openssl-prebuild/linux_amd64/ssl/share/doc/openssl/html/man3/EVP_chacha20.html
2020-03-02 16:50:34 +00:00

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<title>EVP_chacha20</title>
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<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><a name="name">NAME</a></h1>
<p>EVP_chacha20,
EVP_chacha20_poly1305
- EVP ChaCha20 stream cipher</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include &lt;openssl/evp.h&gt;</pre>
<pre>
const EVP_CIPHER *EVP_chacha20(void)
const EVP_CIPHER *EVP_chacha20_poly1305(void)</pre>
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</p>
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<h1><a name="description">DESCRIPTION</a></h1>
<p>The ChaCha20 stream cipher for EVP.</p>
<dl>
<dt><strong><a name="evp_chacha20" class="item">EVP_chacha20()</a></strong></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><strong><a name="evp_chacha20_poly1305" class="item">EVP_chacha20_poly1305()</a></strong></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
<em>EVP_EncryptInit(3)/AEAD Interface</em> section for more information.</p>
</dd>
</dl>
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<h1><a name="return_values">RETURN VALUES</a></h1>
<p>These functions return an <strong>EVP_CIPHER</strong> structure that contains the
implementation of the symmetric cipher. See <em>EVP_CIPHER_meth_new(3)</em> for
details of the <strong>EVP_CIPHER</strong> structure.</p>
<p>
</p>
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<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>evp(7)</em>,
<em>EVP_EncryptInit(3)</em>,
<em>EVP_CIPHER_meth_new(3)</em></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the Apache License 2.0 (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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