1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/crypto/krb/prf_des.c - RFC 3961 DES-based PRF */
3 /*
4 * Copyright (C) 2004, 2009 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 #include "crypto_int.h"
28
29 krb5_error_code
krb5int_des_prf(const struct krb5_keytypes * ktp,krb5_key key,const krb5_data * in,krb5_data * out)30 krb5int_des_prf(const struct krb5_keytypes *ktp, krb5_key key,
31 const krb5_data *in, krb5_data *out)
32 {
33 const struct krb5_hash_provider *hash = &krb5int_hash_md5;
34 krb5_crypto_iov iov;
35 krb5_error_code ret;
36
37 /* Compute a hash of the input, storing into the output buffer. */
38 iov.flags = KRB5_CRYPTO_TYPE_DATA;
39 iov.data = *in;
40 ret = hash->hash(&iov, 1, out);
41 if (ret != 0)
42 return ret;
43
44 /* Encrypt the hash in place. */
45 iov.data = *out;
46 return ktp->enc->encrypt(key, NULL, &iov, 1);
47 }
48