salt-arcfour.c revision 1.1.1.2 
1/*	$NetBSD: salt-arcfour.c,v 1.1.1.2 2014/04/24 12:45:51 pettai 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
38static krb5_error_code
39ARCFOUR_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    uint16_t *s = NULL;
48    size_t len = 0, i;
49    EVP_MD_CTX *m;
50
51    m = EVP_MD_CTX_create();
52    if (m == NULL) {
53	ret = ENOMEM;
54	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
55	goto out;
56    }
57
58    EVP_DigestInit_ex(m, EVP_md4(), NULL);
59
60    ret = wind_utf8ucs2_length(password.data, &len);
61    if (ret) {
62	krb5_set_error_message (context, ret,
63				N_("Password not an UCS2 string", ""));
64	goto out;
65    }
66
67    s = malloc (len * sizeof(s[0]));
68    if (len != 0 && s == NULL) {
69	krb5_set_error_message (context, ENOMEM,
70				N_("malloc: out of memory", ""));
71	ret = ENOMEM;
72	goto out;
73    }
74
75    ret = wind_utf8ucs2(password.data, s, &len);
76    if (ret) {
77	krb5_set_error_message (context, ret,
78				N_("Password not an UCS2 string", ""));
79	goto out;
80    }
81
82    /* LE encoding */
83    for (i = 0; i < len; i++) {
84	unsigned char p;
85	p = (s[i] & 0xff);
86	EVP_DigestUpdate (m, &p, 1);
87	p = (s[i] >> 8) & 0xff;
88	EVP_DigestUpdate (m, &p, 1);
89    }
90
91    key->keytype = enctype;
92    ret = krb5_data_alloc (&key->keyvalue, 16);
93    if (ret) {
94	krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
95	goto out;
96    }
97    EVP_DigestFinal_ex (m, key->keyvalue.data, NULL);
98
99 out:
100    EVP_MD_CTX_destroy(m);
101    if (s)
102	memset (s, 0, len);
103    free (s);
104    return ret;
105}
106
107struct salt_type _krb5_arcfour_salt[] = {
108    {
109	KRB5_PW_SALT,
110	"pw-salt",
111	ARCFOUR_string_to_key
112    },
113    { 0 }
114};
115