Writes tagged, pre-marshaled data. This calcuates and encodes
the length, so that the output data is the standard triple of
{ tag, length, data } used by all DER values.
@param tag the DER value tag for the data, such as
<em>DerValue.tag_Sequence</em>
@param buf buffered data, which must be DER-encoded
Writes tagged, pre-marshaled data. This calcuates and encodes the length, so that the output data is the standard triple of { tag, length, data } used by all DER values.
@param tag the DER value tag for the data, such as <em>DerValue.tag_Sequence</em> @param buf buffered data, which must be DER-encoded