99 lines
2.9 KiB
HTML
99 lines
2.9 KiB
HTML
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<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>EVP_chacha20</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>EVP_chacha20,
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EVP_chacha20_poly1305
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- EVP ChaCha20 stream cipher</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/evp.h></pre>
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<pre>
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const EVP_CIPHER *EVP_chacha20(void)
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const EVP_CIPHER *EVP_chacha20_poly1305(void)</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>The ChaCha20 stream cipher for EVP.</p>
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<dl>
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<dt><strong><a name="evp_chacha20" class="item">EVP_chacha20()</a></strong></dt>
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<dd>
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<p>The ChaCha20 stream cipher. The key length is 256 bits, the IV is 128 bits long.
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The first 32 bits consists of a counter in little-endian order followed by a 96
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bit nonce. For example a nonce of:</p>
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<p>000000000000000000000002</p>
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<p>With an initial counter of 42 (2a in hex) would be expressed as:</p>
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<p>2a000000000000000000000000000002</p>
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</dd>
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<dt><strong><a name="evp_chacha20_poly1305" class="item">EVP_chacha20_poly1305()</a></strong></dt>
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<dd>
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<p>Authenticated encryption with ChaCha20-Poly1305. Like EVP_chacha20(), the key
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is 256 bits and the IV is 96 bits. This supports additional authenticated data
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(AAD) and produces a 128-bit authentication tag. See the
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<em>EVP_EncryptInit(3)/AEAD Interface</em> section for more information.</p>
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</dd>
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</dl>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p>These functions return an <strong>EVP_CIPHER</strong> structure that contains the
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implementation of the symmetric cipher. See <em>EVP_CIPHER_meth_new(3)</em> for
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details of the <strong>EVP_CIPHER</strong> structure.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>evp(7)</em>,
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<em>EVP_EncryptInit(3)</em>,
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<em>EVP_CIPHER_meth_new(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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