Version 1.30  2/10/1990 eay
	Have made des_quad_cksum the same as MIT's the full package
	should be compatable with MIT's
	Have tested on a DECstation 3100
	Still need to fix des_set_key (mkae it faster).
	Does des_cbc_encrypts at 70.5k/sec on a 3100.

Version 1.20 18/09/1990 eay
	Fixed byte order dependacies.
	Fixed (I hope) all the word allignment problems.
	Speedup in des_ecb_encrypt.

Version 1.10 11/09/1990 eay
	Added des_enc_read and des_enc_write.
	Still need to fix des_quad_cksum.
	Still need to document des_enc_read and des_enc_write.

Version 1.00 27/08/1990 eay
