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Annotation of src/usr.bin/ssh/kexgex.c, Revision 1.27

1.27    ! deraadt     1: /* $OpenBSD: kexgex.c,v 1.26 2006/03/25 13:17:02 djm Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2000 Niels Provos.  All rights reserved.
                      4:  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
                      5:  *
                      6:  * Redistribution and use in source and binary forms, with or without
                      7:  * modification, are permitted provided that the following conditions
                      8:  * are met:
                      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.
                     14:  *
                     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.
                     25:  */
                     26:
1.27    ! deraadt    27: #include <sys/types.h>
1.1       markus     28:
1.23      markus     29: #include <openssl/evp.h>
1.27    ! deraadt    30: #include <signal.h>
1.1       markus     31:
                     32: #include "buffer.h"
1.27    ! deraadt    33: #include "key.h"
        !            34: #include "cipher.h"
1.1       markus     35: #include "kex.h"
                     36: #include "ssh2.h"
                     37:
1.24      djm        38: void
1.1       markus     39: kexgex_hash(
1.24      djm        40:     const EVP_MD *evp_md,
1.1       markus     41:     char *client_version_string,
                     42:     char *server_version_string,
                     43:     char *ckexinit, int ckexinitlen,
                     44:     char *skexinit, int skexinitlen,
1.9       stevesk    45:     u_char *serverhostkeyblob, int sbloblen,
1.1       markus     46:     int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
                     47:     BIGNUM *client_dh_pub,
                     48:     BIGNUM *server_dh_pub,
1.24      djm        49:     BIGNUM *shared_secret,
                     50:     u_char **hash, u_int *hashlen)
1.1       markus     51: {
                     52:        Buffer b;
                     53:        static u_char digest[EVP_MAX_MD_SIZE];
                     54:        EVP_MD_CTX md;
                     55:
                     56:        buffer_init(&b);
1.6       markus     57:        buffer_put_cstring(&b, client_version_string);
                     58:        buffer_put_cstring(&b, server_version_string);
1.1       markus     59:
                     60:        /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
                     61:        buffer_put_int(&b, ckexinitlen+1);
                     62:        buffer_put_char(&b, SSH2_MSG_KEXINIT);
                     63:        buffer_append(&b, ckexinit, ckexinitlen);
                     64:        buffer_put_int(&b, skexinitlen+1);
                     65:        buffer_put_char(&b, SSH2_MSG_KEXINIT);
                     66:        buffer_append(&b, skexinit, skexinitlen);
                     67:
                     68:        buffer_put_string(&b, serverhostkeyblob, sbloblen);
1.5       markus     69:        if (min == -1 || max == -1)
1.1       markus     70:                buffer_put_int(&b, wantbits);
                     71:        else {
                     72:                buffer_put_int(&b, min);
                     73:                buffer_put_int(&b, wantbits);
                     74:                buffer_put_int(&b, max);
                     75:        }
                     76:        buffer_put_bignum2(&b, prime);
                     77:        buffer_put_bignum2(&b, gen);
                     78:        buffer_put_bignum2(&b, client_dh_pub);
                     79:        buffer_put_bignum2(&b, server_dh_pub);
                     80:        buffer_put_bignum2(&b, shared_secret);
                     81:
                     82: #ifdef DEBUG_KEXDH
                     83:        buffer_dump(&b);
                     84: #endif
1.24      djm        85:
1.1       markus     86:        EVP_DigestInit(&md, evp_md);
                     87:        EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
                     88:        EVP_DigestFinal(&md, digest, NULL);
                     89:
                     90:        buffer_free(&b);
1.24      djm        91:        *hash = digest;
                     92:        *hashlen = EVP_MD_size(evp_md);
1.1       markus     93: #ifdef DEBUG_KEXDH
1.24      djm        94:        dump_digest("hash", digest, *hashlen);
1.1       markus     95: #endif
                     96: }