JVMTI agent + JNI library for AES-based Java class bytecode encryption and runtime decryption. Works with mjar-java for build-time encryption and agent-based loading. 基于 JVMTI + JNI 的 Java class 字节码 AES 加密与运行时解密库，配合 mjar-java 实现构建时加密和 Agent 按需解密。