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DEFINITIONS
This source file includes following definitions.
- aes_init
- aes_do_cipher
- aes_cleanup
- EVP_hcrypto_aes_128_cbc
- EVP_hcrypto_aes_192_cbc
- EVP_hcrypto_aes_256_cbc
1 /*
2 * Copyright (c) 2006 - 2008 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 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 #endif
37
38 RCSID("$Id$");
39
40 #define HC_DEPRECATED
41
42 #include <sys/types.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <assert.h>
47
48 #include <evp.h>
49
50 #include <krb5-types.h>
51
52 #include <aes.h>
53
54 /*
55 *
56 */
57
58 static int
59 aes_init(EVP_CIPHER_CTX *ctx,
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60 const unsigned char * key,
61 const unsigned char * iv,
62 int encp)
63 {
64 AES_KEY *k = ctx->cipher_data;
65 if (ctx->encrypt)
66 AES_set_encrypt_key(key, ctx->cipher->key_len * 8, k);
67 else
68 AES_set_decrypt_key(key, ctx->cipher->key_len * 8, k);
69 return 1;
70 }
71
72 static int
73 aes_do_cipher(EVP_CIPHER_CTX *ctx,
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74 unsigned char *out,
75 const unsigned char *in,
76 unsigned int size)
77 {
78 AES_KEY *k = ctx->cipher_data;
79 AES_cbc_encrypt(in, out, size, k, ctx->iv, ctx->encrypt);
80 return 1;
81 }
82
83 static int
84 aes_cleanup(EVP_CIPHER_CTX *ctx)
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85 {
86 memset(ctx->cipher_data, 0, sizeof(AES_KEY));
87 return 1;
88 }
89
90 /**
91 * The AES-128 cipher type (hcrypto)
92 *
93 * @return the AES-128 EVP_CIPHER pointer.
94 *
95 * @ingroup hcrypto_evp
96 */
97
98 const EVP_CIPHER *
99 EVP_hcrypto_aes_128_cbc(void)
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100 {
101 static const EVP_CIPHER aes_128_cbc = {
102 0,
103 16,
104 16,
105 16,
106 EVP_CIPH_CBC_MODE,
107 aes_init,
108 aes_do_cipher,
109 aes_cleanup,
110 sizeof(AES_KEY),
111 NULL,
112 NULL,
113 NULL,
114 NULL
115 };
116
117 return &aes_128_cbc;
118 }
119
120 /**
121 * The AES-192 cipher type (hcrypto)
122 *
123 * @return the AES-192 EVP_CIPHER pointer.
124 *
125 * @ingroup hcrypto_evp
126 */
127
128 const EVP_CIPHER *
129 EVP_hcrypto_aes_192_cbc(void)
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130 {
131 static const EVP_CIPHER aes_192_cbc = {
132 0,
133 16,
134 24,
135 16,
136 EVP_CIPH_CBC_MODE,
137 aes_init,
138 aes_do_cipher,
139 aes_cleanup,
140 sizeof(AES_KEY),
141 NULL,
142 NULL,
143 NULL,
144 NULL
145 };
146 return &aes_192_cbc;
147 }
148
149 /**
150 * The AES-256 cipher type (hcrypto)
151 *
152 * @return the AES-256 EVP_CIPHER pointer.
153 *
154 * @ingroup hcrypto_evp
155 */
156
157 const EVP_CIPHER *
158 EVP_hcrypto_aes_256_cbc(void)
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159 {
160 static const EVP_CIPHER aes_256_cbc = {
161 0,
162 16,
163 32,
164 16,
165 EVP_CIPH_CBC_MODE,
166 aes_init,
167 aes_do_cipher,
168 aes_cleanup,
169 sizeof(AES_KEY),
170 NULL,
171 NULL,
172 NULL,
173 NULL
174 };
175 return &aes_256_cbc;
176 }