/** * \file blowfish.h * * \brief Blowfish block cipher * * Copyright (C) 2012-2014, ARM Limited, All Rights Reserved * * This file is part of mbed TLS (https://tls.mbed.org) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef POLARSSL_BLOWFISH_H #define POLARSSL_BLOWFISH_H #if !defined(POLARSSL_CONFIG_FILE) #include "config.h" #else #include POLARSSL_CONFIG_FILE #endif #include #if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32) #include typedef UINT32 uint32_t; #else #include #endif #define BLOWFISH_ENCRYPT 1 #define BLOWFISH_DECRYPT 0 #define BLOWFISH_MAX_KEY 448 #define BLOWFISH_MIN_KEY 32 #define BLOWFISH_ROUNDS 16 /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */ #define BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */ #define POLARSSL_ERR_BLOWFISH_INVALID_KEY_LENGTH -0x0016 /**< Invalid key length. */ #define POLARSSL_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 /**< Invalid data input length. */ #if !defined(POLARSSL_BLOWFISH_ALT) // Regular implementation // #ifdef __cplusplus extern "C" { #endif /** * \brief Blowfish context structure */ typedef struct { uint32_t P[BLOWFISH_ROUNDS + 2]; /*!< Blowfish round keys */ uint32_t S[4][256]; /*!< key dependent S-boxes */ } blowfish_context; /** * \brief Initialize Blowfish context * * \param ctx Blowfish context to be initialized */ void blowfish_init( blowfish_context *ctx ); /** * \brief Clear Blowfish context * * \param ctx Blowfish context to be cleared */ void blowfish_free( blowfish_context *ctx ); /** * \brief Blowfish key schedule * * \param ctx Blowfish context to be initialized * \param key encryption key * \param keysize must be between 32 and 448 bits * * \return 0 if successful, or POLARSSL_ERR_BLOWFISH_INVALID_KEY_LENGTH */ int blowfish_setkey( blowfish_context *ctx, const unsigned char *key, unsigned int keysize ); /** * \brief Blowfish-ECB block encryption/decryption * * \param ctx Blowfish context * \param mode BLOWFISH_ENCRYPT or BLOWFISH_DECRYPT * \param input 8-byte input block * \param output 8-byte output block * * \return 0 if successful */ int blowfish_crypt_ecb( blowfish_context *ctx, int mode, const unsigned char input[BLOWFISH_BLOCKSIZE], unsigned char output[BLOWFISH_BLOCKSIZE] ); #if defined(POLARSSL_CIPHER_MODE_CBC) /** * \brief Blowfish-CBC buffer encryption/decryption * Length should be a multiple of the block * size (8 bytes) * * \note Upon exit, the content of the IV is updated so that you can * call the function same function again on the following * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If on the other hand you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * \param ctx Blowfish context * \param mode BLOWFISH_ENCRYPT or BLOWFISH_DECRYPT * \param length length of the input data * \param iv initialization vector (updated after use) * \param input buffer holding the input data * \param output buffer holding the output data * * \return 0 if successful, or * POLARSSL_ERR_BLOWFISH_INVALID_INPUT_LENGTH */ int blowfish_crypt_cbc( blowfish_context *ctx, int mode, size_t length, unsigned char iv[BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output ); #endif /* POLARSSL_CIPHER_MODE_CBC */ #if defined(POLARSSL_CIPHER_MODE_CFB) /** * \brief Blowfish CFB buffer encryption/decryption. * * \note Upon exit, the content of the IV is updated so that you can * call the function same function again on the following * block(s) of data and get the same result as if it was * encrypted in one call. This allows a "streaming" usage. * If on the other hand you need to retain the contents of the * IV, you should either save it manually or use the cipher * module instead. * * \param ctx Blowfish context * \param mode BLOWFISH_ENCRYPT or BLOWFISH_DECRYPT * \param length length of the input data * \param iv_off offset in IV (updated after use) * \param iv initialization vector (updated after use) * \param input buffer holding the input data * \param output buffer holding the output data * * \return 0 if successful */ int blowfish_crypt_cfb64( blowfish_context *ctx, int mode, size_t length, size_t *iv_off, unsigned char iv[BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output ); #endif /*POLARSSL_CIPHER_MODE_CFB */ #if defined(POLARSSL_CIPHER_MODE_CTR) /** * \brief Blowfish-CTR buffer encryption/decryption * * Warning: You have to keep the maximum use of your counter in mind! * * \param ctx Blowfish context * \param length The length of the data * \param nc_off The offset in the current stream_block (for resuming * within current cipher stream). The offset pointer to * should be 0 at the start of a stream. * \param nonce_counter The 64-bit nonce and counter. * \param stream_block The saved stream-block for resuming. Is overwritten * by the function. * \param input The input data stream * \param output The output data stream * * \return 0 if successful */ int blowfish_crypt_ctr( blowfish_context *ctx, size_t length, size_t *nc_off, unsigned char nonce_counter[BLOWFISH_BLOCKSIZE], unsigned char stream_block[BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output ); #endif /* POLARSSL_CIPHER_MODE_CTR */ #ifdef __cplusplus } #endif #else /* POLARSSL_BLOWFISH_ALT */ #include "blowfish_alt.h" #endif /* POLARSSL_BLOWFISH_ALT */ #endif /* blowfish.h */