title: sha1 in CodeIgniter?
body: <p>What is difference in CodeIgniter sha1 and normal PHP sha1?
  For example:</p>
  
  <pre><code>$codeigniter_hashed = $this -&gt; encrypt -&gt; sha1( "test" );
  </code></pre>
  
  <p>And</p>
  
  <pre><code>$normal_hashed = sha1("test");
  </code></pre>
  
  <p>Both will return same values.
  Where does CodeIgniter uses <code>encryption_key</code>? </p>