sha1-tprf.c File Reference

SHA1 T-PRF for EAP-FAST. More...

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

Functions
int	sha1_t_prf (const u8 *key, size_t key_len, const char *label, const u8 *seed, size_t seed_len, u8 *buf, size_t buf_len)
	EAP-FAST Pseudo-Random Function (T-PRF) More...

Detailed Description

SHA1 T-PRF for EAP-FAST.

Function Documentation

int sha1_t_prf	(	const u8 *	key,
		size_t	key_len,
		const char *	label,
		const u8 *	seed,
		size_t	seed_len,
		u8 *	buf,
		size_t	buf_len
	)

EAP-FAST Pseudo-Random Function (T-PRF)

Parameters

key	Key for PRF
key_len	Length of the key in bytes
label	A unique label for each purpose of the PRF
seed	Seed value to bind into the key
seed_len	Length of the seed
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 for EAP-FAST. T-PRF is defined in RFC 4851, Section 5.5.