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