| | 1 | /* |
| | 2 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
| | 3 | * |
| | 4 | * Redistribution and use in source and binary forms, with or without |
| | 5 | * modification, are permitted provided that the following conditions |
| | 6 | * are met: |
| | 7 | * 1. Redistributions of source code must retain the above copyright |
| | 8 | * notice, this list of conditions and the following disclaimer. |
| | 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 10 | * notice, this list of conditions and the following disclaimer in the |
| | 11 | * documentation and/or other materials provided with the distribution. |
| | 12 | * |
| | 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| | 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| | 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| | 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| | 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| | 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| | 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| | 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| | 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| | 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| | 23 | */ |
| | 24 | |
| | 25 | #include "includes.h" |
| | 26 | RCSID("$OpenBSD: kexdh.c,v 1.20 2005/11/04 05:15:59 djm Exp $"); |
| | 27 | |
| | 28 | #include <openssl/evp.h> |
| | 29 | |
| | 30 | #include "buffer.h" |
| | 31 | #include "bufaux.h" |
| | 32 | #include "ssh2.h" |
| | 33 | #include "kex.h" |
| | 34 | |
| | 35 | void |
| | 36 | kex_dh_hash( |
| | 37 | char *client_version_string, |
| | 38 | char *server_version_string, |
| | 39 | char *ckexinit, int ckexinitlen, |
| | 40 | char *skexinit, int skexinitlen, |
| | 41 | u_char *serverhostkeyblob, int sbloblen, |
| | 42 | BIGNUM *client_dh_pub, |
| | 43 | BIGNUM *server_dh_pub, |
| | 44 | BIGNUM *shared_secret, |
| | 45 | u_char **hash, u_int *hashlen) |
| | 46 | { |
| | 47 | Buffer b; |
| | 48 | static u_char digest[EVP_MAX_MD_SIZE]; |
| | 49 | const EVP_MD *evp_md = EVP_sha1(); |
| | 50 | EVP_MD_CTX md; |
| | 51 | |
| | 52 | buffer_init(&b); |
| | 53 | buffer_put_cstring(&b, client_version_string); |
| | 54 | buffer_put_cstring(&b, server_version_string); |
| | 55 | |
| | 56 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ |
| | 57 | buffer_put_int(&b, ckexinitlen+1); |
| | 58 | buffer_put_char(&b, SSH2_MSG_KEXINIT); |
| | 59 | buffer_append(&b, ckexinit, ckexinitlen); |
| | 60 | buffer_put_int(&b, skexinitlen+1); |
| | 61 | buffer_put_char(&b, SSH2_MSG_KEXINIT); |
| | 62 | buffer_append(&b, skexinit, skexinitlen); |
| | 63 | |
| | 64 | buffer_put_string(&b, serverhostkeyblob, sbloblen); |
| | 65 | buffer_put_bignum2(&b, client_dh_pub); |
| | 66 | buffer_put_bignum2(&b, server_dh_pub); |
| | 67 | buffer_put_bignum2(&b, shared_secret); |
| | 68 | |
| | 69 | #ifdef DEBUG_KEX |
| | 70 | buffer_dump(&b); |
| | 71 | #endif |
| | 72 | EVP_DigestInit(&md, evp_md); |
| | 73 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); |
| | 74 | EVP_DigestFinal(&md, digest, NULL); |
| | 75 | |
| | 76 | buffer_free(&b); |
| | 77 | |
| | 78 | #ifdef DEBUG_KEX |
| | 79 | dump_digest("hash", digest, EVP_MD_size(evp_md)); |
| | 80 | #endif |
| | 81 | *hash = digest; |
| | 82 | *hashlen = EVP_MD_size(evp_md); |
| | 83 | } |
andersk / openssh.git / blame_incremental