pher.  <EM>key</EM> should be
a <TT>(VECTOR (UNSIGNED-BYTE 8))</TT>.</P><P>If <EM>padding</EM> is supplied, the specified padding method will be
used by <A HREF="#encrypt" STYLE="symbol">encrypt</A> and <A HREF="#decrypt" STYLE="symbol">decrypt</A> to handle short blocks when the <TT>:HANDLE-FINAL-BLOCK</TT> argument is supplied.  Depending on the mode
specified, <EM>padding</EM> may be ignored (e.g. OFB and CFB modes do not
care about short blocks; neither do stream ciphers).</P><TABLE CLASS="note"><TR><TD