I've got a small application that stores the application data in some files, they seem to be in a group of three (I assume DAT is DATA, NDX some INDEX, and DIA? No idea) This type of format predates my computer experince, so I wonder if there's any older (cough; I mean...
Use DCPcrypt lib from https://sourceforge.net/p/dcpcrypt/code/HEAD/tree/
I took code from: http://keit.co/p/dcpcrypt-hmac-rfc2104/
uses DCPcrypt2, DCPsha1, DCPblockciphers, DCPrijndael;
function RPad(x: ansistring; c: AnsiChar; s: Integer): ansistring; var i: Integer;