1/*	$NetBSD: salt-des3.c,v 1.4 2023/06/19 21:41:44 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
38#ifdef DES3_OLD_ENCTYPE
39static krb5_error_code
40DES3_string_to_key(krb5_context context,
41		   krb5_enctype enctype,
42		   krb5_data password,
43		   krb5_salt salt,
44		   krb5_data opaque,
45		   krb5_keyblock *key)
46{
47    char *str;
48    size_t len;
49    unsigned char tmp[24];
50    DES_cblock keys[3];
51    krb5_error_code ret;
52
53    len = password.length + salt.saltvalue.length;
54    str = malloc(len);
55    if (len != 0 && str == NULL)
56	return krb5_enomem(context);
57    memcpy(str, password.data, password.length);
58    memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
59    {
60	DES_cblock ivec;
61	DES_key_schedule s[3];
62	int i;
63
64	ret = _krb5_n_fold(str, len, tmp, 24);
65	if (ret) {
66	    memset_s(str, len, 0, len);
67	    free(str);
68	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
69	    return ret;
70	}
71
72	for(i = 0; i < 3; i++){
73	    memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
74	    DES_set_odd_parity(keys + i);
75	    if(DES_is_weak_key(keys + i))
76		_krb5_xor8(*(keys + i), (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
77	    DES_set_key_unchecked(keys + i, &s[i]);
78	}
79	memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
80	DES_ede3_cbc_encrypt(tmp,
81			     tmp, sizeof(tmp),
82			     &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
83	memset_s(s, sizeof(s), 0, sizeof(s));
84	memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
85	for(i = 0; i < 3; i++){
86	    memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
87	    DES_set_odd_parity(keys + i);
88	    if(DES_is_weak_key(keys + i))
89		_krb5_xor8(*(keys + i), (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
90	}
91	memset_s(tmp, sizeof(tmp), 0, sizeof(tmp));
92    }
93    key->keytype = enctype;
94    krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
95    memset_s(keys, sizeof(keys), 0, sizeof(keys));
96    memset_s(str, len, 0, len);
97    free(str);
98    return 0;
99}
100#endif
101
102static krb5_error_code
103DES3_string_to_key_derived(krb5_context context,
104			   krb5_enctype enctype,
105			   krb5_data password,
106			   krb5_salt salt,
107			   krb5_data opaque,
108			   krb5_keyblock *key)
109{
110    krb5_error_code ret;
111    size_t len = password.length + salt.saltvalue.length;
112    char *s;
113
114    s = malloc(len);
115    if (len != 0 && s == NULL)
116	return krb5_enomem(context);
117    memcpy(s, password.data, password.length);
118    if (salt.saltvalue.length)
119        memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
120    ret = krb5_string_to_key_derived(context,
121				     s,
122				     len,
123				     enctype,
124				     key);
125    memset_s(s, len, 0, len);
126    free(s);
127    return ret;
128}
129
130
131#ifdef DES3_OLD_ENCTYPE
132struct salt_type _krb5_des3_salt[] = {
133    {
134	KRB5_PW_SALT,
135	"pw-salt",
136	DES3_string_to_key
137    },
138    { 0, NULL, NULL }
139};
140#endif
141
142struct salt_type _krb5_des3_salt_derived[] = {
143    {
144	KRB5_PW_SALT,
145	"pw-salt",
146	DES3_string_to_key_derived
147    },
148    { 0, NULL, NULL }
149};
150