gnutls_prf(3)

NAME
gnutls_prf - API function

SYNOPSIS
#include <gnutls/gnutls.h>

int gnutls_prf(gnutls_session_t session, size_t label_size, const char * label, int server_random_first, size_t extra_size, const char * extra, size_t outsize, char * out);

ARGUMENTS

gnutls_session_t session
    is a gnutls_session_t type.

size_t label_size
    length of the label variable.

const char * label
    label used in PRF computation, typically a short string.

int server_random_first
    non-zero if server random field should be first in seed

size_t extra_size
    length of the extra variable.

const char * extra
    optional extra data to seed the PRF with.

size_t outsize
    size of pre-allocated output buffer to hold the output.

char * out
    pre-allocated buffer to hold the generated data.

DESCRIPTION
Applies the TLS Pseudo-Random-Function (PRF) on the master secret and the provided data, seeded with the client and server random fields. For the key expansion specified in RFC5705 see gnutls_prf_rfc5705(). The label variable usually contains a string denoting the purpose for the generated data. The server_random_first indicates whether the client random field or the server random field should be first in the seed. Non-zero indicates that the server random field is first, 0 that the client random field is first. The extra variable can be used to add more data to the seed, after the random variables. It can be used to make sure the generated output is strongly connected to some additional data (e.g., a string used in user authentication). The output is placed in out , which must be pre-allocated.

NOTE
This function produces identical output with gnutls_prf_rfc5705() when server_random_first is set to 0 and extra is NULL. Under TLS1.3 this function will only operate when these conditions are true, or otherwise return GNUTLS_E_INVALID_REQUEST.

RETURNS
GNUTLS_E_SUCCESS on success, or an error code.

REPORTING BUGS
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org

COPYRIGHT
Copyright © 2001-2019 Free Software Foundation, Inc., and others.
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

SEE ALSO
The full documentation for gnutls is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit

https://www.gnutls.org/manual/