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annotate ecc.c @ 765:5503e05ab3a4 ecc

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- Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string() - Reindent ecc.c properly
author Matt Johnston <matt@ucc.asn.au>
date Mon, 08 Apr 2013 23:56:31 +0800
parents f744321ac048
children d1575fdc29a6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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bf9dc2d9c2b1 more bits on ecc branch
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parents: 755
diff changeset
1 #include "includes.h"
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
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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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parents: 757
diff changeset
4 #include "dbutil.h"
76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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parents: 757
diff changeset
5 #include "bignum.h"
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parents: 755
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6
755
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 #ifdef DROPBEAR_ECC
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8
757
230666086711 ecc key import function
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parents: 756
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9 // TODO: use raw bytes for the dp rather than the hex strings in libtomcrypt's ecc.c
230666086711 ecc key import function
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10
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parents: 755
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11 #ifdef DROPBEAR_ECC_256
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parents: 761
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12 const struct dropbear_ecc_curve ecc_curve_nistp256 = {
757
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parents: 756
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13 .dp = &ltc_ecc_sets[0],
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76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
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parents: 757
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14 .hash_desc = &sha256_desc,
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
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15 .name = "nistp256"
756
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parents: 755
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16 };
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parents: 755
diff changeset
17 #endif
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
18 #ifdef DROPBEAR_ECC_384
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Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
19 const struct dropbear_ecc_curve ecc_curve_nistp384 = {
757
230666086711 ecc key import function
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parents: 756
diff changeset
20 .dp = &ltc_ecc_sets[1],
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
21 .hash_desc = &sha384_desc,
762
a78a38e402d1 - Fix various hardcoded uses of SHA1
Matt Johnston <matt@ucc.asn.au>
parents: 761
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22 .name = "nistp384"
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parents: 755
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23 };
bf9dc2d9c2b1 more bits on ecc branch
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parents: 755
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24 #endif
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parents: 756
diff changeset
25 #ifdef DROPBEAR_ECC_521
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26 const struct dropbear_ecc_curve ecc_curve_nistp521 = {
757
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parents: 756
diff changeset
27 .dp = &ltc_ecc_sets[2],
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76fba0856749 More changes for KEX and ECDH. Set up hash descriptors, make ECC code work,
Matt Johnston <matt@ucc.asn.au>
parents: 757
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28 .hash_desc = &sha512_desc,
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a78a38e402d1 - Fix various hardcoded uses of SHA1
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parents: 761
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29 .name = "nistp521"
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parents: 755
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30 };
bf9dc2d9c2b1 more bits on ecc branch
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parents: 755
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31 #endif
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32
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Matt Johnston <matt@ucc.asn.au>
parents: 757
diff changeset
33 static 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
34 ecc_key *key = m_malloc(sizeof(*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
35 key->pubkey.x = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
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36 key->pubkey.y = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
37 key->pubkey.z = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
38 key->k = 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
39 m_mp_init_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, 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
40 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
41 }
756
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parents: 755
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42
765
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Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
43 // 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
44 // 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
45 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
46 {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
47 mp_int *prime, *b, *t1, *t2;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
48 int err;
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
49
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
50 prime = m_malloc(sizeof(mp_int));
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
51 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
52 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
53 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
54
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
55 m_mp_init_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
56
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
57 /* 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
58 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
59 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
60
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
61 /* 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
62 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
63
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
64 /* 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
65 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
66 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
67 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()
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parents: 763
diff changeset
68
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
69 /* compute y^2 - x^3 */
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
70 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
71
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
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parents: 763
diff changeset
72 /* 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
73 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
74 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
75 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
76 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
77 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
78 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
79 }
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 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
81 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
82 }
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 /* 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
85 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
86 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
87 } 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
88 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
89 }
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
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 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
92 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
93 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
94 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
95 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
96 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
97 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
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
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 /* 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
101 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
102 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
103 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
104 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
105 if (err != CRYPT_OK) {
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 dropbear_exit("ECC error");
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 buf_incrwritepos(buf, len);
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110
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
111 /* 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
112 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
113 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
114 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
115 const unsigned int size = curve->dp->size;
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 buf_setpos(buf, 0);
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 unsigned int len = buf->len;
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 unsigned char first = buf_getbyte(buf);
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 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
120 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
121 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
122 }
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 if (first != 4 || len != 1+2*size) {
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 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
125 }
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
126
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
127 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
128 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
129
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 if (mp_read_unsigned_bin(key->pubkey.x, buf_getptr(buf, size), size) != MP_OKAY) {
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 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
132 }
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 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
134
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
135 if (mp_read_unsigned_bin(key->pubkey.y, buf_getptr(buf, size), size) != MP_OKAY) {
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 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
137 }
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 buf_incrpos(buf, size);
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
139
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
140 mp_set(key->pubkey.z, 1);
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
141
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
142 if (ecc_is_point(key) != 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
143 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
144 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
145
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
146 // 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
147 if (mp_cmp_d(key->pubkey.x, 0) == 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
148 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
149 }
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 if (mp_cmp_d(key->pubkey.y, 0) == 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
151 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
152 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
153
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
154 ret = DROPBEAR_SUCCESS;
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
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 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
157 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
158 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
159 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
160 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
161 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
162 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
163 }
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
164
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 key;
757
230666086711 ecc key import function
Matt Johnston <matt@ucc.asn.au>
parents: 756
diff changeset
166
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
167 }
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
168
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
169 // 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
170 // a mp_int instead.
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
171 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
172 {
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 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
174 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
175 int err = DROPBEAR_FAILURE;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
176
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
177 /* 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
178 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
179 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
180 }
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
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 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
183 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
184 }
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
185
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
186 /* 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
187 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
188 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
189 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
190 }
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
191
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 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
193 m_mp_init(prime);
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
194
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
195 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
196 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
197 }
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 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
199 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
200 }
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
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 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
203 done:
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
204 if (err == DROPBEAR_SUCCESS) {
763
f744321ac048 ecdh works against OpenSSH
Matt Johnston <matt@ucc.asn.au>
parents: 762
diff changeset
205 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
206 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
207 mp_copy(result->x, shared_secret);
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
208 }
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
209
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
210 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
211 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
212 m_free(prime);
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
213 }
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
214 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
215 {
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
216 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
217 }
756
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 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
220 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
221 }
5503e05ab3a4 - Rename buf_put_ecc_pubkey_string() to buf_put_ecc_raw_pubkey_string()
Matt Johnston <matt@ucc.asn.au>
parents: 763
diff changeset
222 return shared_secret;
756
bf9dc2d9c2b1 more bits on ecc branch
Matt Johnston <matt@ucc.asn.au>
parents: 755
diff changeset
223 }
755
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224
b07eb3dc23ec refactor kexdh code a bit, start working on ecdh etc
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 #endif