title: RSA PKCS#1 V2.1 implementation in C++
body: <p>Where can I find RSA PKCS#1 V2.1 implementation in C++?<br/>
  I've found an implementation <a href="http://code.google.com/p/rsa/" rel="nofollow">here</a>, but I'm not sure it fits with that standard.<br/>
  Can anybody also explain major differences between various implementations of RSA algorithm which may cause inconsistency in action?</p>