/** * \file blowfish.h * * \brief Blowfish block cipher */ /* * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of mbed TLS (https://tls.mbed.org) */ #ifndef MBEDTLS_BLOWFISH_H #define MBEDTLS_BLOWFISH_H #if !defined(MBEDTLS_CONFIG_FILE) #include "config.h" #else #include MBEDTLS_CONFIG_FILE #endif #include #include #define MBEDTLS_BLOWFISH_ENCRYPT 1 #define MBEDTLS_BLOWFISH_DECRYPT 0 #define MBEDTLS_BLOWFISH_MAX_KEY_BITS 448 #define MBEDTLS_BLOWFISH_MIN_KEY_BITS 32 #define MBEDTLS_BLOWFISH_ROUNDS 16 /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */ #define MBEDTLS_BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */ #define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH -0x0016 /**< Invalid key length. */ #define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED -0x0017 /**< Blowfish hardware accelerator failed. */ #define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 /**< Invalid data input length. */ #ifdef __cplusplus extern "C" { #endif #if !defined(MBEDTLS_BLOWFISH_ALT) // Regular implementation // /** * \brief Blowfish context structure */ typedef struct { uint32_t P[MBEDTLS_BLOWFISH_ROUNDS + 2]; /*!< Blowfish round keys */ uint32_t S[4][256]; /*!< key dependent S-boxes */ } mbedtls_blowfish_context; #else /* MBEDTLS_BLOWFISH_ALT */ #include "blowfish_alt.h" #endif /* MBEDTLS_BLOWFISH_ALT */ /** * \brief Initialize Blowfish context * * \param ctx Blowfish context to be initialized */ void mbedtls_blowfish_init( mbedtls_blowfish_context *ctx ); /** * \brief Clear Blowfish context * * \param ctx Blowfish context to be cleared */ void mbedtls_blowfish_free( mbedtls_blowfish_context *ctx ); /** * \brief Blowfish key schedule * * \param ctx Blowfish context to be initialized * \param key encryption key * \param keybits must be between 32 and 448 bits * * \return 0 if successful, or MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH */ int mbedtls_blowfish_setkey( mbedtls_blowfish_context *ctx, const unsigned char *key, unsigned int keybits ); /** * \brief Blowfish-ECB block encryption/decryption * * \param ctx Blowfish context * \param mode MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT * \param input 8-byte input block * \param output 8-byte output block * * \return 0 if successful */ int mbedtls_blowfish_crypt_ecb( mbedtls_blowfish_context *ctx, int mode, const unsigned char input[MBEDTLS_BLOWFISH_BLOCKSIZE], unsigned char output[MBEDTLS_BLOWFISH_BLOCKSIZE] ); #if defined(MBEDTLS_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 MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_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 * MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH */ int mbedtls_blowfish_crypt_cbc( mbedtls_blowfish_context *ctx, int mode, size_t length, unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output ); #endif /* MBEDTLS_CIPHER_MODE_CBC */ #if defined(MBEDTLS_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 MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_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 mbedtls_blowfish_crypt_cfb64( mbedtls_blowfish_context *ctx, int mode, size_t length, size_t *iv_off, unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output ); #endif /*MBEDTLS_CIPHER_MODE_CFB */ #if defined(MBEDTLS_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 mbedtls_blowfish_crypt_ctr( mbedtls_blowfish_context *ctx, size_t length, size_t *nc_off, unsigned char nonce_counter[MBEDTLS_BLOWFISH_BLOCKSIZE], unsigned char stream_block[MBEDTLS_BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output ); #endif /* MBEDTLS_CIPHER_MODE_CTR */ #ifdef __cplusplus } #endif #endif /* blowfish.h */