Mercurial > dropbear
annotate rsa.c @ 1141:63ac2261e1b0
couple more changelog items
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 03 Aug 2015 23:17:50 +0800 |
parents | d7b752525b91 |
children | c6346c63281b |
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 "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) { |
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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 |
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Make sure that we clean up key parts if we fail during reading a rsa key
Matt Johnston <matt@ucc.asn.au>
parents:
276
diff
changeset
|
121 ret = DROPBEAR_SUCCESS; |
9a789fc03f40
Make sure that we clean up key parts if we fail during reading a rsa key
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276
diff
changeset
|
122 out: |
9a789fc03f40
Make sure that we clean up key parts if we fail during reading a rsa key
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parents:
276
diff
changeset
|
123 if (ret == DROPBEAR_FAILURE) { |
9a789fc03f40
Make sure that we clean up key parts if we fail during reading a rsa key
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parents:
276
diff
changeset
|
124 m_free(key->d); |
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Make sure that we clean up key parts if we fail during reading a rsa key
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276
diff
changeset
|
125 m_free(key->p); |
9a789fc03f40
Make sure that we clean up key parts if we fail during reading a rsa key
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parents:
276
diff
changeset
|
126 m_free(key->q); |
9a789fc03f40
Make sure that we clean up key parts if we fail during reading a rsa key
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parents:
276
diff
changeset
|
127 } |
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
|
128 TRACE(("leave buf_get_rsa_priv_key")) |
370
9a789fc03f40
Make sure that we clean up key parts if we fail during reading a rsa key
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276
diff
changeset
|
129 return ret; |
4
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Makefile.in contains updated files required
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|
130 } |
fe6bca95afa7
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|
131 |
fe6bca95afa7
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parents:
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|
132 |
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parents:
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|
133 /* 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
|
134 void rsa_key_free(dropbear_rsa_key *key) { |
4
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|
135 |
731
9a5438271556
Move the more verbose TRACE() statements into TRACE2()
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parents:
594
diff
changeset
|
136 TRACE2(("enter rsa_key_free")) |
4
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|
137 |
fe6bca95afa7
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parents:
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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changeset
|
140 return; |
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parents:
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changeset
|
141 } |
fe6bca95afa7
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parents:
diff
changeset
|
142 if (key->d) { |
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Makefile.in contains updated files required
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parents:
diff
changeset
|
143 mp_clear(key->d); |
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Makefile.in contains updated files required
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parents:
diff
changeset
|
144 m_free(key->d); |
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parents:
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|
145 } |
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parents:
diff
changeset
|
146 if (key->e) { |
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Makefile.in contains updated files required
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diff
changeset
|
147 mp_clear(key->e); |
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|
148 m_free(key->e); |
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|
149 } |
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150 if (key->n) { |
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parents:
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|
151 mp_clear(key->n); |
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|
152 m_free(key->n); |
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|
153 } |
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parents:
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|
154 if (key->p) { |
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changeset
|
155 mp_clear(key->p); |
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|
156 m_free(key->p); |
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|
157 } |
fe6bca95afa7
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changeset
|
158 if (key->q) { |
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Makefile.in contains updated files required
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|
159 mp_clear(key->q); |
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|
160 m_free(key->q); |
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|
161 } |
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changeset
|
162 m_free(key); |
731
9a5438271556
Move the more verbose TRACE() statements into TRACE2()
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parents:
594
diff
changeset
|
163 TRACE2(("leave rsa_key_free")) |
4
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changeset
|
164 } |
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|
165 |
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parents:
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changeset
|
166 /* Put the public rsa key into the buffer in the required format: |
fe6bca95afa7
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|
167 * |
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|
168 * string "ssh-rsa" |
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|
169 * mp_int e |
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|
170 * mp_int n |
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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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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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|
178 buf_putmpint(buf, key->e); |
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parents:
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changeset
|
179 buf_putmpint(buf, key->n); |
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|
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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changeset
|
182 |
fe6bca95afa7
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parents:
diff
changeset
|
183 } |
fe6bca95afa7
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parents:
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changeset
|
184 |
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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
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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
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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
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parents:
diff
changeset
|
191 buf_put_rsa_pub_key(buf, key); |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
192 buf_putmpint(buf, key->d); |
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parents:
diff
changeset
|
193 |
fe6bca95afa7
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parents:
diff
changeset
|
194 /* new versions have p and q, old versions don't */ |
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Makefile.in contains updated files required
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parents:
diff
changeset
|
195 if (key->p) { |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
196 buf_putmpint(buf, key->p); |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
197 } |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
198 if (key->q) { |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
199 buf_putmpint(buf, key->q); |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
200 } |
fe6bca95afa7
Makefile.in contains updated files required
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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
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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 |
fe6bca95afa7
Makefile.in contains updated files required
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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 } |
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248 |
188
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249 if (mp_cmp(&rsa_em, &rsa_mdash) == MP_EQ) { |
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250 /* signature is valid */ |
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251 TRACE(("success!")) |
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252 ret = DROPBEAR_SUCCESS; |
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253 } |
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254 |
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255 out: |
188
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256 mp_clear_multi(&rsa_mdash, &rsa_s, &rsa_em, NULL); |
165
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257 TRACE(("leave buf_rsa_verify: ret %d", ret)) |
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258 return ret; |
188
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259 } |
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260 |
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261 #endif /* DROPBEAR_SIGNKEY_VERIFY */ |
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262 |
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263 /* Sign the data presented with key, writing the signature contents |
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264 * to the buffer */ |
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265 void buf_put_rsa_sign(buffer* buf, dropbear_rsa_key *key, buffer *data_buf) { |
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266 unsigned int nsize, ssize; |
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267 unsigned int i; |
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268 DEF_MP_INT(rsa_s); |
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269 DEF_MP_INT(rsa_tmp1); |
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270 DEF_MP_INT(rsa_tmp2); |
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271 DEF_MP_INT(rsa_tmp3); |
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272 |
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273 TRACE(("enter buf_put_rsa_sign")) |
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274 dropbear_assert(key != NULL); |
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275 |
188
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276 m_mp_init_multi(&rsa_s, &rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL); |
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277 |
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278 rsa_pad_em(key, data_buf, &rsa_tmp1); |
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279 |
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280 /* the actual signing of the padded data */ |
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281 |
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282 #ifdef RSA_BLINDING |
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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 | 293 /* rsa_s used as a temp var*/ |
294 if (mp_exptmod(&rsa_tmp2, key->e, key->n, &rsa_s) != MP_OKAY) { | |
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295 dropbear_exit("RSA error"); |
340 | 296 } |
297 if (mp_invmod(&rsa_tmp2, key->n, &rsa_tmp3) != MP_OKAY) { | |
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298 dropbear_exit("RSA error"); |
340 | 299 } |
300 if (mp_mulmod(&rsa_tmp1, &rsa_s, key->n, &rsa_tmp2) != MP_OKAY) { | |
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301 dropbear_exit("RSA error"); |
340 | 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 | 306 if (mp_exptmod(&rsa_tmp2, key->d, key->n, &rsa_tmp1) != MP_OKAY) { |
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307 dropbear_exit("RSA error"); |
340 | 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 | 313 if (mp_mulmod(&rsa_tmp1, &rsa_tmp3, key->n, &rsa_s) != MP_OKAY) { |
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314 dropbear_exit("RSA error"); |
340 | 315 } |
188
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316 |
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317 #else |
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318 |
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319 /* s = em^d mod n */ |
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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) { |
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322 dropbear_exit("RSA error"); |
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323 } |
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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 */ |
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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); |
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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
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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 |
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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 */ |
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371 static void rsa_pad_em(dropbear_rsa_key * key, |
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372 buffer *data_buf, mp_int * rsa_em) { |
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373 |
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374 /* ASN1 designator (including the 0x00 preceding) */ |
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375 const unsigned char rsa_asn1_magic[] = |
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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}; |
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378 const unsigned int RSA_ASN1_MAGIC_LEN = 16; |
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379 |
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380 buffer * rsa_EM = NULL; |
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381 hash_state hs; |
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382 unsigned int nsize; |
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383 |
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384 dropbear_assert(key != NULL); |
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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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401 sha1_process(&hs, data_buf->data, data_buf->len); |
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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 |
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405 dropbear_assert(rsa_EM->pos == rsa_EM->size); |
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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); |
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409 bytes_to_mp(rsa_em, buf_getptr(rsa_EM, rsa_EM->size), |
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410 rsa_EM->size); |
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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 */ |