annotate rsa.c @ 1692:1051e4eea25a

Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
parents ae41624c2198
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4
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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 #include "signkey.h"
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39
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40 #if DROPBEAR_RSA
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41
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42 #if !(DROPBEAR_RSA_SHA1 || DROPBEAR_RSA_SHA256)
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43 #error Somehow RSA was enabled with neither DROPBEAR_RSA_SHA1 nor DROPBEAR_RSA_SHA256
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44 #endif
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45
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46 static void rsa_pad_em(const dropbear_rsa_key * key,
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47 const buffer *data_buf, mp_int * rsa_em, enum signature_type sigtype);
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48
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49 /* Load a public rsa key from a buffer, initialising the values.
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50 * The key will have the same format as buf_put_rsa_key.
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51 * These should be freed with rsa_key_free.
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52 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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53 int buf_get_rsa_pub_key(buffer* buf, dropbear_rsa_key *key) {
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54
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55 int ret = DROPBEAR_FAILURE;
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56 TRACE(("enter buf_get_rsa_pub_key"))
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57 dropbear_assert(key != NULL);
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58 m_mp_alloc_init_multi(&key->e, &key->n, NULL);
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59 key->d = NULL;
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60 key->p = NULL;
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61 key->q = NULL;
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62
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63 buf_incrpos(buf, 4+SSH_SIGNKEY_RSA_LEN); /* int + "ssh-rsa" */
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64
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65 if (buf_getmpint(buf, key->e) == DROPBEAR_FAILURE
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66 || buf_getmpint(buf, key->n) == DROPBEAR_FAILURE) {
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67 TRACE(("leave buf_get_rsa_pub_key: failure"))
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68 goto out;
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69 }
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71 if (mp_count_bits(key->n) < MIN_RSA_KEYLEN) {
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72 dropbear_log(LOG_WARNING, "RSA key too short");
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73 goto out;
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74 }
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75
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76 /* 64 bit is limit used by openssl, so we won't block any keys in the wild */
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77 if (mp_count_bits(key->e) > 64) {
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78 dropbear_log(LOG_WARNING, "RSA key bad e");
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79 goto out;
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80 }
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81
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82 TRACE(("leave buf_get_rsa_pub_key: success"))
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83 ret = DROPBEAR_SUCCESS;
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84 out:
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85 if (ret == DROPBEAR_FAILURE) {
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86 m_mp_free_multi(&key->e, &key->n, NULL);
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87 }
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88 return ret;
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89 }
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90
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91 /* Same as buf_get_rsa_pub_key, but reads private bits at the end.
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92 * Loads a private rsa key from a buffer
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93 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
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94 int buf_get_rsa_priv_key(buffer* buf, dropbear_rsa_key *key) {
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95 int ret = DROPBEAR_FAILURE;
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96
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97 TRACE(("enter buf_get_rsa_priv_key"))
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98 dropbear_assert(key != NULL);
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99
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100 if (buf_get_rsa_pub_key(buf, key) == DROPBEAR_FAILURE) {
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101 TRACE(("leave buf_get_rsa_priv_key: pub: ret == DROPBEAR_FAILURE"))
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102 return DROPBEAR_FAILURE;
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103 }
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104
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105 key->d = NULL;
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106 key->p = NULL;
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107 key->q = NULL;
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108
807
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109 m_mp_alloc_init_multi(&key->d, NULL);
4
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110 if (buf_getmpint(buf, key->d) == DROPBEAR_FAILURE) {
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111 TRACE(("leave buf_get_rsa_priv_key: d: 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->pos == buf->len) {
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116 /* old Dropbear private keys didn't keep p and q, so we will ignore them*/
4
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117 } else {
805
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118 m_mp_alloc_init_multi(&key->p, &key->q, NULL);
4
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119
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120 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE) {
165
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121 TRACE(("leave buf_get_rsa_priv_key: p: ret == DROPBEAR_FAILURE"))
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122 goto out;
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123 }
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124
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125 if (buf_getmpint(buf, key->q) == DROPBEAR_FAILURE) {
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126 TRACE(("leave buf_get_rsa_priv_key: q: ret == DROPBEAR_FAILURE"))
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127 goto out;
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128 }
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129 }
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130
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131 ret = DROPBEAR_SUCCESS;
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132 out:
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133 if (ret == DROPBEAR_FAILURE) {
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134 m_mp_free_multi(&key->d, &key->p, &key->q, NULL);
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135 }
165
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136 TRACE(("leave buf_get_rsa_priv_key"))
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1249
diff changeset
137 return ret;
4
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138 }
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139
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140
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diff changeset
141 /* Clear and free the memory used by a public or private key */
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
142 void rsa_key_free(dropbear_rsa_key *key) {
4
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143
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
144 TRACE2(("enter rsa_key_free"))
4
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145
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diff changeset
146 if (key == NULL) {
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
147 TRACE2(("leave rsa_key_free: key == NULL"))
4
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148 return;
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149 }
1409
c721e8c42d2a add m_mp_free_multi, be more careful freeing when failing to load keys
Matt Johnston <matt@ucc.asn.au>
parents: 1402
diff changeset
150 m_mp_free_multi(&key->d, &key->e, &key->p, &key->q, &key->n, NULL);
4
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151 m_free(key);
731
9a5438271556 Move the more verbose TRACE() statements into TRACE2()
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
152 TRACE2(("leave rsa_key_free"))
4
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153 }
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154
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parents:
diff changeset
155 /* Put the public rsa key into the buffer in the required format:
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parents:
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156 *
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157 * string "ssh-rsa"
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158 * mp_int e
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159 * mp_int n
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160 */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1409
diff changeset
161 void buf_put_rsa_pub_key(buffer* buf, const dropbear_rsa_key *key) {
4
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162
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 84
diff changeset
163 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
164 dropbear_assert(key != NULL);
4
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165
1123
d7b752525b91 buf_getstring and buf_putstring now use non-unsigned char*
Matt Johnston <matt@ucc.asn.au>
parents: 1094
diff changeset
166 buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
4
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167 buf_putmpint(buf, key->e);
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diff changeset
168 buf_putmpint(buf, key->n);
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169
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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parents: 84
diff changeset
170 TRACE(("leave buf_put_rsa_pub_key"))
4
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171
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diff changeset
172 }
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173
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parents:
diff changeset
174 /* Same as buf_put_rsa_pub_key, but with the private "x" key appended */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1409
diff changeset
175 void buf_put_rsa_priv_key(buffer* buf, const dropbear_rsa_key *key) {
4
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176
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
177 TRACE(("enter buf_put_rsa_priv_key"))
4
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diff changeset
178
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
179 dropbear_assert(key != NULL);
4
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parents:
diff changeset
180 buf_put_rsa_pub_key(buf, key);
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parents:
diff changeset
181 buf_putmpint(buf, key->d);
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parents:
diff changeset
182
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parents:
diff changeset
183 /* new versions have p and q, old versions don't */
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parents:
diff changeset
184 if (key->p) {
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parents:
diff changeset
185 buf_putmpint(buf, key->p);
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parents:
diff changeset
186 }
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parents:
diff changeset
187 if (key->q) {
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parents:
diff changeset
188 buf_putmpint(buf, key->q);
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diff changeset
189 }
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diff changeset
190
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191
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
192 TRACE(("leave buf_put_rsa_priv_key"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193
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parents:
diff changeset
194 }
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parents:
diff changeset
195
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
196 #if DROPBEAR_SIGNKEY_VERIFY
4
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parents:
diff changeset
197 /* Verify a signature in buf, made on data by the key given.
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parents:
diff changeset
198 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
199 int buf_rsa_verify(buffer * buf, const dropbear_rsa_key *key,
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
200 enum signature_type sigtype, const buffer *data_buf) {
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
201 unsigned int slen;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
202 DEF_MP_INT(rsa_s);
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
203 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
204 DEF_MP_INT(rsa_em);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
205 int ret = DROPBEAR_FAILURE;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206
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
207 TRACE(("enter buf_rsa_verify"))
34
e2a1eaa19f22 Client mostly works up to password auth
Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
208
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
209 dropbear_assert(key != NULL);
4
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parents:
diff changeset
210
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
211 m_mp_init_multi(&rsa_mdash, &rsa_s, &rsa_em, NULL);
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212
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parents:
diff changeset
213 slen = buf_getint(buf);
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
214 if (slen != (unsigned int)mp_ubin_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
215 TRACE(("bad size"))
4
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parents:
diff changeset
216 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
219 if (mp_from_ubin(&rsa_s, buf_getptr(buf, buf->len - buf->pos),
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 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
221 TRACE(("failed reading rsa_s"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 /* check that s <= n-1 */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 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
227 TRACE(("s > n-1"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 /* create the magic PKCS padded value */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
232 rsa_pad_em(key, data_buf, &rsa_em, sigtype);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 if (mp_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
235 TRACE(("failed exptmod rsa_s"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 goto out;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
239 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
240 /* 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
241 TRACE(("success!"))
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 ret = DROPBEAR_SUCCESS;
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
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 out:
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
246 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
247 TRACE(("leave buf_rsa_verify: ret %d", ret))
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
248 return ret;
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
249 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 #endif /* DROPBEAR_SIGNKEY_VERIFY */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 /* 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
254 * to the buffer */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
255 void buf_put_rsa_sign(buffer* buf, const dropbear_rsa_key *key,
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
256 enum signature_type sigtype, const buffer *data_buf) {
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
257 const char *name = NULL;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
258 unsigned int nsize, ssize, namelen = 0;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 unsigned int i;
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
260 size_t written;
84
29a5c7c62350 default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
parents: 70
diff changeset
261 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
262 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
263 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
264 DEF_MP_INT(rsa_tmp3);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265
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
266 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
267 dropbear_assert(key != NULL);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
269 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
270
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
271 rsa_pad_em(key, data_buf, &rsa_tmp1, sigtype);
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
272
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
273 /* 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
274
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
275 #if DROPBEAR_RSA_BLINDING
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
276
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
277 /* 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
278
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 165
diff changeset
279 /* generate the r blinding value */
c9483550701b - refactored random mp_int generation and byte->mp_int code
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diff changeset
280 /* rsa_tmp2 is r */
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 165
diff changeset
281 gen_random_mpint(key->n, &rsa_tmp2);
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 165
diff changeset
282
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 165
diff changeset
283 /* 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
284 /* 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
285
340
454a34b2dfd1 Fixes from Erik Hovland:
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parents: 276
diff changeset
286 /* rsa_s used as a temp var*/
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parents: 276
diff changeset
287 if (mp_exptmod(&rsa_tmp2, key->e, key->n, &rsa_s) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 586
diff changeset
288 dropbear_exit("RSA error");
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
289 }
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
290 if (mp_invmod(&rsa_tmp2, key->n, &rsa_tmp3) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 586
diff changeset
291 dropbear_exit("RSA error");
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
292 }
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
293 if (mp_mulmod(&rsa_tmp1, &rsa_s, key->n, &rsa_tmp2) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
294 dropbear_exit("RSA error");
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
295 }
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
296
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
297 /* rsa_tmp2 is em' */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
298 /* s' = (em')^d mod n */
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
299 if (mp_exptmod(&rsa_tmp2, key->d, key->n, &rsa_tmp1) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 586
diff changeset
300 dropbear_exit("RSA error");
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
301 }
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
302
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
303 /* rsa_tmp1 is s' */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
304 /* rsa_tmp3 is r^(-1) mod n */
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
305 /* s = (s')r^(-1) mod n */
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
306 if (mp_mulmod(&rsa_tmp1, &rsa_tmp3, key->n, &rsa_s) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
307 dropbear_exit("RSA error");
340
454a34b2dfd1 Fixes from Erik Hovland:
Matt Johnston <matt@ucc.asn.au>
parents: 276
diff changeset
308 }
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 165
diff changeset
309
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
310 #else
c9483550701b - refactored random mp_int generation and byte->mp_int code
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diff changeset
311
4
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312 /* s = em^d mod n */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
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parents: 165
diff changeset
313 /* 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
314 if (mp_exptmod(&rsa_tmp1, key->d, key->n, &rsa_s) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 586
diff changeset
315 dropbear_exit("RSA error");
4
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diff changeset
316 }
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
317
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
318 #endif /* DROPBEAR_RSA_BLINDING */
188
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
319
c9483550701b - refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
320 mp_clear_multi(&rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL);
4
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parents:
diff changeset
321
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parents:
diff changeset
322 /* create the signature to return */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
323 name = signature_name_from_type(sigtype, &namelen);
ba6fc7afe1c5 use sigtype where appropriate
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parents: 1546
diff changeset
324 buf_putstring(buf, name, namelen);
4
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diff changeset
325
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
326 nsize = mp_ubin_size(key->n);
4
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parents:
diff changeset
327
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
328 /* string rsa_signature_blob length */
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parents:
diff changeset
329 buf_putint(buf, nsize);
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parents:
diff changeset
330 /* pad out s to same length as n */
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
331 ssize = mp_ubin_size(&rsa_s);
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 216
diff changeset
332 dropbear_assert(ssize <= nsize);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
333 for (i = 0; i < nsize-ssize; i++) {
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
334 buf_putbyte(buf, 0x00);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
335 }
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
336
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
337 if (mp_to_ubin(&rsa_s, buf_getwriteptr(buf, ssize), ssize, &written) != MP_OKAY) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 586
diff changeset
338 dropbear_exit("RSA error");
4
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parents:
diff changeset
339 }
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
340 buf_incrwritepos(buf, written);
4
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parents:
diff changeset
341 mp_clear(&rsa_s);
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parents:
diff changeset
342
1402
553c6bb80265 fix DEBUG_* condition
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
343 #if defined(DEBUG_RSA) && DEBUG_TRACE
907
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
344 if (!debug_trace) {
4a74c58e11fc Make some debug info conditional
Matt Johnston <matt@ucc.asn.au>
parents: 858
diff changeset
345 printhex("RSA sig", buf->data, buf->len);
4a74c58e11fc Make some debug info conditional
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parents: 858
diff changeset
346 }
4
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parents:
diff changeset
347 #endif
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parents:
diff changeset
348
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parents:
diff changeset
349
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
350 TRACE(("leave buf_put_rsa_sign"))
4
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diff changeset
351 }
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parents:
diff changeset
352
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
353 /* Creates the message value as expected by PKCS,
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
354 see rfc8017 section 9.2 */
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1409
diff changeset
355 static void rsa_pad_em(const dropbear_rsa_key * key,
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
356 const buffer *data_buf, mp_int * rsa_em, enum signature_type sigtype) {
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
357 /* EM = 0x00 || 0x01 || PS || 0x00 || T
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
358 PS is padding of 0xff to make EM the size of key->n
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
359
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
360 T is the DER encoding of the hash alg (sha1 or sha256)
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
361 */
4
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parents:
diff changeset
362
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
363 /* From rfc8017 page 46 */
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
364 #if DROPBEAR_RSA_SHA1
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
365 const unsigned char T_sha1[] =
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
366 {0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b,
4
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
367 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14};
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
368 #endif
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
369 #if DROPBEAR_RSA_SHA256
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
370 const unsigned char T_sha256[] =
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
371 {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01,
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
372 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20};
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
373 #endif
198
65585699d980 * add a "label" argument to printhex()
Matt Johnston <matt@ucc.asn.au>
parents: 188
diff changeset
374
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
375 int Tlen = 0;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
376 const unsigned char *T = NULL;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
377 const struct ltc_hash_descriptor *hash_desc = NULL;
70
b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents: 34
diff changeset
378 buffer * rsa_EM = NULL;
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
379 hash_state hs;
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
380 unsigned int nsize;
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
381
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
382 switch (sigtype) {
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
383 #if DROPBEAR_RSA_SHA1
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
384 case DROPBEAR_SIGNATURE_RSA_SHA1:
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
385 Tlen = sizeof(T_sha1);
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
386 T = T_sha1;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
387 hash_desc = &sha1_desc;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
388 break;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
389 #endif
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
390 #if DROPBEAR_RSA_SHA256
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1674
diff changeset
391 case DROPBEAR_SIGNATURE_RSA_SHA256:
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
392 Tlen = sizeof(T_sha256);
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
393 T = T_sha256;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
394 hash_desc = &sha256_desc;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
395 break;
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
396 #endif
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
397 default:
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
398 assert(0);
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
399 }
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
400
1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
401
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
Steffen Jaeckel <s@jaeckel.eu>
parents: 1675
diff changeset
402 nsize = mp_ubin_size(key->n);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
403
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
404 rsa_EM = buf_new(nsize);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
405 /* type byte */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
406 buf_putbyte(rsa_EM, 0x00);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
407 buf_putbyte(rsa_EM, 0x01);
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
408 /* Padding with PS 0xFF bytes */
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
409 while(rsa_EM->pos != rsa_EM->size - (1 + Tlen + hash_desc->hashsize)) {
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 buf_putbyte(rsa_EM, 0xff);
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 }
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
412 buf_putbyte(rsa_EM, 0x00);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
413 /* Magic ASN1 stuff */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
414 buf_putbytes(rsa_EM, T, Tlen);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
415
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
416 /* The hash of the data */
1674
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
417 hash_desc->init(&hs);
ba6fc7afe1c5 use sigtype where appropriate
Matt Johnston <matt@ucc.asn.au>
parents: 1546
diff changeset
418 hash_desc->process(&hs, data_buf->data, data_buf->len);
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419 hash_desc->done(&hs, buf_getwriteptr(rsa_EM, hash_desc->hashsize));
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420 buf_incrwritepos(rsa_EM, hash_desc->hashsize);
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421
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422 dropbear_assert(rsa_EM->pos == rsa_EM->size);
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423
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424 /* Create the mp_int from the encoded bytes */
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425 buf_setpos(rsa_EM, 0);
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426 bytes_to_mp(rsa_em, buf_getptr(rsa_EM, rsa_EM->size),
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427 rsa_EM->size);
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428 buf_free(rsa_EM);
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429 }
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430
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431 #endif /* DROPBEAR_RSA */