1/*
2 * Copyright (c) 1997 - 2008 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
36int _krb5_AES_string_to_default_iterator = 4096;
37
38static krb5_error_code
39AES_string_to_key(krb5_context context,
40		  krb5_enctype enctype,
41		  krb5_data password,
42		  krb5_salt salt,
43		  krb5_data opaque,
44		  krb5_keyblock *key)
45{
46    krb5_error_code ret;
47    uint32_t iter;
48    struct _krb5_encryption_type *et;
49    struct _krb5_key_data kd;
50
51    if (opaque.length == 0)
52	iter = _krb5_AES_string_to_default_iterator;
53    else if (opaque.length == 4) {
54	unsigned long v;
55	_krb5_get_int(opaque.data, &v, 4);
56	iter = ((uint32_t)v);
57    } else
58	return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
59
60    et = _krb5_find_enctype(enctype);
61    if (et == NULL)
62	return KRB5_PROG_KEYTYPE_NOSUPP;
63
64    kd.schedule = NULL;
65    ALLOC(kd.key, 1);
66    if(kd.key == NULL) {
67	krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
68	return ENOMEM;
69    }
70    kd.key->keytype = enctype;
71    ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
72    if (ret) {
73	krb5_set_error_message (context, ret, N_("malloc: out of memory", ""));
74	return ret;
75    }
76
77    ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length,
78				 salt.saltvalue.data, salt.saltvalue.length,
79				 iter,
80				 et->keytype->size, kd.key->keyvalue.data);
81    if (ret != 1) {
82	_krb5_free_key_data(context, &kd, et);
83	krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
84			       "Error calculating s2k");
85	return KRB5_PROG_KEYTYPE_NOSUPP;
86    }
87
88    ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
89    if (ret == 0)
90	ret = krb5_copy_keyblock_contents(context, kd.key, key);
91    _krb5_free_key_data(context, &kd, et);
92
93    return ret;
94}
95
96struct salt_type _krb5_AES_salt[] = {
97    {
98	KRB5_PW_SALT,
99	"pw-salt",
100	AES_string_to_key
101    },
102    { 0 }
103};
104