.buildElement(registerRequestElem);
Authentication authentication = registerRequest.getAuthentication();
XMLSignature keyBindingAuthentication = authentication
.getKeyBindingAuthentication();
assertTrue(keyBindingAuthentication.checkSignatureValue(authKey));
PrototypeKeyBinding prototypeKeyBinding = registerRequest
.getPrototypeKeyBinding();
KeyInfo keyInfo = prototypeKeyBinding.getKeyInfo();
PublicKey publicKey = keyInfo.getPublicKey();