annotate ecc.c @ 1073:88043f9d40bd

Fix when iov queue is large
author Matt Johnston <matt@ucc.asn.au>
date Fri, 20 Mar 2015 23:33:45 +0800
parents 063c38ea622b
children 750ec4ec4cbe
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1 #include "includes.h"
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2 #include "options.h"
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3 #include "ecc.h"
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4 #include "dbutil.h"
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5 #include "bignum.h"
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6
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7 #ifdef DROPBEAR_ECC
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8
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9 /* .dp members are filled out by dropbear_ecc_fill_dp() at startup */
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10 #ifdef DROPBEAR_ECC_256
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11 struct dropbear_ecc_curve ecc_curve_nistp256 = {
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12 32, /* .ltc_size */
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13 NULL, /* .dp */
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14 &sha256_desc, /* .hash_desc */
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15 "nistp256" /* .name */
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16 };
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17 #endif
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18 #ifdef DROPBEAR_ECC_384
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19 struct dropbear_ecc_curve ecc_curve_nistp384 = {
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20 48, /* .ltc_size */
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21 NULL, /* .dp */
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22 &sha384_desc, /* .hash_desc */
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23 "nistp384" /* .name */
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24 };
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25 #endif
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26 #ifdef DROPBEAR_ECC_521
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27 struct dropbear_ecc_curve ecc_curve_nistp521 = {
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28 66, /* .ltc_size */
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29 NULL, /* .dp */
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30 &sha512_desc, /* .hash_desc */
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31 "nistp521" /* .name */
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32 };
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33 #endif
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34
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35 struct dropbear_ecc_curve *dropbear_ecc_curves[] = {
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36 #ifdef DROPBEAR_ECC_256
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37 &ecc_curve_nistp256,
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38 #endif
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39 #ifdef DROPBEAR_ECC_384
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40 &ecc_curve_nistp384,
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41 #endif
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42 #ifdef DROPBEAR_ECC_521
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43 &ecc_curve_nistp521,
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44 #endif
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45 NULL
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46 };
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47
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48 void dropbear_ecc_fill_dp() {
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49 struct dropbear_ecc_curve **curve;
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50 /* libtomcrypt guarantees they're ordered by size */
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51 const ltc_ecc_set_type *dp = ltc_ecc_sets;
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52 for (curve = dropbear_ecc_curves; *curve; curve++) {
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53 for (;dp->size > 0; dp++) {
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54 if (dp->size == (*curve)->ltc_size) {
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55 (*curve)->dp = dp;
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56 break;
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57 }
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58 }
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59 if (!(*curve)->dp) {
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60 dropbear_exit("Missing ECC params %s", (*curve)->name);
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61 }
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62 }
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63 }
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64
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65 struct dropbear_ecc_curve* curve_for_dp(const ltc_ecc_set_type *dp) {
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66 struct dropbear_ecc_curve **curve = NULL;
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67 for (curve = dropbear_ecc_curves; *curve; curve++) {
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68 if ((*curve)->dp == dp) {
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69 break;
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70 }
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71 }
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72 assert(*curve);
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73 return *curve;
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74 }
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75
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76 ecc_key * new_ecc_key(void) {
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77 ecc_key *key = m_malloc(sizeof(*key));
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78 m_mp_alloc_init_multi((mp_int**)&key->pubkey.x, (mp_int**)&key->pubkey.y,
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79 (mp_int**)&key->pubkey.z, (mp_int**)&key->k, NULL);
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80 return key;
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81 }
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82
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83 /* Copied from libtomcrypt ecc_import.c (version there is static), modified
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84 for different mp_int pointer without LTC_SOURCE */
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85 static int ecc_is_point(ecc_key *key)
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86 {
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87 mp_int *prime, *b, *t1, *t2;
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88 int err;
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89
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724c3e0c8734 Add m_mp_alloc_init_multi() helper
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90 m_mp_alloc_init_multi(&prime, &b, &t1, &t2, NULL);
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91
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92 /* load prime and b */
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diff changeset
93 if ((err = mp_read_radix(prime, key->dp->prime, 16)) != CRYPT_OK) { goto error; }
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diff changeset
94 if ((err = mp_read_radix(b, key->dp->B, 16)) != CRYPT_OK) { goto error; }
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95
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diff changeset
96 /* compute y^2 */
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diff changeset
97 if ((err = mp_sqr(key->pubkey.y, t1)) != CRYPT_OK) { goto error; }
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98
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diff changeset
99 /* compute x^3 */
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diff changeset
100 if ((err = mp_sqr(key->pubkey.x, t2)) != CRYPT_OK) { goto error; }
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101 if ((err = mp_mod(t2, prime, t2)) != CRYPT_OK) { goto error; }
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102 if ((err = mp_mul(key->pubkey.x, t2, t2)) != CRYPT_OK) { goto error; }
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103
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diff changeset
104 /* compute y^2 - x^3 */
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diff changeset
105 if ((err = mp_sub(t1, t2, t1)) != CRYPT_OK) { goto error; }
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diff changeset
106
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diff changeset
107 /* compute y^2 - x^3 + 3x */
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diff changeset
108 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; }
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diff changeset
109 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; }
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110 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; }
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diff changeset
111 if ((err = mp_mod(t1, prime, t1)) != CRYPT_OK) { goto error; }
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112 while (mp_cmp_d(t1, 0) == LTC_MP_LT) {
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diff changeset
113 if ((err = mp_add(t1, prime, t1)) != CRYPT_OK) { goto error; }
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diff changeset
114 }
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diff changeset
115 while (mp_cmp(t1, prime) != LTC_MP_LT) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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116 if ((err = mp_sub(t1, prime, t1)) != CRYPT_OK) { goto error; }
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117 }
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118
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 /* 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
120 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
121 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
122 } 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
123 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
124 }
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
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 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
127 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
128 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
129 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
130 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
131 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
132 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
133 }
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
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 /* 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
136 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
137 unsigned long len = key->dp->size*2 + 1;
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
138 int err;
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 buf_putint(buf, len);
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
140 err = ecc_ansi_x963_export(key, buf_getwriteptr(buf, len), &len);
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 if (err != CRYPT_OK) {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 dropbear_exit("ECC error");
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
144 buf_incrwritepos(buf, len);
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146
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
147 /* 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
148 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
149 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
150 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
151 const unsigned int size = curve->dp->size;
768
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
152 unsigned char first;
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
153
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
154 TRACE(("enter buf_get_ecc_raw_pubkey"))
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
155
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
156 buf_setpos(buf, 0);
768
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
157 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
158 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
159 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
160 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
161 }
768
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
162 if (first != 4 || buf->len != 1+2*size) {
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
163 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
164 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
165 }
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
166
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
167 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
168 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
169
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 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
171 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
172 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
173 }
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 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
175
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
176 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
177 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
178 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
179 }
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 buf_incrpos(buf, size);
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
181
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
182 mp_set(key->pubkey.z, 1);
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
183
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
184 if (ecc_is_point(key) != CRYPT_OK) {
768
6e6ce39da2fc A bit of debugging output
Matt Johnston <matt@ucc.asn.au>
parents: 767
diff changeset
185 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
186 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
187 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
188
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
189 /* 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
190 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
191 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
192 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
193 }
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 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
195 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
196 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
197 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
198
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
199 ret = DROPBEAR_SUCCESS;
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
200
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
201 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
202 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
203 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
204 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
205 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
206 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
207 }
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 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
209
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
210 return key;
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
211
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
213
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
214 /* a modified version of libtomcrypt's "ecc_shared_secret" to output
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
215 a mp_int instead. */
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
216 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
217 {
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
218 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
219 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
220 int err = DROPBEAR_FAILURE;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
221
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
222 /* 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
223 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
224 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
225 }
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
226
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
227 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
228 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
229 }
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
230
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
231 /* 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
232 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
233 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
234 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
235 }
756
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236
765
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diff changeset
237 prime = m_malloc(sizeof(*prime));
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238 m_mp_init(prime);
756
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239
765
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240 if (mp_read_radix(prime, (char *)private_key->dp->prime, 16) != CRYPT_OK) {
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241 goto done;
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242 }
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diff changeset
243 if (ltc_mp.ecc_ptmul(private_key->k, &public_key->pubkey, result, prime, 1) != CRYPT_OK) {
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244 goto done;
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245 }
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246
765
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diff changeset
247 err = DROPBEAR_SUCCESS;
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248 done:
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249 if (err == DROPBEAR_SUCCESS) {
763
f744321ac048 ecdh works against OpenSSH
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diff changeset
250 shared_secret = m_malloc(sizeof(*shared_secret));
765
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251 m_mp_init(shared_secret);
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252 mp_copy(result->x, shared_secret);
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253 }
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254
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255 if (prime) {
765
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diff changeset
256 mp_clear(prime);
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diff changeset
257 m_free(prime);
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258 }
765
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diff changeset
259 if (result)
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diff changeset
260 {
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diff changeset
261 ltc_ecc_del_point(result);
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diff changeset
262 }
756
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diff changeset
263
765
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diff changeset
264 if (err == DROPBEAR_FAILURE) {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
265 dropbear_exit("ECC error");
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diff changeset
266 }
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diff changeset
267 return shared_secret;
756
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diff changeset
268 }
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
269
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 #endif