title: Produce MD5 or SHA1 hash code to long (64 bits)
body: <p>I need to compute a hash code of a string and store it into a 'long' variable.</p>
  
  <p>MD5 and SHA1 produce hash codes which are longer than 64 bits (MD5 - 128 bits, SHA1 - 160 bit).</p>
  
  <p>Ideas any one?</p>
  
  <p>Cheers,</p>
  
  <p>Doron</p>