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Annotation of src/usr.bin/ssh/kexdh.c, Revision 1.19

1.1       markus      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"
1.19    ! markus     26: RCSID("$OpenBSD: kexdh.c,v 1.18 2002/03/18 17:50:31 provos Exp $");
1.1       markus     27:
1.19    ! markus     28: #include <openssl/evp.h>
1.1       markus     29:
                     30: #include "buffer.h"
                     31: #include "bufaux.h"
1.19    ! markus     32: #include "ssh2.h"
1.1       markus     33: #include "kex.h"
                     34:
1.19    ! markus     35: u_char *
1.1       markus     36: kex_dh_hash(
                     37:     char *client_version_string,
                     38:     char *server_version_string,
                     39:     char *ckexinit, int ckexinitlen,
                     40:     char *skexinit, int skexinitlen,
1.7       stevesk    41:     u_char *serverhostkeyblob, int sbloblen,
1.1       markus     42:     BIGNUM *client_dh_pub,
                     43:     BIGNUM *server_dh_pub,
                     44:     BIGNUM *shared_secret)
                     45: {
                     46:        Buffer b;
                     47:        static u_char digest[EVP_MAX_MD_SIZE];
1.17      markus     48:        const EVP_MD *evp_md = EVP_sha1();
1.1       markus     49:        EVP_MD_CTX md;
                     50:
                     51:        buffer_init(&b);
1.4       markus     52:        buffer_put_cstring(&b, client_version_string);
                     53:        buffer_put_cstring(&b, server_version_string);
1.1       markus     54:
                     55:        /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
                     56:        buffer_put_int(&b, ckexinitlen+1);
                     57:        buffer_put_char(&b, SSH2_MSG_KEXINIT);
                     58:        buffer_append(&b, ckexinit, ckexinitlen);
                     59:        buffer_put_int(&b, skexinitlen+1);
                     60:        buffer_put_char(&b, SSH2_MSG_KEXINIT);
                     61:        buffer_append(&b, skexinit, skexinitlen);
                     62:
                     63:        buffer_put_string(&b, serverhostkeyblob, sbloblen);
                     64:        buffer_put_bignum2(&b, client_dh_pub);
                     65:        buffer_put_bignum2(&b, server_dh_pub);
                     66:        buffer_put_bignum2(&b, shared_secret);
                     67:
                     68: #ifdef DEBUG_KEX
                     69:        buffer_dump(&b);
                     70: #endif
                     71:        EVP_DigestInit(&md, evp_md);
                     72:        EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
                     73:        EVP_DigestFinal(&md, digest, NULL);
                     74:
                     75:        buffer_free(&b);
                     76:
                     77: #ifdef DEBUG_KEX
1.13      markus     78:        dump_digest("hash", digest, EVP_MD_size(evp_md));
1.1       markus     79: #endif
                     80:        return digest;
                     81: }