dropbear: ecdsa.c annotate

annotate ecdsa.c @ 1632:c4bf28ccab97

packet: remove stale comment about "packet_type" (#63) clean up after 7f15910541 Signed-off-by: Konstantin Demin <[email protected]>

author	Konstantin Demin <rockdrilla@gmail.com>
date	Wed, 20 Mar 2019 17:33:15 +0300
parents	d68d61e7056a
children	35d504d59c05

rev	line source
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 #include "includes.h"
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 #include "dbutil.h"
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 #include "crypto_desc.h"
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	4 #include "ecc.h"
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	5 #include "ecdsa.h"
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	6 #include "signkey.h"
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	8 #if DROPBEAR_ECDSA
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	10 int signkey_is_ecdsa(enum signkey_type type)
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	11 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	12 return type == DROPBEAR_SIGNKEY_ECDSA_NISTP256
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	13 \|\| type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	14 \|\| type == DROPBEAR_SIGNKEY_ECDSA_NISTP521;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	15 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	16
1459 06d52bcb8094 Pointer parameter could be declared as pointing to const Francois Perrad <francois.perrad@gadz.org> parents: 1295 diff changeset	17 enum signkey_type ecdsa_signkey_type(const ecc_key * key) {
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	18 #if DROPBEAR_ECC_256
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	19 if (key->dp == ecc_curve_nistp256.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	20 return DROPBEAR_SIGNKEY_ECDSA_NISTP256;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	21 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	22 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	23 #if DROPBEAR_ECC_384
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	24 if (key->dp == ecc_curve_nistp384.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	25 return DROPBEAR_SIGNKEY_ECDSA_NISTP384;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	26 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	27 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	28 #if DROPBEAR_ECC_521
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	29 if (key->dp == ecc_curve_nistp521.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	30 return DROPBEAR_SIGNKEY_ECDSA_NISTP521;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	31 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	32 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	33 return DROPBEAR_SIGNKEY_NONE;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	34 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	35
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 ecc_key *gen_ecdsa_priv_key(unsigned int bit_size) {
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	37 const ltc_ecc_set_type dp = NULL; / curve domain parameters */
855 04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G. Matt Johnston <matt@ucc.asn.au> parents: 852 diff changeset	38 ecc_key *new_key = NULL;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 switch (bit_size) {
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	40 #if DROPBEAR_ECC_256
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 case 256:
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	42 dp = ecc_curve_nistp256.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	45 #if DROPBEAR_ECC_384
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 case 384:
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	47 dp = ecc_curve_nistp384.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	50 #if DROPBEAR_ECC_521
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 case 521:
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	52 dp = ecc_curve_nistp521.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 if (!dp) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 dropbear_exit("Key size %d isn't valid. Try "
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	58 #if DROPBEAR_ECC_256
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 "256 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	61 #if DROPBEAR_ECC_384
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 "384 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 #endif
1295 750ec4ec4cbe Convert #ifdef to #if, other build changes Matt Johnston <matt@ucc.asn.au> parents: 1250 diff changeset	64 #if DROPBEAR_ECC_521
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 "521 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 , bit_size);
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69
855 04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G. Matt Johnston <matt@ucc.asn.au> parents: 852 diff changeset	70 new_key = m_malloc(sizeof(*new_key));
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71 if (ecc_make_key_ex(NULL, dropbear_ltc_prng, new_key, dp) != CRYPT_OK) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 dropbear_exit("ECC error");
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 return new_key;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	77 ecc_key buf_get_ecdsa_pub_key(buffer buf) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	78 unsigned char key_ident = NULL, identifier = NULL;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	79 unsigned int key_ident_len, identifier_len;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	80 buffer *q_buf = NULL;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	81 struct dropbear_ecc_curve **curve;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	82 ecc_key *new_key = NULL;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	83
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	84 /* string "ecdsa-sha2-[identifier]" */
1122 aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings Matt Johnston <matt@ucc.asn.au> parents: 1107 diff changeset	85 key_ident = (unsigned char*)buf_getstring(buf, &key_ident_len);
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	86 /* string "[identifier]" */
1122 aaf576b27a10 Merge pull request #13 from gazoo74/fix-warnings Matt Johnston <matt@ucc.asn.au> parents: 1107 diff changeset	87 identifier = (unsigned char*)buf_getstring(buf, &identifier_len);
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	88
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	89 if (key_ident_len != identifier_len + strlen("ecdsa-sha2-")) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	90 TRACE(("Bad identifier lengths"))
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	91 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	92 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	93 if (memcmp(&key_ident[strlen("ecdsa-sha2-")], identifier, identifier_len) != 0) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	94 TRACE(("mismatching identifiers"))
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	95 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	96 }
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	98 for (curve = dropbear_ecc_curves; *curve; curve++) {
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	99 if (memcmp(identifier, (char)(curve)->name, strlen((char)(curve)->name)) == 0) {
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	100 break;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	101 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	102 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	103 if (!*curve) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	104 TRACE(("couldn't match ecc curve"))
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	105 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	106 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	107
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	108 /* string Q */
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	109 q_buf = buf_getstringbuf(buf);
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	110 new_key = buf_get_ecc_raw_pubkey(q_buf, *curve);
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	111
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	112 out:
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	113 m_free(key_ident);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	114 m_free(identifier);
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	115 if (q_buf) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	116 buf_free(q_buf);
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	117 q_buf = NULL;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	118 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	119 TRACE(("leave buf_get_ecdsa_pub_key"))
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	120 return new_key;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	123 ecc_key buf_get_ecdsa_priv_key(buffer buf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	124 ecc_key *new_key = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	125 TRACE(("enter buf_get_ecdsa_priv_key"))
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	126 new_key = buf_get_ecdsa_pub_key(buf);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	127 if (!new_key) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	128 return NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	129 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	130
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	131 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	132 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	133 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	134 return NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	135 }
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 return new_key;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	138 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	139
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	140 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	141 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	142 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	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);
1105 c339657c9758 Turn local key_indent variable into char * Gaël PORTAY <gael.portay@gmail.com> parents: 1058 diff changeset	145 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	146 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	147 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	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
1459 06d52bcb8094 Pointer parameter could be declared as pointing to const Francois Perrad <francois.perrad@gadz.org> parents: 1295 diff changeset	156 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	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;
1105 c339657c9758 Turn local key_indent variable into char * Gaël PORTAY <gael.portay@gmail.com> parents: 1058 diff changeset	163 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	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
1105 c339657c9758 Turn local key_indent variable into char * Gaël PORTAY <gael.portay@gmail.com> parents: 1058 diff changeset	224 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	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
1459 06d52bcb8094 Pointer parameter could be declared as pointing to const Francois Perrad <francois.perrad@gadz.org> parents: 1295 diff changeset	274 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	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 = u1G + u2Q
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 u1mG + u2mQ = 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
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 1122 diff changeset	387 /* reduce */
793 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 {
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 1122 diff changeset	392 /* use Shamir's trick to compute u1mG + u2mQ 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	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);
1058 063c38ea622b Fix some memory leaks in ecc code Matt Johnston <matt@ucc.asn.au> parents: 1000 diff changeset	411 ltc_deinit_multi(r, s, v, w, u1, u2, p, e, m, NULL);
793 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
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	419
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	420 #endif /* DROPBEAR_ECDSA */

Mercurial > dropbear

annotate ecdsa.c @ 1632:c4bf28ccab97