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
44 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_keyblock_zero(krb5_keyblock * keyblock)45 krb5_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
60 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_keyblock_contents(krb5_context context,krb5_keyblock * keyblock)61 krb5_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 = 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
82 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_keyblock(krb5_context context,krb5_keyblock * keyblock)83 krb5_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
105 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_keyblock_contents(krb5_context context,const krb5_keyblock * inblock,krb5_keyblock * to)106 krb5_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
127 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_keyblock(krb5_context context,const krb5_keyblock * inblock,krb5_keyblock ** to)128 krb5_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
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