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gnutls_prf_rfc5705(3) gnutls gnutls_prf_rfc5705(3)
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);
is a gnutls_session_t type.
length of the label variable.
const char * label
label used in PRF computation, typically a short string.
length of the extra variable.
const char * context
optional extra data to seed the PRF with.
size of pre-allocated output buffer to hold the output.
char * out pre-allocated buffer to hold the generated data.
Exports keying material from TLS/DTLS session to an application, as
specified in RFC5705.
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 master secret.
The label variable usually contains a string denoting the purpose for
the generated data.
The context 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
The output is placed in out , which must be pre-allocated.
Note that, to provide the RFC5705 context, the context variable must
GNUTLS_E_SUCCESS on success, or an error code.
Report bugs to <email@example.com>.
Home page: https://www.gnutls.org
Copyright (C) 2001- 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/local/share/doc/gnutls/ directory does not contain the HTML
gnutls 3.6.15 gnutls_prf_rfc5705(3)