Pascal (Lazarus/Delphi)

Change Password for Java KeyStore File

See more Java KeyStore (JKS) Examples

Demonstrates how to load a Java keystore, change the password, and save using the new password. If the Java keystore contains only trusted root certificates, then it's simply a matter of loading the JKS with the existing password, and then saving with a new password. If the JKS contains private key entries, then each private key entry must be re-keyed using the new password by calling the ChangePassword method. 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.JavaKeyStore;

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

procedure RunDemo;
var
  success: Boolean;
  jks: TJavaKeyStore;
  oldJksPassword: string;
  newJksPassword: string;
  jksPath: string;
  numPrivateKeys: Integer;
  i: Integer;

begin
  success := False;

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

  jks := TJavaKeyStore.Create;

  oldJksPassword := 'existingPassword';
  newJksPassword := 'newPassword';
  jksPath := '/someDir/keyStore.jks';

  //  Load the Java keystore from a file.
  success := jks.LoadFile(oldJksPassword,jksPath);
  if (success <> True) then
    begin
      WriteLn(jks.LastErrorText);
      Exit;
    end;

  //  If the JKS contains private key entries, then each
  //  must be re-keyed with the new password by calling ChangePassword.
  numPrivateKeys := jks.NumPrivateKeys;

  i := 0;
  while i < numPrivateKeys do
    begin

      success := jks.ChangePassword(i,oldJksPassword,newJksPassword);
      if (success <> True) then
        begin
          WriteLn(jks.LastErrorText);
          Exit;
        end;

      i := i + 1;
    end;

  //  Write the JKS using the new password for the JKS file's keyed digest.
  success := jks.ToFile(newJksPassword,jksPath);
  if (success <> True) then
    begin
      WriteLn(jks.LastErrorText);
      Exit;
    end;

  WriteLn('Updated the password for the Java keystore file.');


  jks.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.