title: Declare unsigned char array in swift
body: <p>What I used to do in obj-c:</p>
  
  <pre><code>unsigned char cHMAC[CC_SHA1_DIGEST_LENGTH];
  </code></pre>
  
  <p>what I tried in swift found here <a href="https://stackoverflow.com/questions/26299895/unsigned-char-in-swift">unsigned char in Swift</a>:</p>
  
  <pre><code>let cHMAC = [CUnsignedChar](count: CC_SHA1_DIGEST_LENGTH)
  </code></pre>
  
  <p>However this does not build because <em>extra argument count in call</em> </p>
  
  <p>Any ideas how I can translate the first code to swift?</p>