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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>EVP_chacha20</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <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 <openssl/evp.h></pre> <pre> const EVP_CIPHER *EVP_chacha20(void) const EVP_CIPHER *EVP_chacha20_poly1305(void)</pre> <p> </p> <hr /> <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> <p> </p> <hr /> <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> <hr /> <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 2017-2019 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> </body> </html>