Pascal (Lazarus/Delphi)

Load an Encrypted Private Key from PEM Text

Demonstrates the Chilkat PrivateKey.LoadEncryptedPem method, which loads a private key from PEM text, using a password when the PEM is encrypted. The first argument is the PEM string and the second is the password. Unencrypted PEM is also accepted.

Background: An encrypted PEM protects the key material at rest — a stolen file is useless without the passphrase — which is why encrypted keys are preferred for anything shipped or stored. This loader supplies that passphrase to decrypt a BEGIN ENCRYPTED PRIVATE KEY block (and gracefully handles unencrypted PEM too), so it is a safe default when a PEM might be either. The password should come from a secure source, never a hard-coded literal.

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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;

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

procedure RunDemo;
var
  success: Boolean;
  privKey: TPrivateKey;
  pemText: string;
  password: string;

begin
  success := False;

  //  Demonstrates the PrivateKey.LoadEncryptedPem method, which loads a private key from PEM text.
  //  The 1st argument is the PEM string and the 2nd is the password (used when the PEM is
  //  encrypted).  Unencrypted PEM is also accepted.

  privKey := TPrivateKey.Create;

  //  The PEM text of an encrypted private key.
  pemText := '-----BEGIN ENCRYPTED PRIVATE KEY-----' + #10 + 'MIIFHzBJ...' + #10 + '-----END ENCRYPTED PRIVATE KEY-----';

  //  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';

  success := privKey.LoadEncryptedPem(pemText,password);
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

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


  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.