Функции API (API function)
Имя (Name)
gnutls_prf_early - API function
Синопсис (Synopsis)
#include <gnutls/gnutls.h>
int gnutls_prf_early(gnutls_session_t session, size_t label_size,
const char * label, size_t context_size, const char * context,
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.
size_t context_size
length of the extra variable.
const char * context
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)
This function is similar to gnutls_prf_rfc5705(), but only works
in TLS 1.3 or later to export early keying material.
Note that the keying material is only available after the
ClientHello message is processed and before the application
traffic keys are established. Therefore this function shall be
called in a handshake hook function for
GNUTLS_HANDSHAKE_CLIENT_HELLO.
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.
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/
