1. Install ROCKEY-ARM libs.
    cd install && sudo ./inst

2. Compile and run utpmd
    (1). cd utpmd && make clean && make
    (2). insert rockey
    (3). sudo ./utpmd
    (4). vi /var/log/syslog to check if utpmd runs successfully. 
         if log prints out "wait for connection", then utpmd is ready.
         if log prints out "open rockey() failed", then we need to rerun it.
         a. reinsert the rockey.
         b. pgrep utpmd | xargs sudo kill -s 9, kill all ./utpmd processes.
         c. sudo ./utpmd

3. Generate the libutpm.a static library
    make clean && make

4. Use the libutpm.a 
    mv libutpm.a test/
    cd test 
    gcc test_lib.c -lutpm -L . -I ./include/ -o test
    ./test
    

BUG TO FIX:
1. free_UTPM_KEY()
2. utpm_verify_data(), when the hash value is wrong, something werid happens.
3. utpm_create_context() will not close before call utpm_close_context(). In the same process, the first context will block the connection to ukey for about 30 secs.