dropbear: ecc.c annotate

annotate ecc.c @ 805:724c3e0c8734 ecc

Add m_mp_alloc_init_multi() helper

author	Matt Johnston <matt@ucc.asn.au>
date	Thu, 23 May 2013 22:18:16 +0800
parents	70625eed40c9
children	7540c0822374

rev	line source
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	1 #include "includes.h"
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	2 #include "options.h"
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	3 #include "ecc.h"
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	4 #include "dbutil.h"
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	5 #include "bignum.h"
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	6
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 #ifdef DROPBEAR_ECC
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	9 // .dp members are filled out by dropbear_ecc_fill_dp() at startup
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	10 #ifdef DROPBEAR_ECC_256
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	11 struct dropbear_ecc_curve ecc_curve_nistp256 = {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	12 .ltc_size = 32,
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	13 .hash_desc = &sha256_desc,
762 a78a38e402d1 - Fix various hardcoded uses of SHA1 Matt Johnston <matt@ucc.asn.au> parents: 761 diff changeset	14 .name = "nistp256"
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	15 };
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	16 #endif
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	17 #ifdef DROPBEAR_ECC_384
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	18 struct dropbear_ecc_curve ecc_curve_nistp384 = {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	19 .ltc_size = 48,
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	20 .hash_desc = &sha384_desc,
762 a78a38e402d1 - Fix various hardcoded uses of SHA1 Matt Johnston <matt@ucc.asn.au> parents: 761 diff changeset	21 .name = "nistp384"
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	22 };
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	23 #endif
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	24 #ifdef DROPBEAR_ECC_521
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	25 struct dropbear_ecc_curve ecc_curve_nistp521 = {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	26 .ltc_size = 66,
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	27 .hash_desc = &sha512_desc,
762 a78a38e402d1 - Fix various hardcoded uses of SHA1 Matt Johnston <matt@ucc.asn.au> parents: 761 diff changeset	28 .name = "nistp521"
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	29 };
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	30 #endif
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	31
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	32 struct dropbear_ecc_curve *dropbear_ecc_curves[] = {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	33 #ifdef DROPBEAR_ECC_256
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	34 &ecc_curve_nistp256,
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	35 #endif
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	36 #ifdef DROPBEAR_ECC_384
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	37 &ecc_curve_nistp384,
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	38 #endif
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	39 #ifdef DROPBEAR_ECC_521
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	40 &ecc_curve_nistp521,
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	41 #endif
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	42 NULL
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	43 };
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	44
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	45 void dropbear_ecc_fill_dp() {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	46 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	47 // libtomcrypt guarantees they're ordered by size
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	48 const ltc_ecc_set_type *dp = ltc_ecc_sets;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	49 for (curve = dropbear_ecc_curves; *curve; curve++) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	50 for (;dp->size > 0; dp++) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	51 if (dp->size == (*curve)->ltc_size) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	52 (*curve)->dp = dp;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	53 break;
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	54 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	55 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	56 if (!(*curve)->dp) {
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	57 dropbear_exit("Missing ECC params %s", (*curve)->name);
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	58 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	59 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	60 }
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	61
793 70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	62 struct dropbear_ecc_curve* curve_for_dp(const ltc_ecc_set_type *dp) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	63 struct dropbear_ecc_curve **curve = NULL;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	64 for (curve = dropbear_ecc_curves; *curve; curve++) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	65 if ((*curve)->dp == dp) {
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	66 break;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	67 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	68 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	69 assert(*curve);
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	70 return *curve;
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	71 }
70625eed40c9 A bit of work on ecdsa for host/auth keys Matt Johnston <matt@ucc.asn.au> parents: 768 diff changeset	72
767 e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with Matt Johnston <matt@ucc.asn.au> parents: 766 diff changeset	73 ecc_key * new_ecc_key(void) {
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	74 ecc_key key = m_malloc(sizeof(key));
805 724c3e0c8734 Add m_mp_alloc_init_multi() helper Matt Johnston <matt@ucc.asn.au> parents: 793 diff changeset	75 m_mp_alloc_init_multi(&key->pubkey.x, &key->pubkey.y,
724c3e0c8734 Add m_mp_alloc_init_multi() helper Matt Johnston <matt@ucc.asn.au> parents: 793 diff changeset	76 &key->pubkey.z, &key->k, NULL);
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	77 return key;
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	78 }
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	79
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	80 // Copied from libtomcrypt ecc_import.c (version there is static), modified
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	81 // for different mp_int pointer without LTC_SOURCE
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	82 static int ecc_is_point(ecc_key *key)
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	83 {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	84 mp_int prime, b, t1, t2;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	85 int err;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	86
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	87 prime = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	88 b = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	89 t1 = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	90 t2 = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	91
805 724c3e0c8734 Add m_mp_alloc_init_multi() helper Matt Johnston <matt@ucc.asn.au> parents: 793 diff changeset	92 m_mp_alloc_init_multi(&prime, &b, &t1, &t2, NULL);
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	93
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	94 /* load prime and b */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	95 if ((err = mp_read_radix(prime, key->dp->prime, 16)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	96 if ((err = mp_read_radix(b, key->dp->B, 16)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	97
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	98 /* compute y^2 */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	99 if ((err = mp_sqr(key->pubkey.y, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	100
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	101 /* compute x^3 */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	102 if ((err = mp_sqr(key->pubkey.x, t2)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	103 if ((err = mp_mod(t2, prime, t2)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	104 if ((err = mp_mul(key->pubkey.x, t2, t2)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	105
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	106 /* compute y^2 - x^3 */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	107 if ((err = mp_sub(t1, t2, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	108
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	109 /* compute y^2 - x^3 + 3x */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	110 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	111 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	112 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	113 if ((err = mp_mod(t1, prime, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	114 while (mp_cmp_d(t1, 0) == LTC_MP_LT) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	115 if ((err = mp_add(t1, prime, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	116 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	117 while (mp_cmp(t1, prime) != LTC_MP_LT) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	118 if ((err = mp_sub(t1, prime, t1)) != CRYPT_OK) { goto error; }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	119 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	120
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	121 /* compare to b */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	122 if (mp_cmp(t1, b) != LTC_MP_EQ) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	123 err = CRYPT_INVALID_PACKET;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	124 } else {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	125 err = CRYPT_OK;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	126 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	127
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	128 error:
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	129 mp_clear_multi(prime, b, t1, t2, NULL);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	130 m_free(prime);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	131 m_free(b);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	132 m_free(t1);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	133 m_free(t2);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	134 return err;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	135 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	136
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	137 /* For the "ephemeral public key octet string" in ECDH (rfc5656 section 4) */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	138 void buf_put_ecc_raw_pubkey_string(buffer buf, ecc_key key) {
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	139 unsigned long len = key->dp->size*2 + 1;
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	140 buf_putint(buf, len);
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 int err = ecc_ansi_x963_export(key, buf_getwriteptr(buf, len), &len);
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 if (err != CRYPT_OK) {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143 dropbear_exit("ECC error");
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 buf_incrwritepos(buf, len);
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	148 /* For the "ephemeral public key octet string" in ECDH (rfc5656 section 4) */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	149 ecc_key * buf_get_ecc_raw_pubkey(buffer buf, const struct dropbear_ecc_curve curve) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	150 ecc_key *key = NULL;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	151 int ret = DROPBEAR_FAILURE;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	152 const unsigned int size = curve->dp->size;
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	153 unsigned char first;
6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	154
6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	155 TRACE(("enter buf_get_ecc_raw_pubkey"))
6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	156
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	157 buf_setpos(buf, 0);
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	158 first = buf_getbyte(buf);
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	159 if (first == 2 \|\| first == 3) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	160 dropbear_log(LOG_WARNING, "Dropbear doesn't support ECC point compression");
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	161 return NULL;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	162 }
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	163 if (first != 4 \|\| buf->len != 1+2*size) {
6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	164 TRACE(("leave, wrong size"))
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	165 return NULL;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	166 }
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	167
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	168 key = new_ecc_key();
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	169 key->dp = curve->dp;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	170
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	171 if (mp_read_unsigned_bin(key->pubkey.x, buf_getptr(buf, size), size) != MP_OKAY) {
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	172 TRACE(("failed to read x"))
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	173 goto out;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	174 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	175 buf_incrpos(buf, size);
759 76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, Matt Johnston <matt@ucc.asn.au> parents: 757 diff changeset	176
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	177 if (mp_read_unsigned_bin(key->pubkey.y, buf_getptr(buf, size), size) != MP_OKAY) {
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	178 TRACE(("failed to read y"))
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	179 goto out;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	180 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	181 buf_incrpos(buf, size);
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	182
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	183 mp_set(key->pubkey.z, 1);
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	184
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	185 if (ecc_is_point(key) != CRYPT_OK) {
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	186 TRACE(("failed, not a point"))
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	187 goto out;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	188 }
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	189
230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	190 // SEC1 3.2.3.1 Check that Q != 0
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	191 if (mp_cmp_d(key->pubkey.x, 0) == LTC_MP_EQ) {
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	192 TRACE(("failed, x == 0"))
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	193 goto out;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	194 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	195 if (mp_cmp_d(key->pubkey.y, 0) == LTC_MP_EQ) {
768 6e6ce39da2fc A bit of debugging output Matt Johnston <matt@ucc.asn.au> parents: 767 diff changeset	196 TRACE(("failed, y == 0"))
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	197 goto out;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	198 }
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	199
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	200 ret = DROPBEAR_SUCCESS;
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	201
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	202 out:
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	203 if (ret == DROPBEAR_FAILURE) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	204 if (key) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	205 ecc_free(key);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	206 m_free(key);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	207 key = NULL;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	208 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	209 }
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	210
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	211 return key;
757 230666086711 ecc key import function Matt Johnston <matt@ucc.asn.au> parents: 756 diff changeset	212
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	215 // a modified version of libtomcrypt's "ecc_shared_secret" to output
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	216 // a mp_int instead.
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	217 mp_int * dropbear_ecc_shared_secret(ecc_key public_key, ecc_key private_key)
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	218 {
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	219 ecc_point *result = NULL;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	220 mp_int prime = NULL, shared_secret = NULL;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	221 int err = DROPBEAR_FAILURE;
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	222
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	223 /* type valid? */
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	224 if (private_key->type != PK_PRIVATE) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	225 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	226 }
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	227
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	228 if (private_key->dp != public_key->dp) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	229 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	230 }
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	231
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	232 /* make new point */
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	233 result = ltc_ecc_new_point();
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	234 if (result == NULL) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	235 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	236 }
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	237
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	238 prime = m_malloc(sizeof(*prime));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	239 m_mp_init(prime);
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	240
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	241 if (mp_read_radix(prime, (char *)private_key->dp->prime, 16) != CRYPT_OK) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	242 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	243 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	244 if (ltc_mp.ecc_ptmul(private_key->k, &public_key->pubkey, result, prime, 1) != CRYPT_OK) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	245 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	246 }
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	247
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	248 err = DROPBEAR_SUCCESS;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	249 done:
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	250 if (err == DROPBEAR_SUCCESS) {
763 f744321ac048 ecdh works against OpenSSH Matt Johnston <matt@ucc.asn.au> parents: 762 diff changeset	251 shared_secret = m_malloc(sizeof(*shared_secret));
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	252 m_mp_init(shared_secret);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	253 mp_copy(result->x, shared_secret);
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	254 }
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	255
bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	256 if (prime) {
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	257 mp_clear(prime);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	258 m_free(prime);
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	259 }
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	260 if (result)
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	261 {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	262 ltc_ecc_del_point(result);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	263 }
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	264
765 5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	265 if (err == DROPBEAR_FAILURE) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	266 dropbear_exit("ECC error");
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	267 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() Matt Johnston <matt@ucc.asn.au> parents: 763 diff changeset	268 return shared_secret;
756 bf9dc2d9c2b1 more bits on ecc branch Matt Johnston <matt@ucc.asn.au> parents: 755 diff changeset	269 }
755 b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	270
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc Matt Johnston <matt@ucc.asn.au> parents: diff changeset	271 #endif

Mercurial > dropbear

annotate ecc.c @ 805:724c3e0c8734 ecc