gnutls_prf_raw(3) — Linux manual pages

Linux manual pages	Section 3

Name

gnutls_prf_raw — access the TLS PRF directly

Synopsis

#include <gnutls/gnutls.h>

`int gnutls_prf_raw(`	gnutls_session_t `session`,
	size_t `label_size`,
	const char * `label`,
	size_t `seed_size`,
	const char * `seed`,
	size_t `outsize`,
	char * `out)`;

ARGUMENTS

gnutls_session_t session: is a gnutls_session_t structure.
size_t label_size: length of the label variable.
const char * label: label used in PRF computation, typically a short string.
size_t seed_size: length of the seed variable.
const char * seed: optional extra data to seed the PRF with.
size_t outsize: size of pre−allocated output buffer to hold the output.
char * out: pre−allocate buffer to hold the generated data.

DESCRIPTION

Apply the TLS Pseudo−Random−Function (PRF) using the master secret on some data.

The label variable usually contain a string denoting the purpose for the generated data. The seed usually contain data such as the client and server random, perhaps together with some additional data that is added to guarantee uniqueness of the output for a particular purpose.

Because the output is not guaranteed to be unique for a particular session unless seed include the client random and server random fields (the PRF would output the same data on another connection resumed from the first one), it is not recommended to use this function directly. The gnutls_prf() function seed the PRF with the client and server random fields directly, and is recommended if you want to generate pseudo random data unique for each session.

RETURNS

GNUTLS_E_SUCCESS on success, or an error code.

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