{******************************************************************}
{          MD5 Hashsum Evaluation Unit For Borland Delphi          }
{                                                                  }
{          Copyright ? 2002 by Dimka Maslov                        }
{          E-mail:   mail@endimus.com,                             }
{          Web-site: http://www.endimus.com                        }
{                                                                  }
{         Derived from the RSA Data Security, Inc.                 }
{         MD5 Message-Digest Algorithm described in RFC 1321       }
{         http://www.faqs.org/rfcs/rfc1321.html                    }
{******************************************************************}

unit MD5Unit;

interface

uses Windows, SysUtils, Classes;

type
{ The TMD5Digest record is the type of results of
  the MD5 hashsum evaluation functions. The contents
  of a record may be used as four 32-bit integer values
  or as an array of 16 bytes }
 PMD5Digest = ^TMD5Digest;
 TMD5Digest = record
  case Integer of
   0: (A, B, C, D: LongInt);
   1: (v: array [0..15] of Byte);
 end;

{ The MD5String function evaluates the MD5 hashsum for
  a string. The S parameter specifies a string to
  evaluate hashsum }
procedure MD5String(const S: string;PMD5:PMD5Digest);

{ The MD5File function evaluates the MD5 hashsum for
  a file. The FileName parameter specifies the name
  of a file to evaluate hashsum }
procedure MD5File(const FileName: string;PMD5:PMD5Digest);

{ The MD5Stream function evaluates the MD5 hashsum for
  a stream. The Stream parameters specifies the
  TStream descendant class object to evaluate hashsum }
procedure MD5Stream(const Stream: TStream;PMD5:PMD5Digest);

{ The MD5Buffer function evaluates the MD5 hashsum for
  any memory buffer. The Buffer parameters specifies a
  buffer to evaluate hashsum. The Size parameter specifies
  the size (in bytes) of a buffer }
procedure MD5Buffer(const Buffer; Size: Integer;PMD5:PMD5Digest);

{ The MD5DigestToStr function converts the result of
  a hashsum evaluation function into a string of
  hexadecimal digits }
function MD5DigestToStr(const Digest: TMD5Digest): string;

{ The MD5DigestCompare function compares two
  TMD5Digest record variables. This function returns
  TRUE if parameters are equal or FALSE otherwise }
function MD5DigestCompare(const Digest1, Digest2: TMD5Digest): Boolean;

implementation

{
Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.

License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.

License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.

RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.

These notices must be retained in any copies of any part of this
documentation and/or software.
}


type
 UINT4 = LongWord;

 PArray4UINT4 = ^TArray4UINT4;
 TArray4UINT4 = array [0..3] of UINT4;
 PArray2UINT4 = ^TArray2UINT4;
 TArray2UINT4 = array [0..1] of UINT4;
 PArray16Byte = ^TArray16Byte;
 TArray16Byte = array [0..15] of Byte;
 PArray64Byte = ^TArray64Byte;
 TArray64Byte = array [0..63] of Byte;

 PByteArray = ^TByteArray;
 TByteArray = array [0..0] of Byte;

 PUINT4Array = ^TUINT4Array;
 TUINT4Array = array [0..0] of UINT4;

 PMD5Context = ^TMD5Context;
 TMD5Context = record
   state: TArray4UINT4;
   count: TArray2UINT4;
   buffer: TArray64Byte;
 end;

const
  S11 = 7;
  S12 = 12;
  S13 = 17;
  S14 = 22;
  S21 = 5;
  S22 = 9;
  S23 = 14;
  S24 = 20;
  S31 = 4;
  S32 = 11;
  S33 = 16;
  S34 = 23;
  S41 = 6;
  S42 = 10;
  S43 = 15;
  S44 = 21;

var
 Padding : TArray64Byte =
 ($80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);


function _F(x, y, z: UINT4): UINT4;
begin
 Result := (((x) and (y)) or ((not x) and (z)));
end;

function _G(x, y, z: UINT4): UINT4;
begin
 Result := (((x) and (z)) or ((y) and (not z)));
end;

function _H(x, y, z: UINT4): UINT4;
begin
 Result := ((x) xor (y) xor (z));
end;

function _I(x, y, z: UINT4): UINT4;
begin
 Result := ((y) xor ((x) or ( not z)));
end;

function ROTATE_LEFT(x, n: UINT4): UINT4;
begin
 Result := (((x) shl (n)) or ((x) shr (32-(n))));
end;

procedure FF(var a: UINT4; b, c, d, x, s, ac: UINT4);
begin
  a := a + _F(b, c, d) + x + ac;
  a := ROTATE_LEFT (a, s);
  a := a + b;
end;

procedure GG(var a: UINT4; b, c, d, x, s, ac: UINT4);
begin
 a := a + _G(b, c, d) + x + ac;
 a := ROTATE_LEFT(a, s);
 a := a + b;
end;

procedure HH(var a: UINT4; b, c, d, x, s, ac: UINT4);
begin
 a := a + _H(b, c, d) + x + ac;
 a := ROTATE_LEFT(a, s);
 a := a + b;
end;

procedure II(var a: UINT4; b, c, d, x, s, ac: UINT4);
begin
 a := a + _I(b, c, d) + x + ac;
 a := ROTATE_LEFT(a, s);
 a := a + b;
end;

procedure MD5Encode(Output: PByteArray; Input: PUINT4Array; Len: LongWord);
var
 i, j: LongWord;
begin
 j:=0;
 i:=0;
 while j < Len do  begin
  output[j] := Byte(input[i] and $ff);
  output[j+1] := Byte((input[i] shr 8) and $ff);
  output[j+2] := Byte((input[i] shr 16) and $ff);
  output[j+3] := Byte((input[i] shr 24) and $ff);
  Inc(j, 4);
  Inc(i);
 end;
end;

procedure MD5Decode(Output: PUINT4Array; Input: PByteArray; Len: LongWord);
var
 i, j: LongWord;
begin
 j:=0;
 i:=0;
 while j < Len do begin
  Output[i] := UINT4(input[j]) or (UINT4(input[j+1]) shl 8) or
   (UINT4(input[j+2]) shl 16) or ( UINT4(input[j+3]) shl 24);
  Inc(j, 4);
  Inc(i);
 end;
end;

procedure MD5_memcpy(Output: PByteArray; Input: PByteArray; Len: LongWord);
begin
 Move(Input^, Output^, Len);
end;

procedure MD5_memset(Output: PByteArray; Value: Integer; Len: LongWord);
begin
 FillChar(Output^, Len, Byte(Value));
end;

procedure MD5Transform(State: PArray4UINT4; Buffer: PArray64Byte);
var
 a, b, c, d: UINT4;
 x : array[0..15] of UINT4;
begin
 a:=State[0]; b:=State[1]; c:=State[2]; d:=State[3];
 MD5Decode(PUINT4Array(@x), PByteArray(Buffer), 64);

 FF (a, b, c, d, x[ 0], S11, $d76aa478);
 FF (d, a, b, c, x[ 1], S12, $e8c7b756);
 FF (c, d, a, b, x[ 2], S13, $242070db);
 FF (b, c, d, a, x[ 3], S14, $c1bdceee);
 FF (a, b, c, d, x[ 4], S11, $f57c0faf);
 FF (d, a, b, c, x[ 5], S12, $4787c62a);
 FF (c, d, a, b, x[ 6], S13, $a8304613);
 FF (b, c, d, a, x[ 7], S14, $fd469501);
 FF (a, b, c, d, x[ 8], S11, $698098d8);
 FF (d, a, b, c, x[ 9], S12, $8b44f7af);
 FF (c, d, a, b, x[10], S13, $ffff5bb1);
 FF (b, c, d, a, x[11], S14, $895cd7be);
 FF (a, b, c, d, x[12], S11, $6b901122);
 FF (d, a, b, c, x[13], S12, $fd987193);
 FF (c, d, a, b, x[14], S13, $a679438e);
 FF (b, c, d, a, x[15], S14, $49b40821);

 GG (a, b, c, d, x[ 1], S21, $f61e2562);
 GG (d, a, b, c, x[ 6], S22, $c040b340);
 GG (c, d, a, b, x[11], S23, $265e5a51);
 GG (b, c, d, a, x[ 0], S24, $e9b6c7aa);
 GG (a, b, c, d, x[ 5], S21, $d62f105d);
 GG (d, a, b, c, x[10], S22,  $2441453);
 GG (c, d, a, b, x[15], S23, $d8a1e681);
 GG (b, c, d, a, x[ 4], S24, $e7d3fbc8);
 GG (a, b, c, d, x[ 9], S21, $21e1cde6);
 GG (d, a, b, c, x[14], S22, $c33707d6);
 GG (c, d, a, b, x[ 3], S23, $f4d50d87);

 GG (b, c, d, a, x[ 8], S24, $455a14ed);
 GG (a, b, c, d, x[13], S21, $a9e3e905);
 GG (d, a, b, c, x[ 2], S22, $fcefa3f8);
 GG (c, d, a, b, x[ 7], S23, $676f02d9);
 GG (b, c, d, a, x[12], S24, $8d2a4c8a);

 HH (a, b, c, d, x[ 5], S31, $fffa3942);
 HH (d, a, b, c, x[ 8], S32, $8771f681);
 HH (c, d, a, b, x[11], S33, $6d9d6122);
 HH (b, c, d, a, x[14], S34, $fde5380c);
 HH (a, b, c, d, x[ 1], S31, $a4beea44);
 HH (d, a, b, c, x[ 4], S32, $4bdecfa9);
 HH (c, d, a, b, x[ 7], S33, $f6bb4b60);
 HH (b, c, d, a, x[10], S34, $bebfbc70);
 HH (a, b, c, d, x[13], S31, $289b7ec6);
 HH (d, a, b, c, x[ 0], S32, $eaa127fa);
 HH (c, d, a, b, x[ 3], S33, $d4ef3085);
 HH (b, c, d, a, x[ 6], S34,  $4881d05);
 HH (a, b, c, d, x[ 9], S31, $d9d4d039);
 HH (d, a, b, c, x[12], S32, $e6db99e5);
 HH (c, d, a, b, x[15], S33, $1fa27cf8);
 HH (b, c, d, a, x[ 2], S34, $c4ac5665);

 II (a, b, c, d, x[ 0], S41, $f4292244);
 II (d, a, b, c, x[ 7], S42, $432aff97);
 II (c, d, a, b, x[14], S43, $ab9423a7);
 II (b, c, d, a, x[ 5], S44, $fc93a039);
 II (a, b, c, d, x[12], S41, $655b59c3);
 II (d, a, b, c, x[ 3], S42, $8f0ccc92);
 II (c, d, a, b, x[10], S43, $ffeff47d);
 II (b, c, d, a, x[ 1], S44, $85845dd1);
 II (a, b, c, d, x[ 8], S41, $6fa87e4f);
 II (d, a, b, c, x[15], S42, $fe2ce6e0);
 II (c, d, a, b, x[ 6], S43, $a3014314);
 II (b, c, d, a, x[13], S44, $4e0811a1);
 II (a, b, c, d, x[ 4], S41, $f7537e82);
 II (d, a, b, c, x[11], S42, $bd3af235);
 II (c, d, a, b, x[ 2], S43, $2ad7d2bb);
 II (b, c, d, a, x[ 9], S44, $eb86d391);

 Inc(State[0], a);
 Inc(State[1], b);
 Inc(State[2], c);
 Inc(State[3], d);

 MD5_memset (PByteArray(@x), 0, SizeOf (x));
end;


procedure MD5Init(var Context: TMD5Context);
begin
 FillChar(Context, SizeOf(Context), 0);
 Context.state[0] := $67452301;
 Context.state[1] := $efcdab89;
 Context.state[2] := $98badcfe;
 Context.state[3] := $10325476;
end;

procedure MD5Update(var Context: TMD5Context; Input: PByteArray; InputLen: LongWord);
var
 i, index, partLen: LongWord;

begin
 index := LongWord( (context.count[0] shr 3) and $3F);
 Inc(Context.count[0], UINT4(InputLen) shl 3);
 if Context.count[0] < UINT4(InputLen) shl 3 then Inc(Context.count[1]);
 Inc(Context.count[1], UINT4(InputLen) shr 29);
 partLen := 64 - index;
 if inputLen >= partLen then begin
  MD5_memcpy(PByteArray(@Context.buffer[index]), Input, PartLen);
  MD5Transform(@Context.state, @Context.buffer);
  i := partLen;
  while i + 63 < inputLen do begin
   MD5Transform(@Context.state, PArray64Byte(@Input[i]));
   Inc(i, 64);
  end;
  index := 0;
 end else i:=0;
 MD5_memcpy(PByteArray(@Context.buffer[index]), PByteArray(@Input[i]), inputLen - i);
end;


procedure MD5Final(Digest: PMD5Digest; var Context: TMD5Context);
var
 bits: array [0..7] of Byte;
 index, padLen: LongWord;
begin
 MD5Encode(PByteArray(@bits), PUINT4Array(@Context.count), 8);
 index := LongWord( (Context.count[0] shr 3) and $3F);
 if index < 56 then padLen := 56 - index else padLen := 120 - index;
 MD5Update(Context, PByteArray(@PADDING), padLen);
 MD5Update(Context, PByteArray(@Bits), 8);
 MD5Encode(PByteArray(Digest), PUINT4Array(@Context.state), 16);
 MD5_memset(PByteArray(@Context), 0, SizeOf(Context));
end;

function MD5DigestToStr(const Digest: TMD5Digest): string;
var
 i: Integer;
begin
 Result:=‘‘;
 for i:=0 to 15 do Result:=Result+IntToHex(Digest.v[i], 2);
end;

procedure MD5String(const S: string;PMD5:PMD5Digest);
begin
 MD5Buffer(PChar(S)^, Length(S),PMD5);
end;

procedure MD5File(const FileName: string;PMD5:PMD5Digest);
var
  F: TFileStream;
begin
  F:=TFileStream.Create(FileName, fmOpenRead);
  try
    MD5Stream(F,PMD5);
  finally
    F.Free;
  end;
end;

procedure MD5Stream(const Stream: TStream;PMD5:PMD5Digest);
var
 Context: TMD5Context;
 Buffer: array[0..4095] of Byte;
 Size: Integer;
 ReadBytes : Integer;
 TotalBytes : Integer;
 SavePos: Integer;
begin
 MD5Init(Context);
 Size:=Stream.Size;
 SavePos:=Stream.Position;
 TotalBytes:=0;
 try
  Stream.Seek(0, soFromBeginning);
  repeat
   ReadBytes:=Stream.Read(Buffer, SizeOf(Buffer));
   Inc(TotalBytes, ReadBytes);
   MD5Update(Context, @Buffer, ReadBytes);
  until (ReadBytes = 0) or (TotalBytes = Size);
 finally
  Stream.Seek(SavePos, soFromBeginning);
 end;
 MD5Final(PMD5, Context);
end;

procedure MD5Buffer(const Buffer; Size: Integer;PMD5:PMD5Digest);
var
  Context: TMD5Context;
begin
  MD5Init(Context);
  MD5Update(Context, PByteArray(@Buffer), Size);
  MD5Final(PMD5, Context);
end;

function MD5DigestCompare(const Digest1, Digest2: TMD5Digest): Boolean;
begin
  Result:=False;
  if Digest1.A <> Digest2.A then Exit;
  if Digest1.B <> Digest2.B then Exit;
  if Digest1.C <> Digest2.C then Exit;
  if Digest1.D <> Digest2.D then Exit;
  Result:=True;
end;

end.

unit StandardDES;
interface

uses
   Windows, Classes, SysUtils;

type
   fdArray   = array of dword;

   function EncryStr(Str, Key: String): String;overload;
   function EncryStr(Str:TStream; Key: String): String;overload;
   function DecryStr(Str, Key: String): String;overload;
   function DecryStr(Str:TStream; Key: String): String;overload;
   function EncryStrHex(Str, Key: String): String;
   function DecryStrHex(Str, Key: String): String;overload;
   function DecryStrHex(Str:TStream; Key: String): String;overload;

   function des(key:string;smessage:string;encrypt:dword;mode:dword;iv:string):string;
   function des_createKeys(key:string):fdArray;
   function StrToHex(Str:string):string;
   function HexToStr(Hex:string):string;
   function IsInt(Str:String):Boolean;

implementation

function EncryStr(Str, Key: String): String;
begin
   Result := des(Key, Str, 1, 0, ‘‘);
end;

function EncryStr(Str:TStream; Key: String): String;
var
   AStr:String;
begin
   Str.Seek(0,soFromBeginning);
   setlength(AStr, Str.Size);
   Str.Read(AStr[1], Str.Size);
   Result := des(Key, AStr, 1, 0, ‘‘);
end;

function DecryStr(Str, Key: String): String;
begin
   Result := trim(des(Key, Str, 0, 0, ‘‘));
end;

function DecryStr(Str:TStream; Key: String): String;
var
   AStr:String;
begin
   Str.Seek(0,soFromBeginning);
   setlength(AStr, Str.Size);
   Str.Read(AStr[1], Str.Size);
   Result := trim(des(Key, AStr, 0, 0, ‘‘));
end;

function EncryStrHex(Str, Key: String): String;
begin
   Result := trim(StrToHex(des(Key, Str, 1, 0, ‘‘)));
end;

function DecryStrHex(Str, Key: String): String;
begin
   Result := trim(des(Key, HexToStr(Str), 0, 0, ‘‘));
end;

function DecryStrHex(Str:TStream; Key: String): String;
var
   AStr:String;
begin
   Str.Seek(0,soFromBeginning);
   setlength(AStr, Str.Size);
   Str.Read(AStr[1], Str.Size);
   Result := trim(des(Key, HexToStr(AStr), 0, 0, ‘‘));
end;

function des(key:string;smessage:string;encrypt:dword;mode:dword;iv:string):string;
const
   spfunction1 : array[0..63] of dword = ($1010400,0,$10000,$1010404,$1010004,$10404,$4,$10000,$400,$1010400,$1010404,$400,$1000404,$1010004,$1000000,$4,$404,$1000400,$1000400,$10400,$10400,$1010000,$1010000,$1000404,$10004,$1000004,$1000004,$10004,0,$404,$10404,$1000000,$10000,$1010404,$4,$1010000,$1010400,$1000000,$1000000,$400,$1010004,$10000,$10400,$1000004,$400,$4,$1000404,$10404,$1010404,$10004,$1010000,$1000404,$1000004,$404,$10404,$1010400,$404,$1000400,$1000400,0,$10004,$10400,0,$1010004);
   spfunction2 : array[0..63] of dword = ($80108020,$80008000,$8000,$108020,$100000,$20,$80100020,$80008020,$80000020,$80108020,$80108000,$80000000,$80008000,$100000,$20,$80100020,$108000,$100020,$80008020,0,$80000000,$8000,$108020,$80100000,$100020,$80000020,0,$108000,$8020,$80108000,$80100000,$8020,0,$108020,$80100020,$100000,$80008020,$80100000,$80108000,$8000,$80100000,$80008000,$20,$80108020,$108020,$20,$8000,$80000000,$8020,$80108000,$100000,$80000020,$100020,$80008020,$80000020,$100020,$108000,0,$80008000,$8020,$80000000,$80100020,$80108020,$108000);
   spfunction3 : array[0..63] of dword = ($208,$8020200,0,$8020008,$8000200,0,$20208,$8000200,$20008,$8000008,$8000008,$20000,$8020208,$20008,$8020000,$208,$8000000,$8,$8020200,$200,$20200,$8020000,$8020008,$20208,$8000208,$20200,$20000,$8000208,$8,$8020208,$200,$8000000,$8020200,$8000000,$20008,$208,$20000,$8020200,$8000200,0,$200,$20008,$8020208,$8000200,$8000008,$200,0,$8020008,$8000208,$20000,$8000000,$8020208,$8,$20208,$20200,$8000008,$8020000,$8000208,$208,$8020000,$20208,$8,$8020008,$20200);
   spfunction4 : array[0..63] of dword = ($802001,$2081,$2081,$80,$802080,$800081,$800001,$2001,0,$802000,$802000,$802081,$81,0,$800080,$800001,$1,$2000,$800000,$802001,$80,$800000,$2001,$2080,$800081,$1,$2080,$800080,$2000,$802080,$802081,$81,$800080,$800001,$802000,$802081,$81,0,0,$802000,$2080,$800080,$800081,$1,$802001,$2081,$2081,$80,$802081,$81,$1,$2000,$800001,$2001,$802080,$800081,$2001,$2080,$800000,$802001,$80,$800000,$2000,$802080);
   spfunction5 : array[0..63] of dword = ($100,$2080100,$2080000,$42000100,$80000,$100,$40000000,$2080000,$40080100,$80000,$2000100,$40080100,$42000100,$42080000,$80100,$40000000,$2000000,$40080000,$40080000,0,$40000100,$42080100,$42080100,$2000100,$42080000,$40000100,0,$42000000,$2080100,$2000000,$42000000,$80100,$80000,$42000100,$100,$2000000,$40000000,$2080000,$42000100,$40080100,$2000100,$40000000,$42080000,$2080100,$40080100,$100,$2000000,$42080000,$42080100,$80100,$42000000,$42080100,$2080000,0,$40080000,$42000000,$80100,$2000100,$40000100,$80000,0,$40080000,$2080100,$40000100);
   spfunction6 : array[0..63] of dword = ($20000010,$20400000,$4000,$20404010,$20400000,$10,$20404010,$400000,$20004000,$404010,$400000,$20000010,$400010,$20004000,$20000000,$4010,0,$400010,$20004010,$4000,$404000,$20004010,$10,$20400010,$20400010,0,$404010,$20404000,$4010,$404000,$20404000,$20000000,$20004000,$10,$20400010,$404000,$20404010,$400000,$4010,$20000010,$400000,$20004000,$20000000,$4010,$20000010,$20404010,$404000,$20400000,$404010,$20404000,0,$20400010,$10,$4000,$20400000,$404010,$4000,$400010,$20004010,0,$20404000,$20000000,$400010,$20004010);
   spfunction7 : array[0..63] of dword = ($200000,$4200002,$4000802,0,$800,$4000802,$200802,$4200800,$4200802,$200000,0,$4000002,$2,$4000000,$4200002,$802,$4000800,$200802,$200002,$4000800,$4000002,$4200000,$4200800,$200002,$4200000,$800,$802,$4200802,$200800,$2,$4000000,$200800,$4000000,$200800,$200000,$4000802,$4000802,$4200002,$4200002,$2,$200002,$4000000,$4000800,$200000,$4200800,$802,$200802,$4200800,$802,$4000002,$4200802,$4200000,$200800,0,$2,$4200802,0,$200802,$4200000,$800,$4000002,$4000800,$800,$200002);
   spfunction8 : array[0..63] of dword = ($10001040,$1000,$40000,$10041040,$10000000,$10001040,$40,$10000000,$40040,$10040000,$10041040,$41000,$10041000,$41040,$1000,$40,$10040000,$10000040,$10001000,$1040,$41000,$40040,$10040040,$10041000,$1040,0,0,$10040040,$10000040,$10001000,$41040,$40000,$41040,$40000,$10041000,$1000,$40,$10040040,$1000,$41040,$10001000,$40,$10000040,$10040000,$10040040,$10000000,$40000,$10001040,0,$10041040,$40040,$10000040,$10040000,$10001000,$10001040,0,$10041040,$41000,$41000,$1040,$1040,$40040,$10000000,$10041000);
var
   keys:fdArray;
   m, i, j:integer;
   temp, temp2, right1, right2, left, right:dword;
   looping:array of integer;
   cbcleft, cbcleft2, cbcright, cbcright2:dword;
   endloop, loopinc:integer;
   len, iterations:integer;
   chunk:integer;
   tempresult:string;
begin
   //create the 16 or 48 subkeys we will need
   keys := des_createKeys(key);
   m:=0;cbcleft:=0;cbcleft2:=0;cbcright:=0;cbcright2:=0;chunk:=0;
   len := length(smessage);
   //set up the loops for single and triple des
   if length(keys) = 32 then
     iterations := 3
   else
     iterations := 9;

   if iterations = 3 then
     begin
       if encrypt = 1 then
         begin
           setlength(looping,3);
           looping[0] := 0;
           looping[1] := 32;
           looping[2] := 2;
         end
       else
         begin
           setlength(looping,3);
           looping[0] := 30;
           looping[1] := -2;
           looping[2] := -2;
         end;
     end
   else
     begin
       if encrypt = 1 then
         begin
           setlength(looping,9);
           looping[0] := 0;
           looping[1] := 32;
           looping[2] := 2;
           looping[3] := 62;
           looping[4] := 30;
           looping[5] := -2;
           looping[6] := 64;
           looping[7] := 96;
           looping[8] := 2;
         end
       else
         begin
           setlength(looping,9);
           looping[0] := 94;
           looping[1] := 62;
           looping[2] := -2;
           looping[3] := 32;
           looping[4] := 64;
           looping[5] := 2;
           looping[6] := 30;
           looping[7] := -2;
           looping[8] := -2;
         end;
     end;

   smessage := smessage + #0#0#0#0#0#0#0#0; //pad the message out with null bytes

   //store the result here
   result := ‘‘;
   tempresult := ‘‘;

   if mode = 1 then //CBC mode
     begin
       cbcleft := (ord(iv[m+1]) shl 24) or (ord(iv[m+2]) shl 16) or (ord(iv[m+3]) shl 8) or ord(iv[m+4]);
       cbcright := (ord(iv[m+5]) shl 24) or (ord(iv[m+6]) shl 16) or (ord(iv[m+7]) shl 8) or ord(iv[m+8]);
       m:=0;
     end;

   //loop through each 64 bit chunk of the message
   while m < len do
     begin
       left := (ord(smessage[m+1]) shl 24) or (ord(smessage[m+2]) shl 16) or (ord(smessage[m+3]) shl 8) or ord(smessage[m+4]);
       right := (ord(smessage[m+5]) shl 24) or (ord(smessage[m+6]) shl 16) or (ord(smessage[m+7]) shl 8) or ord(smessage[m+8]);
       m := m + 8;

       //for Cipher Block Chaining mode, xor the message with the previous result
       if mode = 1 then
         if encrypt=1 then
           begin
             left := left xor cbcleft;
             right := right xor cbcright;
           end
         else
           begin
             cbcleft2 := cbcleft;
             cbcright2 := cbcright;
             cbcleft := left;
             cbcright := right;
           end;

       //first each 64 but chunk of the message must be permuted according to IP
       temp := ((left shr 4) xor right) and $0f0f0f0f; right := right xor temp; left := left xor (temp shl 4);
       temp := ((left shr 16) xor right) and $0000ffff; right := right xor temp; left := left xor (temp shl 16);
       temp := ((right shr 2) xor left) and $33333333; left := left xor temp; right := right xor (temp shl 2);
       temp := ((right shr 8) xor left) and $00ff00ff; left := left xor temp; right := right xor (temp shl 8);
       temp := ((left shr 1) xor right) and $55555555; right := right xor temp; left := left xor (temp shl 1);

       left := ((left shl 1) or (left shr 31));
       right := ((right shl 1) or (right shr 31));

       //do this either 1 or 3 times for each chunk of the message
       j:=0;
       while j<iterations do
         begin
           endloop := looping[j+1];
           loopinc := looping[j+2];
           //now go through and perform the encryption or decryption
           i:= looping[j];
           while i<>endloop do
             begin
               right1 := right xor keys[i];
               right2 := ((right shr 4) or (right shl 28)) xor keys[i+1];
               //the result is attained by passing these bytes through the S selection functions
               temp := left;
               left := right;
               right := temp xor (spfunction2[(right1 shr 24) and $3f] or spfunction4[(right1 shr 16) and $3f]
                        or spfunction6[(right1 shr   8) and $3f] or spfunction8[right1 and $3f]
                        or spfunction1[(right2 shr 24) and $3f] or spfunction3[(right2 shr 16) and $3f]
                        or spfunction5[(right2 shr   8) and $3f] or spfunction7[right2 and $3f]);
               i:=i+loopinc;
             end;
           temp := left; left := right; right := temp; //unreverse left and right
           j:=j+3;
         end; //for either 1 or 3 iterations

       //move then each one bit to the right
       left := ((left shr 1) or (left shl 31));
       right := ((right shr 1) or (right shl 31));

       //now perform IP-1, which is IP in the opposite direction
       temp := ((left shr 1) xor right) and $55555555; right := right xor temp; left :=left xor (temp shl 1);
       temp := ((right shr 8) xor left) and $00ff00ff; left := left xor temp; right := right xor (temp shl 8);
       temp := ((right shr 2) xor left) and $33333333; left := left xor temp; right := right xor (temp shl 2);
       temp := ((left shr 16) xor right) and $0000ffff; right := right xor temp; left := left xor (temp shl 16);
       temp := ((left shr 4) xor right) and $0f0f0f0f; right := right xor temp; left := left xor (temp shl 4);

       //for Cipher Block Chaining mode, xor the message with the previous result
       if mode = 1 then
         if encrypt=1 then
           begin
           cbcleft := left; cbcright := right;
           end
         else
           begin
             left :=left xor cbcleft2;
             right := right xor cbcright2;
           end;

       tempresult := tempresult + chr(left shr 24) + chr((left shr 16) and $ff) + chr((left shr 8) and $ff) + chr(left and $ff) + chr(right shr 24) + chr((right shr 16) and $ff) + chr((right shr 8) and $ff) + chr(right and $ff);

       chunk := chunk + 8;
       if chunk = 512 then
         begin
           result := result + tempresult; tempresult := ‘‘; chunk := 0;
         end;
     end; //for every 8 characters, or 64 bits in the message

   //return the result as an array
   result := result + tempresult;
end; //end of des

//des_createKeys
//this takes as input a 64 bit key (even though only 56 bits are used)
//as an array of 2 dwords, and returns 16 48 bit keys
function des_createKeys(key:string):fdArray;
const
   //declaring this locally speeds things up a bit
   pc2bytes0   :array[0..15] of dword= (0,$4,$20000000,$20000004,$10000,$10004,$20010000,$20010004,$200,$204,$20000200,$20000204,$10200,$10204,$20010200,$20010204);
   pc2bytes1   :array[0..15] of dword= (0,$1,$100000,$100001,$4000000,$4000001,$4100000,$4100001,$100,$101,$100100,$100101,$4000100,$4000101,$4100100,$4100101);
   pc2bytes2   :array[0..15] of dword= (0,$8,$800,$808,$1000000,$1000008,$1000800,$1000808,0,$8,$800,$808,$1000000,$1000008,$1000800,$1000808);
   pc2bytes3   :array[0..15] of dword= (0,$200000,$8000000,$8200000,$2000,$202000,$8002000,$8202000,$20000,$220000,$8020000,$8220000,$22000,$222000,$8022000,$8222000);
   pc2bytes4   :array[0..15] of dword= (0,$40000,$10,$40010,0,$40000,$10,$40010,$1000,$41000,$1010,$41010,$1000,$41000,$1010,$41010);
   pc2bytes5   :array[0..15] of dword= (0,$400,$20,$420,0,$400,$20,$420,$2000000,$2000400,$2000020,$2000420,$2000000,$2000400,$2000020,$2000420);
   pc2bytes6   :array[0..15] of dword= (0,$10000000,$80000,$10080000,$2,$10000002,$80002,$10080002,0,$10000000,$80000,$10080000,$2,$10000002,$80002,$10080002);
   pc2bytes7   :array[0..15] of dword= (0,$10000,$800,$10800,$20000000,$20010000,$20000800,$20010800,$20000,$30000,$20800,$30800,$20020000,$20030000,$20020800,$20030800);
   pc2bytes8   :array[0..15] of dword= (0,$40000,0,$40000,$2,$40002,$2,$40002,$2000000,$2040000,$2000000,$2040000,$2000002,$2040002,$2000002,$2040002);
   pc2bytes9   :array[0..15] of dword= (0,$10000000,$8,$10000008,0,$10000000,$8,$10000008,$400,$10000400,$408,$10000408,$400,$10000400,$408,$10000408);
   pc2bytes10 :array[0..15] of dword= (0,$20,0,$20,$100000,$100020,$100000,$100020,$2000,$2020,$2000,$2020,$102000,$102020,$102000,$102020);
   pc2bytes11 :array[0..15] of dword= (0,$1000000,$200,$1000200,$200000,$1200000,$200200,$1200200,$4000000,$5000000,$4000200,$5000200,$4200000,$5200000,$4200200,$5200200);
   pc2bytes12 :array[0..15] of dword= (0,$1000,$8000000,$8001000,$80000,$81000,$8080000,$8081000,$10,$1010,$8000010,$8001010,$80010,$81010,$8080010,$8081010);
   pc2bytes13 :array[0..15] of dword= (0,$4,$100,$104,0,$4,$100,$104,$1,$5,$101,$105,$1,$5,$101,$105);

   //now define the left shifts which need to be done
   shifts :array[0..15] of dword = (0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0);
var
   iterations:integer;
   keys:fdArray;
   lefttemp, righttemp, temp:dword;
   m, n, j,i:integer;
   left,right:dword;
begin
   //how many iterations (1 for des, 3 for triple des)
   if length(key) = 24 then
     iterations := 3
   else
     iterations := 1;

   //stores the return keys
   setlength(keys,32 * iterations);

   //other variables
   m:=0;n:=0;

   for j:=0 to iterations-1 do //either 1 or 3 iterations
     begin
       left := (ord(key[m+1]) shl 24) or (ord(key[m+2]) shl 16) or (ord(key[m+3]) shl 8) or ord(key[m+4]);
       right := (ord(key[m+5]) shl 24) or (ord(key[m+6]) shl 16) or (ord(key[m+7]) shl 8) or ord(key[m+8]);
       m:=m+8;

       temp := ((left shr 4) xor right) and $0f0f0f0f; right :=right xor temp; left :=left xor (temp shl 4);
       temp := ((right shr 16) xor left) and $0000ffff; left := left xor temp; right :=right xor (temp shl 16);
       temp := ((left shr 2) xor right) and $33333333; right :=right xor temp; left := left xor (temp shl 2);
       temp := ((right shr 16) xor left) and $0000ffff; left :=left xor temp; right := right xor (temp shl 16);
       temp := ((left shr 1) xor right) and $55555555; right := right xor temp; left := left xor (temp shl 1);
       temp := ((right shr 8) xor left) and $00ff00ff; left :=left xor temp; right := right xor (temp shl 8);
       temp := ((left shr 1) xor right) and $55555555; right :=right xor temp; left := left xor (temp shl 1);

       //the right side needs to be shifted and to get the last four bits of the left side
       temp := (left shl 8) or ((right shr 20) and $000000f0);
       //left needs to be put upside down
       left := (right shl 24) or ((right shl 8) and $ff0000) or ((right shr 8) and $ff00) or ((right shr 24) and $f0);
       right := temp;

       //now go through and perform these shifts on the left and right keys
       for i:=low(shifts) to   high(shifts) do
         begin
           //shift the keys either one or two bits to the left
           if shifts[i] > 0 then
             begin
               left := (left shl 2) or (left shr 26);
               right := (right shl 2) or (right shr 26);
               //left := left shl 0;
               //right:= right shl 0;
             end
           else
             begin
               left := (left shl 1) or (left shr 27);
               right := (right shl 1) or (right shr 27);
               //left := left shl 0;
               //right:= right shl 0;
             end;

           left := left and $fffffff0;
           right:= right and $fffffff0;

           //now apply PC-2, in such a way that E is easier when encrypting or decrypting
           //this conversion will look like PC-2 except only the last 6 bits of each byte are used
           //rather than 48 consecutive bits and the order of lines will be according to
           //how the S selection functions will be applied: S2, S4, S6, S8, S1, S3, S5, S7
           lefttemp := pc2bytes0[left shr 28] or pc2bytes1[(left shr 24) and $f]
                       or pc2bytes2[(left shr 20) and $f] or pc2bytes3[(left shr 16) and $f]
                       or pc2bytes4[(left shr 12) and $f] or pc2bytes5[(left shr 8) and $f]
                       or pc2bytes6[(left shr 4) and $f];
           righttemp := pc2bytes7[right shr 28] or pc2bytes8[(right shr 24) and $f]
                        or pc2bytes9[(right shr 20) and $f] or pc2bytes10[(right shr 16) and $f]
                        or pc2bytes11[(right shr 12) and $f] or pc2bytes12[(right shr 8) and $f]
                        or pc2bytes13[(right shr 4) and $f];
           temp := ((righttemp shr 16) xor lefttemp) and $0000ffff;
           keys[n+0] := lefttemp xor temp;
           keys[n+1] := righttemp xor (temp shl 16);
           n:=n+2;
         end;
     end; //for each iterations

   //return the keys we‘ve created
   Result := keys;

end;//end of des_createKeys


function StrToHex(Str:string):string;
var
   i:integer;
begin
   result := ‘‘;
   for i := 1 to length(Str) do
     result := result + IntToHex(Ord(Str[i]), 2);
end;

function HexToStr(Hex:string):string;
var
   i:Integer;
begin
   Result := ‘‘;
   for i := 1 to length(Hex) div 2 do
     if IsInt(‘$‘ + Hex[i * 2 - 1] + Hex[i * 2]) then
       Result := Result + Chr(StrToInt(‘$‘ + Hex[i * 2 - 1] + Hex[i * 2]));
end;

function IsInt(Str:String):Boolean;
begin
   result := True;
   try
     StrToInt(Str);
   except
     result := False
   end;
end;

end.