title: Authentication with bcrypt hashed password
body: <p>In my C++ application, user must login in order to use the application.
  The user login data are taken from phpBB 3.1 database, which uses for password hashing bcrypt. However, I didn't found any suitable example for C++.</p>
  
  <p>So my question is:</p>
  
  <p>How I can auth user with bcrypt hashed password in C++? I know how to do authentication from external database in C++, I just need help with the bcrypt.</p>
  
  <p>Thank you!</p>