Pascal (Lazarus/Delphi)

PBKDF2 - Derive Key from Password

See more Encryption Examples

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. 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;
  pw: string;
  pwCharset: string;
  hashAlg: string;
  saltHex: string;
  iterationCount: Integer;
  outputBitLen: Integer;
  enc: string;
  hexKey: string;

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

  crypt := TCrypt2.Create;

  pw := 'password';

  pwCharset := 'utf-8';

  //  Such as sha256, sha512
  hashAlg := 'sha256';

  //  16 bytes
  saltHex := '78578E5A5D63CB0668AB39B21C8637FA';

  iterationCount := 100000;

  //  Derive a 256-bit key from the password.
  outputBitLen := 256;

  //  The derived key is returned as a hex or base64 encoded string.
  //  (Note: The salt argument must be a string that also uses
  //  the same encoding.)
  enc := 'hex';

  hexKey := crypt.Pbkdf2(pw,pwCharset,hashAlg,saltHex,iterationCount,outputBitLen,enc);

  WriteLn(hexKey);

  //  Sample output:
  //  AE96E261E32792D0FD6F0E72F8E872D046F7DB4C1FA7C83892EC73C49F461B70


  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.