title: How to get information about a keysize in php-openssl
body: <p>I want to change the crypt-functions in my php-app from mcrypt to openssl. Now I'm missing a function like mcrypt_enc_get_key_size() in openssl? How do I can read the max. keysize of a cypher-method in openssl?</p>
  
  <p>Example: blowfish(CFB)</p>
  
  <pre><code>mcrypt_enc_get_key_size() returns 56 (Bytes) =&gt; 448bit
  </code></pre>
  
  <p>Any idea?</p>