@deftypefun {int} {gnutls_x509_ext_import_key_purposes} (const gnutls_datum_t * @var{ext}, gnutls_x509_key_purposes_t @var{p}, unsigned int @var{flags})
@var{ext}: The DER-encoded extension data

@var{p}: The key purposes

@var{flags}: should be zero

This function will extract the key purposes in the provided DER-encoded
ExtKeyUsageSyntax PKIX extension, to a @code{gnutls_x509_key_purposes_t}  type. 
The data must be initialized.

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a negative error value.

@strong{Since:} 3.3.0
@end deftypefun