/** * \file blowfish.h * * \brief Blowfish block cipher */ /* * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: GPL-2.0 * * 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. * * 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 mbedtls_blowfish_context { 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 must never reuse a nonce value with the same key. Doing so * would void the encryption for the two messages encrypted with * the same nonce and key. * * There are two common strategies for managing nonces with CTR: * * 1. You can handle everything as a single message processed over * successive calls to this function. In that case, you want to * set \p nonce_counter and \p nc_off to 0 for the first call, and * then preserve the values of \p nonce_counter, \p nc_off and \p * stream_block across calls to this function as they will be * updated by this function. * * With this strategy, you must not encrypt more than 2**64 * blocks of data with the same key. * * 2. You can encrypt separate messages by dividing the \p * nonce_counter buffer in two areas: the first one used for a * per-message nonce, handled by yourself, and the second one * updated by this function internally. * * For example, you might reserve the first 4 bytes for the * per-message nonce, and the last 4 bytes for internal use. In that * case, before calling this function on a new message you need to * set the first 4 bytes of \p nonce_counter to your chosen nonce * value, the last 4 to 0, and \p nc_off to 0 (which will cause \p * stream_block to be ignored). That way, you can encrypt at most * 2**32 messages of up to 2**32 blocks each with the same key. * * The per-message nonce (or information sufficient to reconstruct * it) needs to be communicated with the ciphertext and must be unique. * The recommended way to ensure uniqueness is to use a message * counter. * * Note that for both stategies, sizes are measured in blocks and * that a Blowfish block is 8 bytes. * * \warning Upon return, \p stream_block contains sensitive data. Its * content must not be written to insecure storage and should be * securely discarded as soon as it's no longer needed. * * \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 */