sha1-prf.c File Reference

SHA1-based PRF. More...

#include "includes.h"
#include "common.h"
#include "sha1.h"
#include "crypto.h"

Functions
int	sha1_prf (const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len)
	SHA1-based Pseudo-Random Function (PRF) (IEEE 802.11i, 8.5.1.1) More...

Detailed Description

SHA1-based PRF.

Function Documentation

int sha1_prf	(	const u8 *	key,
		size_t	key_len,
		const char *	label,
		const u8 *	data,
		size_t	data_len,
		u8 *	buf,
		size_t	buf_len
	)

SHA1-based Pseudo-Random Function (PRF) (IEEE 802.11i, 8.5.1.1)

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

Returns

0 on success, -1 of failure

This function is used to derive new, cryptographically separate keys from a given key (e.g., PMK in IEEE 802.11i).