annotate ecdsa.c @ 911:367205a2c1c4 asm

Include license information for Cryptogams routines
author Matt Johnston <matt@ucc.asn.au>
date Thu, 27 Feb 2014 22:30:56 +0800
parents c19acba28590
children c0b1b7eb5c84
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "options.h"
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2 #include "includes.h"
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3 #include "dbutil.h"
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4 #include "crypto_desc.h"
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5 #include "ecc.h"
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6 #include "ecdsa.h"
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7 #include "signkey.h"
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8
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9 #ifdef DROPBEAR_ECDSA
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10
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11 int signkey_is_ecdsa(enum signkey_type type)
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12 {
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13 return type == DROPBEAR_SIGNKEY_ECDSA_NISTP256
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14 || type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
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15 || type == DROPBEAR_SIGNKEY_ECDSA_NISTP521;
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16 }
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17
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18 enum signkey_type ecdsa_signkey_type(ecc_key * key) {
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19 #ifdef DROPBEAR_ECC_256
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20 if (key->dp == ecc_curve_nistp256.dp) {
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21 return DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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22 }
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23 #endif
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24 #ifdef DROPBEAR_ECC_384
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25 if (key->dp == ecc_curve_nistp384.dp) {
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26 return DROPBEAR_SIGNKEY_ECDSA_NISTP384;
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27 }
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28 #endif
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29 #ifdef DROPBEAR_ECC_521
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30 if (key->dp == ecc_curve_nistp521.dp) {
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31 return DROPBEAR_SIGNKEY_ECDSA_NISTP521;
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32 }
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33 #endif
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34 return DROPBEAR_SIGNKEY_NONE;
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35 }
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36
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37 ecc_key *gen_ecdsa_priv_key(unsigned int bit_size) {
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38 const ltc_ecc_set_type *dp = NULL; /* curve domain parameters */
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39 ecc_key *new_key = NULL;
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40 switch (bit_size) {
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41 #ifdef DROPBEAR_ECC_256
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42 case 256:
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43 dp = ecc_curve_nistp256.dp;
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44 break;
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45 #endif
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46 #ifdef DROPBEAR_ECC_384
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47 case 384:
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48 dp = ecc_curve_nistp384.dp;
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49 break;
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50 #endif
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51 #ifdef DROPBEAR_ECC_521
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52 case 521:
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53 dp = ecc_curve_nistp521.dp;
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54 break;
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55 #endif
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56 }
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57 if (!dp) {
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58 dropbear_exit("Key size %d isn't valid. Try "
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59 #ifdef DROPBEAR_ECC_256
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60 "256 "
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61 #endif
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62 #ifdef DROPBEAR_ECC_384
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63 "384 "
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64 #endif
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65 #ifdef DROPBEAR_ECC_521
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66 "521 "
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67 #endif
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68 , bit_size);
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69 }
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70
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71 new_key = m_malloc(sizeof(*new_key));
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72 if (ecc_make_key_ex(NULL, dropbear_ltc_prng, new_key, dp) != CRYPT_OK) {
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73 dropbear_exit("ECC error");
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74 }
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75 return new_key;
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76 }
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77
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78 ecc_key *buf_get_ecdsa_pub_key(buffer* buf) {
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79 unsigned char *key_ident = NULL, *identifier = NULL;
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80 unsigned int key_ident_len, identifier_len;
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81 buffer *q_buf = NULL;
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82 struct dropbear_ecc_curve **curve;
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83 ecc_key *new_key = NULL;
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84
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85 /* string "ecdsa-sha2-[identifier]" */
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86 key_ident = buf_getstring(buf, &key_ident_len);
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87 /* string "[identifier]" */
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88 identifier = buf_getstring(buf, &identifier_len);
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89
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90 if (key_ident_len != identifier_len + strlen("ecdsa-sha2-")) {
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91 TRACE(("Bad identifier lengths"))
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92 goto out;
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diff changeset
93 }
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diff changeset
94 if (memcmp(&key_ident[strlen("ecdsa-sha2-")], identifier, identifier_len) != 0) {
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95 TRACE(("mismatching identifiers"))
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96 goto out;
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diff changeset
97 }
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98
767
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99 for (curve = dropbear_ecc_curves; *curve; curve++) {
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diff changeset
100 if (memcmp(identifier, (char*)(*curve)->name, strlen((char*)(*curve)->name)) == 0) {
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diff changeset
101 break;
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diff changeset
102 }
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diff changeset
103 }
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diff changeset
104 if (!*curve) {
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diff changeset
105 TRACE(("couldn't match ecc curve"))
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106 goto out;
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diff changeset
107 }
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diff changeset
108
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diff changeset
109 /* string Q */
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110 q_buf = buf_getstringbuf(buf);
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111 new_key = buf_get_ecc_raw_pubkey(q_buf, *curve);
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112
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113 out:
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114 m_free(key_ident);
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115 m_free(identifier);
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116 if (q_buf) {
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117 buf_free(q_buf);
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118 q_buf = NULL;
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119 }
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120 TRACE(("leave buf_get_ecdsa_pub_key"))
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121 return new_key;
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122 }
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123
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124 ecc_key *buf_get_ecdsa_priv_key(buffer *buf) {
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diff changeset
125 ecc_key *new_key = NULL;
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126 TRACE(("enter buf_get_ecdsa_priv_key"))
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127 new_key = buf_get_ecdsa_pub_key(buf);
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diff changeset
128 if (!new_key) {
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129 return NULL;
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diff changeset
130 }
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diff changeset
131
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132 if (buf_getmpint(buf, new_key->k) != DROPBEAR_SUCCESS) {
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diff changeset
133 ecc_free(new_key);
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134 return NULL;
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diff changeset
135 }
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diff changeset
136
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137 return new_key;
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diff changeset
138 }
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diff changeset
139
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diff changeset
140 void buf_put_ecdsa_pub_key(buffer *buf, ecc_key *key) {
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diff changeset
141 struct dropbear_ecc_curve *curve = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
142 unsigned char key_ident[30];
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
143
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
144 curve = curve_for_dp(key->dp);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
145 snprintf((char*)key_ident, sizeof(key_ident), "ecdsa-sha2-%s", curve->name);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
146 buf_putstring(buf, key_ident, strlen(key_ident));
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
147 buf_putstring(buf, curve->name, strlen(curve->name));
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
148 buf_put_ecc_raw_pubkey_string(buf, key);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
149 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
150
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
151 void buf_put_ecdsa_priv_key(buffer *buf, ecc_key *key) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
152 buf_put_ecdsa_pub_key(buf, key);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
153 buf_putmpint(buf, key->k);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
154 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
155
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
156 void buf_put_ecdsa_sign(buffer *buf, ecc_key *key, buffer *data_buf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
157 /* Based on libtomcrypt's ecc_sign_hash but without the asn1 */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
158 int err = DROPBEAR_FAILURE;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
159 struct dropbear_ecc_curve *curve = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
160 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
161 unsigned char hash[64];
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
162 void *e = NULL, *p = NULL, *s = NULL, *r;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
163 unsigned char key_ident[30];
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
164 buffer *sigbuf = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
165
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
166 TRACE(("buf_put_ecdsa_sign"))
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
167 curve = curve_for_dp(key->dp);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
168
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
169 if (ltc_init_multi(&r, &s, &p, &e, NULL) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
170 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
171 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
172
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
173 curve->hash_desc->init(&hs);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
174 curve->hash_desc->process(&hs, data_buf->data, data_buf->len);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
175 curve->hash_desc->done(&hs, hash);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
176
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
177 if (ltc_mp.unsigned_read(e, hash, curve->hash_desc->hashsize) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
178 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
179 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
180
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
181 if (ltc_mp.read_radix(p, (char *)key->dp->order, 16) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
182 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
183 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
184
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
185 for (;;) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
186 ecc_key R_key; /* ephemeral key */
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
187 if (ecc_make_key_ex(NULL, dropbear_ltc_prng, &R_key, key->dp) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
188 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
189 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
190 if (ltc_mp.mpdiv(R_key.pubkey.x, p, NULL, r) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
191 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
192 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
193 if (ltc_mp.compare_d(r, 0) == LTC_MP_EQ) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
194 /* try again */
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
195 ecc_free(&R_key);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
196 continue;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
197 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
198 /* k = 1/k */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
199 if (ltc_mp.invmod(R_key.k, p, R_key.k) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
200 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
201 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
202 /* s = xr */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
203 if (ltc_mp.mulmod(key->k, r, p, s) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
204 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
205 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
206 /* s = e + xr */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
207 if (ltc_mp.add(e, s, s) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
208 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
209 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
210 if (ltc_mp.mpdiv(s, p, NULL, s) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
211 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
212 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
213 /* s = (e + xr)/k */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
214 if (ltc_mp.mulmod(s, R_key.k, p, s) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
215 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
216 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
217 ecc_free(&R_key);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
218
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
219 if (ltc_mp.compare_d(s, 0) != LTC_MP_EQ) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
220 break;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
221 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
222 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
223
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
224 snprintf((char*)key_ident, sizeof(key_ident), "ecdsa-sha2-%s", curve->name);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
225 buf_putstring(buf, key_ident, strlen(key_ident));
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
226 /* enough for nistp521 */
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
227 sigbuf = buf_new(200);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
228 buf_putmpint(sigbuf, (mp_int*)r);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
229 buf_putmpint(sigbuf, (mp_int*)s);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
230 buf_putbufstring(buf, sigbuf);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
231
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
232 err = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
233
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
234 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
235 if (r && s && p && e) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
236 ltc_deinit_multi(r, s, p, e, NULL);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
237 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
238
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
239 if (sigbuf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
240 buf_free(sigbuf);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
241 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
242
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
243 if (err == DROPBEAR_FAILURE) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
244 dropbear_exit("ECC error");
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
245 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
246 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
247
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
248 /* returns values in s and r
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
249 returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 846
diff changeset
250 static int buf_get_ecdsa_verify_params(buffer *buf,
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 846
diff changeset
251 void *r, void* s) {
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
252 int ret = DROPBEAR_FAILURE;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
253 unsigned int sig_len;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
254 unsigned int sig_pos;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
255
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
256 sig_len = buf_getint(buf);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
257 sig_pos = buf->pos;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
258 if (buf_getmpint(buf, r) != DROPBEAR_SUCCESS) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
259 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
260 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
261 if (buf_getmpint(buf, s) != DROPBEAR_SUCCESS) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
262 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
263 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
264 if (buf->pos - sig_pos != sig_len) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
265 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
266 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
267 ret = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
268
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
269 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
270 return ret;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
271 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
272
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
273
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
274 int buf_ecdsa_verify(buffer *buf, ecc_key *key, buffer *data_buf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
275 /* Based on libtomcrypt's ecc_verify_hash but without the asn1 */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
276 int ret = DROPBEAR_FAILURE;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
277 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
278 struct dropbear_ecc_curve *curve = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
279 unsigned char hash[64];
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
280 ecc_point *mG = NULL, *mQ = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
281 void *r = NULL, *s = NULL, *v = NULL, *w = NULL, *u1 = NULL, *u2 = NULL,
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
282 *e = NULL, *p = NULL, *m = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
283 void *mp = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
284
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
285 /* verify
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
286 *
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
287 * w = s^-1 mod n
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
288 * u1 = xw
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
289 * u2 = rw
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
290 * X = u1*G + u2*Q
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
291 * v = X_x1 mod n
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
292 * accept if v == r
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
293 */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
294
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
295 TRACE(("buf_ecdsa_verify"))
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
296 curve = curve_for_dp(key->dp);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
297
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
298 mG = ltc_ecc_new_point();
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
299 mQ = ltc_ecc_new_point();
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
300 if (ltc_init_multi(&r, &s, &v, &w, &u1, &u2, &p, &e, &m, NULL) != CRYPT_OK
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
301 || !mG
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
302 || !mQ) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
303 dropbear_exit("ECC error");
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
304 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
305
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 846
diff changeset
306 if (buf_get_ecdsa_verify_params(buf, r, s) != DROPBEAR_SUCCESS) {
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
307 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
308 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
309
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
310 curve->hash_desc->init(&hs);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
311 curve->hash_desc->process(&hs, data_buf->data, data_buf->len);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
312 curve->hash_desc->done(&hs, hash);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
313
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
314 if (ltc_mp.unsigned_read(e, hash, curve->hash_desc->hashsize) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
315 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
316 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
317
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
318 /* get the order */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
319 if (ltc_mp.read_radix(p, (char *)key->dp->order, 16) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
320 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
321 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
322
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
323 /* get the modulus */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
324 if (ltc_mp.read_radix(m, (char *)key->dp->prime, 16) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
325 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
326 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
327
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
328 /* check for zero */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
329 if (ltc_mp.compare_d(r, 0) == LTC_MP_EQ
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
330 || ltc_mp.compare_d(s, 0) == LTC_MP_EQ
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
331 || ltc_mp.compare(r, p) != LTC_MP_LT
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
332 || ltc_mp.compare(s, p) != LTC_MP_LT) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
333 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
334 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
335
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
336 /* w = s^-1 mod n */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
337 if (ltc_mp.invmod(s, p, w) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
338 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
339 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
340
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
341 /* u1 = ew */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
342 if (ltc_mp.mulmod(e, w, p, u1) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
343 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
344 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
345
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
346 /* u2 = rw */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
347 if (ltc_mp.mulmod(r, w, p, u2) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
348 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
349 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
350
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
351 /* find mG and mQ */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
352 if (ltc_mp.read_radix(mG->x, (char *)key->dp->Gx, 16) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
353 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
354 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
355 if (ltc_mp.read_radix(mG->y, (char *)key->dp->Gy, 16) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
356 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
357 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
358 if (ltc_mp.set_int(mG->z, 1) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
359 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
360 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
361
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
362 if (ltc_mp.copy(key->pubkey.x, mQ->x) != CRYPT_OK
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
363 || ltc_mp.copy(key->pubkey.y, mQ->y) != CRYPT_OK
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
364 || ltc_mp.copy(key->pubkey.z, mQ->z) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
365 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
366 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
367
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
368 /* compute u1*mG + u2*mQ = mG */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
369 if (ltc_mp.ecc_mul2add == NULL) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
370 if (ltc_mp.ecc_ptmul(u1, mG, mG, m, 0) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
371 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
372 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
373 if (ltc_mp.ecc_ptmul(u2, mQ, mQ, m, 0) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
374 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
375 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
376
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
377 /* find the montgomery mp */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
378 if (ltc_mp.montgomery_setup(m, &mp) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
379 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
380 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
381
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
382 /* add them */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
383 if (ltc_mp.ecc_ptadd(mQ, mG, mG, m, mp) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
384 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
385 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
386
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
387 /* reduce */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
388 if (ltc_mp.ecc_map(mG, m, mp) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
389 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
390 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
391 } else {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
392 /* use Shamir's trick to compute u1*mG + u2*mQ using half of the doubles */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
393 if (ltc_mp.ecc_mul2add(mG, u1, mQ, u2, mG, m) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
394 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
395 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
396 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
397
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
398 /* v = X_x1 mod n */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
399 if (ltc_mp.mpdiv(mG->x, p, NULL, v) != CRYPT_OK) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
400 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
401 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
402
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
403 /* does v == r */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
404 if (ltc_mp.compare(v, r) == LTC_MP_EQ) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
405 ret = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
406 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
407
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
408 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
409 ltc_ecc_del_point(mG);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
410 ltc_ecc_del_point(mQ);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
411 mp_clear_multi(r, s, v, w, u1, u2, p, e, m, NULL);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
412 if (mp != NULL) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
413 ltc_mp.montgomery_deinit(mp);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
414 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
415 return ret;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
416 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
417
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
418
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d1575fdc29a6 start on ecdsa keys
Matt Johnston <matt@ucc.asn.au>
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419
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c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
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420 #endif /* DROPBEAR_ECDSA */