sha256-tlsprf.c File Reference

TLS PRF P_SHA256. More...

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

Functions
void	tls_prf_sha256 (const u8 *secret, size_t secret_len, const char *label, const u8 *seed, size_t seed_len, u8 *out, size_t outlen)
	Pseudo-Random Function for TLS v1.2 (P_SHA256, RFC 5246) More...

Detailed Description

TLS PRF P_SHA256.

Function Documentation

void tls_prf_sha256	(	const u8 *	secret,
		size_t	secret_len,
		const char *	label,
		const u8 *	seed,
		size_t	seed_len,
		u8 *	out,
		size_t	outlen
	)

Pseudo-Random Function for TLS v1.2 (P_SHA256, RFC 5246)

Parameters

secret	Key for PRF
secret_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
out	Buffer for the generated pseudo-random key
outlen	Number of bytes of key to generate

Returns

0 on success, -1 on failure.

This function is used to derive new, cryptographically separate keys from a given key in TLS. This PRF is defined in RFC 2246, Chapter 5.