1 /* $NetBSD: generate_subkey.c,v 1.1.1.1 2011/04/13 18:15:33 elric Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37
38 /**
39 * Generate subkey, from keyblock
40 *
41 * @param context kerberos context
42 * @param key session key
43 * @param etype encryption type of subkey, if ETYPE_NULL, use key's enctype
44 * @param subkey returned new, free with krb5_free_keyblock().
45 *
46 * @return 0 on success or a Kerberos 5 error code
47 *
48 * @ingroup krb5_crypto
49 */
50
51 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_generate_subkey_extended(krb5_context context,const krb5_keyblock * key,krb5_enctype etype,krb5_keyblock ** subkey)52 krb5_generate_subkey_extended(krb5_context context,
53 const krb5_keyblock *key,
54 krb5_enctype etype,
55 krb5_keyblock **subkey)
56 {
57 krb5_error_code ret;
58
59 ALLOC(*subkey, 1);
60 if (*subkey == NULL) {
61 krb5_set_error_message(context, ENOMEM,N_("malloc: out of memory", ""));
62 return ENOMEM;
63 }
64
65 if (etype == ETYPE_NULL)
66 etype = key->keytype; /* use session key etype */
67
68 /* XXX should we use the session key as input to the RF? */
69 ret = krb5_generate_random_keyblock(context, etype, *subkey);
70 if (ret != 0) {
71 free(*subkey);
72 *subkey = NULL;
73 }
74
75 return ret;
76 }
77
78