Output Feedback (OFB) mode. More...

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

Macros
#define	TRACE_LEVEL CRYPTO_TRACE_LEVEL

Functions
__weak_func 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

SPDX-License-Identifier: GPL-2.0-or-later

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: 2.4.4

Definition in file ofb.c.

Macro Definition Documentation

◆ TRACE_LEVEL

#define TRACE_LEVEL CRYPTO_TRACE_LEVEL

Definition at line 41 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]	cipher	Cipher algorithm
[in]	context	Cipher algorithm context
[in]	s	Size of the plaintext and ciphertext segments
[in,out]	iv	Initialization vector
[in]	c	Ciphertext to be decrypted
[out]	p	Plaintext resulting from the decryption
[in]	length	Total number of data bytes to be decrypted

Returns: Error code

Definition at line 124 of file ofb.c.

◆ ofbEncrypt()

__weak_func 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.