1 /* $OpenBSD: kexecdh.c,v 1.4 2013/04/19 01:06:50 djm Exp $ */
3 * Copyright (c) 2001 Markus Friedl. All rights reserved.
4 * Copyright (c) 2010 Damien Miller. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #ifdef OPENSSL_HAS_ECC
31 #include <sys/types.h>
36 #include <openssl/bn.h>
37 #include <openssl/evp.h>
38 #include <openssl/ec.h>
39 #include <openssl/ecdh.h>
51 const EC_GROUP *ec_group,
52 char *client_version_string,
53 char *server_version_string,
54 char *ckexinit, int ckexinitlen,
55 char *skexinit, int skexinitlen,
56 u_char *serverhostkeyblob, int sbloblen,
57 const EC_POINT *client_dh_pub,
58 const EC_POINT *server_dh_pub,
59 const BIGNUM *shared_secret,
60 u_char **hash, u_int *hashlen)
64 static u_char digest[EVP_MAX_MD_SIZE];
67 buffer_put_cstring(&b, client_version_string);
68 buffer_put_cstring(&b, server_version_string);
70 /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
71 buffer_put_int(&b, ckexinitlen+1);
72 buffer_put_char(&b, SSH2_MSG_KEXINIT);
73 buffer_append(&b, ckexinit, ckexinitlen);
74 buffer_put_int(&b, skexinitlen+1);
75 buffer_put_char(&b, SSH2_MSG_KEXINIT);
76 buffer_append(&b, skexinit, skexinitlen);
78 buffer_put_string(&b, serverhostkeyblob, sbloblen);
79 buffer_put_ecpoint(&b, ec_group, client_dh_pub);
80 buffer_put_ecpoint(&b, ec_group, server_dh_pub);
81 buffer_put_bignum2(&b, shared_secret);
86 EVP_DigestInit(&md, evp_md);
87 EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
88 EVP_DigestFinal(&md, digest, NULL);
93 dump_digest("hash", digest, EVP_MD_size(evp_md));
96 *hashlen = EVP_MD_size(evp_md);
99 #endif /* OPENSSL_HAS_ECC */