4 * \brief Blowfish block cipher
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: Apache-2.0
10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
11 * not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
22 * This file is part of mbed TLS (https://tls.mbed.org)
24 #ifndef MBEDTLS_BLOWFISH_H
25 #define MBEDTLS_BLOWFISH_H
27 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include MBEDTLS_CONFIG_FILE
36 #include "platform_util.h"
38 #define MBEDTLS_BLOWFISH_ENCRYPT 1
39 #define MBEDTLS_BLOWFISH_DECRYPT 0
40 #define MBEDTLS_BLOWFISH_MAX_KEY_BITS 448
41 #define MBEDTLS_BLOWFISH_MIN_KEY_BITS 32
42 #define MBEDTLS_BLOWFISH_ROUNDS 16 /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */
43 #define MBEDTLS_BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */
45 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
46 #define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0016 )
47 #endif /* !MBEDTLS_DEPRECATED_REMOVED */
48 #define MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA -0x0016 /**< Bad input data. */
50 #define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 /**< Invalid data input length. */
52 /* MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED is deprecated and should not be used.
54 #define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED -0x0017 /**< Blowfish hardware accelerator failed. */
60 #if !defined(MBEDTLS_BLOWFISH_ALT)
61 // Regular implementation
65 * \brief Blowfish context structure
67 typedef struct mbedtls_blowfish_context
69 uint32_t P[MBEDTLS_BLOWFISH_ROUNDS + 2]; /*!< Blowfish round keys */
70 uint32_t S[4][256]; /*!< key dependent S-boxes */
72 mbedtls_blowfish_context;
74 #else /* MBEDTLS_BLOWFISH_ALT */
75 #include "blowfish_alt.h"
76 #endif /* MBEDTLS_BLOWFISH_ALT */
79 * \brief Initialize a Blowfish context.
81 * \param ctx The Blowfish context to be initialized.
82 * This must not be \c NULL.
84 void mbedtls_blowfish_init( mbedtls_blowfish_context *ctx );
87 * \brief Clear a Blowfish context.
89 * \param ctx The Blowfish context to be cleared.
90 * This may be \c NULL, in which case this function
91 * returns immediately. If it is not \c NULL, it must
92 * point to an initialized Blowfish context.
94 void mbedtls_blowfish_free( mbedtls_blowfish_context *ctx );
97 * \brief Perform a Blowfish key schedule operation.
99 * \param ctx The Blowfish context to perform the key schedule on.
100 * \param key The encryption key. This must be a readable buffer of
101 * length \p keybits Bits.
102 * \param keybits The length of \p key in Bits. This must be between
103 * \c 32 and \c 448 and a multiple of \c 8.
105 * \return \c 0 if successful.
106 * \return A negative error code on failure.
108 int mbedtls_blowfish_setkey( mbedtls_blowfish_context *ctx, const unsigned char *key,
109 unsigned int keybits );
112 * \brief Perform a Blowfish-ECB block encryption/decryption operation.
114 * \param ctx The Blowfish context to use. This must be initialized
115 * and bound to a key.
116 * \param mode The mode of operation. Possible values are
117 * #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
118 * #MBEDTLS_BLOWFISH_DECRYPT for decryption.
119 * \param input The input block. This must be a readable buffer
120 * of size \c 8 Bytes.
121 * \param output The output block. This must be a writable buffer
122 * of size \c 8 Bytes.
124 * \return \c 0 if successful.
125 * \return A negative error code on failure.
127 int mbedtls_blowfish_crypt_ecb( mbedtls_blowfish_context *ctx,
129 const unsigned char input[MBEDTLS_BLOWFISH_BLOCKSIZE],
130 unsigned char output[MBEDTLS_BLOWFISH_BLOCKSIZE] );
132 #if defined(MBEDTLS_CIPHER_MODE_CBC)
134 * \brief Perform a Blowfish-CBC buffer encryption/decryption operation.
136 * \note Upon exit, the content of the IV is updated so that you can
137 * call the function same function again on the following
138 * block(s) of data and get the same result as if it was
139 * encrypted in one call. This allows a "streaming" usage.
140 * If on the other hand you need to retain the contents of the
141 * IV, you should either save it manually or use the cipher
144 * \param ctx The Blowfish context to use. This must be initialized
145 * and bound to a key.
146 * \param mode The mode of operation. Possible values are
147 * #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
148 * #MBEDTLS_BLOWFISH_DECRYPT for decryption.
149 * \param length The length of the input data in Bytes. This must be
151 * \param iv The initialization vector. This must be a read/write buffer
152 * of length \c 8 Bytes. It is updated by this function.
153 * \param input The input data. This must be a readable buffer of length
155 * \param output The output data. This must be a writable buffer of length
158 * \return \c 0 if successful.
159 * \return A negative error code on failure.
161 int mbedtls_blowfish_crypt_cbc( mbedtls_blowfish_context *ctx,
164 unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE],
165 const unsigned char *input,
166 unsigned char *output );
167 #endif /* MBEDTLS_CIPHER_MODE_CBC */
169 #if defined(MBEDTLS_CIPHER_MODE_CFB)
171 * \brief Perform a Blowfish CFB buffer encryption/decryption operation.
173 * \note Upon exit, the content of the IV is updated so that you can
174 * call the function same function again on the following
175 * block(s) of data and get the same result as if it was
176 * encrypted in one call. This allows a "streaming" usage.
177 * If on the other hand you need to retain the contents of the
178 * IV, you should either save it manually or use the cipher
181 * \param ctx The Blowfish context to use. This must be initialized
182 * and bound to a key.
183 * \param mode The mode of operation. Possible values are
184 * #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
185 * #MBEDTLS_BLOWFISH_DECRYPT for decryption.
186 * \param length The length of the input data in Bytes.
187 * \param iv_off The offset in the initialiation vector.
188 * The value pointed to must be smaller than \c 8 Bytes.
189 * It is updated by this function to support the aforementioned
191 * \param iv The initialization vector. This must be a read/write buffer
192 * of size \c 8 Bytes. It is updated after use.
193 * \param input The input data. This must be a readable buffer of length
195 * \param output The output data. This must be a writable buffer of length
198 * \return \c 0 if successful.
199 * \return A negative error code on failure.
201 int mbedtls_blowfish_crypt_cfb64( mbedtls_blowfish_context *ctx,
205 unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE],
206 const unsigned char *input,
207 unsigned char *output );
208 #endif /*MBEDTLS_CIPHER_MODE_CFB */
210 #if defined(MBEDTLS_CIPHER_MODE_CTR)
212 * \brief Perform a Blowfish-CTR buffer encryption/decryption operation.
214 * \warning You must never reuse a nonce value with the same key. Doing so
215 * would void the encryption for the two messages encrypted with
216 * the same nonce and key.
218 * There are two common strategies for managing nonces with CTR:
220 * 1. You can handle everything as a single message processed over
221 * successive calls to this function. In that case, you want to
222 * set \p nonce_counter and \p nc_off to 0 for the first call, and
223 * then preserve the values of \p nonce_counter, \p nc_off and \p
224 * stream_block across calls to this function as they will be
225 * updated by this function.
227 * With this strategy, you must not encrypt more than 2**64
228 * blocks of data with the same key.
230 * 2. You can encrypt separate messages by dividing the \p
231 * nonce_counter buffer in two areas: the first one used for a
232 * per-message nonce, handled by yourself, and the second one
233 * updated by this function internally.
235 * For example, you might reserve the first 4 bytes for the
236 * per-message nonce, and the last 4 bytes for internal use. In that
237 * case, before calling this function on a new message you need to
238 * set the first 4 bytes of \p nonce_counter to your chosen nonce
239 * value, the last 4 to 0, and \p nc_off to 0 (which will cause \p
240 * stream_block to be ignored). That way, you can encrypt at most
241 * 2**32 messages of up to 2**32 blocks each with the same key.
243 * The per-message nonce (or information sufficient to reconstruct
244 * it) needs to be communicated with the ciphertext and must be unique.
245 * The recommended way to ensure uniqueness is to use a message
248 * Note that for both stategies, sizes are measured in blocks and
249 * that a Blowfish block is 8 bytes.
251 * \warning Upon return, \p stream_block contains sensitive data. Its
252 * content must not be written to insecure storage and should be
253 * securely discarded as soon as it's no longer needed.
255 * \param ctx The Blowfish context to use. This must be initialized
256 * and bound to a key.
257 * \param length The length of the input data in Bytes.
258 * \param nc_off The offset in the current stream_block (for resuming
259 * within current cipher stream). The offset pointer
260 * should be \c 0 at the start of a stream and must be
261 * smaller than \c 8. It is updated by this function.
262 * \param nonce_counter The 64-bit nonce and counter. This must point to a
263 * read/write buffer of length \c 8 Bytes.
264 * \param stream_block The saved stream-block for resuming. This must point to
265 * a read/write buffer of length \c 8 Bytes.
266 * \param input The input data. This must be a readable buffer of
267 * length \p length Bytes.
268 * \param output The output data. This must be a writable buffer of
269 * length \p length Bytes.
271 * \return \c 0 if successful.
272 * \return A negative error code on failure.
274 int mbedtls_blowfish_crypt_ctr( mbedtls_blowfish_context *ctx,
277 unsigned char nonce_counter[MBEDTLS_BLOWFISH_BLOCKSIZE],
278 unsigned char stream_block[MBEDTLS_BLOWFISH_BLOCKSIZE],
279 const unsigned char *input,
280 unsigned char *output );
281 #endif /* MBEDTLS_CIPHER_MODE_CTR */
287 #endif /* blowfish.h */