title: What hash algorithm to use for quick file hashing?
body: <p>What I'm looking for, as the title says, is for the best common hashing algorithm. It should be relatively quick to hash a 10mb or so file, and it should be as secure as possible to avoid collisions.</p>
  
  <p>Also, a link to a C++ implementation would be appreciated, preferably one with a licence that allows it to be used in a free but closed-source application, and if possible, a paid, closed-source application.</p>