Contributor: ANATOLY PODGORETSKY
unit Crypt32;
{
*************************************************************************
* Name: Crypt32.Pas *
* Description: 32 bits encode/decode module *
* 2^96 variants it is very high to try hack *
* Purpose: Good for encrypting passwors and text *
* Security: avoid use StartKey less than 256 *
* if it use only for internal use you may use default *
* key, but MODIFY unit before compiling *
* Call: Encrypted := Encrypt(InString,StartKey,MultKey,AddKey) *
* Decrypted := Decrypt(InString,StartKey) *
* Parameters: InString = long string (max 2 GB) that need to encrypt *
* decrypt *
* MultKey = MultKey key *
* AddKey = Second key *
* StartKey = Third key *
* (posible use defaults from interface) *
* Return: OutString = result string *
* Editor: Besr viewed with Tab stops = 2, Courier new *
* Started: 01.08.1996 *
* Revision: 22.05.1997 - ver.2.01 converted from Delphi 1 *
* and made all keys as parameters, before only start key *
* Platform: Delphi 2.0, 3.0 *
* work in Delphi 1.0, 2^48 variants, 0..255 strings *
* Author: Anatoly Podgoretsky *
* Base alghoritm from Borland *
* Address: Vahe 4-31, Johvi, Estonia, EE2045, tel. 61-142 *
* kvk@estpak.ee *
* Status: Freeware, but any sponsor help will be appreciated here *
* need to buy books, shareware products, tools etc *
*************************************************************************
* Modified: Supports Delphi 1.0 & 2.0 *
* Overflow checking removed *
* By: Martin Djern誑 *
* e-mail: djernaes@einstein.ot.dk *
* web: einstein.ot.dk/~djernaes *
*************************************************************************
}
interface
const
StartKey = 981; {Start default key}
MultKey = 12674; {Mult default key}
AddKey = 35891; {Add default key}
function Encrypt(const InString:string; StartKey,MultKey,AddKey:Integer): string;
function Decrypt(const InString:string; StartKey,MultKey,AddKey:Integer): string;
implementation
{$R-}
{$Q-}
{*******************************************************
* Standard Encryption algorithm - Copied from Borland *
*******************************************************}
function Encrypt(const InString:string; StartKey,MultKey,AddKey:Integer): string;
var
I : Byte;
begin
Result := '';
for I := 1 to Length(InString) do
begin
Result := Result + CHAR(Byte(InString[I]) xor (StartKey shr 8));
StartKey := (Byte(Result[I]) + StartKey) * MultKey + AddKey;
end;
end;
{*******************************************************
* Standard Decryption algorithm - Copied from Borland *
*******************************************************}
function Decrypt(const InString:string; StartKey,MultKey,AddKey:Integer): string;
var
I : Byte;
begin
Result := '';
for I := 1 to Length(InString) do
begin
Result := Result + CHAR(Byte(InString[I]) xor (StartKey shr 8));
StartKey := (Byte(InString[I]) + StartKey) * MultKey + AddKey;
end;
end;
{$R+}
{$Q+}
end.