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<p dir="auto">What about the following pseudo-code:</p>
<pre class="code highlight js-syntax-highlight c" lang="c" v-pre="true"><code><span id="LC1" class="line" lang="c"><span class="n">evp_cipher</span> <span class="o">=</span> <span class="n">EVP_get_cipherbyname</span><span class="p">(</span><span class="n">ocipher</span><span class="p">);</span></span>
<span id="LC2" class="line" lang="c"><span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">evp_cipher</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC3" class="line" lang="c"><span class="cm">/* XXX: fix version check later when LibreSSL fixes support for aes-ccm and chacha20-poly1305 */</span></span>
<span id="LC4" class="line" lang="c"><span class="cp">#ifdef LIBRESSL_VERSION_NUMBER</span></span>
<span id="LC5" class="line" lang="c"><span class="n">fprintf</span><span class="p">(</span><span class="s">"Failure!"</span><span class="err">\</span><span class="n">n</span><span class="s">");</span></span>
<span id="LC6" class="line" lang="c"><span class="s">return -1;</span></span>
<span id="LC7" class="line" lang="c"><span class="s">#else</span></span>
<span id="LC8" class="line" lang="c"><span class="s">/* OpenSSL should work */</span></span>
<span id="LC9" class="line" lang="c"><span class="s">fail("</span><span class="n">Failure</span> <span class="n">here</span><span class="o">!</span><span class="err">\</span><span class="n">n</span><span class="s">");</span></span>
<span id="LC10" class="line" lang="c"><span class="s">return -1;</span></span>
<span id="LC11" class="line" lang="c"><span class="s">#endif</span></span>
<span id="LC12" class="line" lang="c"><span class="s">}</span></span></code></pre>
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