MODULE CryptoDES;
	IMPORT S := SYSTEM, U := CryptoUtils, Ciphers := CryptoCiphers;
CONST 
	Mask01 = S.VAL(SET32, 2863311530); 
	Mask02 = S.VAL(SET32, 858993459); 
	Mask04 = S.VAL(SET32, 252645135); 
	Mask08 = S.VAL(SET32, 16711935); 
	Mask16 = S.VAL(SET32, 65535); 
TYPE 
	Sandbox = ARRAY 64 OF SET32; 

	BitSwap = ARRAY 16 OF SET32; 

	Ind4* = RECORD 
		a-, b-, c-, d-: LONGINT; 
	END; 

	Cipher* = OBJECT (Ciphers.Cipher)
	VAR 
		ske, skd: ARRAY 32 OF SET32; 
		ki: LONGINT; 
		ivx, ivy: SET32; 

		PROCEDURE ^ InitKey*(CONST src: ARRAY OF CHAR; keybits: LONGINT); 
		PROCEDURE ^ SetIV*(CONST src: ARRAY OF CHAR; mode: SHORTINT); 
		PROCEDURE ^ Encrypt*(VAR buf: ARRAY OF CHAR; ofs, len: LONGINT); 
		PROCEDURE ^ Decrypt*(VAR buf: ARRAY OF CHAR; ofs, len: LONGINT); 
		PROCEDURE ^ RoundE*(VAR x, y: SET32); 
		PROCEDURE ^ RoundD*(VAR x, y: SET32); 
		PROCEDURE ^  & Init*; 
	END Cipher; 
VAR 
	sb1-, sb2-, sb3-, sb4-, sb5-, sb6-, sb7-, sb8-: Sandbox; 
	LHs, RHs: BitSwap; 

	PROCEDURE ^ Split*(x: SET32; VAR i4: Ind4); 
	PROCEDURE ^ NewCipher*(): Ciphers.Cipher; 
	PROCEDURE ^ IP*(VAR x, y: SET32); 
	PROCEDURE ^ FP*(VAR x, y: SET32); 
	PROCEDURE ^ ComputeSubkeys*(x, y: SET32; VAR sk: ARRAY OF SET32; ofs: LONGINT); 
	PROCEDURE ^ InitializeSandboxes; 
BEGIN
END CryptoDES.