is a gnutls_session_t type.
length of the label variable.
const char * label
label used in PRF computation, typically a short
length of the seed variable.
const char * seed
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.
Apply the TLS Pseudo-Random-Function (PRF) on the master secret
and the provided data.
The label variable usually contains a string denoting the
purpose for the generated data. The seed usually contains 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 includes 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 seeds 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.
This function will only operate under TLS versions prior to 1.3.
In TLS1.3 the use of PRF is replaced with HKDF and the generic
exporters like gnutls_prf_rfc5705() should be used instead. Under
TLS1.3 this function returns 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
manual page, send it to firstname.lastname@example.org. This page was obtained
from the tarball gnutls-3.7.2.tar.xz fetched from
⟨http://www.gnutls.org/download.html⟩ on 2021-08-27. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to email@example.com
gnutls 3.7.2 gnutls_prf_raw(3)