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 extra variable.
const char * context
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.
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 user authentication).
The output is placed in out , which must be pre-allocated.
Note that, to provide the RFC5705 context, the context variable
must be non-null.
This page is part of the GnuTLS (GnuTLS Transport Layer Security
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⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to email@example.com. This page was obtained
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gnutls 3.7.2 gnutls_prf_rfc5705(3)