Pascal (Lazarus/Delphi)

PBES1 Password-Based Encryption (PBE)

See more Encryption Examples

Demonstrates how to implement password-based encryption according to the PKCS #5 v2.0: Password-Based Cryptography Standard (published by RSA Laboratories). This example uses PBES1, which ise based on the PBKDF1 function and an underlying block cipher such as RC2, DES, etc. 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;
  plainText: string;
  encryptedText: string;
  decryptedText: string;

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

  crypt := TCrypt2.Create;

  //  Set properties for PBES1 encryption:

  crypt.CryptAlgorithm := 'pbes1';
  crypt.PbesPassword := 'mySecretPassword';

  //  Set the underlying PBE algorithm (and key length):
  //  For PBES1, the underlying algorithm must be either
  //  56-bit DES or 64-bit RC2 
  //  (this is according to the PKCS#5 specifications at
  //  http://www.rsa.com/rsalabs/node.asp?id=2127   )
  crypt.PbesAlgorithm := 'rc2';
  crypt.KeyLength := 64;

  //  The salt for PBKDF1 is always 8 bytes:
  crypt.SetEncodedSalt('0102030405060708','hex');

  //  A higher iteration count makes the algorithm more
  //  computationally expensive and therefore exhaustive
  //  searches (for breaking the encryption) is more difficult:
  crypt.IterationCount := 1024;

  //  A hash algorithm needs to be set for PBES1:
  crypt.HashAlgorithm := 'sha1';

  //  Indicate that the encrypted bytes should be returned
  //  as a hex string:
  crypt.EncodingMode := 'hex';

  plainText := 'To be encrypted.';

  encryptedText := crypt.EncryptStringENC(plainText);

  WriteLn(encryptedText);

  //  Now decrypt:
  decryptedText := crypt.DecryptStringENC(encryptedText);

  WriteLn(decryptedText);


  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.