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  <title>secure_compare (lib/rack/utils.rb)</title>
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  <pre><span class="ruby-comment cmt"># File lib/rack/utils.rb, line 431</span>
    <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">secure_compare</span>(<span class="ruby-identifier">a</span>, <span class="ruby-identifier">b</span>)
      <span class="ruby-keyword kw">return</span> <span class="ruby-keyword kw">false</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">bytesize</span>(<span class="ruby-identifier">a</span>) <span class="ruby-operator">==</span> <span class="ruby-identifier">bytesize</span>(<span class="ruby-identifier">b</span>)

      <span class="ruby-identifier">l</span> = <span class="ruby-identifier">a</span>.<span class="ruby-identifier">unpack</span>(<span class="ruby-value str">&quot;C*&quot;</span>)

      <span class="ruby-identifier">r</span>, <span class="ruby-identifier">i</span> = <span class="ruby-value">0</span>, <span class="ruby-value">-1</span>
      <span class="ruby-identifier">b</span>.<span class="ruby-identifier">each_byte</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-identifier">r</span> <span class="ruby-operator">|=</span> <span class="ruby-identifier">v</span> <span class="ruby-operator">^</span> <span class="ruby-identifier">l</span>[<span class="ruby-identifier">i</span><span class="ruby-operator">+=</span><span class="ruby-value">1</span>] }
      <span class="ruby-identifier">r</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
    <span class="ruby-keyword kw">end</span></pre>
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