1/*	$NetBSD: salt-aes-sha1.c,v 1.2 2017/01/28 21:31:49 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997 - 2008 Kungliga Tekniska H��gskolan
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
38int _krb5_AES_SHA1_string_to_default_iterator = 4096;
39
40static krb5_error_code
41AES_SHA1_string_to_key(krb5_context context,
42		       krb5_enctype enctype,
43		       krb5_data password,
44		       krb5_salt salt,
45		       krb5_data opaque,
46		       krb5_keyblock *key)
47{
48    krb5_error_code ret;
49    uint32_t iter;
50    struct _krb5_encryption_type *et;
51    struct _krb5_key_data kd;
52
53    if (opaque.length == 0)
54	iter = _krb5_AES_SHA1_string_to_default_iterator;
55    else if (opaque.length == 4) {
56	unsigned long v;
57	_krb5_get_int(opaque.data, &v, 4);
58	iter = ((uint32_t)v);
59    } else
60	return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
61
62    et = _krb5_find_enctype(enctype);
63    if (et == NULL)
64	return KRB5_PROG_KEYTYPE_NOSUPP;
65
66    kd.schedule = NULL;
67    ALLOC(kd.key, 1);
68    if (kd.key == NULL)
69	return krb5_enomem(context);
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(password.data, password.length,
78			    salt.saltvalue.data, salt.saltvalue.length,
79			    iter,
80			    EVP_sha1(),
81			    et->keytype->size, kd.key->keyvalue.data);
82    if (ret != 1) {
83	_krb5_free_key_data(context, &kd, et);
84	krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
85			       "Error calculating s2k");
86	return KRB5_PROG_KEYTYPE_NOSUPP;
87    }
88
89    ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
90    if (ret == 0)
91	ret = krb5_copy_keyblock_contents(context, kd.key, key);
92    _krb5_free_key_data(context, &kd, et);
93
94    return ret;
95}
96
97struct salt_type _krb5_AES_SHA1_salt[] = {
98    {
99	KRB5_PW_SALT,
100	"pw-salt",
101	AES_SHA1_string_to_key
102    },
103    { 0, NULL, NULL }
104};
105