1/*
2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * 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 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36/**
37 * Generate subkey, from keyblock
38 *
39 * @param context kerberos context
40 * @param key session key
41 * @param etype encryption type of subkey, if ETYPE_NULL, use key's enctype
42 * @param subkey returned new, free with krb5_free_keyblock().
43 *
44 * @return 0 on success or a Kerberos 5 error code
45 *
46* @ingroup krb5_crypto
47 */
48
49KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
50krb5_generate_subkey_extended(krb5_context context,
51			      const krb5_keyblock *key,
52			      krb5_enctype etype,
53			      krb5_keyblock **subkey)
54{
55    krb5_error_code ret;
56
57    ALLOC(*subkey, 1);
58    if (*subkey == NULL) {
59	krb5_set_error_message(context, ENOMEM,N_("malloc: out of memory", ""));
60	return ENOMEM;
61    }
62
63    if (etype == ETYPE_NULL)
64	etype = key->keytype; /* use session key etype */
65
66    /* XXX should we use the session key as input to the RF? */
67    ret = krb5_generate_random_keyblock(context, etype, *subkey);
68    if (ret != 0) {
69	free(*subkey);
70	*subkey = NULL;
71    }
72
73    return ret;
74}
75
76