NewKeyring">func NewKeyring</h4>
  <pre class="chroma"><span class="kd">func</span> <span class="nf">NewKeyring</span><span class="p">()</span> <a href="#Agent"><span class="nx">Agent</span></a></pre>
  <p>NewKeyring returns an Agent that holds keys in memory.  It is safe
for concurrent use by multiple goroutines.
<h3 id="ConstraintExtension">type ConstraintExtension</h3>
    <pre class="chroma"><span class="kd">type</span> <span class="nx">ConstraintExtension</span> <span class="kd">struct</span> <span cla