title: Is there a library for iPhone to work with HMAC-SHA-1 encoding
body: <p>For all operation with Amazon services(S3, EC2, SimpleDB) You need to sign all resquest with HMAC-SHA-1 Signature(<a href="http://en.wikipedia.org/wiki/HMAC" rel="noreferrer">http://en.wikipedia.org/wiki/HMAC</a> , <a href="http://docs.amazonwebservices.com/AWSFWS/latest/DeveloperGuide/index.html?SummaryOfAuthentication.html" rel="noreferrer">http://docs.amazonwebservices.com/AWSFWS/latest/DeveloperGuide/index.html?SummaryOfAuthentication.html</a>).</p>
  
  <p>I'm working under asp.net backend and there is no problems. Problem is in the iPhone application. iPhone developer says that there is no way to use HMAC-SHA-1 encoding, and he have no rigths to implement his own algorithm. As programmer I cannot understand why there can be a problem.</p>
  
  <p>So I want too know is iPhone developer right? </p>
  
  <p><em>I've never coded for iPhone, so I don't even where to search such an information.</em></p>