Mercurial > dropbear
annotate dss.c @ 971:763979a9c1f1 coverity
merge
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 19 Aug 2014 23:36:46 +0800 |
parents | 220f55d540ae |
children | c45d65392c1a |
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 #include "includes.h" |
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26 #include "dbutil.h" |
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27 #include "bignum.h" |
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28 #include "dss.h" |
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29 #include "buffer.h" |
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30 #include "ssh.h" |
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31 #include "dbrandom.h" |
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32 |
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33 /* Handle DSS (Digital Signature Standard), aka DSA (D.S. Algorithm), |
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34 * operations, such as key reading, signing, verification. Key generation |
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35 * is in gendss.c, since it isn't required in the server itself. |
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36 * |
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37 * See FIPS186 or the Handbook of Applied Cryptography for details of the |
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38 * algorithm */ |
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39 |
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40 #ifdef DROPBEAR_DSS |
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41 |
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42 /* Load a dss key from a buffer, initialising the values. |
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43 * The key will have the same format as buf_put_dss_key. |
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44 * These should be freed with dss_key_free. |
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45 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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46 int buf_get_dss_pub_key(buffer* buf, dropbear_dss_key *key) { |
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47 |
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48 TRACE(("enter buf_get_dss_pub_key")) |
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49 dropbear_assert(key != NULL); |
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50 m_mp_alloc_init_multi(&key->p, &key->q, &key->g, &key->y, NULL); |
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51 key->x = NULL; |
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52 |
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53 buf_incrpos(buf, 4+SSH_SIGNKEY_DSS_LEN); /* int + "ssh-dss" */ |
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54 if (buf_getmpint(buf, key->p) == DROPBEAR_FAILURE |
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55 || buf_getmpint(buf, key->q) == DROPBEAR_FAILURE |
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56 || buf_getmpint(buf, key->g) == DROPBEAR_FAILURE |
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57 || buf_getmpint(buf, key->y) == DROPBEAR_FAILURE) { |
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58 TRACE(("leave buf_get_dss_pub_key: failed reading mpints")) |
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59 return DROPBEAR_FAILURE; |
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60 } |
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61 |
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62 if (mp_count_bits(key->p) < MIN_DSS_KEYLEN) { |
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63 dropbear_log(LOG_WARNING, "DSS key too short"); |
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64 TRACE(("leave buf_get_dss_pub_key: short key")) |
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65 return DROPBEAR_FAILURE; |
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66 } |
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67 |
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68 TRACE(("leave buf_get_dss_pub_key: success")) |
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69 return DROPBEAR_SUCCESS; |
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70 } |
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71 |
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72 /* Same as buf_get_dss_pub_key, but reads a private "x" key at the end. |
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73 * Loads a private dss key from a buffer |
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74 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
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75 int buf_get_dss_priv_key(buffer* buf, dropbear_dss_key *key) { |
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76 |
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77 int ret = DROPBEAR_FAILURE; |
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78 |
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79 dropbear_assert(key != NULL); |
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80 |
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81 ret = buf_get_dss_pub_key(buf, key); |
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82 if (ret == DROPBEAR_FAILURE) { |
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83 return DROPBEAR_FAILURE; |
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84 } |
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85 |
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86 m_mp_alloc_init_multi(&key->x, NULL); |
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87 ret = buf_getmpint(buf, key->x); |
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88 if (ret == DROPBEAR_FAILURE) { |
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89 m_free(key->x); |
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90 } |
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91 |
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92 return ret; |
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93 } |
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94 |
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95 |
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96 /* Clear and free the memory used by a public or private key */ |
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97 void dss_key_free(dropbear_dss_key *key) { |
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98 |
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99 TRACE2(("enter dsa_key_free")) |
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100 if (key == NULL) { |
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101 TRACE2(("enter dsa_key_free: key == NULL")) |
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102 return; |
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103 } |
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104 if (key->p) { |
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105 mp_clear(key->p); |
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106 m_free(key->p); |
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107 } |
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108 if (key->q) { |
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109 mp_clear(key->q); |
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110 m_free(key->q); |
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111 } |
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112 if (key->g) { |
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113 mp_clear(key->g); |
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114 m_free(key->g); |
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115 } |
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116 if (key->y) { |
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117 mp_clear(key->y); |
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118 m_free(key->y); |
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119 } |
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120 if (key->x) { |
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121 mp_clear(key->x); |
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122 m_free(key->x); |
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123 } |
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124 m_free(key); |
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125 TRACE2(("leave dsa_key_free")) |
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126 } |
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127 |
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|
128 /* put the dss public key into the buffer in the required format: |
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|
129 * |
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|
130 * string "ssh-dss" |
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|
131 * mpint p |
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|
132 * mpint q |
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|
133 * mpint g |
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|
134 * mpint y |
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|
135 */ |
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
|
136 void buf_put_dss_pub_key(buffer* buf, dropbear_dss_key *key) { |
4
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|
137 |
241
c5d3ef11155f
* use own assertions which should get logged properly
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188
diff
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|
138 dropbear_assert(key != NULL); |
4
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changeset
|
139 buf_putstring(buf, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN); |
fe6bca95afa7
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diff
changeset
|
140 buf_putmpint(buf, key->p); |
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|
141 buf_putmpint(buf, key->q); |
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Makefile.in contains updated files required
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|
142 buf_putmpint(buf, key->g); |
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Makefile.in contains updated files required
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parents:
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|
143 buf_putmpint(buf, key->y); |
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|
144 |
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|
145 } |
fe6bca95afa7
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|
146 |
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|
147 /* Same as buf_put_dss_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
|
148 void buf_put_dss_priv_key(buffer* buf, dropbear_dss_key *key) { |
4
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|
149 |
241
c5d3ef11155f
* use own assertions which should get logged properly
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188
diff
changeset
|
150 dropbear_assert(key != NULL); |
4
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|
151 buf_put_dss_pub_key(buf, key); |
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|
152 buf_putmpint(buf, key->x); |
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|
153 |
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|
154 } |
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|
155 |
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|
156 #ifdef DROPBEAR_SIGNKEY_VERIFY |
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157 /* Verify a DSS signature (in buf) made on data by the key given. |
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|
158 * returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */ |
760
f336d232fc63
Make _sign and _verify functions take a buffer* rather than void* and int
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696
diff
changeset
|
159 int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf) { |
4
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|
160 unsigned char msghash[SHA1_HASH_SIZE]; |
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Makefile.in contains updated files required
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changeset
|
161 hash_state hs; |
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Makefile.in contains updated files required
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diff
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|
162 int ret = DROPBEAR_FAILURE; |
84
29a5c7c62350
default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
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70
diff
changeset
|
163 DEF_MP_INT(val1); |
29a5c7c62350
default initialisers for mp_ints
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70
diff
changeset
|
164 DEF_MP_INT(val2); |
29a5c7c62350
default initialisers for mp_ints
Matt Johnston <matt@ucc.asn.au>
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70
diff
changeset
|
165 DEF_MP_INT(val3); |
29a5c7c62350
default initialisers for mp_ints
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70
diff
changeset
|
166 DEF_MP_INT(val4); |
4
fe6bca95afa7
Makefile.in contains updated files required
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|
167 char * string = NULL; |
fe6bca95afa7
Makefile.in contains updated files required
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|
168 int stringlen; |
fe6bca95afa7
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|
169 |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents:
150
diff
changeset
|
170 TRACE(("enter buf_dss_verify")) |
241
c5d3ef11155f
* use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents:
188
diff
changeset
|
171 dropbear_assert(key != NULL); |
4
fe6bca95afa7
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|
172 |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
34
diff
changeset
|
173 m_mp_init_multi(&val1, &val2, &val3, &val4, NULL); |
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
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34
diff
changeset
|
174 |
4
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|
175 /* get blob, check length */ |
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|
176 string = buf_getstring(buf, &stringlen); |
fe6bca95afa7
Makefile.in contains updated files required
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|
177 if (stringlen != 2*SHA1_HASH_SIZE) { |
fe6bca95afa7
Makefile.in contains updated files required
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|
178 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
179 } |
fe6bca95afa7
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|
180 |
fe6bca95afa7
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|
181 /* hash the data */ |
fe6bca95afa7
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diff
changeset
|
182 sha1_init(&hs); |
760
f336d232fc63
Make _sign and _verify functions take a buffer* rather than void* and int
Matt Johnston <matt@ucc.asn.au>
parents:
696
diff
changeset
|
183 sha1_process(&hs, data_buf->data, data_buf->len); |
4
fe6bca95afa7
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parents:
diff
changeset
|
184 sha1_done(&hs, msghash); |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
185 |
fe6bca95afa7
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parents:
diff
changeset
|
186 /* create the signature - s' and r' are the received signatures in buf */ |
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
187 /* w = (s')-1 mod q */ |
fe6bca95afa7
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parents:
diff
changeset
|
188 /* let val1 = s' */ |
188
c9483550701b
- refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents:
186
diff
changeset
|
189 bytes_to_mp(&val1, &string[SHA1_HASH_SIZE], SHA1_HASH_SIZE); |
c9483550701b
- refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents:
186
diff
changeset
|
190 |
4
fe6bca95afa7
Makefile.in contains updated files required
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parents:
diff
changeset
|
191 if (mp_cmp(&val1, key->q) != 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:
150
diff
changeset
|
192 TRACE(("verify failed, s' >= q")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
193 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
194 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
195 /* let val2 = w = (s')^-1 mod q*/ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
196 if (mp_invmod(&val1, key->q, &val2) != MP_OKAY) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
197 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
198 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
199 |
fe6bca95afa7
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parents:
diff
changeset
|
200 /* u1 = ((SHA(M')w) mod q */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
201 /* let val1 = SHA(M') = msghash */ |
188
c9483550701b
- refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents:
186
diff
changeset
|
202 bytes_to_mp(&val1, msghash, SHA1_HASH_SIZE); |
c9483550701b
- refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents:
186
diff
changeset
|
203 |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
204 /* let val3 = u1 = ((SHA(M')w) mod q */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
205 if (mp_mulmod(&val1, &val2, key->q, &val3) != MP_OKAY) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
206 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
207 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
208 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
209 /* u2 = ((r')w) mod q */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
210 /* let val1 = r' */ |
188
c9483550701b
- refactored random mp_int generation and byte->mp_int code
Matt Johnston <matt@ucc.asn.au>
parents:
186
diff
changeset
|
211 bytes_to_mp(&val1, &string[0], SHA1_HASH_SIZE); |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
212 if (mp_cmp(&val1, key->q) != 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:
150
diff
changeset
|
213 TRACE(("verify failed, r' >= q")) |
4
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
214 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
215 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
216 /* let val4 = u2 = ((r')w) mod q */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
217 if (mp_mulmod(&val1, &val2, key->q, &val4) != MP_OKAY) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
218 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
219 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
220 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
221 /* v = (((g)^u1 (y)^u2) mod p) mod q */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
222 /* val2 = g^u1 mod p */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
223 if (mp_exptmod(key->g, &val3, key->p, &val2) != MP_OKAY) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
224 goto out; |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
225 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
226 /* val3 = y^u2 mod p */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
227 if (mp_exptmod(key->y, &val4, key->p, &val3) != MP_OKAY) { |
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 /* val4 = ((g)^u1 (y)^u2) mod p */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
231 if (mp_mulmod(&val2, &val3, key->p, &val4) != MP_OKAY) { |
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 /* val2 = v = (((g)^u1 (y)^u2) mod p) mod q */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
235 if (mp_mod(&val4, key->q, &val2) != MP_OKAY) { |
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 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
239 /* check whether signatures verify */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
240 if (mp_cmp(&val2, &val1) == MP_EQ) { |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
241 /* good sig */ |
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: |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
246 mp_clear_multi(&val1, &val2, &val3, &val4, NULL); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
247 m_free(string); |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
248 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
249 return ret; |
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 } |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
252 #endif /* DROPBEAR_SIGNKEY_VERIFY */ |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
253 |
fe6bca95afa7
Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
254 /* Sign the data presented with key, writing the signature contents |
695
94aa1203be1e
DSS_PROTOK is not necessary now that private keys are included
Matt Johnston <matt@ucc.asn.au>
parents:
594
diff
changeset
|
255 * to the buffer */ |
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256 void buf_put_dss_sign(buffer* buf, dropbear_dss_key *key, buffer *data_buf) { |
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257 unsigned char msghash[SHA1_HASH_SIZE]; |
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258 unsigned int writelen; |
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259 unsigned int i; |
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260 DEF_MP_INT(dss_k); |
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261 DEF_MP_INT(dss_m); |
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262 DEF_MP_INT(dss_temp1); |
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263 DEF_MP_INT(dss_temp2); |
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264 DEF_MP_INT(dss_r); |
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265 DEF_MP_INT(dss_s); |
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266 hash_state hs; |
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267 |
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268 TRACE(("enter buf_put_dss_sign")) |
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269 dropbear_assert(key != NULL); |
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270 |
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271 /* hash the data */ |
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272 sha1_init(&hs); |
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273 sha1_process(&hs, data_buf->data, data_buf->len); |
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274 sha1_done(&hs, msghash); |
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275 |
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276 m_mp_init_multi(&dss_k, &dss_temp1, &dss_temp2, &dss_r, &dss_s, |
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277 &dss_m, NULL); |
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278 /* the random number generator's input has included the private key which |
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279 * avoids DSS's problem of private key exposure due to low entropy */ |
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280 gen_random_mpint(key->q, &dss_k); |
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281 |
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282 /* now generate the actual signature */ |
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283 bytes_to_mp(&dss_m, msghash, SHA1_HASH_SIZE); |
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284 |
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285 /* g^k mod p */ |
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286 if (mp_exptmod(key->g, &dss_k, key->p, &dss_temp1) != MP_OKAY) { |
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287 dropbear_exit("DSS error"); |
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288 } |
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289 /* r = (g^k mod p) mod q */ |
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290 if (mp_mod(&dss_temp1, key->q, &dss_r) != MP_OKAY) { |
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291 dropbear_exit("DSS error"); |
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292 } |
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293 |
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294 /* x*r mod q */ |
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295 if (mp_mulmod(&dss_r, key->x, key->q, &dss_temp1) != MP_OKAY) { |
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296 dropbear_exit("DSS error"); |
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297 } |
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298 /* (SHA1(M) + xr) mod q) */ |
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299 if (mp_addmod(&dss_m, &dss_temp1, key->q, &dss_temp2) != MP_OKAY) { |
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300 dropbear_exit("DSS error"); |
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301 } |
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302 |
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303 /* (k^-1) mod q */ |
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304 if (mp_invmod(&dss_k, key->q, &dss_temp1) != MP_OKAY) { |
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305 dropbear_exit("DSS error"); |
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306 } |
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307 |
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308 /* s = (k^-1(SHA1(M) + xr)) mod q */ |
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309 if (mp_mulmod(&dss_temp1, &dss_temp2, key->q, &dss_s) != MP_OKAY) { |
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310 dropbear_exit("DSS error"); |
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311 } |
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312 |
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313 buf_putstring(buf, SSH_SIGNKEY_DSS, SSH_SIGNKEY_DSS_LEN); |
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314 buf_putint(buf, 2*SHA1_HASH_SIZE); |
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315 |
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316 writelen = mp_unsigned_bin_size(&dss_r); |
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317 dropbear_assert(writelen <= SHA1_HASH_SIZE); |
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318 /* need to pad to 160 bits with leading zeros */ |
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319 for (i = 0; i < SHA1_HASH_SIZE - writelen; i++) { |
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320 buf_putbyte(buf, 0); |
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321 } |
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322 if (mp_to_unsigned_bin(&dss_r, buf_getwriteptr(buf, writelen)) |
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323 != MP_OKAY) { |
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324 dropbear_exit("DSS error"); |
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325 } |
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326 mp_clear(&dss_r); |
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327 buf_incrwritepos(buf, writelen); |
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328 |
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329 writelen = mp_unsigned_bin_size(&dss_s); |
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330 dropbear_assert(writelen <= SHA1_HASH_SIZE); |
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331 /* need to pad to 160 bits with leading zeros */ |
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332 for (i = 0; i < SHA1_HASH_SIZE - writelen; i++) { |
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333 buf_putbyte(buf, 0); |
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334 } |
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335 if (mp_to_unsigned_bin(&dss_s, buf_getwriteptr(buf, writelen)) |
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336 != MP_OKAY) { |
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337 dropbear_exit("DSS error"); |
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338 } |
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339 mp_clear(&dss_s); |
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340 buf_incrwritepos(buf, writelen); |
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341 |
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342 mp_clear_multi(&dss_k, &dss_temp1, &dss_temp2, &dss_r, &dss_s, |
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343 &dss_m, NULL); |
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344 |
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345 /* create the signature to return */ |
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346 |
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347 TRACE(("leave buf_put_dss_sign")) |
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348 } |
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349 |
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350 #endif /* DROPBEAR_DSS */ |