mbedtls/include/polarssl/blowfish.h

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/**
* \file blowfish.h
*
* \brief Blowfish block cipher
*
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* Copyright (C) 2012-2014, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://www.polarssl.org)
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*
* 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
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#include <string.h>
#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
#include <basetsd.h>
typedef UINT32 uint32_t;
#else
#include <inttypes.h>
#endif
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#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 */
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#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
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/**
* \brief Blowfish context structure
*/
typedef struct
{
uint32_t P[BLOWFISH_ROUNDS + 2]; /*!< Blowfish round keys */
uint32_t S[4][256]; /*!< key dependent S-boxes */
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}
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 );
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/**
* \brief Blowfish key schedule
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*
* \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 );
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/**
* \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)
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/**
* \brief Blowfish-CBC buffer encryption/decryption
* Length should be a multiple of the block
* size (8 bytes)
*
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* \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.
*
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* \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
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*/
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 */
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#if defined(POLARSSL_CIPHER_MODE_CFB)
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/**
* \brief Blowfish CFB buffer encryption/decryption.
*
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* \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.
*
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* \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 */
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#if defined(POLARSSL_CIPHER_MODE_CTR)
/**
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* \brief Blowfish-CTR buffer encryption/decryption
*
* Warning: You have to keep the maximum use of your counter in mind!
*
* \param ctx Blowfish context
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* \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 */
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#ifdef __cplusplus
}
#endif
#else /* POLARSSL_BLOWFISH_ALT */
#include "blowfish_alt.h"
#endif /* POLARSSL_BLOWFISH_ALT */
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#endif /* blowfish.h */