1 /* $NetBSD: keyblock.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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 /**
39 * Zero out a keyblock
40 *
41 * @param keyblock keyblock to zero out
42 *
43 * @ingroup krb5_crypto
44 */
45
46 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_keyblock_zero(krb5_keyblock * keyblock)47 krb5_keyblock_zero(krb5_keyblock *keyblock)
48 {
49 keyblock->keytype = 0;
50 krb5_data_zero(&keyblock->keyvalue);
51 }
52
53 /**
54 * Free a keyblock's content, also zero out the content of the keyblock.
55 *
56 * @param context a Kerberos 5 context
57 * @param keyblock keyblock content to free, NULL is valid argument
58 *
59 * @ingroup krb5_crypto
60 */
61
62 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_keyblock_contents(krb5_context context,krb5_keyblock * keyblock)63 krb5_free_keyblock_contents(krb5_context context,
64 krb5_keyblock *keyblock)
65 {
66 if(keyblock) {
67 if (keyblock->keyvalue.data != NULL)
68 memset(keyblock->keyvalue.data, 0, keyblock->keyvalue.length);
69 krb5_data_free (&keyblock->keyvalue);
70 keyblock->keytype = KRB5_ENCTYPE_NULL;
71 }
72 }
73
74 /**
75 * Free a keyblock, also zero out the content of the keyblock, uses
76 * krb5_free_keyblock_contents() to free the content.
77 *
78 * @param context a Kerberos 5 context
79 * @param keyblock keyblock to free, NULL is valid argument
80 *
81 * @ingroup krb5_crypto
82 */
83
84 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_keyblock(krb5_context context,krb5_keyblock * keyblock)85 krb5_free_keyblock(krb5_context context,
86 krb5_keyblock *keyblock)
87 {
88 if(keyblock){
89 krb5_free_keyblock_contents(context, keyblock);
90 free(keyblock);
91 }
92 }
93
94 /**
95 * Copy a keyblock, free the output keyblock with
96 * krb5_free_keyblock_contents().
97 *
98 * @param context a Kerberos 5 context
99 * @param inblock the key to copy
100 * @param to the output key.
101 *
102 * @return 0 on success or a Kerberos 5 error code
103 *
104 * @ingroup krb5_crypto
105 */
106
107 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_keyblock_contents(krb5_context context,const krb5_keyblock * inblock,krb5_keyblock * to)108 krb5_copy_keyblock_contents (krb5_context context,
109 const krb5_keyblock *inblock,
110 krb5_keyblock *to)
111 {
112 return copy_EncryptionKey(inblock, to);
113 }
114
115 /**
116 * Copy a keyblock, free the output keyblock with
117 * krb5_free_keyblock().
118 *
119 * @param context a Kerberos 5 context
120 * @param inblock the key to copy
121 * @param to the output key.
122 *
123 * @return 0 on success or a Kerberos 5 error code
124 *
125 * @ingroup krb5_crypto
126 */
127
128
129 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_keyblock(krb5_context context,const krb5_keyblock * inblock,krb5_keyblock ** to)130 krb5_copy_keyblock (krb5_context context,
131 const krb5_keyblock *inblock,
132 krb5_keyblock **to)
133 {
134 krb5_error_code ret;
135 krb5_keyblock *k;
136
137 *to = NULL;
138
139 k = calloc (1, sizeof(*k));
140 if (k == NULL)
141 return krb5_enomem(context);
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
158 KRB5_LIB_FUNCTION krb5_enctype KRB5_LIB_CALL
krb5_keyblock_get_enctype(const krb5_keyblock * block)159 krb5_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
173 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_keyblock_init(krb5_context context,krb5_enctype type,const void * data,size_t size,krb5_keyblock * key)174 krb5_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