is a gnutls_session_t type.
length of the label variable.
const char * label
label used in PRF computation, typically a short
non-zero if server random field should be first in
length of the extra variable.
const char * extra
optional extra data to seed the PRF with.
size of pre-allocated output buffer to hold the
char * out pre-allocated buffer to hold the generated data.
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
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
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.
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.
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
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gnutls 3.7.1 gnutls_prf(3)