@deftypefun {int} {gnutls_dh_params_export_pkcs3} (gnutls_dh_params_t @var{params}, gnutls_x509_crt_fmt_t @var{format}, unsigned char * @var{params_data}, size_t * @var{params_data_size})
@var{params}: Holds the DH parameters

@var{format}: the format of output params. One of PEM or DER.

@var{params_data}: will contain a PKCS3 DHParams structure PEM or DER encoded

@var{params_data_size}: holds the size of params_data (and will be replaced by the actual size of parameters)

This function will export the given dh parameters to a PKCS3
DHParams structure. This is the format generated by "openssl dhparam" tool.
If the buffer provided is not long enough to hold the output, then
GNUTLS_E_SHORT_MEMORY_BUFFER will be returned.

If the structure is PEM encoded, it will have a header
of "BEGIN DH PARAMETERS".

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