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@deftypefun {int} {gnutls_x509_privkey_export} (gnutls_x509_privkey_t @var{key}, gnutls_x509_crt_fmt_t @var{format}, void * @var{output_data}, size_t * @var{output_data_size})
@var{key}: Holds the key
@var{format}: the format of output params. One of PEM or DER.
@var{output_data}: will contain a private key PEM or DER encoded
@var{output_data_size}: holds the size of output_data (and will be
replaced by the actual size of parameters)
This function will export the private key to a PKCS@code{1} structure for
RSA or RSA-PSS keys, and integer sequence for DSA keys. Other keys types
will be exported in PKCS@code{8} form.
If the structure is PEM encoded, it will have a header
of "BEGIN RSA PRIVATE KEY".
It is recommended to use @code{gnutls_x509_privkey_export_pkcs8()} instead
of this function, when a consistent output format is required.
@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS} (0) is returned, otherwise a
negative error value.
@end deftypefun
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