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   gnutls_prf_early    ( 3 )

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/