Using HMAC SHA256 in Ruby : <p>I'm trying to apply HMAC-SHA256 for generate a key for an Rest API.</p>

<p>I'm doing something like this:</p>

<pre><code>def generateTransactionHash(stringToHash)
  key = '123'
  data = 'stringToHash'
  digest = OpenSSL::Digest.new('sha256')

  hmac = OpenSSL::HMAC.digest(digest, key, data)
  puts hmac
end
</code></pre>

<p>The output of this is always this: (if I put '12345' as parameter or 'HUSYED815X', I do get the same)</p>

<pre><code>ۯw/{o���p�T����:��a�h��E|q
</code></pre>

<p>The API is not working because of this... Can some one help me with that?</p>
