Section: gnutls (3)
gnutls_prf - API function
int gnutls_prf(gnutls_session_t session, size_t label_size, const char * label, int server_random_first, size_t extra_size, const char * extra, 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.
- int server_random_first
non-zero if server random field should be first in seed
- size_t extra_size
length of the extra variable.
- const char * extra
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.
Applies the TLS Pseudo-Random-Function (PRF) on the master secret
and the provided data, seeded with the client and server random fields.
For the key expansion specified in RFC5705 see gnutls_prf_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 extra 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.
This function produces identical output with gnutls_prf_rfc5705()
is set to 0 and extra
. Under TLS1.3
this function will only operate when these conditions are true, or otherwise
on success, or an error code.
Report bugs to <email@example.com
Home page: https://www.gnutls.org
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