cfb.c File Reference

Cipher Feedback (CFB) mode. More...

#include "core/crypto.h"
#include "cipher_mode/cfb.h"
#include "debug.h"

Go to the source code of this file.

Macros

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL
 

Functions

error_t cfbEncrypt (const CipherAlgo *cipher, void *context, uint_t s, uint8_t *iv, const uint8_t *p, uint8_t *c, size_t length)
 CFB encryption. More...
 
error_t cfbDecrypt (const CipherAlgo *cipher, void *context, uint_t s, uint8_t *iv, const uint8_t *c, uint8_t *p, size_t length)
 CFB decryption. More...
 

Detailed Description

Cipher Feedback (CFB) mode.

License

Copyright (C) 2010-2018 Oryx Embedded SARL. All rights reserved.

This file is part of CycloneCrypto Open.

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.

Description

The Cipher Feedback (CFB) mode is a confidentiality mode that features the feedback of successive ciphertext segments into the input blocks of the forward cipher to generate output blocks that are exclusive-ORed with the plaintext to produce the ciphertext, and vice versa. The CFB mode requires an IV as the initial input block. The IV need not be secret, but it must be unpredictable. Refer to SP 800-38A for more details

Author
Oryx Embedded SARL (www.oryx-embedded.com)
Version
1.9.0

Definition in file cfb.c.

Macro Definition Documentation

◆ TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 39 of file cfb.c.

Function Documentation

◆ cfbDecrypt()

error_t cfbDecrypt ( const CipherAlgo cipher,
void *  context,
uint_t  s,
uint8_t *  iv,
const uint8_t *  c,
uint8_t *  p,
size_t  length 
)

CFB decryption.

Parameters
[in]cipherCipher algorithm
[in]contextCipher algorithm context
[in]sSize of the plaintext and ciphertext segments
[in,out]ivInitialization vector
[in]cCiphertext to be decrypted
[out]pPlaintext resulting from the decryption
[in]lengthTotal number of data bytes to be decrypted
Returns
Error code

Definition at line 120 of file cfb.c.

◆ cfbEncrypt()

error_t cfbEncrypt ( const CipherAlgo cipher,
void *  context,
uint_t  s,
uint8_t *  iv,
const uint8_t *  p,
uint8_t *  c,
size_t  length 
)

CFB encryption.

Parameters
[in]cipherCipher algorithm
[in]contextCipher algorithm context
[in]sSize of the plaintext and ciphertext segments
[in,out]ivInitialization vector
[in]pPlaintext to be encrypted
[out]cCiphertext resulting from the encryption
[in]lengthTotal number of data bytes to be encrypted
Returns
Error code

Definition at line 62 of file cfb.c.