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  <div class="section" id="welcome-to-acme-python-s-documentation">
<h1>Welcome to acme-python’s documentation!<a class="headerlink" href="#welcome-to-acme-python-s-documentation" title="Permalink to this headline"></a></h1>
<p>Contents:</p>
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<li class="toctree-l1"><a class="reference internal" href="api.html">API Documentation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="api/challenges.html">Challenges</a></li>
<li class="toctree-l2"><a class="reference internal" href="api/client.html">Client</a></li>
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<li class="toctree-l2"><a class="reference internal" href="api/jose.html">JOSE</a></li>
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<span class="target" id="module-acme"></span><p>ACME protocol implementation.</p>
<p>This module is an implementation of the <a class="reference external" href="https://ietf-wg-acme.github.io/acme">ACME protocol</a>. Latest
supported version: <a class="reference external" href="https://github.com/ietf-wg-acme/acme/tree/draft-ietf-acme-acme-01">draft-ietf-acme-01</a>.</p>
<p>Example client:</p>
<div class="code python highlight-default"><div class="highlight"><pre><span></span><span class="sd">&quot;&quot;&quot;Example script showing how to use acme client API.&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">pkg_resources</span>

<span class="kn">from</span> <span class="nn">cryptography.hazmat.backends</span> <span class="k">import</span> <span class="n">default_backend</span>
<span class="kn">from</span> <span class="nn">cryptography.hazmat.primitives.asymmetric</span> <span class="k">import</span> <span class="n">rsa</span>
<span class="kn">import</span> <span class="nn">josepy</span> <span class="k">as</span> <span class="nn">jose</span>
<span class="kn">import</span> <span class="nn">OpenSSL</span>

<span class="kn">from</span> <span class="nn">acme</span> <span class="k">import</span> <span class="n">client</span>
<span class="kn">from</span> <span class="nn">acme</span> <span class="k">import</span> <span class="n">messages</span>


<span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>


<span class="n">DIRECTORY_URL</span> <span class="o">=</span> <span class="s1">&#39;https://acme-staging.api.letsencrypt.org/directory&#39;</span>
<span class="n">BITS</span> <span class="o">=</span> <span class="mi">2048</span>  <span class="c1"># minimum for Boulder</span>
<span class="n">DOMAIN</span> <span class="o">=</span> <span class="s1">&#39;example1.com&#39;</span>  <span class="c1"># example.com is ignored by Boulder</span>

<span class="c1"># generate_private_key requires cryptography&gt;=0.5</span>
<span class="n">key</span> <span class="o">=</span> <span class="n">jose</span><span class="o">.</span><span class="n">JWKRSA</span><span class="p">(</span><span class="n">key</span><span class="o">=</span><span class="n">rsa</span><span class="o">.</span><span class="n">generate_private_key</span><span class="p">(</span>
    <span class="n">public_exponent</span><span class="o">=</span><span class="mi">65537</span><span class="p">,</span>
    <span class="n">key_size</span><span class="o">=</span><span class="n">BITS</span><span class="p">,</span>
    <span class="n">backend</span><span class="o">=</span><span class="n">default_backend</span><span class="p">()))</span>
<span class="n">acme</span> <span class="o">=</span> <span class="n">client</span><span class="o">.</span><span class="n">Client</span><span class="p">(</span><span class="n">DIRECTORY_URL</span><span class="p">,</span> <span class="n">key</span><span class="p">)</span>

<span class="n">regr</span> <span class="o">=</span> <span class="n">acme</span><span class="o">.</span><span class="n">register</span><span class="p">()</span>
<span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">&#39;Auto-accepting TOS: </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span> <span class="n">regr</span><span class="o">.</span><span class="n">terms_of_service</span><span class="p">)</span>
<span class="n">acme</span><span class="o">.</span><span class="n">agree_to_tos</span><span class="p">(</span><span class="n">regr</span><span class="p">)</span>
<span class="n">logging</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="n">regr</span><span class="p">)</span>

<span class="n">authzr</span> <span class="o">=</span> <span class="n">acme</span><span class="o">.</span><span class="n">request_challenges</span><span class="p">(</span>
    <span class="n">identifier</span><span class="o">=</span><span class="n">messages</span><span class="o">.</span><span class="n">Identifier</span><span class="p">(</span><span class="n">typ</span><span class="o">=</span><span class="n">messages</span><span class="o">.</span><span class="n">IDENTIFIER_FQDN</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">DOMAIN</span><span class="p">))</span>
<span class="n">logging</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="n">authzr</span><span class="p">)</span>

<span class="n">authzr</span><span class="p">,</span> <span class="n">authzr_response</span> <span class="o">=</span> <span class="n">acme</span><span class="o">.</span><span class="n">poll</span><span class="p">(</span><span class="n">authzr</span><span class="p">)</span>

<span class="n">csr</span> <span class="o">=</span> <span class="n">OpenSSL</span><span class="o">.</span><span class="n">crypto</span><span class="o">.</span><span class="n">load_certificate_request</span><span class="p">(</span>
    <span class="n">OpenSSL</span><span class="o">.</span><span class="n">crypto</span><span class="o">.</span><span class="n">FILETYPE_ASN1</span><span class="p">,</span> <span class="n">pkg_resources</span><span class="o">.</span><span class="n">resource_string</span><span class="p">(</span>
        <span class="s1">&#39;acme&#39;</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">&#39;testdata&#39;</span><span class="p">,</span> <span class="s1">&#39;csr.der&#39;</span><span class="p">)))</span>
<span class="k">try</span><span class="p">:</span>
    <span class="n">acme</span><span class="o">.</span><span class="n">request_issuance</span><span class="p">(</span><span class="n">jose</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">ComparableX509</span><span class="p">(</span><span class="n">csr</span><span class="p">),</span> <span class="p">(</span><span class="n">authzr</span><span class="p">,))</span>
<span class="k">except</span> <span class="n">messages</span><span class="o">.</span><span class="n">Error</span> <span class="k">as</span> <span class="n">error</span><span class="p">:</span>
    <span class="nb">print</span> <span class="p">(</span><span class="s2">&quot;This script is doomed to fail as no authorization &quot;</span>
           <span class="s2">&quot;challenges are ever solved. Error from server: </span><span class="si">{0}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">error</span><span class="p">))</span>
</pre></div>
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<div class="section" id="indices-and-tables">
<h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline"></a></h1>
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