annotate rsa.c @ 1123:d7b752525b91

buf_getstring and buf_putstring now use non-unsigned char*
author Matt Johnston <matt@ucc.asn.au>
date Thu, 04 Jun 2015 23:08:50 +0800
parents c45d65392c1a
children c6346c63281b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "dbrandom.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 m_mp_alloc_init_multi(&key->e, &key->n, NULL);
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54 key->d = NULL;
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55 key->p = NULL;
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56 key->q = NULL;
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57
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58 buf_incrpos(buf, 4+SSH_SIGNKEY_RSA_LEN); /* int + "ssh-rsa" */
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59
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60 if (buf_getmpint(buf, key->e) == DROPBEAR_FAILURE
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61 || buf_getmpint(buf, key->n) == DROPBEAR_FAILURE) {
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62 TRACE(("leave buf_get_rsa_pub_key: failure"))
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63 goto out;
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64 }
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65
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66 if (mp_count_bits(key->n) < MIN_RSA_KEYLEN) {
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67 dropbear_log(LOG_WARNING, "RSA key too short");
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68 goto out;
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69 }
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70
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71 TRACE(("leave buf_get_rsa_pub_key: success"))
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72 ret = DROPBEAR_SUCCESS;
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73 out:
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74 if (ret == DROPBEAR_FAILURE) {
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75 m_free(key->e);
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76 m_free(key->n);
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77 }
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78 return ret;
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79 }
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80
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81 /* Same as buf_get_rsa_pub_key, but reads private bits at the end.
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82 * Loads a private rsa key from a buffer
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83 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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84 int buf_get_rsa_priv_key(buffer* buf, dropbear_rsa_key *key) {
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85 int ret = DROPBEAR_FAILURE;
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86
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87 TRACE(("enter buf_get_rsa_priv_key"))
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88 dropbear_assert(key != NULL);
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89
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90 if (buf_get_rsa_pub_key(buf, key) == DROPBEAR_FAILURE) {
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91 TRACE(("leave buf_get_rsa_priv_key: pub: ret == DROPBEAR_FAILURE"))
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92 return DROPBEAR_FAILURE;
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93 }
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94
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95 key->d = NULL;
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96 key->p = NULL;
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97 key->q = NULL;
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98
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99 m_mp_alloc_init_multi(&key->d, NULL);
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100 if (buf_getmpint(buf, key->d) == DROPBEAR_FAILURE) {
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101 TRACE(("leave buf_get_rsa_priv_key: d: ret == DROPBEAR_FAILURE"))
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102 goto out;
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103 }
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104
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105 if (buf->pos == buf->len) {
370
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106 /* old Dropbear private keys didn't keep p and q, so we will ignore them*/
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107 } else {
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108 m_mp_alloc_init_multi(&key->p, &key->q, NULL);
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109
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110 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE) {
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111 TRACE(("leave buf_get_rsa_priv_key: p: ret == DROPBEAR_FAILURE"))
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112 goto out;
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113 }
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114
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115 if (buf_getmpint(buf, key->q) == DROPBEAR_FAILURE) {
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116 TRACE(("leave buf_get_rsa_priv_key: q: 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
370
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121 ret = DROPBEAR_SUCCESS;
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122 out:
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123 if (ret == DROPBEAR_FAILURE) {
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124 m_free(key->d);
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125 m_free(key->p);
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126 m_free(key->q);
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127 }
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128 TRACE(("leave buf_get_rsa_priv_key"))
370
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129 return ret;
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130 }
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131
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132
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133 /* Clear and free the memory used by a public or private key */
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134 void rsa_key_free(dropbear_rsa_key *key) {
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135
731
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136 TRACE2(("enter rsa_key_free"))
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137
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diff changeset
138 if (key == NULL) {
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
139 TRACE2(("leave rsa_key_free: key == NULL"))
4
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parents:
diff changeset
140 return;
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parents:
diff changeset
141 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 if (key->d) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 mp_clear(key->d);
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parents:
diff changeset
144 m_free(key->d);
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parents:
diff changeset
145 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 if (key->e) {
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parents:
diff changeset
147 mp_clear(key->e);
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parents:
diff changeset
148 m_free(key->e);
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parents:
diff changeset
149 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
150 if (key->n) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
151 mp_clear(key->n);
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parents:
diff changeset
152 m_free(key->n);
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parents:
diff changeset
153 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
154 if (key->p) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
155 mp_clear(key->p);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 m_free(key->p);
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parents:
diff changeset
157 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
158 if (key->q) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
159 mp_clear(key->q);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 m_free(key->q);
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parents:
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161 }
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diff changeset
162 m_free(key);
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
163 TRACE2(("leave rsa_key_free"))
4
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parents:
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164 }
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165
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
166 /* Put the public rsa key into the buffer in the required format:
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Matt Johnston <matt@ucc.asn.au>
parents:
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167 *
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parents:
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168 * string "ssh-rsa"
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parents:
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169 * mp_int e
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parents:
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170 * mp_int n
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parents:
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171 */
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
172 void buf_put_rsa_pub_key(buffer* buf, dropbear_rsa_key *key) {
4
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173
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 84
diff changeset
174 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
175 dropbear_assert(key != NULL);
4
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parents:
diff changeset
176
1123
d7b752525b91 buf_getstring and buf_putstring now use non-unsigned char*
Matt Johnston <matt@ucc.asn.au>
parents: 1094
diff changeset
177 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
4
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parents:
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178 buf_putmpint(buf, key->e);
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parents:
diff changeset
179 buf_putmpint(buf, key->n);
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diff changeset
180
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
181 TRACE(("leave buf_put_rsa_pub_key"))
4
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parents:
diff changeset
182
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
183 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
184
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
185 /* 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
186 void buf_put_rsa_priv_key(buffer* buf, dropbear_rsa_key *key) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
187
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
188 TRACE(("enter buf_put_rsa_priv_key"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
190 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 buf_put_rsa_pub_key(buf, key);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
192 buf_putmpint(buf, key->d);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194 /* new versions have p and q, old versions don't */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
195 if (key->p) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 buf_putmpint(buf, key->p);
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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 if (key->q) {
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
199 buf_putmpint(buf, key->q);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
200 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
202
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
203 TRACE(("leave buf_put_rsa_priv_key"))
4
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 }
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 #ifdef DROPBEAR_SIGNKEY_VERIFY
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 /* Verify a 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
209 * 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
210 int buf_rsa_verify(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
211 unsigned int slen;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
212 DEF_MP_INT(rsa_s);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
213 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
214 DEF_MP_INT(rsa_em);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 int ret = DROPBEAR_FAILURE;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216
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
217 TRACE(("enter buf_rsa_verify"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
218
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
219 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
221 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
222
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 slen = buf_getint(buf);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 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
225 TRACE(("bad size"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 goto out;
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 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
230 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
231 TRACE(("failed reading rsa_s"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 /* check that s <= n-1 */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 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
237 TRACE(("s > n-1"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 goto out;
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 /* 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
242 rsa_pad_em(key, data_buf, &rsa_em);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 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
245 TRACE(("failed exptmod rsa_s"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 goto out;
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
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
249 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
250 /* 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
251 TRACE(("success!"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 ret = DROPBEAR_SUCCESS;
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 out:
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
256 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
257 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
258 return ret;
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
259 }
4
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 #endif /* DROPBEAR_SIGNKEY_VERIFY */
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 /* 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
264 * 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
265 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
266 unsigned int nsize, ssize;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 unsigned int i;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
268 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
269 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
270 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
271 DEF_MP_INT(rsa_tmp3);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
272
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
273 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
274 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
275
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
276 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
277
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
278 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
279
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
280 /* 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
281
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
282 #ifdef RSA_BLINDING
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
283
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284 /* With blinding, s = (r^(-1))((em)*r^e)^d mod n */
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285
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286 /* generate the r blinding value */
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287 /* rsa_tmp2 is r */
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288 gen_random_mpint(key->n, &rsa_tmp2);
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289
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290 /* rsa_tmp1 is em */
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291 /* em' = em * r^e mod n */
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292
340
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293 /* rsa_s used as a temp var*/
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294 if (mp_exptmod(&rsa_tmp2, key->e, key->n, &rsa_s) != MP_OKAY) {
594
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295 dropbear_exit("RSA error");
340
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296 }
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297 if (mp_invmod(&rsa_tmp2, key->n, &rsa_tmp3) != MP_OKAY) {
594
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298 dropbear_exit("RSA error");
340
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299 }
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300 if (mp_mulmod(&rsa_tmp1, &rsa_s, key->n, &rsa_tmp2) != MP_OKAY) {
594
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301 dropbear_exit("RSA error");
340
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302 }
188
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303
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304 /* rsa_tmp2 is em' */
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305 /* s' = (em')^d mod n */
340
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306 if (mp_exptmod(&rsa_tmp2, key->d, key->n, &rsa_tmp1) != MP_OKAY) {
594
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307 dropbear_exit("RSA error");
340
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308 }
188
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309
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310 /* rsa_tmp1 is s' */
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311 /* rsa_tmp3 is r^(-1) mod n */
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312 /* s = (s')r^(-1) mod n */
340
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313 if (mp_mulmod(&rsa_tmp1, &rsa_tmp3, key->n, &rsa_s) != MP_OKAY) {
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314 dropbear_exit("RSA error");
340
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315 }
188
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316
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317 #else
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318
4
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319 /* s = em^d mod n */
188
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320 /* rsa_tmp1 is em */
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321 if (mp_exptmod(&rsa_tmp1, key->d, key->n, &rsa_s) != MP_OKAY) {
594
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322 dropbear_exit("RSA error");
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323 }
188
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324
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325 #endif /* RSA_BLINDING */
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326
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327 mp_clear_multi(&rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL);
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328
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329 /* create the signature to return */
1123
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330 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
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331
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332 nsize = mp_unsigned_bin_size(key->n);
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333
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334 /* string rsa_signature_blob length */
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335 buf_putint(buf, nsize);
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336 /* pad out s to same length as n */
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337 ssize = mp_unsigned_bin_size(&rsa_s);
241
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338 dropbear_assert(ssize <= nsize);
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339 for (i = 0; i < nsize-ssize; i++) {
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340 buf_putbyte(buf, 0x00);
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341 }
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342
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343 if (mp_to_unsigned_bin(&rsa_s, buf_getwriteptr(buf, ssize)) != MP_OKAY) {
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344 dropbear_exit("RSA error");
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345 }
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346 buf_incrwritepos(buf, ssize);
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347 mp_clear(&rsa_s);
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348
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349 #if defined(DEBUG_RSA) && defined(DEBUG_TRACE)
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350 if (!debug_trace) {
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351 printhex("RSA sig", buf->data, buf->len);
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352 }
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353 #endif
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354
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355
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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356 TRACE(("leave buf_put_rsa_sign"))
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357 }
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358
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359 /* Creates the message value as expected by PKCS, see rfc2437 etc */
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360 /* format to be padded to is:
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361 * EM = 01 | FF* | 00 | prefix | hash
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362 *
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363 * where FF is repeated enough times to make EM one byte
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364 * shorter than the size of key->n
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365 *
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366 * prefix is the ASN1 designator prefix,
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367 * hex 30 21 30 09 06 05 2B 0E 03 02 1A 05 00 04 14
188
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368 *
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369 * rsa_em must be a pointer to an initialised mp_int.
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370 */
586
b50f0107e505 Rename rsa_key to dropbear_rsa_key (and same for dss too) so
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371 static void rsa_pad_em(dropbear_rsa_key * key,
760
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diff changeset
372 buffer *data_buf, mp_int * rsa_em) {
4
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373
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374 /* ASN1 designator (including the 0x00 preceding) */
198
65585699d980 * add a "label" argument to printhex()
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375 const unsigned char rsa_asn1_magic[] =
4
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376 {0x00, 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b,
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377 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14};
198
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diff changeset
378 const unsigned int RSA_ASN1_MAGIC_LEN = 16;
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379
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
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diff changeset
380 buffer * rsa_EM = NULL;
4
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381 hash_state hs;
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382 unsigned int nsize;
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383
241
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diff changeset
384 dropbear_assert(key != NULL);
4
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385 nsize = mp_unsigned_bin_size(key->n);
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386
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387 rsa_EM = buf_new(nsize-1);
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388 /* type byte */
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389 buf_putbyte(rsa_EM, 0x01);
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390 /* Padding with 0xFF bytes */
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391 while(rsa_EM->pos != rsa_EM->size - RSA_ASN1_MAGIC_LEN - SHA1_HASH_SIZE) {
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392 buf_putbyte(rsa_EM, 0xff);
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393 }
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394 /* Magic ASN1 stuff */
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395 memcpy(buf_getwriteptr(rsa_EM, RSA_ASN1_MAGIC_LEN),
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396 rsa_asn1_magic, RSA_ASN1_MAGIC_LEN);
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397 buf_incrwritepos(rsa_EM, RSA_ASN1_MAGIC_LEN);
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398
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399 /* The hash of the data */
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400 sha1_init(&hs);
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diff changeset
401 sha1_process(&hs, data_buf->data, data_buf->len);
4
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402 sha1_done(&hs, buf_getwriteptr(rsa_EM, SHA1_HASH_SIZE));
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403 buf_incrwritepos(rsa_EM, SHA1_HASH_SIZE);
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404
241
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diff changeset
405 dropbear_assert(rsa_EM->pos == rsa_EM->size);
4
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406
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407 /* Create the mp_int from the encoded bytes */
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408 buf_setpos(rsa_EM, 0);
188
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diff changeset
409 bytes_to_mp(rsa_em, buf_getptr(rsa_EM, rsa_EM->size),
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diff changeset
410 rsa_EM->size);
4
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411 buf_free(rsa_EM);
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412 }
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413
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414 #endif /* DROPBEAR_RSA */