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.
Applies the TLS Pseudo-Random-Function (PRF) on the master secret and
the provided data, seeded with the client and server random fields,
as specified in RFC5705.
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 first.
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
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gnutls 3.5.9 gnutls_prf_rfc5705(3)