Pascal (Lazarus/Delphi)

Load a Private Key from BinData (Any Format)

Demonstrates the Chilkat PrivateKey.LoadAnyFormat method, which loads a private key by inspecting the bytes in a BinData. The first argument is the BinData and the second is the password (used if the detected key is encrypted).

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: When you have key bytes in memory but do not know their exact format — downloaded, decrypted, or pulled from a database — this figures it out for you, recognizing PKCS #1/#8 DER, encrypted PKCS #8, PEM, JWK, Chilkat XML, Microsoft formats, and more. It removes the guesswork of choosing a specific loader, at the small cost of the detection step. Supply the password so it can decrypt an encrypted key without a second call.

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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.BinData,
  Chilkat.PrivateKey;

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

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

begin
  success := False;

  //  Demonstrates the PrivateKey.LoadAnyFormat method, which loads a private key by inspecting the
  //  bytes in a BinData.  The 1st argument is the BinData and the 2nd is the password (used if the
  //  detected key is encrypted).

  bd := TBinData.Create;
  success := bd.LoadFile('qa_data/some_private_key');
  if (success = False) then
    begin
      WriteLn(bd.LastErrorText);
      Exit;
    end;

  privKey := TPrivateKey.Create;

  //  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';

  //  Chilkat auto-detects the representation: PKCS #1/#8 DER, encrypted PKCS #8, PEM, JWK,
  //  Chilkat XML, Microsoft formats, and more.
  success := privKey.LoadAnyFormat(bd,password);
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  WriteLn('Loaded a ' + privKey.KeyType + ' private key.');


  bd.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.