HMAC module implementation file. More...

#include "hmac.h"
#include "memory.h"
#include "security.h"
#include "log_util.h"
#include "string_util.h"
#include "definitions.h"

Include dependency graph for hmac.c:

Go to the source code of this file.

Macros
#define	HMAC_MAXIMUM_KEY_SIZE 64

#define	HMAC_SHA256_SIZE 32

Functions
E_MCL_ERROR_CODE	hmac_sha256 (const mcl_uint8_t data, mcl_size_t data_size, const mcl_uint8_t key, mcl_size_t key_size, mcl_uint8_t *hash, mcl_size_t hash_size)

Variables
static const mcl_uint8_t	hmac_ipad = 0x36

static const mcl_uint8_t	hmac_opad = 0x5C

Detailed Description

HMAC module implementation file.

Copyright: Copyright (C) 2016 Siemens Aktiengesellschaft.
All rights reserved.

Date: Aug 16, 2016

Definition in file hmac.c.

Macro Definition Documentation

#define HMAC_MAXIMUM_KEY_SIZE 64

Definition at line 22 of file hmac.c.

Referenced by hmac_sha256().

#define HMAC_SHA256_SIZE 32

Definition at line 23 of file hmac.c.

Referenced by hmac_sha256().

Function Documentation

E_MCL_ERROR_CODE hmac_sha256	(	const mcl_uint8_t *	data,
		mcl_size_t	data_size,
		const mcl_uint8_t *	key,
		mcl_size_t	key_size,
		mcl_uint8_t **	hash,
		mcl_size_t *	hash_size
	)

Calculates HMAC SHA256 for given data with provided secret key. If secret key exceeds maximum allowed size of 64 bytes it will be reduced to 32 bytes. The reduction is done by calculating SHA256 hash of the key, which returns 32 bytes.

Parameters

[in]	data	Data to calculate HMAC SHA256 for.
[in]	data_size	Size of `data`.
[in]	key	Secret key to be used during calculation.
[in]	key_size	Size of `key`.
[out]	hash	A newly allocated memory which contains the result of HMAC SHA256.
[out]	hash_size	Size of `hash`, which should be 32 bytes after SHA256 calculation.