Gets the DER encoded OCTET string for the extension value
(<code>extnValue</code>) identified by the passed in oid string.
The <code>oid</code> string is
represented by a set of positive whole number separated
by ".", that means,<br>
<positive whole number>.<positive whole number>.<...>
@param oid the Object Identifier value for the extension.
@return the der encoded octet string of the extension value.
Gets the DER encoded OCTET string for the extension value (<code>extnValue</code>) identified by the passed in oid string. The <code>oid</code> string is represented by a set of positive whole number separated by ".", that means,<br> <positive whole number>.<positive whole number>.<...>
@param oid the Object Identifier value for the extension. @return the der encoded octet string of the extension value.