Pascal (Lazarus/Delphi)

Export a Private Key as DER into a BinData

Demonstrates the Chilkat PrivateKey.GetPkcsBd method, which exports the key as DER into a BinData. The first argument selects PKCS #1 (true) versus PKCS #8 (false), the second is the password (empty for unencrypted), and the third is the BinData that receives the bytes.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is the in-memory binary export — the raw DER bytes land in a BinData ready to hash, encrypt, or hand to another API without a temporary file. One method covers several cases: the boolean picks the traditional (PKCS #1) versus modern (PKCS #8) structure, and a nonempty password produces an encrypted PKCS #8 export (with the cipher from Pkcs8EncryptAlg). Source any password securely.

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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.BinData;

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

procedure RunDemo;
var
  success: Boolean;
  privKey: TPrivateKey;
  password: string;
  usePkcs1: Boolean;
  bd: TBinData;

begin
  success := False;

  //  Load a private key to export.
  privKey := TPrivateKey.Create;
  success := privKey.LoadPemFile('qa_data/private.pem');
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  //  The key password is not hard-coded in a real application; obtain it from an interactive
  //  prompt, environment variable, or a secrets vault.
  password := 'myKeyPassword';

  //  Export the key as DER into a BinData.  The 1st argument selects PKCS #1 (True) versus PKCS #8
  //  (False); the 2nd is the password (empty string for an unencrypted export); the 3rd is the
  //  BinData that receives the DER bytes.
  usePkcs1 := False;
  bd := TBinData.Create;
  success := privKey.GetPkcsBd(usePkcs1,password,bd);
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;
  WriteLn('Exported ' + bd.NumBytes + ' DER bytes.');


  privKey.Free;
  bd.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.