1 /*
2 * lib/krb5/krb/gen_subkey.c
3 *
4 * Copyright 1991, 2002 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 *
26 *
27 * Routine to automatically generate a subsession key based on an input key.
28 */
29
30 #include "k5-int.h"
31
32 /*ARGSUSED*/
33 krb5_error_code
krb5_generate_subkey(krb5_context context,const krb5_keyblock * key,krb5_keyblock ** subkey)34 krb5_generate_subkey(krb5_context context, const krb5_keyblock *key, krb5_keyblock **subkey)
35 {
36 krb5_error_code retval;
37
38 #if 0
39 /*
40 * Solaris Kerberos: Don't bother with this PRNG stuff,
41 * we have /dev/random and PKCS#11 to handle Random Numbers.
42 */
43
44 krb5_data seed;
45
46 seed.length = key->length;
47 seed.data = key->contents;
48 if ((retval = krb5_c_random_add_entropy(context, KRB5_C_RANDSOURCE_TRUSTEDPARTY, &seed)))
49 return(retval);
50 #endif /* 0 */
51
52 if ((*subkey = (krb5_keyblock *) malloc(sizeof(krb5_keyblock))) == NULL)
53 return(ENOMEM);
54
55 /* Solaris Kerberos */
56 (void) memset(*subkey, 0, sizeof(krb5_keyblock));
57
58 if ((retval = krb5_c_make_random_key(context, key->enctype, *subkey))) {
59 krb5_xfree(*subkey);
60 return(retval);
61 }
62
63 return(0);
64 }
65