kmac.c File Reference

KMAC (Keccak Message Authentication Code) More...

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

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Functions
error_t	kmacCompute (uint_t strength, const void *key, size_t keyLen, const void *data, size_t dataLen, const char_t *custom, size_t customLen, uint8_t *mac, size_t macLen)
	Compute KMAC message authentication code. More...
error_t	kmacInit (KmacContext *context, uint_t strength, const void *key, size_t keyLen, const char_t *custom, size_t customLen)
	Initialize KMAC calculation. More...
void	kmacUpdate (KmacContext *context, const void *data, size_t dataLen)
	Update the KMAC context with a portion of the message being hashed. More...
error_t	kmacFinal (KmacContext *context, uint8_t *mac, size_t macLen)
	Finish the KMAC calculation. More...
void	kmacDeinit (KmacContext *context)
	Release KMAC context. More...
void	kmacRightEncode (size_t value, uint8_t *buffer, size_t *length)
	Encode integer as byte string. More...

Variables
const uint8_t	KMAC128_OID [9] = {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x13}
const uint8_t	KMAC256_OID [9] = {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x14}

Detailed Description

KMAC (Keccak Message Authentication Code)

License

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

Copyright (C) 2010-2025 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 Keccak Message Authentication Code (KMAC) algorithm is a PRF and keyed hash function based on Keccak. KMAC has two variants, KMAC128 and KMAC256, built from cSHAKE128 and cSHAKE256, respectively

Author

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

Version

2.5.4

Definition in file kmac.c.

Macro Definition Documentation

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 38 of file kmac.c.

Function Documentation

kmacCompute()

error_t kmacCompute	(	uint_t	strength,
		const void *	key,
		size_t	keyLen,
		const void *	data,
		size_t	dataLen,
		const char_t *	custom,
		size_t	customLen,
		uint8_t *	mac,
		size_t	macLen
	)

Compute KMAC message authentication code.

Parameters

[in]	strength	Number of bits of security (128 for KMAC128 and 256 for KMAC256)
[in]	key	Pointer to the secret key (K)
[in]	keyLen	Length of the secret key
[in]	data	Pointer to the input message (X)
[in]	dataLen	Length of the input data
[in]	custom	Customization string (S)
[in]	customLen	Length of the customization string
[out]	mac	Calculated MAC value
[in]	macLen	Expected length of the MAC (L)

Returns

Error code

Definition at line 68 of file kmac.c.

kmacDeinit()

void kmacDeinit

(

KmacContext *

context

)

Release KMAC context.

Parameters

[in]

context

Pointer to the KMAC context

Definition at line 232 of file kmac.c.

kmacFinal()

error_t kmacFinal	(	KmacContext *	context,
		uint8_t *	mac,
		size_t	macLen
	)

Finish the KMAC calculation.

Parameters

[in]	context	Pointer to the KMAC context
[out]	mac	Calculated MAC value
[in]	macLen	Expected length of the MAC (L)

Returns

Error code

Definition at line 199 of file kmac.c.

kmacInit()

error_t kmacInit	(	KmacContext *	context,
		uint_t	strength,
		const void *	key,
		size_t	keyLen,
		const char_t *	custom,
		size_t	customLen
	)

Initialize KMAC calculation.

Parameters

[in]	context	Pointer to the KMAC context to initialize
[in]	strength	Number of bits of security (128 for KMAC128 and 256 for KMAC256)
[in]	key	Pointer to the secret key (K)
[in]	keyLen	Length of the secret key
[in]	custom	Customization string (S)
[in]	customLen	Length of the customization string

Returns

Error code

Definition at line 121 of file kmac.c.

kmacRightEncode()

void kmacRightEncode	(	size_t	value,
		uint8_t *	buffer,
		size_t *	length
	)

Encode integer as byte string.

Parameters

[in]	value	Value of the integer to be encoded
[out]	buffer	Buffer where to store the byte string representation
[out]	length	Length of the resulting byte string

Definition at line 250 of file kmac.c.

kmacUpdate()

void kmacUpdate	(	KmacContext *	context,
		const void *	data,
		size_t	dataLen
	)

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

Parameters

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

Definition at line 184 of file kmac.c.

Variable Documentation

KMAC128_OID

const uint8_t KMAC128_OID[9] = {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x13}

Definition at line 48 of file kmac.c.

KMAC256_OID

const uint8_t KMAC256_OID[9] = {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x14}

Definition at line 50 of file kmac.c.