Pascal (Lazarus/Delphi)

RSA Signature SHA256withRSA, iso-8859-1, base64

See more RSA Examples

RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding. 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.PrivateKey,
  Chilkat.Rsa;

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

procedure RunDemo;
var
  success: Boolean;
  privKey: TPrivateKey;
  rsa: TRsa;
  originalData: string;
  sigBase64: string;

begin
  success := False;

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

  //  This example will duplicate the following Java code:
  //  
  //  Signature sign = Signature.getInstance("SHA256withRSA");
  //  sign.initSign(privateKey);
  //  sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
  //  
  //  ...
  //  byte[] resultado = sign.sign();
  //  sello = encodeByteArrayToBase64(resultado);
  //  

  //  Load an RSA private key for signing.
  //  You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
  privKey := TPrivateKey.Create;
  success := privKey.LoadAnyFormatFile('qa_data/pem/rsa_passwd.pem','passwd');
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  rsa := TRsa.Create;
  rsa.UsePrivateKey(privKey);

  originalData := 'This is the string to be hashed an RSA signed.';

  //  Indicate that we want the iso-8859-1 byte representation of the string to be signed
  rsa.Charset := 'iso-8859-1';

  //  We want the RSA signature in base64 format
  rsa.EncodingMode := 'base64';

  sigBase64 := rsa.SignStringENC(originalData,'sha256');
  WriteLn(sigBase64);


  privKey.Free;
  rsa.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.