87 lines
3.4 KiB
HTML
Executable File
87 lines
3.4 KiB
HTML
Executable File
<?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:" />
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</head>
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<body>
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<ul id="index">
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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="#NOTES">NOTES</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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<h1 id="NAME">NAME</h1>
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<p>EVP_chacha20, EVP_chacha20_poly1305 - EVP ChaCha20 stream cipher</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/evp.h>
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const EVP_CIPHER *EVP_chacha20(void);
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const EVP_CIPHER *EVP_chacha20_poly1305(void);</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>The ChaCha20 stream cipher for EVP.</p>
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<dl>
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<dt id="EVP_chacha20">EVP_chacha20()</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. The first 64 bits consists of a counter in little-endian order followed by a 64 bit nonce. For example a nonce of:</p>
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<p>0000000000000002</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 id="EVP_chacha20_poly1305">EVP_chacha20_poly1305()</dt>
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<dd>
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<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>
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</dd>
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</dl>
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<h1 id="NOTES">NOTES</h1>
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<p>Developers should be aware of the negative performance implications of calling these functions multiple times and should consider using <a href="../man3/EVP_CIPHER_fetch.html">EVP_CIPHER_fetch(3)</a> with <a href="../man7/EVP_CIPHER-CHACHA.html">EVP_CIPHER-CHACHA(7)</a> instead. See <a href="../man7/crypto.html">"Performance" in crypto(7)</a> for further information.</p>
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<p><a href="https://www.rfc-editor.org/rfc/rfc7539.html#section-2.4">RFC 7539</a> uses a 32 bit counter and a 96 bit nonce for the IV.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<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>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<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>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2017-2023 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 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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</body>
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</html>
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