YubiKit
· This YubiKit is the core library and provides functionality to detect a YubiKey plugged in or tapped over NFC and to open an ISO/IEC 7816 connection that allows sending raw APDU commands to the key.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window yubikit-1.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.
