Pascal (Lazarus/Delphi)

Get Base64 Public Key from Private Key

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Demonstrates how to get the public key in base64 format from a private key. 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.BinData,
  Chilkat.PrivateKey,
  Chilkat.PublicKey;

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

procedure RunDemo;
var
  success: Boolean;
  bd: TBinData;
  privKey: TPrivateKey;
  pubKey: TPublicKey;
  pubKeyBase64: string;

begin
  success := False;

  //  Load a private key from base64.
  bd := TBinData.Create;
  success := bd.AppendEncoded('MHQCA....n0Q==','base64');

  privKey := TPrivateKey.Create;
  success := privKey.LoadAnyFormat(bd,'');
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  pubKey := TPublicKey.Create;
  privKey.ToPublicKey(pubKey);

  pubKeyBase64 := pubKey.GetEncoded(True,'base64');
  WriteLn(pubKeyBase64);


  bd.Free;
  privKey.Free;
  pubKey.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.