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@deftypefun {int} {gnutls_x509_ext_export_key_purposes} (gnutls_x509_key_purposes_t @var{p}, gnutls_datum_t * @var{ext})
@var{p}: The key purposes structure
@var{ext}: The DER-encoded extension data; must be freed using @code{gnutls_free()} .
This function will convert the key purposes structure to a
DER-encoded PKIX ExtKeyUsageSyntax (2.5.29.37) extension. The output data in
@code{ext} will be allocated usin @code{gnutls_malloc()} .
@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS} (0) is returned, otherwise a negative error value.
@strong{Since:} 3.3.0
@end deftypefun
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