99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* $OpenBSD: kexgex.c,v 1.27 2006/08/03 03:34:42 deraadt Exp $ */
|
|
/*
|
|
* Copyright (c) 2000 Niels Provos. All rights reserved.
|
|
* Copyright (c) 2001 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <openssl/evp.h>
|
|
#include <signal.h>
|
|
|
|
#include "buffer.h"
|
|
#include "key.h"
|
|
#include "cipher.h"
|
|
#include "kex.h"
|
|
#include "ssh2.h"
|
|
|
|
void
|
|
kexgex_hash(
|
|
const EVP_MD *evp_md,
|
|
char *client_version_string,
|
|
char *server_version_string,
|
|
char *ckexinit, int ckexinitlen,
|
|
char *skexinit, int skexinitlen,
|
|
u_char *serverhostkeyblob, int sbloblen,
|
|
int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
|
|
BIGNUM *client_dh_pub,
|
|
BIGNUM *server_dh_pub,
|
|
BIGNUM *shared_secret,
|
|
u_char **hash, u_int *hashlen)
|
|
{
|
|
Buffer b;
|
|
static u_char digest[EVP_MAX_MD_SIZE];
|
|
EVP_MD_CTX md;
|
|
|
|
buffer_init(&b);
|
|
buffer_put_cstring(&b, client_version_string);
|
|
buffer_put_cstring(&b, server_version_string);
|
|
|
|
/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
|
|
buffer_put_int(&b, ckexinitlen+1);
|
|
buffer_put_char(&b, SSH2_MSG_KEXINIT);
|
|
buffer_append(&b, ckexinit, ckexinitlen);
|
|
buffer_put_int(&b, skexinitlen+1);
|
|
buffer_put_char(&b, SSH2_MSG_KEXINIT);
|
|
buffer_append(&b, skexinit, skexinitlen);
|
|
|
|
buffer_put_string(&b, serverhostkeyblob, sbloblen);
|
|
if (min == -1 || max == -1)
|
|
buffer_put_int(&b, wantbits);
|
|
else {
|
|
buffer_put_int(&b, min);
|
|
buffer_put_int(&b, wantbits);
|
|
buffer_put_int(&b, max);
|
|
}
|
|
buffer_put_bignum2(&b, prime);
|
|
buffer_put_bignum2(&b, gen);
|
|
buffer_put_bignum2(&b, client_dh_pub);
|
|
buffer_put_bignum2(&b, server_dh_pub);
|
|
buffer_put_bignum2(&b, shared_secret);
|
|
|
|
#ifdef DEBUG_KEXDH
|
|
buffer_dump(&b);
|
|
#endif
|
|
|
|
EVP_DigestInit(&md, evp_md);
|
|
EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
|
|
EVP_DigestFinal(&md, digest, NULL);
|
|
|
|
buffer_free(&b);
|
|
*hash = digest;
|
|
*hashlen = EVP_MD_size(evp_md);
|
|
#ifdef DEBUG_KEXDH
|
|
dump_digest("hash", digest, *hashlen);
|
|
#endif
|
|
}
|