Mercurial > dropbear

annotate ecc.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 063c38ea622b
children 750ec4ec4cbe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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4 #include "dbutil.h"
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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5 #include "bignum.h"
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6
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
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diff changeset
7 #ifdef DROPBEAR_ECC
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8
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7540c0822374 Various cleanups and fixes for warnings
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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 = {
855
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12 32, /* .ltc_size */
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13 NULL, /* .dp */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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14 &sha256_desc, /* .hash_desc */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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15 "nistp256" /* .name */
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16 };
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17 #endif
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diff changeset
18 #ifdef DROPBEAR_ECC_384
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19 struct dropbear_ecc_curve ecc_curve_nistp384 = {
855
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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20 48, /* .ltc_size */
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21 NULL, /* .dp */
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22 &sha384_desc, /* .hash_desc */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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23 "nistp384" /* .name */
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24 };
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diff changeset
25 #endif
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230666086711 ecc key import function
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diff changeset
26 #ifdef DROPBEAR_ECC_521
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27 struct dropbear_ecc_curve ecc_curve_nistp521 = {
855
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28 66, /* .ltc_size */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
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29 NULL, /* .dp */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
Matt Johnston <matt@ucc.asn.au>
parents: 852
diff changeset
30 &sha512_desc, /* .hash_desc */
04ede40a529a - Some fixes for old compilers like tru64 v4 from Daniel Richard G.
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parents: 852
diff changeset
31 "nistp521" /* .name */
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32 };
bf9dc2d9c2b1 more bits on ecc branch
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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
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with
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48 void dropbear_ecc_fill_dp() {
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49 struct dropbear_ecc_curve **curve;
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7540c0822374 Various cleanups and fixes for warnings
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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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diff changeset
52 for (curve = dropbear_ecc_curves; *curve; curve++) {
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parents: 766
diff changeset
53 for (;dp->size > 0; dp++) {
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parents: 766
diff changeset
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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diff changeset
57 }
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58 }
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parents: 766
diff changeset
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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diff changeset
65 struct dropbear_ecc_curve* curve_for_dp(const ltc_ecc_set_type *dp) {
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diff changeset
66 struct dropbear_ecc_curve **curve = NULL;
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diff changeset
67 for (curve = dropbear_ecc_curves; *curve; curve++) {
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diff changeset
68 if ((*curve)->dp == dp) {
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diff changeset
69 break;
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70 }
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71 }
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parents: 768
diff changeset
72 assert(*curve);
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parents: 768
diff changeset
73 return *curve;
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parents: 768
diff changeset
74 }
70625eed40c9 A bit of work on ecdsa for host/auth keys
Matt Johnston <matt@ucc.asn.au>
parents: 768
diff changeset
75
767
e465ed10c51d Be safer with how we handle ltc_ecc_sets[] (particularly with
Matt Johnston <matt@ucc.asn.au>
parents: 766
diff changeset
76 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>
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diff changeset
77 ecc_key *key = m_malloc(sizeof(*key));
864
30ab30e46452 Fix some warnings
Matt Johnston <matt@ucc.asn.au>
parents: 857
diff changeset
78 m_mp_alloc_init_multi((mp_int**)&key->pubkey.x, (mp_int**)&key->pubkey.y,
30ab30e46452 Fix some warnings
Matt Johnston <matt@ucc.asn.au>
parents: 857
diff changeset
79 (mp_int**)&key->pubkey.z, (mp_int**)&key->k, NULL);
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
80 return key;
759
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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parents: 757
diff changeset
81 }
756
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parents: 755
diff changeset
82
857
c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 855
diff changeset
83 /* Copied from libtomcrypt ecc_import.c (version there is static), modified
c19acba28590 use oldstyle comments
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parents: 855
diff changeset
84 for different mp_int pointer without LTC_SOURCE */
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
85 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
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 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
88 int err;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
89
805
724c3e0c8734 Add m_mp_alloc_init_multi() helper
Matt Johnston <matt@ucc.asn.au>
parents: 793
diff changeset
90 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
91
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
92 /* 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
93 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
94 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
95
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 /* 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
97 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
98
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 /* 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
100 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
101 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
102 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
103
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 /* 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
105 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
106
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 /* 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
108 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
109 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
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_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
112 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
113 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
114 }
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 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
116 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
117 }
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
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()
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diff changeset
235 }
756
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236
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
237 prime = m_malloc(sizeof(*prime));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
238 m_mp_init(prime);
756
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239
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
240 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()
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241 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
242 }
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
243 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()
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diff changeset
244 goto done;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
245 }
756
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diff changeset
246
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
247 err = DROPBEAR_SUCCESS;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
248 done:
756
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diff changeset
249 if (err == DROPBEAR_SUCCESS) {
763
f744321ac048 ecdh works against OpenSSH
Matt Johnston <matt@ucc.asn.au>
parents: 762
diff changeset
250 shared_secret = m_malloc(sizeof(*shared_secret));
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
251 m_mp_init(shared_secret);
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
252 mp_copy(result->x, shared_secret);
756
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diff changeset
253 }
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parents: 755
diff changeset
254
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diff changeset
255 if (prime) {
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
256 mp_clear(prime);
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Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
257 m_free(prime);
756
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parents: 755
diff changeset
258 }
765
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
259 if (result)
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
260 {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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diff changeset
261 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
262 }
756
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parents: 755
diff changeset
263
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
264 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
265 dropbear_exit("ECC error");
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
266 }
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 return shared_secret;
756
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parents: 755
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