Instructions for use
1. Create a file in the current directory and name it, for example: "opencv".
2. Place the python/java program to be executed in the opencv directory.
3. Generate the RSA4096 public-private key pair (for signature verification),
   send the public key to the TA certificate issued by the server administrator,
   and save the TA certificate and private key to the package-tools directory in the current folder.
4. Run the compilation script pack.py to obtain the sec file, for example: "python3 pack.py opencv".
