MD5 calculatealgrothm

You can save the source code to a file. Its name is "md5_cal.c" etc.
then compile it:
gcc -g -lcrpyto -o md5 md5_cal.c
And run it:
[root@www ~]#./md5 helloworld
MD5 result: fc5e038d38a57032085441e7fe7010b0