title: a good library for calculating sha-256 in c++
body: <p>I'm trying to find a good library for calculating sha256. I found already a lot of options </p>
  
  <p>crypto++ : <a href="http://www.cryptopp.com/">http://www.cryptopp.com/</a></p>
  
  <p>openSSL: <a href="http://www.openssl.org/">http://www.openssl.org/</a></p>
  
  <p>MIRACL: <a href="http://www.shamus.ie/">http://www.shamus.ie/</a></p>
  
  <p>I would much prefer a library that's well-known, widely industrially used and works on all  operating systems, rather than the most efficient one.</p>
  
  <p>What do you recommend for me? (feel free to recommend on a library that I didn't mention here).</p>