cmac.c File Reference

CMAC (Cipher-based Message Authentication Code) More...

#include "core/crypto.h"
#include "mac/cmac.h"

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Functions
error_t	cmacCompute (const CipherAlgo *cipher, const void *key, size_t keyLen, const void *data, size_t dataLen, uint8_t *mac, size_t macLen)
	Compute CMAC using the specified cipher algorithm. More...
error_t	cmacInit (CmacContext *context, const CipherAlgo *cipher, const void *key, size_t keyLen)
	Initialize CMAC calculation. More...
void	cmacReset (CmacContext *context)
	Reset CMAC context. More...
void	cmacUpdate (CmacContext *context, const void *data, size_t dataLen)
	Update the CMAC context with a portion of the message being hashed. More...
error_t	cmacFinal (CmacContext *context, uint8_t *mac, size_t macLen)
	Finish the CMAC calculation. More...
void	cmacDeinit (CmacContext *context)
	Release CMAC context. More...
void	cmacMul (uint8_t *x, const uint8_t *a, size_t n, uint8_t rb)
	Multiplication by x in GF(2^128) More...
void	cmacXorBlock (uint8_t *x, const uint8_t *a, const uint8_t *b, size_t n)
	XOR operation. More...

Detailed Description

CMAC (Cipher-based Message Authentication Code)

License

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

Copyright (C) 2010-2024 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

CMAC is a block cipher-based MAC algorithm specified in NIST SP 800-38B

Author

Oryx Embedded SARL (www.oryx-embedded.com)

Version

2.4.4

Definition in file cmac.c.

Macro Definition Documentation

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 36 of file cmac.c.

Function Documentation

cmacCompute()

error_t cmacCompute	(	const CipherAlgo *	cipher,
		const void *	key,
		size_t	keyLen,
		const void *	data,
		size_t	dataLen,
		uint8_t *	mac,
		size_t	macLen
	)

Compute CMAC using the specified cipher algorithm.

Parameters

[in]	cipher	Cipher algorithm used to compute CMAC
[in]	key	Pointer to the secret key
[in]	keyLen	Length of the secret key
[in]	data	Pointer to the input message
[in]	dataLen	Length of the input data
[out]	mac	Calculated MAC value
[in]	macLen	Expected length of the MAC

Returns

Error code

Definition at line 58 of file cmac.c.

cmacDeinit()

void cmacDeinit

(

CmacContext *

context

)

Release CMAC context.

Parameters

[in]

context

Pointer to the CMAC context

Definition at line 296 of file cmac.c.

cmacFinal()

error_t cmacFinal	(	CmacContext *	context,
		uint8_t *	mac,
		size_t	macLen
	)

Finish the CMAC calculation.

Parameters

[in]	context	Pointer to the CMAC context
[out]	mac	Calculated MAC value (optional parameter)
[in]	macLen	Expected length of the MAC

Returns

Error code

Definition at line 237 of file cmac.c.

cmacInit()

error_t cmacInit	(	CmacContext *	context,
		const CipherAlgo *	cipher,
		const void *	key,
		size_t	keyLen
	)

Initialize CMAC calculation.

Parameters

[in]	context	Pointer to the CMAC context to initialize
[in]	cipher	Cipher algorithm used to compute CMAC
[in]	key	Pointer to the secret key
[in]	keyLen	Length of the secret key

Returns

Error code

Definition at line 107 of file cmac.c.

cmacMul()

void cmacMul	(	uint8_t *	x,
		const uint8_t *	a,
		size_t	n,
		uint8_t	rb
	)

Multiplication by x in GF(2^128)

Parameters

[out]	x	Pointer to the output block
[out]	a	Pointer to the input block
[in]	n	Size of the block, in bytes
[in]	rb	Representation of the irreducible binary polynomial

Definition at line 318 of file cmac.c.

cmacReset()

void cmacReset

(

CmacContext *

context

)

Reset CMAC context.

Parameters

[in]

context

Pointer to the CMAC context

Definition at line 172 of file cmac.c.

cmacUpdate()

void cmacUpdate	(	CmacContext *	context,
		const void *	data,
		size_t	dataLen
	)

Update the CMAC context with a portion of the message being hashed.

Parameters

[in]	context	Pointer to the CMAC context
[in]	data	Pointer to the input data
[in]	dataLen	Length of the buffer

Definition at line 191 of file cmac.c.

cmacXorBlock()

void cmacXorBlock	(	uint8_t *	x,
		const uint8_t *	a,
		const uint8_t *	b,
		size_t	n
	)

XOR operation.

Parameters

[out]	x	Block resulting from the XOR operation
[in]	a	First input block
[in]	b	Second input block
[in]	n	Size of the block, in bytes

Definition at line 349 of file cmac.c.