sha256.c File Reference

SHA-256 hash implementation and interface functions. More...

#include "includes.h"
#include "common.h"
#include "sha256.h"
#include "crypto.h"

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Functions
void	hmac_sha256_vector (const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
	HMAC-SHA256 over data vector (RFC 2104).
void	hmac_sha256 (const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac)
	HMAC-SHA256 over data buffer (RFC 2104).
void	sha256_prf (const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len)
	SHA256-based Pseudo-Random Function (IEEE 802.11r, 8.5.1.5.2).

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Detailed Description

SHA-256 hash implementation and interface functions.

Copyright

Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

Alternatively, this software may be distributed under the terms of BSD license.

See README and COPYING for more details.

Definition in file sha256.c.

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Function Documentation

void hmac_sha256	(	const u8 *	key,
		size_t	key_len,
		const u8 *	data,
		size_t	data_len,
		u8 *	mac
	)

HMAC-SHA256 over data buffer (RFC 2104).

Parameters:

	key	Key for HMAC operations
	key_len	Length of the key in bytes
	data	Pointers to the data area
	data_len	Length of the data area
	mac	Buffer for the hash (20 bytes)

Definition at line 105 of file sha256.c.

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void hmac_sha256_vector	(	const u8 *	key,
		size_t	key_len,
		size_t	num_elem,
		const u8 *	addr[],
		const size_t *	len,
		u8 *	mac
	)

HMAC-SHA256 over data vector (RFC 2104).

Parameters:

	key	Key for HMAC operations
	key_len	Length of the key in bytes
	num_elem	Number of elements in the data vector
	addr	Pointers to the data areas
	len	Lengths of the data blocks
	mac	Buffer for the hash (32 bytes)

Definition at line 33 of file sha256.c.

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void sha256_prf	(	const u8 *	key,
		size_t	key_len,
		const char *	label,
		const u8 *	data,
		size_t	data_len,
		u8 *	buf,
		size_t	buf_len
	)

SHA256-based Pseudo-Random Function (IEEE 802.11r, 8.5.1.5.2).

Parameters:

	key	Key for PRF
	key_len	Length of the key in bytes
	label	A unique label for each purpose of the PRF
	data	Extra data to bind into the key
	data_len	Length of the data
	buf	Buffer for the generated pseudo-random key
	buf_len	Number of bytes of key to generate

This function is used to derive new, cryptographically separate keys from a given key.

Definition at line 126 of file sha256.c.

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