Pascal (Lazarus/Delphi)

2-Key Triple DES (112 bits)

See more Encryption Examples

Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption). Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Crypt2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  crypt: TCrypt2;
  keyHex: string;
  encStr: string;
  decStr: string;

begin
  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  crypt := TCrypt2.Create;

  //  Specify 3DES for the encryption algorithm:
  crypt.CryptAlgorithm := '3des';

  crypt.CipherMode := 'ecb';

  //  For 2-Key Triple-DES, use a key length of 128
  //  (Given that each byte's msb is a parity bit, the strength is really 112 bits).
  crypt.KeyLength := 128;

  //  Pad with zeros
  crypt.PaddingScheme := 3;

  //  EncodingMode specifies the encoding of the output for
  //  encryption, and the input for decryption.
  //  It may be "hex", "url", "base64", or "quoted-printable".
  crypt.EncodingMode := 'hex';

  //  Let's create a secret key by using the MD5 hash of a password.
  //  The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
  crypt.HashAlgorithm := 'md5';
  keyHex := crypt.HashStringENC('secretPassword');

  //  Set the encryption key:
  crypt.SetEncodedKey(keyHex,'hex');

  //  Encrypt
  encStr := crypt.EncryptStringENC('The quick brown fox jumped over the lazy dog');
  WriteLn(encStr);

  //  Now decrypt:
  decStr := crypt.DecryptStringENC(encStr);
  WriteLn(decStr);


  crypt.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.