case CREATION_TIME:
return new SignatureCreationTime(isCritical, data);
case KEY_EXPIRE_TIME:
return new KeyExpirationTime(isCritical, data);
case EXPIRE_TIME:
return new SignatureExpirationTime(isCritical, data);
case REVOCABLE:
return new Revocable(isCritical, data);
case EXPORTABLE:
return new Exportable(isCritical, data);
case ISSUER_KEY_ID: