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mbed TLS library

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blowfish.h File Reference
Data Structures | Functions

blowfish.h File Reference

Blowfish block cipher. More...

Go to the source code of this file.

Data Structures

struct  blowfish_context
 Blowfish context structure. More...

Functions

void blowfish_init (blowfish_context *ctx)
 Initialize Blowfish context.
void blowfish_free (blowfish_context *ctx)
 Clear Blowfish context.
int blowfish_setkey (blowfish_context *ctx, const unsigned char *key, unsigned int keysize)
 Blowfish key schedule.
int blowfish_crypt_ecb (blowfish_context *ctx, int mode, const unsigned char input[BLOWFISH_BLOCKSIZE], unsigned char output[BLOWFISH_BLOCKSIZE])
 Blowfish-ECB block encryption/decryption.
int blowfish_crypt_cbc (blowfish_context *ctx, int mode, size_t length, unsigned char iv[BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output)
 Blowfish-CBC buffer encryption/decryption Length should be a multiple of the block size (8 bytes)
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)
 Blowfish CFB buffer encryption/decryption.
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)
 Blowfish-CTR buffer encryption/decryption.

Detailed Description

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.

Definition in file blowfish.h.

Function Documentation

int blowfish_crypt_cbc ( blowfish_context *  ctx,
int  mode,
size_t  length,
unsigned char  iv[BLOWFISH_BLOCKSIZE],
const unsigned char *  input,
unsigned char *  output 
)

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.
Parameters:
ctxBlowfish context
modeBLOWFISH_ENCRYPT or BLOWFISH_DECRYPT
lengthlength of the input data
ivinitialization vector (updated after use)
inputbuffer holding the input data
outputbuffer holding the output data
Returns:
0 if successful, or POLARSSL_ERR_BLOWFISH_INVALID_INPUT_LENGTH

Definition at line 262 of file blowfish.c.

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 
)

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.
Parameters:
ctxBlowfish context
modeBLOWFISH_ENCRYPT or BLOWFISH_DECRYPT
lengthlength of the input data
iv_offoffset in IV (updated after use)
ivinitialization vector (updated after use)
inputbuffer holding the input data
outputbuffer holding the output data
Returns:
0 if successful

Definition at line 316 of file blowfish.c.

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 
)

Blowfish-CTR buffer encryption/decryption.

Warning: You have to keep the maximum use of your counter in mind!

Parameters:
ctxBlowfish context
lengthThe length of the data
nc_offThe 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.
nonce_counterThe 64-bit nonce and counter.
stream_blockThe saved stream-block for resuming. Is overwritten by the function.
inputThe input data stream
outputThe output data stream
Returns:
0 if successful

Definition at line 364 of file blowfish.c.

int blowfish_crypt_ecb ( blowfish_context *  ctx,
int  mode,
const unsigned char  input[BLOWFISH_BLOCKSIZE],
unsigned char  output[BLOWFISH_BLOCKSIZE] 
)

Blowfish-ECB block encryption/decryption.

Parameters:
ctxBlowfish context
modeBLOWFISH_ENCRYPT or BLOWFISH_DECRYPT
input8-byte input block
output8-byte output block
Returns:
0 if successful

Definition at line 233 of file blowfish.c.

void blowfish_free ( blowfish_context *  ctx )

Clear Blowfish context.

Parameters:
ctxBlowfish context to be cleared

Definition at line 164 of file blowfish.c.

void blowfish_init ( blowfish_context *  ctx )

Initialize Blowfish context.

Parameters:
ctxBlowfish context to be initialized

Definition at line 159 of file blowfish.c.

int blowfish_setkey ( blowfish_context *  ctx,
const unsigned char *  key,
unsigned int  keysize 
)

Blowfish key schedule.

Parameters:
ctxBlowfish context to be initialized
keyencryption key
keysizemust be between 32 and 448 bits
Returns:
0 if successful, or POLARSSL_ERR_BLOWFISH_INVALID_KEY_LENGTH

Definition at line 175 of file blowfish.c.

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