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1 /**
2 * \file camellia.h
3 *
4 * \brief Camellia block cipher
5 */
6 /*
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: GPL-2.0
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 *
24 * This file is part of mbed TLS (https://tls.mbed.org)
25 */
26 #ifndef MBEDTLS_CAMELLIA_H
27 #define MBEDTLS_CAMELLIA_H
28
29 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include "config.h"
31 #else
32 #include MBEDTLS_CONFIG_FILE
33 #endif
34
35 #include <stddef.h>
36 #include <stdint.h>
37
38 #define MBEDTLS_CAMELLIA_ENCRYPT 1
39 #define MBEDTLS_CAMELLIA_DECRYPT 0
40
41 #define MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH -0x0024 /**< Invalid key length. */
42 #define MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH -0x0026 /**< Invalid data input length. */
43 #define MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED -0x0027 /**< Camellia hardware accelerator failed. */
44
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48
49 #if !defined(MBEDTLS_CAMELLIA_ALT)
50 // Regular implementation
51 //
52
53 /**
54 * \brief CAMELLIA context structure
55 */
56 typedef struct mbedtls_camellia_context
57 {
58 int nr; /*!< number of rounds */
59 uint32_t rk[68]; /*!< CAMELLIA round keys */
60 }
61 mbedtls_camellia_context;
62
63 #else /* MBEDTLS_CAMELLIA_ALT */
64 #include "camellia_alt.h"
65 #endif /* MBEDTLS_CAMELLIA_ALT */
66
67 /**
68 * \brief Initialize CAMELLIA context
69 *
70 * \param ctx CAMELLIA context to be initialized
71 */
72 void mbedtls_camellia_init( mbedtls_camellia_context *ctx );
73
74 /**
75 * \brief Clear CAMELLIA context
76 *
77 * \param ctx CAMELLIA context to be cleared
78 */
79 void mbedtls_camellia_free( mbedtls_camellia_context *ctx );
80
81 /**
82 * \brief CAMELLIA key schedule (encryption)
83 *
84 * \param ctx CAMELLIA context to be initialized
85 * \param key encryption key
86 * \param keybits must be 128, 192 or 256
87 *
88 * \return 0 if successful, or MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
89 */
90 int mbedtls_camellia_setkey_enc( mbedtls_camellia_context *ctx, const unsigned char *key,
91 unsigned int keybits );
92
93 /**
94 * \brief CAMELLIA key schedule (decryption)
95 *
96 * \param ctx CAMELLIA context to be initialized
97 * \param key decryption key
98 * \param keybits must be 128, 192 or 256
99 *
100 * \return 0 if successful, or MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
101 */
102 int mbedtls_camellia_setkey_dec( mbedtls_camellia_context *ctx, const unsigned char *key,
103 unsigned int keybits );
104
105 /**
106 * \brief CAMELLIA-ECB block encryption/decryption
107 *
108 * \param ctx CAMELLIA context
109 * \param mode MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
110 * \param input 16-byte input block
111 * \param output 16-byte output block
112 *
113 * \return 0 if successful
114 */
115 int mbedtls_camellia_crypt_ecb( mbedtls_camellia_context *ctx,
116 int mode,
117 const unsigned char input[16],
118 unsigned char output[16] );
119
120 #if defined(MBEDTLS_CIPHER_MODE_CBC)
121 /**
122 * \brief CAMELLIA-CBC buffer encryption/decryption
123 * Length should be a multiple of the block
124 * size (16 bytes)
125 *
126 * \note Upon exit, the content of the IV is updated so that you can
127 * call the function same function again on the following
128 * block(s) of data and get the same result as if it was
129 * encrypted in one call. This allows a "streaming" usage.
130 * If on the other hand you need to retain the contents of the
131 * IV, you should either save it manually or use the cipher
132 * module instead.
133 *
134 * \param ctx CAMELLIA context
135 * \param mode MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
136 * \param length length of the input data
137 * \param iv initialization vector (updated after use)
138 * \param input buffer holding the input data
139 * \param output buffer holding the output data
140 *
141 * \return 0 if successful, or
142 * MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
143 */
144 int mbedtls_camellia_crypt_cbc( mbedtls_camellia_context *ctx,
145 int mode,
146 size_t length,
147 unsigned char iv[16],
148 const unsigned char *input,
149 unsigned char *output );
150 #endif /* MBEDTLS_CIPHER_MODE_CBC */
151
152 #if defined(MBEDTLS_CIPHER_MODE_CFB)
153 /**
154 * \brief CAMELLIA-CFB128 buffer encryption/decryption
155 *
156 * Note: Due to the nature of CFB you should use the same key schedule for
157 * both encryption and decryption. So a context initialized with
158 * mbedtls_camellia_setkey_enc() for both MBEDTLS_CAMELLIA_ENCRYPT and CAMELLIE_DECRYPT.
159 *
160 * \note Upon exit, the content of the IV is updated so that you can
161 * call the function same function again on the following
162 * block(s) of data and get the same result as if it was
163 * encrypted in one call. This allows a "streaming" usage.
164 * If on the other hand you need to retain the contents of the
165 * IV, you should either save it manually or use the cipher
166 * module instead.
167 *
168 * \param ctx CAMELLIA context
169 * \param mode MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
170 * \param length length of the input data
171 * \param iv_off offset in IV (updated after use)
172 * \param iv initialization vector (updated after use)
173 * \param input buffer holding the input data
174 * \param output buffer holding the output data
175 *
176 * \return 0 if successful, or
177 * MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
178 */
179 int mbedtls_camellia_crypt_cfb128( mbedtls_camellia_context *ctx,
180 int mode,
181 size_t length,
182 size_t *iv_off,
183 unsigned char iv[16],
184 const unsigned char *input,
185 unsigned char *output );
186 #endif /* MBEDTLS_CIPHER_MODE_CFB */
187
188 #if defined(MBEDTLS_CIPHER_MODE_CTR)
189 /**
190 * \brief CAMELLIA-CTR buffer encryption/decryption
191 *
192 * Note: Due to the nature of CTR you should use the same key schedule for
193 * both encryption and decryption. So a context initialized with
194 * mbedtls_camellia_setkey_enc() for both MBEDTLS_CAMELLIA_ENCRYPT and MBEDTLS_CAMELLIA_DECRYPT.
195 *
196 * \warning You must never reuse a nonce value with the same key. Doing so
197 * would void the encryption for the two messages encrypted with
198 * the same nonce and key.
199 *
200 * There are two common strategies for managing nonces with CTR:
201 *
202 * 1. You can handle everything as a single message processed over
203 * successive calls to this function. In that case, you want to
204 * set \p nonce_counter and \p nc_off to 0 for the first call, and
205 * then preserve the values of \p nonce_counter, \p nc_off and \p
206 * stream_block across calls to this function as they will be
207 * updated by this function.
208 *
209 * With this strategy, you must not encrypt more than 2**128
210 * blocks of data with the same key.
211 *
212 * 2. You can encrypt separate messages by dividing the \p
213 * nonce_counter buffer in two areas: the first one used for a
214 * per-message nonce, handled by yourself, and the second one
215 * updated by this function internally.
216 *
217 * For example, you might reserve the first 12 bytes for the
218 * per-message nonce, and the last 4 bytes for internal use. In that
219 * case, before calling this function on a new message you need to
220 * set the first 12 bytes of \p nonce_counter to your chosen nonce
221 * value, the last 4 to 0, and \p nc_off to 0 (which will cause \p
222 * stream_block to be ignored). That way, you can encrypt at most
223 * 2**96 messages of up to 2**32 blocks each with the same key.
224 *
225 * The per-message nonce (or information sufficient to reconstruct
226 * it) needs to be communicated with the ciphertext and must be unique.
227 * The recommended way to ensure uniqueness is to use a message
228 * counter. An alternative is to generate random nonces, but this
229 * limits the number of messages that can be securely encrypted:
230 * for example, with 96-bit random nonces, you should not encrypt
231 * more than 2**32 messages with the same key.
232 *
233 * Note that for both stategies, sizes are measured in blocks and
234 * that a CAMELLIA block is 16 bytes.
235 *
236 * \warning Upon return, \p stream_block contains sensitive data. Its
237 * content must not be written to insecure storage and should be
238 * securely discarded as soon as it's no longer needed.
239 *
240 * \param ctx CAMELLIA context
241 * \param length The length of the data
242 * \param nc_off The offset in the current stream_block (for resuming
243 * within current cipher stream). The offset pointer to
244 * should be 0 at the start of a stream.
245 * \param nonce_counter The 128-bit nonce and counter.
246 * \param stream_block The saved stream-block for resuming. Is overwritten
247 * by the function.
248 * \param input The input data stream
249 * \param output The output data stream
250 *
251 * \return 0 if successful
252 */
253 int mbedtls_camellia_crypt_ctr( mbedtls_camellia_context *ctx,
254 size_t length,
255 size_t *nc_off,
256 unsigned char nonce_counter[16],
257 unsigned char stream_block[16],
258 const unsigned char *input,
259 unsigned char *output );
260 #endif /* MBEDTLS_CIPHER_MODE_CTR */
261
262 /**
263 * \brief Checkup routine
264 *
265 * \return 0 if successful, or 1 if the test failed
266 */
267 int mbedtls_camellia_self_test( int verbose );
268
269 #ifdef __cplusplus
270 }
271 #endif
272
273 #endif /* camellia.h */
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