Everything in this directory is dedicated to building the EvilProvider used with the SecKeyFacSunJCEPRF test (JDK-8218723). The makefile does require a JDK image path to be provided through the JAVA_BASE makefile variable. As an example: make JAVA_BASE=/usr/java/jdk-11.0.1 evilprov Since the EvilProvider is a modular jar, JDK 9 or later should be used. For OpenJDK, no signing is required. If signing is required (for use with Oracle JDK, for instance), you must obtain a JCE signing certificate and place it in a keystore, then run the "signed" makefile target (it will build the jar file if it does not already exist).