Pascal (Lazarus/Delphi)

RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format. 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.Pfx,
  Chilkat.PrivateKey,
  Chilkat.Rsa;

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

procedure RunDemo;
var
  success: Boolean;
  rsa: TRsa;
  pfx: TPfx;
  privKey: TPrivateKey;
  strData: string;
  base64Sig: string;

begin
  success := False;

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

  rsa := TRsa.Create;

  //  Load the .pfx/.p12
  pfx := TPfx.Create;
  success := pfx.LoadPfxFile('qa_data/pfx/myKey.p12','myPassword');
  if (success = False) then
    begin
      WriteLn(pfx.LastErrorText);
      Exit;
    end;

  //  Get the default private key.

  privKey := TPrivateKey.Create;
  success := pfx.PrivateKeyAt(0,privKey);
  if (success = False) then
    begin
      WriteLn(pfx.LastErrorText);
      Exit;
    end;

  //  Import the private key into the RSA component:
  success := rsa.UsePrivateKey(privKey);
  if (success = False) then
    begin
      WriteLn(rsa.LastErrorText);
      Exit;
    end;

  //  Get the signature in base64
  rsa.EncodingMode := 'base64';

  strData := 'This is the string to be signed.';

  //  Sign the string using the sha256 hash algorithm.
  //  Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
  base64Sig := rsa.SignStringENC(strData,'sha256');

  WriteLn(base64Sig);

  WriteLn('Success!');


  rsa.Free;
  pfx.Free;
  privKey.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.