dropbear: ecdsa.c annotate

annotate ecdsa.c @ 840:5128e525c8fa ecc

Default to some larger key sizes

author	Matt Johnston <matt@ucc.asn.au>
date	Thu, 31 Oct 2013 22:49:15 +0800
parents	7dcb46da72d9
children	b298bb438625

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
795 7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	11 enum signkey_type ecdsa_signkey_type(ecc_key * key) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	12 #ifdef DROPBEAR_ECC_256
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	13 if (key->dp == ecc_curve_nistp256.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	14 return DROPBEAR_SIGNKEY_ECDSA_NISTP256;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	15 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	16 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	17 #ifdef DROPBEAR_ECC_384
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	18 if (key->dp == ecc_curve_nistp384.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	19 return DROPBEAR_SIGNKEY_ECDSA_NISTP384;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	20 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	21 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	22 #ifdef DROPBEAR_ECC_521
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	23 if (key->dp == ecc_curve_nistp521.dp) {
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	24 return DROPBEAR_SIGNKEY_ECDSA_NISTP521;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	25 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	26 #endif
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	27 return DROPBEAR_SIGNKEY_NONE;
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	28 }
7f604f9b3756 ecdsa is working Matt Johnston <matt@ucc.asn.au> parents: 794 diff changeset	29
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 ecc_key *gen_ecdsa_priv_key(unsigned int bit_size) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 const ltc_ecc_set_type *dp = NULL; // curve domain parameters
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 switch (bit_size) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 #ifdef DROPBEAR_ECC_256
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 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	35 dp = ecc_curve_nistp256.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 #ifdef DROPBEAR_ECC_384
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 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	40 dp = ecc_curve_nistp384.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 #ifdef DROPBEAR_ECC_521
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 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	45 dp = ecc_curve_nistp521.dp;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 break;
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 if (!dp) {
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 dropbear_exit("Key size %d isn't valid. Try "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 #ifdef DROPBEAR_ECC_256
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 "256 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 #ifdef DROPBEAR_ECC_384
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 "384 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 #ifdef DROPBEAR_ECC_521
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 "521 "
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 #endif
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 , bit_size);
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 ecc_key new_key = m_malloc(sizeof(new_key));
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 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	65 dropbear_exit("ECC error");
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 return new_key;
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
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	70 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	71 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	72 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	73 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	74 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	75 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	76
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	77 // string "ecdsa-sha2-[identifier]"
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	78 key_ident = buf_getstring(buf, &key_ident_len);
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	79 // 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	80 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	81
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	82 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	83 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	84 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	85 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	86 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	87 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	88 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	89 }
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	91 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	92 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	93 break;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	94 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	95 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	96 if (!*curve) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	97 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	98 goto out;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	99 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	100
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	101 // string Q
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	102 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	103 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	104
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	105 out:
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	106 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	107 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	108 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	109 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	110 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	111 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	112 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	113 return new_key;
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 }
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	116 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	117 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	118 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	119 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	120 if (!new_key) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	121 return NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	122 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	123
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	124 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	125 ecc_free(new_key);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	126 return NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	127 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	128
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	129 return new_key;
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 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	133 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	134 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	135
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	136 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	137 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	138 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	139 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	140 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	141 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	142
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	143 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	144 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	145 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	146 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	147
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	148 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	149 /* 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	150 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	151 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	152 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	153 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	154 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	155 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	156 buffer *sigbuf = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	157
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	158 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	159 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	160
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	161 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	162 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	163 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	164
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	165 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	166 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	167 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	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_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	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 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	174 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	175 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	176
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	177 for (;;) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	178 ecc_key R_key; // ephemeral key
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	179 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	180 goto out;
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.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	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 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	186 // try again
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	187 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	188 continue;
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 /* k = 1/k */
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.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	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 /* s = xr */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	195 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	196 goto out;
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 /* s = e + xr */
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.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	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 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	203 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	204 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	205 /* 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	206 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	207 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	208 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	209 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	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.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	212 break;
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 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	215
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	216 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	217 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	218 // enough for nistp521
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	219 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	220 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	221 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	222 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	223
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	224 err = DROPBEAR_SUCCESS;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	225
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	226 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	227 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	228 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	229 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	230
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	231 if (sigbuf) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	232 buf_free(sigbuf);
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	235 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	236 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	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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	240 // returns values in s and r
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	241 // returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	242 static int buf_get_ecdsa_verify_params(buffer buf, struct dropbear_ecc_curve curve,
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	243 void r, void s) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	244 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	245 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	246 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	247
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	248 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	249 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	250 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	251 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	252 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	253 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	254 goto out;
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 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	257 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	258 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	259 ret = DROPBEAR_SUCCESS;
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 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	262 return ret;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	265
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	266 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	267 /* 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	268 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	269 hash_state hs;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	270 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	271 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	272 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	273 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	274 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	275 void *mp = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	276
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	277 /* verify
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	278 *
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	279 * 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	280 * u1 = xw
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	281 * u2 = rw
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	282 * X = u1G + u2Q
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	283 * 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	284 * 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	285 */
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 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	288 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	289
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	290 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	291 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	292 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	293 \|\| !mG
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	294 \|\| !mQ) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	295 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	296 }
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 if (buf_get_ecdsa_verify_params(buf, curve, r, s) != DROPBEAR_SUCCESS) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	299 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	300 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	301
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	302 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	303 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	304 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	305
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	306 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	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 /* get the order */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	311 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	312 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	315 /* get the modulus */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	316 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	317 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	320 /* check for zero */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	321 if (ltc_mp.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	322 \|\| 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	323 \|\| 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	324 \|\| 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	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 /* 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	329 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	330 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	331 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	332
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	333 /* u1 = ew */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	334 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	335 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	338 /* u2 = rw */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	339 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	340 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	341 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	342
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	343 /* 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	344 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	345 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	346 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	347 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	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 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	351 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	352 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	353
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	354 if (ltc_mp.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	355 \|\| 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	356 \|\| 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	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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	360 /* 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	361 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	362 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	363 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	364 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	365 if (ltc_mp.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	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 /* 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	370 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	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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	374 /* add them */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	375 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	376 goto out;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	379 /* reduce */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	380 if (ltc_mp.ecc_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	381 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	382 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	383 } else {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	384 /* 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	385 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	386 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	387 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	388 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	389
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	390 /* 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	391 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	392 goto out;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	393 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	394
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	395 /* does v == r */
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	396 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	397 ret = DROPBEAR_SUCCESS;
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
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	400 out:
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	401 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	402 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	403 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	404 if (mp != NULL) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	405 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	406 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	407 return ret;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	408 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	409
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	410
766 d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	411
d1575fdc29a6 start on ecdsa keys Matt Johnston <matt@ucc.asn.au> parents: diff changeset	412 #endif // DROPBEAR_ECDSA

Mercurial > dropbear

annotate ecdsa.c @ 840:5128e525c8fa ecc