dropbear: ecdsa.c annotate

annotate ecdsa.c @ 1060:4c733310c21d nocircbuffer

reword comment for clarity

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 01 Mar 2015 23:26:42 +0800
parents	c0b1b7eb5c84
children	063c38ea622b

rev	line source
794 d386defb5376 more ecdsa signkey work, not correct Matt Johnston <matt@ucc.asn.au> parents: 793 diff changeset	1 #include "options.h"
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 #include "includes.h"
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 #include "dbutil.h"
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 #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	5 #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	6 #include "ecdsa.h"
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	7 #include "signkey.h"
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 #ifdef DROPBEAR_ECDSA
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10
846 b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	11 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	12 {
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	13 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	14 \|\| type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	15 \|\| type == DROPBEAR_SIGNKEY_ECDSA_NISTP521;
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	16 }
b298bb438625 refactor key generation, make it generate as required. Matt Johnston <matt@ucc.asn.au> parents: 801 diff changeset	17
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	18 enum signkey_type ecdsa_signkey_type(ecc_key * key) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	19 #ifdef DROPBEAR_ECC_256
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	20 if (key->dp == ecc_curve_nistp256.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	21 return DROPBEAR_SIGNKEY_ECDSA_NISTP256;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	22 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	23 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	24 #ifdef DROPBEAR_ECC_384
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	25 if (key->dp == ecc_curve_nistp384.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	26 return DROPBEAR_SIGNKEY_ECDSA_NISTP384;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	27 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	28 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	29 #ifdef DROPBEAR_ECC_521
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	30 if (key->dp == ecc_curve_nistp521.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	31 return DROPBEAR_SIGNKEY_ECDSA_NISTP521;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	32 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	33 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	34 return DROPBEAR_SIGNKEY_NONE;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	35 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	36
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 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	38 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	39 ecc_key *new_key = NULL;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 switch (bit_size) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 #ifdef DROPBEAR_ECC_256
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 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	43 dp = ecc_curve_nistp256.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 #ifdef DROPBEAR_ECC_384
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 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	48 dp = ecc_curve_nistp384.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 #ifdef DROPBEAR_ECC_521
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 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	53 dp = ecc_curve_nistp521.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 if (!dp) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 dropbear_exit("Key size %d isn't valid. Try "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 #ifdef DROPBEAR_ECC_256
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 "256 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 #ifdef DROPBEAR_ECC_384
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 "384 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 #ifdef DROPBEAR_ECC_521
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 "521 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 , bit_size);
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70
855 04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G. Matt Johnston <matt@ucc.asn.au> parents: 852 diff changeset	71 new_key = m_malloc(sizeof(*new_key));
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 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	73 dropbear_exit("ECC error");
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 return new_key;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	78 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	79 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	80 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	81 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	82 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	83 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	84
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	85 /* string "ecdsa-sha2-[identifier]" */
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	86 key_ident = buf_getstring(buf, &key_ident_len);
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	87 /* string "[identifier]" */
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	88 identifier = buf_getstring(buf, &identifier_len);
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	89
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	90 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	91 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	92 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	93 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	94 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	95 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	96 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	97 }
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	99 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	100 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	101 break;
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 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	104 if (!*curve) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	105 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	106 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	107 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	108
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	109 /* 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	110 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	111 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	112
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	113 out:
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	114 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	115 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	116 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	117 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	118 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	119 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	120 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	121 return new_key;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	124 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	125 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	126 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	127 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	128 if (!new_key) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	129 return NULL;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	132 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	133 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	134 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	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 return new_key;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	141 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	142 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	143 unsigned char key_ident[30];
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	144
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	145 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	146 snprintf((char*)key_ident, sizeof(key_ident), "ecdsa-sha2-%s", curve->name);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	147 buf_putstring(buf, key_ident, strlen(key_ident));
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	148 buf_putstring(buf, curve->name, strlen(curve->name));
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	149 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	150 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	151
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	152 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	153 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	154 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	155 }
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 void buf_put_ecdsa_sign(buffer buf, ecc_key key, buffer *data_buf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	158 /* 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	159 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	160 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	161 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	162 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	163 void e = NULL, p = NULL, s = NULL, r;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	164 unsigned char key_ident[30];
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	165 buffer *sigbuf = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	166
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	167 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	168 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	169
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	170 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	171 goto out;
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
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->init(&hs);
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->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	176 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	177
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	178 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	179 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	182 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	183 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	186 for (;;) {
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	187 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	188 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	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 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	192 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	193 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	194 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	195 /* try again */
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	196 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	197 continue;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	198 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	199 /* k = 1/k */
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.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	201 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	202 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	203 /* s = xr */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	204 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	205 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	206 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	207 /* s = e + xr */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	208 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	209 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	210 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	211 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	212 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	213 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	214 /* 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	215 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	216 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	217 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	218 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	219
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	220 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	221 break;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	222 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	223 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	224
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	225 snprintf((char*)key_ident, sizeof(key_ident), "ecdsa-sha2-%s", curve->name);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	226 buf_putstring(buf, key_ident, strlen(key_ident));
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	227 /* 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	228 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	229 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	230 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	231 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	232
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	233 err = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	234
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	235 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	236 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	237 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	238 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	239
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	240 if (sigbuf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	241 buf_free(sigbuf);
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	244 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	245 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	246 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	247 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	248
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	249 /* returns values in s and r
c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	250 returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	251 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	252 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	253 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	254 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	255 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	256
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	257 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	258 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	259 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	260 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	261 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	262 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	263 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	264 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	265 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	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 ret = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	269
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	270 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	271 return ret;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	272 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	273
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	274
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	275 int buf_ecdsa_verify(buffer buf, ecc_key key, buffer *data_buf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	276 /* 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	277 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	278 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	279 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	280 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	281 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	282 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	283 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	284 void *mp = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	285
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	286 /* verify
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	287 *
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	288 * 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	289 * u1 = xw
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	290 * u2 = rw
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	291 * X = u1G + u2Q
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	292 * 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	293 * 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	294 */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	295
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	296 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	297 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	298
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	299 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	300 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	301 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	302 \|\| !mG
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	303 \|\| !mQ) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	304 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	305 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	306
852 7540c0822374 Various cleanups and fixes for warnings Matt Johnston <matt@ucc.asn.au> parents: 846 diff changeset	307 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	308 goto out;
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
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->init(&hs);
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->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	313 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	314
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	315 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	316 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	319 /* get the order */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	320 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	321 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	324 /* get the modulus */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	325 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	326 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	329 /* check for zero */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	330 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	331 \|\| 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	332 \|\| 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	333 \|\| 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	334 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	337 /* 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	338 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	339 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	342 /* u1 = ew */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	343 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	344 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	347 /* u2 = rw */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	348 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	349 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	352 /* 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	353 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	354 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	355 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	356 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	357 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	358 }
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.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	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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	363 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	364 \|\| 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	365 \|\| 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	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 /* 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	370 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	371 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	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 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	375 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	378 /* 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	379 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	380 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	383 /* add them */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	384 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	385 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	386 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	387
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	388 /* reduce */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	389 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	390 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	391 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	392 } else {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	393 /* use Shamir's trick to compute u1mG + u2mQ using half of the doubles */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	394 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	395 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	399 /* 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	400 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	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 /* does v == r */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	405 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	406 ret = DROPBEAR_SUCCESS;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	409 out:
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(mG);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	411 ltc_ecc_del_point(mQ);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	412 mp_clear_multi(r, s, v, w, u1, u2, p, e, m, NULL);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	413 if (mp != NULL) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	414 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	415 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	416 return ret;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	419
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	420
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 855 diff changeset	421 #endif /* DROPBEAR_ECDSA */

Mercurial > dropbear

annotate ecdsa.c @ 1060:4c733310c21d nocircbuffer