Функции API (API function)
Имя (Name)
gnutls_prf - API function
Синопсис (Synopsis)
#include <gnutls/gnutls.h>
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);
Аргументы (Arguments)
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.
Описание (Description)
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.
Примечание (Note)
This function produces identical output with gnutls_prf_rfc5705()
when server_random_first is set to 0 and extra is NULL. Under
TLS1.3 this function will only operate when these conditions are
true, or otherwise return GNUTLS_E_INVALID_REQUEST.
Возвращаемое значение (Return value)
GNUTLS_E_SUCCESS on success, or an error code.
Сообщение об ошибках (Reporting bugs)
Report bugs to <bugs@gnutls.org>.
Home page: https://www.gnutls.org
Смотри также (See also)
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
https://www.gnutls.org/manual/
