annotate ecdsa.c @ 1897:fe68c0244b97

Use signature type not key type for debug message
author Matt Johnston <matt@ucc.asn.au>
date Tue, 22 Mar 2022 23:28:24 +0800
parents 35d504d59c05
children
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1 #include "includes.h"
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2 #include "dbutil.h"
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3 #include "crypto_desc.h"
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4 #include "ecc.h"
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5 #include "ecdsa.h"
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6 #include "signkey.h"
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7
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8 #if DROPBEAR_ECDSA
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9
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10 int signkey_is_ecdsa(enum signkey_type type)
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11 {
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12 return type == DROPBEAR_SIGNKEY_ECDSA_NISTP256
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13 || type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
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14 || type == DROPBEAR_SIGNKEY_ECDSA_NISTP521;
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15 }
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16
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17 enum signkey_type ecdsa_signkey_type(const ecc_key * key) {
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18 #if DROPBEAR_ECC_256
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19 if (key->dp == ecc_curve_nistp256.dp) {
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20 return DROPBEAR_SIGNKEY_ECDSA_NISTP256;
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21 }
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22 #endif
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23 #if DROPBEAR_ECC_384
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24 if (key->dp == ecc_curve_nistp384.dp) {
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25 return DROPBEAR_SIGNKEY_ECDSA_NISTP384;
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26 }
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27 #endif
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28 #if DROPBEAR_ECC_521
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29 if (key->dp == ecc_curve_nistp521.dp) {
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30 return DROPBEAR_SIGNKEY_ECDSA_NISTP521;
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31 }
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32 #endif
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33 return DROPBEAR_SIGNKEY_NONE;
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34 }
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35
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36 ecc_key *gen_ecdsa_priv_key(unsigned int bit_size) {
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37 const ltc_ecc_set_type *dp = NULL; /* curve domain parameters */
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38 ecc_key *new_key = NULL;
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39 switch (bit_size) {
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40 #if DROPBEAR_ECC_256
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41 case 256:
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42 dp = ecc_curve_nistp256.dp;
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43 break;
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44 #endif
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45 #if DROPBEAR_ECC_384
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46 case 384:
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47 dp = ecc_curve_nistp384.dp;
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48 break;
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49 #endif
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50 #if DROPBEAR_ECC_521
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51 case 521:
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52 dp = ecc_curve_nistp521.dp;
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53 break;
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54 #endif
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55 }
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56 if (!dp) {
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57 dropbear_exit("Key size %d isn't valid. Try "
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58 #if DROPBEAR_ECC_256
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59 "256 "
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60 #endif
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61 #if DROPBEAR_ECC_384
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62 "384 "
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63 #endif
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64 #if DROPBEAR_ECC_521
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65 "521 "
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66 #endif
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67 , bit_size);
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68 }
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69
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70 new_key = m_malloc(sizeof(*new_key));
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71 if (ecc_make_key_ex(NULL, dropbear_ltc_prng, new_key, dp) != CRYPT_OK) {
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72 dropbear_exit("ECC error");
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73 }
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74 return new_key;
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75 }
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76
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77 ecc_key *buf_get_ecdsa_pub_key(buffer* buf) {
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78 unsigned char *key_ident = NULL, *identifier = NULL;
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79 unsigned int key_ident_len, identifier_len;
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80 buffer *q_buf = NULL;
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81 struct dropbear_ecc_curve **curve;
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82 ecc_key *new_key = NULL;
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83
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84 /* string "ecdsa-sha2-[identifier]" or "[email protected]" */
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85 key_ident = (unsigned char*)buf_getstring(buf, &key_ident_len);
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86 /* string "[identifier]" */
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87 identifier = (unsigned char*)buf_getstring(buf, &identifier_len);
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88
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89 if (strcmp (key_ident, "[email protected]") == 0) {
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90 if (strcmp (identifier, "nistp256") != 0) {
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91 TRACE(("mismatching identifiers"))
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92 goto out;
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diff changeset
93 }
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94 } else {
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95 if (key_ident_len != identifier_len + strlen ("ecdsa-sha2-")) {
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96 TRACE(("Bad identifier lengths"))
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97 goto out;
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diff changeset
98 }
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
egor-duda <egor-duda@users.noreply.github.com>
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diff changeset
99 if (memcmp(&key_ident[strlen ("ecdsa-sha2-")], identifier, identifier_len) != 0) {
35d504d59c05 Implement server-side support for sk-ecdsa U2F-backed keys (#142)
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diff changeset
100 TRACE(("mismatching identifiers"))
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diff changeset
101 goto out;
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diff changeset
102 }
767
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103 }
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104
767
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105 for (curve = dropbear_ecc_curves; *curve; curve++) {
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106 if (memcmp(identifier, (char*)(*curve)->name, strlen((char*)(*curve)->name)) == 0) {
767
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diff changeset
107 break;
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108 }
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109 }
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diff changeset
110 if (!*curve) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with
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111 TRACE(("couldn't match ecc curve"))
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112 goto out;
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diff changeset
113 }
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114
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c19acba28590 use oldstyle comments
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diff changeset
115 /* string Q */
767
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116 q_buf = buf_getstringbuf(buf);
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diff changeset
117 new_key = buf_get_ecc_raw_pubkey(q_buf, *curve);
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118
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119 out:
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120 m_free(key_ident);
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diff changeset
121 m_free(identifier);
767
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122 if (q_buf) {
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123 buf_free(q_buf);
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124 q_buf = NULL;
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125 }
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126 TRACE(("leave buf_get_ecdsa_pub_key"))
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127 return new_key;
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d1575fdc29a6 start on ecdsa keys
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128 }
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129
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130 ecc_key *buf_get_ecdsa_priv_key(buffer *buf) {
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diff changeset
131 ecc_key *new_key = NULL;
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diff changeset
132 TRACE(("enter buf_get_ecdsa_priv_key"))
70625eed40c9 A bit of work on ecdsa for host/auth keys
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diff changeset
133 new_key = buf_get_ecdsa_pub_key(buf);
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diff changeset
134 if (!new_key) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
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diff changeset
135 return NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
136 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
137
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
138 if (buf_getmpint(buf, new_key->k) != DROPBEAR_SUCCESS) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
139 ecc_free(new_key);
1000
c0b1b7eb5c84 Fix memory leak of ecdsa structure, found by Coverity
Matt Johnston <matt@ucc.asn.au>
parents: 857
diff changeset
140 m_free(new_key);
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
141 return NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
142 }
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 return new_key;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
145 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
146
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
147 void buf_put_ecdsa_pub_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
148 struct dropbear_ecc_curve *curve = NULL;
1105
c339657c9758 Turn local key_indent variable into char *
Gaël PORTAY <gael.portay@gmail.com>
parents: 1058
diff changeset
149 char key_ident[30];
793
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 curve = curve_for_dp(key->dp);
1105
c339657c9758 Turn local key_indent variable into char *
Gaël PORTAY <gael.portay@gmail.com>
parents: 1058
diff changeset
152 snprintf(key_ident, sizeof(key_ident), "ecdsa-sha2-%s", curve->name);
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1107
diff changeset
153 buf_putstring(buf, key_ident, strlen(key_ident));
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1107
diff changeset
154 buf_putstring(buf, curve->name, strlen(curve->name));
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
155 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
156 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
157
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
158 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
159 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
160 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
161 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
162
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
163 void buf_put_ecdsa_sign(buffer *buf, const ecc_key *key, const buffer *data_buf) {
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
164 /* 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
165 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
166 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
167 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
168 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
169 void *e = NULL, *p = NULL, *s = NULL, *r;
1105
c339657c9758 Turn local key_indent variable into char *
Gaël PORTAY <gael.portay@gmail.com>
parents: 1058
diff changeset
170 char key_ident[30];
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
171 buffer *sigbuf = NULL;
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 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
174 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
175
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
176 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
177 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
178 }
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 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
181 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
182 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
183
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
184 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
185 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
186 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
187
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
188 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
189 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
190 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
191
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
192 for (;;) {
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
193 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
194 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
195 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
196 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
197 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
198 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
199 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
200 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
201 /* try again */
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
202 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
203 continue;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
204 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
205 /* k = 1/k */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
206 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
207 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
208 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
209 /* s = xr */
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.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
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 */
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.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
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 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
218 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
219 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
220 /* 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
221 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
222 goto out;
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 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
225
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
226 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
227 break;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
228 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
229 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
230
1105
c339657c9758 Turn local key_indent variable into char *
Gaël PORTAY <gael.portay@gmail.com>
parents: 1058
diff changeset
231 snprintf(key_ident, sizeof(key_ident), "ecdsa-sha2-%s", curve->name);
1122
aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents: 1107
diff changeset
232 buf_putstring(buf, key_ident, strlen(key_ident));
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
233 /* 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
234 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
235 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
236 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
237 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
238
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
239 err = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
240
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
241 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
242 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
243 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
244 }
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 if (sigbuf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
247 buf_free(sigbuf);
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
248 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
249
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
250 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
251 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
252 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
253 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
254
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
255 /* returns values in s and r
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
256 returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 846
diff changeset
257 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
258 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
259 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
260 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
261 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
262
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
263 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
264 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
265 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
266 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
267 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
268 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
269 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
270 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
271 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
272 goto out;
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 ret = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
275
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
276 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
277 return ret;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
278 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
279
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
280
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
281 int buf_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf) {
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
282 /* 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
283 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
284 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
285 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
286 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
287 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
288 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
289 *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
290 void *mp = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
291
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
292 /* verify
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 * 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
295 * u1 = xw
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
296 * u2 = rw
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
297 * 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
298 * 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
299 * 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
300 */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
301
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
302 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
303 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
304
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
305 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
306 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
307 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
308 || !mG
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
309 || !mQ) {
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
310 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
311 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
312
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 846
diff changeset
313 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
314 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
315 }
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 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
318 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
319 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
320
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
321 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
322 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
323 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
324
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
325 /* get the order */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
326 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
327 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
328 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
329
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
330 /* get the modulus */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
331 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
332 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
333 }
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 /* check for zero */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
336 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
337 || 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
338 || 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
339 || 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
340 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
341 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
342
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
343 /* 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
344 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
345 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
346 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
347
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
348 /* u1 = ew */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
349 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
350 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
351 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
352
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
353 /* u2 = rw */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
354 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
355 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
356 }
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 /* 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
359 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
360 goto out;
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.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
363 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
364 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
365 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
366 goto out;
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
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.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
370 || 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
371 || 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
372 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
373 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
374
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
375 /* 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
376 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
377 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
378 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
379 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
380 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
381 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
382 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
383
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
384 /* 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
385 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
386 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
387 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
388
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
389 /* add them */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
390 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
391 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
392 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
393
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1122
diff changeset
394 /* reduce */
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
395 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
396 goto out;
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 } else {
1250
2bb4c662d1c2 more hard tab
Francois Perrad <francois.perrad@gadz.org>
parents: 1122
diff changeset
399 /* use Shamir's trick to compute u1*mG + u2*mQ using half of the doubles */
793
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
400 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
401 goto out;
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 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
404
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
405 /* 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
406 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
407 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
408 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
409
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
410 /* does v == r */
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
411 if (ltc_mp.compare(v, r) == LTC_MP_EQ) {
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412 ret = DROPBEAR_SUCCESS;
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413 }
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414
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415 out:
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416 ltc_ecc_del_point(mG);
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417 ltc_ecc_del_point(mQ);
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418 ltc_deinit_multi(r, s, v, w, u1, u2, p, e, m, NULL);
793
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419 if (mp != NULL) {
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420 ltc_mp.montgomery_deinit(mp);
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421 }
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422 return ret;
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423 }
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424
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425
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426
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427 #endif /* DROPBEAR_ECDSA */