1/*
2 * Copyright (c) 1997 - 2001 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
36/**
37 * Zero out a keyblock
38 *
39 * @param keyblock keyblock to zero out
40 *
41 * @ingroup krb5_crypto
42 */
43
44KRB5_LIB_FUNCTION void KRB5_LIB_CALL
45krb5_keyblock_zero(krb5_keyblock *keyblock)
46{
47    keyblock->keytype = 0;
48    krb5_data_zero(&keyblock->keyvalue);
49}
50
51/**
52 * Free a keyblock's content, also zero out the content of the keyblock.
53 *
54 * @param context a Kerberos 5 context
55 * @param keyblock keyblock content to free, NULL is valid argument
56 *
57 * @ingroup krb5_crypto
58 */
59
60KRB5_LIB_FUNCTION void KRB5_LIB_CALL
61krb5_free_keyblock_contents(krb5_context context,
62			    krb5_keyblock *keyblock)
63{
64    if(keyblock) {
65	if (keyblock->keyvalue.data != NULL)
66	    memset(keyblock->keyvalue.data, 0, keyblock->keyvalue.length);
67	krb5_data_free (&keyblock->keyvalue);
68	keyblock->keytype = KRB5_ENCTYPE_NULL;
69    }
70}
71
72/**
73 * Free a keyblock, also zero out the content of the keyblock, uses
74 * krb5_free_keyblock_contents() to free the content.
75 *
76 * @param context a Kerberos 5 context
77 * @param keyblock keyblock to free, NULL is valid argument
78 *
79 * @ingroup krb5_crypto
80 */
81
82KRB5_LIB_FUNCTION void KRB5_LIB_CALL
83krb5_free_keyblock(krb5_context context,
84		   krb5_keyblock *keyblock)
85{
86    if(keyblock){
87	krb5_free_keyblock_contents(context, keyblock);
88	free(keyblock);
89    }
90}
91
92/**
93 * Copy a keyblock, free the output keyblock with
94 * krb5_free_keyblock_contents().
95 *
96 * @param context a Kerberos 5 context
97 * @param inblock the key to copy
98 * @param to the output key.
99 *
100 * @return 0 on success or a Kerberos 5 error code
101 *
102 * @ingroup krb5_crypto
103 */
104
105KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
106krb5_copy_keyblock_contents (krb5_context context,
107			     const krb5_keyblock *inblock,
108			     krb5_keyblock *to)
109{
110    return copy_EncryptionKey(inblock, to);
111}
112
113/**
114 * Copy a keyblock, free the output keyblock with
115 * krb5_free_keyblock().
116 *
117 * @param context a Kerberos 5 context
118 * @param inblock the key to copy
119 * @param to the output key.
120 *
121 * @return 0 on success or a Kerberos 5 error code
122 *
123 * @ingroup krb5_crypto
124 */
125
126
127KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
128krb5_copy_keyblock (krb5_context context,
129		    const krb5_keyblock *inblock,
130		    krb5_keyblock **to)
131{
132    krb5_error_code ret;
133    krb5_keyblock *k;
134
135    *to = NULL;
136
137    k = calloc (1, sizeof(*k));
138    if (k == NULL) {
139	krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
140	return ENOMEM;
141    }
142
143    ret = krb5_copy_keyblock_contents (context, inblock, k);
144    if (ret) {
145      free(k);
146      return ret;
147    }
148    *to = k;
149    return 0;
150}
151
152/**
153 * Get encryption type of a keyblock.
154 *
155 * @ingroup krb5_crypto
156 */
157
158KRB5_LIB_FUNCTION krb5_enctype KRB5_LIB_CALL
159krb5_keyblock_get_enctype(const krb5_keyblock *block)
160{
161    return block->keytype;
162}
163
164/**
165 * Fill in `key' with key data of type `enctype' from `data' of length
166 * `size'. Key should be freed using krb5_free_keyblock_contents().
167 *
168 * @return 0 on success or a Kerberos 5 error code
169 *
170 * @ingroup krb5_crypto
171 */
172
173KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
174krb5_keyblock_init(krb5_context context,
175		   krb5_enctype type,
176		   const void *data,
177		   size_t size,
178		   krb5_keyblock *key)
179{
180    krb5_error_code ret;
181    size_t len;
182
183    memset(key, 0, sizeof(*key));
184
185    ret = krb5_enctype_keysize(context, type, &len);
186    if (ret)
187	return ret;
188
189    if (len != size) {
190	krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
191			       "Encryption key %d is %lu bytes "
192			       "long, %lu was passed in",
193			       type, (unsigned long)len, (unsigned long)size);
194	return KRB5_PROG_ETYPE_NOSUPP;
195    }
196    ret = krb5_data_copy(&key->keyvalue, data, len);
197    if(ret) {
198	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
199	return ret;
200    }
201    key->keytype = type;
202
203    return 0;
204}
205