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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>EVP_chacha20, EVP_chacha20_poly1305 - EVP ChaCha20 stream cipher</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/evp.h&gt;

 const EVP_CIPHER *EVP_chacha20(void)
 const EVP_CIPHER *EVP_chacha20_poly1305(void)</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The ChaCha20 stream cipher for EVP.</p>

<dl>

<dt id="EVP_chacha20">EVP_chacha20()</dt>
<dd>

<p>The ChaCha20 stream cipher. The key length is 256 bits, the IV is 128 bits long. The first 32 bits consists of a counter in little-endian order followed by a 96 bit nonce. For example a nonce of:</p>

<p>000000000000000000000002</p>

<p>With an initial counter of 42 (2a in hex) would be expressed as:</p>

<p>2a000000000000000000000000000002</p>

</dd>
<dt id="EVP_chacha20_poly1305">EVP_chacha20_poly1305()</dt>
<dd>

<p>Authenticated encryption with ChaCha20-Poly1305. Like EVP_chacha20(), the key is 256 bits and the IV is 96 bits. This supports additional authenticated data (AAD) and produces a 128-bit authentication tag. See the <a href="../man3/EVP_EncryptInit.html">&quot;AEAD Interface&quot; in EVP_EncryptInit(3)</a> section for more information.</p>

</dd>
</dl>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>These functions return an <b>EVP_CIPHER</b> structure that contains the implementation of the symmetric cipher. See <a href="../man3/EVP_CIPHER_meth_new.html">EVP_CIPHER_meth_new(3)</a> for details of the <b>EVP_CIPHER</b> structure.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man7/evp.html">evp(7)</a>, <a href="../man3/EVP_EncryptInit.html">EVP_EncryptInit(3)</a>, <a href="../man3/EVP_CIPHER_meth_new.html">EVP_CIPHER_meth_new(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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