1/*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska H��gskolan
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
36static krb5_error_code
37ARCFOUR_string_to_key(krb5_context context,
38		      krb5_enctype enctype,
39		      krb5_data password,
40		      krb5_salt salt,
41		      krb5_data opaque,
42		      krb5_keyblock *key)
43{
44    krb5_error_code ret;
45    uint16_t *s = NULL;
46    size_t len = 0, i;
47    EVP_MD_CTX *m;
48
49    m = EVP_MD_CTX_create();
50    if (m == NULL) {
51	ret = ENOMEM;
52	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
53	goto out;
54    }
55
56    EVP_DigestInit_ex(m, EVP_md4(), NULL);
57
58    ret = wind_utf8ucs2_length(password.data, &len);
59    if (ret) {
60	krb5_set_error_message (context, ret,
61				N_("Password not an UCS2 string", ""));
62	goto out;
63    }
64
65    s = malloc (len * sizeof(s[0]));
66    if (len != 0 && s == NULL) {
67	krb5_set_error_message (context, ENOMEM,
68				N_("malloc: out of memory", ""));
69	ret = ENOMEM;
70	goto out;
71    }
72
73    ret = wind_utf8ucs2(password.data, s, &len);
74    if (ret) {
75	krb5_set_error_message (context, ret,
76				N_("Password not an UCS2 string", ""));
77	goto out;
78    }
79
80    /* LE encoding */
81    for (i = 0; i < len; i++) {
82	unsigned char p;
83	p = (s[i] & 0xff);
84	EVP_DigestUpdate (m, &p, 1);
85	p = (s[i] >> 8) & 0xff;
86	EVP_DigestUpdate (m, &p, 1);
87    }
88
89    key->keytype = enctype;
90    ret = krb5_data_alloc (&key->keyvalue, 16);
91    if (ret) {
92	krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
93	goto out;
94    }
95    EVP_DigestFinal_ex (m, key->keyvalue.data, NULL);
96
97 out:
98    EVP_MD_CTX_destroy(m);
99    if (s)
100	memset (s, 0, len);
101    free (s);
102    return ret;
103}
104
105struct salt_type _krb5_arcfour_salt[] = {
106    {
107	KRB5_PW_SALT,
108	"pw-salt",
109	ARCFOUR_string_to_key
110    },
111    { 0 }
112};
113