ofb.c File Reference

Output Feedback (OFB) mode. More...

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

Go to the source code of this file.

Macros

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL
 

Functions

error_t ofbEncrypt (const CipherAlgo *cipher, void *context, uint_t s, uint8_t *iv, const uint8_t *p, uint8_t *c, size_t length)
 OFB encryption. More...
 
error_t ofbDecrypt (const CipherAlgo *cipher, void *context, uint_t s, uint8_t *iv, const uint8_t *c, uint8_t *p, size_t length)
 OFB decryption. More...
 

Detailed Description

Output Feedback (OFB) 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 Output Feedback (OFB) mode is a confidentiality mode that features the iteration of the forward cipher on an IV to generate a sequence of output blocks that are exclusive-ORed with the plaintext to produce the ciphertext, and vice versa. The OFB mode requires that the IV is a nonce, i.e., the IV must be unique for each execution of the mode under the given key. Refer to SP 800-38A for more details

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

Definition in file ofb.c.

Macro Definition Documentation

◆ TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 39 of file ofb.c.

Function Documentation

◆ ofbDecrypt()

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

OFB 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 ofb.c.

◆ ofbEncrypt()

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

OFB 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 ofb.c.