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annotate rsa.c @ 188:c9483550701b

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- refactored random mp_int generation and byte->mp_int code - added RSA blinding
author Matt Johnston <matt@ucc.asn.au>
date Thu, 05 May 2005 03:58:21 +0000
parents 0cfba3034be5
children 65585699d980
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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(rsa_key * key,
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42 const unsigned char * data, unsigned int len,
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43 mp_int * rsa_em);
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44
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45 /* Load a public rsa key from a buffer, initialising the values.
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46 * The key will have the same format as buf_put_rsa_key.
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47 * These should be freed with rsa_key_free.
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48 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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49 int buf_get_rsa_pub_key(buffer* buf, rsa_key *key) {
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50
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51 TRACE(("enter buf_get_rsa_pub_key"))
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52 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 return DROPBEAR_FAILURE;
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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 return DROPBEAR_FAILURE;
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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 return DROPBEAR_SUCCESS;
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76 }
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78 /* Same as buf_get_rsa_pub_key, but reads a private "x" key at the end.
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79 * Loads a private rsa key from a buffer
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80 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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81 int buf_get_rsa_priv_key(buffer* buf, rsa_key *key) {
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82
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83 assert(key != NULL);
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84
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85 TRACE(("enter buf_get_rsa_priv_key"))
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86
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87 if (buf_get_rsa_pub_key(buf, key) == DROPBEAR_FAILURE) {
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88 TRACE(("leave buf_get_rsa_priv_key: pub: ret == DROPBEAR_FAILURE"))
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89 return DROPBEAR_FAILURE;
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90 }
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91
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92 key->d = m_malloc(sizeof(mp_int));
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93 m_mp_init(key->d);
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94 if (buf_getmpint(buf, key->d) == DROPBEAR_FAILURE) {
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95 TRACE(("leave buf_get_rsa_priv_key: d: ret == DROPBEAR_FAILURE"))
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96 return DROPBEAR_FAILURE;
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97 }
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98
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99 /* old Dropbear private keys didn't keep p and q, so we will ignore them*/
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100 if (buf->pos == buf->len) {
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101 key->p = NULL;
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102 key->q = NULL;
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103 } else {
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104 key->p = m_malloc(sizeof(mp_int));
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105 key->q = m_malloc(sizeof(mp_int));
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106 m_mp_init_multi(key->p, key->q, NULL);
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107
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108 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE) {
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109 TRACE(("leave buf_get_rsa_priv_key: p: ret == DROPBEAR_FAILURE"))
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110 return DROPBEAR_FAILURE;
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111 }
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112
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113 if (buf_getmpint(buf, key->q) == DROPBEAR_FAILURE) {
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114 TRACE(("leave buf_get_rsa_priv_key: q: ret == DROPBEAR_FAILURE"))
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115 return DROPBEAR_FAILURE;
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116 }
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117 }
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118
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119 TRACE(("leave buf_get_rsa_priv_key"))
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120 return DROPBEAR_SUCCESS;
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121 }
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122
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123
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124 /* Clear and free the memory used by a public or private key */
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125 void rsa_key_free(rsa_key *key) {
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126
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127 TRACE(("enter rsa_key_free"))
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128
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129 if (key == NULL) {
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130 TRACE(("leave rsa_key_free: key == NULL"))
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131 return;
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132 }
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133 if (key->d) {
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134 mp_clear(key->d);
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135 m_free(key->d);
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136 }
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137 if (key->e) {
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138 mp_clear(key->e);
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139 m_free(key->e);
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140 }
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141 if (key->n) {
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142 mp_clear(key->n);
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143 m_free(key->n);
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144 }
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145 if (key->p) {
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146 mp_clear(key->p);
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parents:
diff changeset
147 m_free(key->p);
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148 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149 if (key->q) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 mp_clear(key->q);
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parents:
diff changeset
151 m_free(key->q);
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parents:
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152 }
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153 m_free(key);
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
154 TRACE(("leave rsa_key_free"))
4
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155 }
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parents:
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156
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
157 /* Put the public rsa key into the buffer in the required format:
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 *
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 * string "ssh-rsa"
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 * mp_int e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 * mp_int n
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parents:
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162 */
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parents:
diff changeset
163 void buf_put_rsa_pub_key(buffer* buf, rsa_key *key) {
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parents:
diff changeset
164
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
165 TRACE(("enter buf_put_rsa_pub_key"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 assert(key != NULL);
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parents:
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167
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parents:
diff changeset
168 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
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parents:
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169 buf_putmpint(buf, key->e);
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diff changeset
170 buf_putmpint(buf, key->n);
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diff changeset
171
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
172 TRACE(("leave buf_put_rsa_pub_key"))
4
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173
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parents:
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174 }
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175
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parents:
diff changeset
176 /* Same as buf_put_rsa_pub_key, but with the private "x" key appended */
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parents:
diff changeset
177 void buf_put_rsa_priv_key(buffer* buf, rsa_key *key) {
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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_priv_key"))
4
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parents:
diff changeset
180
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parents:
diff changeset
181 assert(key != NULL);
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parents:
diff changeset
182 buf_put_rsa_pub_key(buf, key);
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parents:
diff changeset
183 buf_putmpint(buf, key->d);
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parents:
diff changeset
184
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 /* new versions have p and q, old versions don't */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
186 if (key->p) {
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parents:
diff changeset
187 buf_putmpint(buf, key->p);
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parents:
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188 }
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parents:
diff changeset
189 if (key->q) {
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parents:
diff changeset
190 buf_putmpint(buf, key->q);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192
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parents:
diff changeset
193
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
194 TRACE(("leave buf_put_rsa_priv_key"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195
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parents:
diff changeset
196 }
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parents:
diff changeset
197
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
198 #ifdef DROPBEAR_SIGNKEY_VERIFY
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 /* 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
200 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 int buf_rsa_verify(buffer * buf, rsa_key *key, const unsigned char* data,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202 unsigned int len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
203
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
204 unsigned int slen;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
205 DEF_MP_INT(rsa_s);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
206 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
207 DEF_MP_INT(rsa_em);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 int ret = DROPBEAR_FAILURE;
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parents:
diff changeset
209
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
210 TRACE(("enter buf_rsa_verify"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
211
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 assert(key != NULL);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
214 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
215
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 slen = buf_getint(buf);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 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
218 TRACE(("bad size"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 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
223 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
224 TRACE(("failed reading rsa_s"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 goto out;
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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 that s <= n-1 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 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
230 TRACE(("s > n-1"))
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
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 /* create the magic PKCS padded value */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
235 rsa_pad_em(key, data, len, &rsa_em);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 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
238 TRACE(("failed exptmod rsa_s"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 goto out;
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
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
242 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
243 /* 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
244 TRACE(("success!"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 ret = DROPBEAR_SUCCESS;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 }
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 out:
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
249 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
250 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
251 return ret;
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
252 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 #endif /* DROPBEAR_SIGNKEY_VERIFY */
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 /* 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
257 * to the buffer */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 void buf_put_rsa_sign(buffer* buf, rsa_key *key, const unsigned char* data,
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 unsigned int len) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 unsigned int nsize, ssize;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 unsigned int i;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
263 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
264 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
265 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
266 DEF_MP_INT(rsa_tmp3);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
267 unsigned char *tmpbuf;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268
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
269 TRACE(("enter buf_put_rsa_sign"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 assert(key != NULL);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
271
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
272 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
273
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
274 rsa_pad_em(key, data, len, &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
275
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
276 /* the actual signing of the padded data */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
277
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
278 #define RSA_BLINDING
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
279 #ifdef RSA_BLINDING
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
280
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
281 /* With blinding, s = (r^(-1))((em)*r^e)^d mod n */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
282
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
283 /* generate the r blinding value */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
284 /* rsa_tmp2 is r */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
285 gen_random_mpint(key->n, &rsa_tmp2);
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
286
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
287 /* rsa_tmp1 is em */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
288 /* em' = em * r^e mod n */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
289
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
290 mp_exptmod(&rsa_tmp2, key->e, key->n, &rsa_s); /* rsa_s used as a temp var*/
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
291 mp_invmod(&rsa_tmp2, key->n, &rsa_tmp3);
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292 mp_mulmod(&rsa_tmp1, &rsa_s, key->n, &rsa_tmp2);
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293
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294 /* rsa_tmp2 is em' */
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295 /* s' = (em')^d mod n */
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296 mp_exptmod(&rsa_tmp2, key->d, key->n, &rsa_tmp1);
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297
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298 /* rsa_tmp1 is s' */
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299 /* rsa_tmp3 is r^(-1) mod n */
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300 /* s = (s')r^(-1) mod n */
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301 mp_mulmod(&rsa_tmp1, &rsa_tmp3, key->n, &rsa_s);
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302
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303 #else
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304
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305 /* s = em^d mod n */
188
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306 /* rsa_tmp1 is em */
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307 if (mp_exptmod(&rsa_tmp1, key->d, key->n, &rsa_s) != MP_OKAY) {
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308 dropbear_exit("rsa error");
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309 }
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310
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311 #endif /* RSA_BLINDING */
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312
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313 mp_clear_multi(&rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL);
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314
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315 /* create the signature to return */
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316 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
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317
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318 nsize = mp_unsigned_bin_size(key->n);
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319
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320 /* string rsa_signature_blob length */
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321 buf_putint(buf, nsize);
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322 /* pad out s to same length as n */
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323 ssize = mp_unsigned_bin_size(&rsa_s);
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324 assert(ssize <= nsize);
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325 for (i = 0; i < nsize-ssize; i++) {
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326 buf_putbyte(buf, 0x00);
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327 }
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328
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329 if (mp_to_unsigned_bin(&rsa_s, buf_getwriteptr(buf, ssize)) != MP_OKAY) {
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330 dropbear_exit("rsa error");
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331 }
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332 buf_incrwritepos(buf, ssize);
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333 mp_clear(&rsa_s);
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334
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335 #if defined(DEBUG_RSA) && defined(DEBUG_TRACE)
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336 printhex(buf->data, buf->len);
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337 #endif
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338
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339
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340 TRACE(("leave buf_put_rsa_sign"))
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341 }
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342
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343 /* Creates the message value as expected by PKCS, see rfc2437 etc */
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344 /* format to be padded to is:
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345 * EM = 01 | FF* | 00 | prefix | hash
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346 *
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347 * where FF is repeated enough times to make EM one byte
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348 * shorter than the size of key->n
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349 *
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350 * prefix is the ASN1 designator prefix,
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351 * hex 30 21 30 09 06 05 2B 0E 03 02 1A 05 00 04 14
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352 *
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353 * rsa_em must be a pointer to an initialised mp_int.
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354 */
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355 static void rsa_pad_em(rsa_key * key,
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356 const unsigned char * data, unsigned int len,
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357 mp_int * rsa_em) {
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358
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359 /* ASN1 designator (including the 0x00 preceding) */
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360 const char rsa_asn1_magic[] =
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361 {0x00, 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b,
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362 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14};
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363 #define RSA_ASN1_MAGIC_LEN 16
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364 buffer * rsa_EM = NULL;
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365 hash_state hs;
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366 unsigned int nsize;
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367
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368 assert(key != NULL);
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369 assert(data != NULL);
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370 nsize = mp_unsigned_bin_size(key->n);
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371
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372 rsa_EM = buf_new(nsize-1);
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373 /* type byte */
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374 buf_putbyte(rsa_EM, 0x01);
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375 /* Padding with 0xFF bytes */
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376 while(rsa_EM->pos != rsa_EM->size - RSA_ASN1_MAGIC_LEN - SHA1_HASH_SIZE) {
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377 buf_putbyte(rsa_EM, 0xff);
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378 }
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379 /* Magic ASN1 stuff */
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380 memcpy(buf_getwriteptr(rsa_EM, RSA_ASN1_MAGIC_LEN),
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381 rsa_asn1_magic, RSA_ASN1_MAGIC_LEN);
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382 buf_incrwritepos(rsa_EM, RSA_ASN1_MAGIC_LEN);
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383
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384 /* The hash of the data */
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385 sha1_init(&hs);
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386 sha1_process(&hs, data, len);
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387 sha1_done(&hs, buf_getwriteptr(rsa_EM, SHA1_HASH_SIZE));
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388 buf_incrwritepos(rsa_EM, SHA1_HASH_SIZE);
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389
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390 assert(rsa_EM->pos == rsa_EM->size);
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391
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392 /* Create the mp_int from the encoded bytes */
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393 buf_setpos(rsa_EM, 0);
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394 bytes_to_mp(rsa_em, buf_getptr(rsa_EM, rsa_EM->size),
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395 rsa_EM->size);
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396 buf_free(rsa_EM);
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397 }
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398
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399 #endif /* DROPBEAR_RSA */