Mercurial > dropbear
annotate rsa.c @ 279:1f5ec029dfe8
merge of 4c883eb469d2d251ee8abddbc11ae4005db6da17
and bed6155e95a293c9fce7e889d283b5958f3035dc
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 08 Mar 2006 12:53:11 +0000 |
parents | 3cea9d789cca |
children | 454a34b2dfd1 9a789fc03f40 |
rev | line source |
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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 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 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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75 |
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76 } |
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77 |
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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 dropbear_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 |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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|
127 TRACE(("enter rsa_key_free")) |
4
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128 |
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|
129 if (key == NULL) { |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff
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|
130 TRACE(("leave rsa_key_free: key == NULL")) |
4
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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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147 m_free(key->p); |
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148 } |
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149 if (key->q) { |
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150 mp_clear(key->q); |
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151 m_free(key->q); |
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152 } |
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153 m_free(key); |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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|
154 TRACE(("leave rsa_key_free")) |
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155 } |
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156 |
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157 /* Put the public rsa key into the buffer in the required format: |
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158 * |
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159 * string "ssh-rsa" |
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160 * mp_int e |
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161 * mp_int n |
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162 */ |
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163 void buf_put_rsa_pub_key(buffer* buf, rsa_key *key) { |
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164 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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84
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|
165 TRACE(("enter buf_put_rsa_pub_key")) |
241
c5d3ef11155f
* use own assertions which should get logged properly
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216
diff
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|
166 dropbear_assert(key != NULL); |
4
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167 |
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168 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN); |
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169 buf_putmpint(buf, key->e); |
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|
170 buf_putmpint(buf, key->n); |
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171 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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|
172 TRACE(("leave buf_put_rsa_pub_key")) |
4
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173 |
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|
174 } |
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175 |
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176 /* Same as buf_put_rsa_pub_key, but with the private "x" key appended */ |
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|
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
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|
179 TRACE(("enter buf_put_rsa_priv_key")) |
4
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180 |
241
c5d3ef11155f
* use own assertions which should get logged properly
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216
diff
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|
181 dropbear_assert(key != NULL); |
4
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182 buf_put_rsa_pub_key(buf, key); |
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|
183 buf_putmpint(buf, key->d); |
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184 |
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185 /* new versions have p and q, old versions don't */ |
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|
186 if (key->p) { |
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|
187 buf_putmpint(buf, key->p); |
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|
188 } |
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|
189 if (key->q) { |
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changeset
|
190 buf_putmpint(buf, key->q); |
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changeset
|
191 } |
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|
192 |
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193 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
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84
diff
changeset
|
194 TRACE(("leave buf_put_rsa_priv_key")) |
4
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|
195 |
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|
196 } |
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|
197 |
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changeset
|
198 #ifdef DROPBEAR_SIGNKEY_VERIFY |
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199 /* Verify a signature in buf, made on data by the key given. |
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|
200 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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changeset
|
201 int buf_rsa_verify(buffer * buf, rsa_key *key, const unsigned char* data, |
fe6bca95afa7
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diff
changeset
|
202 unsigned int len) { |
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diff
changeset
|
203 |
fe6bca95afa7
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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
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diff
changeset
|
208 int ret = DROPBEAR_FAILURE; |
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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 |
241
c5d3ef11155f
* use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents:
216
diff
changeset
|
212 dropbear_assert(key != NULL); |
4
fe6bca95afa7
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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
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parents:
diff
changeset
|
215 |
fe6bca95afa7
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parents:
diff
changeset
|
216 slen = buf_getint(buf); |
fe6bca95afa7
Makefile.in contains updated files required
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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
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parents:
diff
changeset
|
219 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
220 } |
fe6bca95afa7
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parents:
diff
changeset
|
221 |
fe6bca95afa7
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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
fe6bca95afa7
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parents:
diff
changeset
|
225 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
226 } |
fe6bca95afa7
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parents:
diff
changeset
|
227 |
fe6bca95afa7
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parents:
diff
changeset
|
228 /* check that s <= n-1 */ |
fe6bca95afa7
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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
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parents:
diff
changeset
|
231 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
232 } |
fe6bca95afa7
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parents:
diff
changeset
|
233 |
fe6bca95afa7
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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
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parents:
diff
changeset
|
236 |
fe6bca95afa7
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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
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parents:
diff
changeset
|
239 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
240 } |
fe6bca95afa7
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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
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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
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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
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parents:
diff
changeset
|
247 |
fe6bca95afa7
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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
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
253 |
fe6bca95afa7
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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 |
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256 /* Sign the data presented with key, writing the signature contents |
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257 * to the buffer */ |
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258 void buf_put_rsa_sign(buffer* buf, rsa_key *key, const unsigned char* data, |
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259 unsigned int len) { |
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260 |
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261 unsigned int nsize, ssize; |
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262 unsigned int i; |
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263 DEF_MP_INT(rsa_s); |
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264 DEF_MP_INT(rsa_tmp1); |
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265 DEF_MP_INT(rsa_tmp2); |
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266 DEF_MP_INT(rsa_tmp3); |
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267 |
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268 TRACE(("enter buf_put_rsa_sign")) |
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269 dropbear_assert(key != NULL); |
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270 |
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271 m_mp_init_multi(&rsa_s, &rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL); |
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272 |
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273 rsa_pad_em(key, data, len, &rsa_tmp1); |
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274 |
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275 /* the actual signing of the padded data */ |
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276 |
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277 #ifdef RSA_BLINDING |
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278 |
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279 /* With blinding, s = (r^(-1))((em)*r^e)^d mod n */ |
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280 |
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281 /* generate the r blinding value */ |
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282 /* rsa_tmp2 is r */ |
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283 gen_random_mpint(key->n, &rsa_tmp2); |
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284 |
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285 /* rsa_tmp1 is em */ |
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286 /* em' = em * r^e mod n */ |
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287 |
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288 mp_exptmod(&rsa_tmp2, key->e, key->n, &rsa_s); /* rsa_s used as a temp var*/ |
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289 mp_invmod(&rsa_tmp2, key->n, &rsa_tmp3); |
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290 mp_mulmod(&rsa_tmp1, &rsa_s, key->n, &rsa_tmp2); |
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291 |
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292 /* rsa_tmp2 is em' */ |
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293 /* s' = (em')^d mod n */ |
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294 mp_exptmod(&rsa_tmp2, key->d, key->n, &rsa_tmp1); |
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295 |
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296 /* rsa_tmp1 is s' */ |
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297 /* rsa_tmp3 is r^(-1) mod n */ |
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298 /* s = (s')r^(-1) mod n */ |
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299 mp_mulmod(&rsa_tmp1, &rsa_tmp3, key->n, &rsa_s); |
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300 |
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301 #else |
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302 |
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303 /* s = em^d mod n */ |
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304 /* rsa_tmp1 is em */ |
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305 if (mp_exptmod(&rsa_tmp1, key->d, key->n, &rsa_s) != MP_OKAY) { |
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306 dropbear_exit("rsa error"); |
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307 } |
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308 |
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309 #endif /* RSA_BLINDING */ |
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310 |
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311 mp_clear_multi(&rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL); |
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312 |
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313 /* create the signature to return */ |
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314 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN); |
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315 |
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316 nsize = mp_unsigned_bin_size(key->n); |
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317 |
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318 /* string rsa_signature_blob length */ |
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319 buf_putint(buf, nsize); |
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320 /* pad out s to same length as n */ |
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321 ssize = mp_unsigned_bin_size(&rsa_s); |
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322 dropbear_assert(ssize <= nsize); |
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323 for (i = 0; i < nsize-ssize; i++) { |
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324 buf_putbyte(buf, 0x00); |
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325 } |
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326 |
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327 if (mp_to_unsigned_bin(&rsa_s, buf_getwriteptr(buf, ssize)) != MP_OKAY) { |
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328 dropbear_exit("rsa error"); |
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329 } |
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330 buf_incrwritepos(buf, ssize); |
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331 mp_clear(&rsa_s); |
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332 |
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333 #if defined(DEBUG_RSA) && defined(DEBUG_TRACE) |
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334 printhex("RSA sig", buf->data, buf->len); |
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335 #endif |
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336 |
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337 |
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338 TRACE(("leave buf_put_rsa_sign")) |
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339 } |
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340 |
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341 /* Creates the message value as expected by PKCS, see rfc2437 etc */ |
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342 /* format to be padded to is: |
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343 * EM = 01 | FF* | 00 | prefix | hash |
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344 * |
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345 * where FF is repeated enough times to make EM one byte |
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346 * shorter than the size of key->n |
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347 * |
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348 * prefix is the ASN1 designator prefix, |
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349 * hex 30 21 30 09 06 05 2B 0E 03 02 1A 05 00 04 14 |
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350 * |
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351 * rsa_em must be a pointer to an initialised mp_int. |
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352 */ |
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353 static void rsa_pad_em(rsa_key * key, |
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354 const unsigned char * data, unsigned int len, |
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355 mp_int * rsa_em) { |
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356 |
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357 /* ASN1 designator (including the 0x00 preceding) */ |
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358 const unsigned char rsa_asn1_magic[] = |
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359 {0x00, 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, |
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360 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14}; |
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361 const unsigned int RSA_ASN1_MAGIC_LEN = 16; |
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362 |
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363 buffer * rsa_EM = NULL; |
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364 hash_state hs; |
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365 unsigned int nsize; |
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366 |
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367 dropbear_assert(key != NULL); |
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368 dropbear_assert(data != NULL); |
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369 nsize = mp_unsigned_bin_size(key->n); |
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370 |
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371 rsa_EM = buf_new(nsize-1); |
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372 /* type byte */ |
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373 buf_putbyte(rsa_EM, 0x01); |
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374 /* Padding with 0xFF bytes */ |
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375 while(rsa_EM->pos != rsa_EM->size - RSA_ASN1_MAGIC_LEN - SHA1_HASH_SIZE) { |
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376 buf_putbyte(rsa_EM, 0xff); |
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377 } |
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378 /* Magic ASN1 stuff */ |
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379 memcpy(buf_getwriteptr(rsa_EM, RSA_ASN1_MAGIC_LEN), |
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380 rsa_asn1_magic, RSA_ASN1_MAGIC_LEN); |
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381 buf_incrwritepos(rsa_EM, RSA_ASN1_MAGIC_LEN); |
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382 |
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383 /* The hash of the data */ |
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384 sha1_init(&hs); |
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385 sha1_process(&hs, data, len); |
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386 sha1_done(&hs, buf_getwriteptr(rsa_EM, SHA1_HASH_SIZE)); |
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387 buf_incrwritepos(rsa_EM, SHA1_HASH_SIZE); |
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388 |
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389 dropbear_assert(rsa_EM->pos == rsa_EM->size); |
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390 |
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391 /* Create the mp_int from the encoded bytes */ |
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392 buf_setpos(rsa_EM, 0); |
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393 bytes_to_mp(rsa_em, buf_getptr(rsa_EM, rsa_EM->size), |
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394 rsa_EM->size); |
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395 buf_free(rsa_EM); |
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396 } |
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397 |
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398 #endif /* DROPBEAR_RSA */ |