Note:	This stand-alone Rijndael implementation had to be adpoted
	because the OpenSSL/AES implementation that was previously
	used by Cipher-Packet had become deprecated (in more recent
	versions of OpenSSL).

Note:	This Rijndael implementation came from the FreeBSD-14.4-REL/amd64
	operating system source code tree ("/sys/crypto/rijndael/").
	  It is supposed to be equivalent to the AES algorithm. Since this
	source code was copied from the FreeBSD-14.4 O/S source code tree,
	it is highly likely to be correct/functional. However, I have not
	(yet) tested its equivalence to AES using i.e. AES test-vectors.

Note:	The original source required modification to get it working in place.


-=> A superior solution would be to use the AES instructions found in
    modern CPUs.
