Add test for encrypted signing keys.
Add test for encrypted signing keys.

schatt/keyczarjs,WeAreWizards/keyczarjs,schatt/keyczarjs,mitro-co/keyczarjs,mitro-co/keyczarjs,mitro-co/keyczarjs,WeAreWizards/keyczarjs,WeAreWizards/keyczarjs,schatt/keyczarjs