gnutls_prf_rfc5705 - API function
int gnutls_prf_rfc5705(gnutls_session_t session, size_t
label_size, const char * label, size_t
context_size, const char * context, size_t
outsize, char * out);
- 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.
- size_t context_size
- length of the extra variable.
- const char * context
- 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.
Exports keyring material from TLS/DTLS session to an application, as specified
In the TLS versions prior to 1.3, it applies the TLS Pseudo-Random-Function
(PRF) on the master secret and the provided data, seeded with the client and
server random fields.
In TLS 1.3, it applies HKDF on the exporter master secret derived from the
variable usually contains a string denoting the purpose for the
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
The output is placed in out
, which must be pre-allocated.
Note that, to provide the RFC5705 context, the context
variable must be
on success, or an error code.
Report bugs to <email@example.com>.
Home page: https://www.gnutls.org
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.
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