From msuinfo!agate!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!news.kei.com!babbage.ece.uc.edu!mary.iia.org!rtp.vnet.net!news1.digex.net!access3!lehimes Wed May  4 23:50:24 1994
Path: msuinfo!agate!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!news.kei.com!babbage.ece.uc.edu!mary.iia.org!rtp.vnet.net!news1.digex.net!access3!lehimes
From: lehimes@access.digex.net (Larry Himes)
Newsgroups: sci.crypt
Subject: Re: DES Implementation Question
Date: 3 May 1994 21:17:42 -0400
Organization: Express Access Online Communications, Greenbelt, MD USA
Lines: 15
Message-ID: <lehimes.768014130@access3>
References: <2pve6o$dta@mojo.eng.umd.edu>
NNTP-Posting-Host: access3.digex.net
Keywords: DES

Here is a quick C-like description of the DES Maintenance Test:

	Let Key = all 0x55;
	Let Input = all 0xFF;
	Let FinalResult = 0x24 0x6E 0x9D 0xB9 0xC5 0x50 0x38 0x1A ;
	for (i = 1 to 64 by 1)	{
	    Let Temp1 = ECB Encryption of Input by Key
	    Let Temp2 = ECB Encryption of Temp1 by Key
	    Let Temp3 = ECB Decryption of Temp1 by Temp2
	    Let Key   = Temp3
	    Let Input = Temp1
	} End for loop;
	if (Temp2 == FinalResult) Pass else Fail;