c++ implementation of md5sum algorithm, this version is slower than the md5sum command on linux, if anyone knows how to optimize,please give me our advice.

• Linux
  1. run command in shell :g++ -std=c++11 md5.cpp -o md5
  2. get md5 digest of your file ./md5 your_file_path
• Windows
  1. run command in cmd :g++ -std=c++11 md5.cpp -o md5.exe
  2. get md5 digest of your file md5.exe your_file_path