwritepos(rsa_EM, SHA1_HASH_SIZE);
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diff changeset
407
241
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diff changeset
408 dropbear_assert(rsa_EM->pos == rsa_EM->size);
4
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409
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410 /* Create the mp_int from the encoded bytes */
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diff changeset
411 buf_setpos(rsa_EM, 0);
188
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diff changeset
412 bytes_to_mp(rsa_em, buf_getptr(rsa_EM, rsa_EM->size),
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diff changeset
413 rsa_EM->size);
4
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414 buf_free(rsa_EM);
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415 }
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416
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417 #endif /* DROPBEAR_RSA */