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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>
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<h1 id="NAME">NAME</h1>
<p>EVP_chacha20, EVP_chacha20_poly1305 - EVP ChaCha20 stream cipher</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include <openssl/evp.h>
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">"AEAD Interface" in EVP_EncryptInit(3)</a> section for more information.</p>
</dd>
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<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 "License"). 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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