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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_blake2b512</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="#conforming_to">CONFORMING TO</a></li> <li><a href="#notes">NOTES</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_blake2b512, EVP_blake2s256 - BLAKE2 For EVP</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/evp.h></pre> <pre> const EVP_MD *EVP_blake2b512(void); const EVP_MD *EVP_blake2s256(void);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>BLAKE2 is an improved version of BLAKE, which was submitted to the NIST SHA-3 algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in <a href="http://www.ietf.org/rfc/rfc7693.txt" class="rfc">RFC 7693</a>.</p> <dl> <dt><strong><a name="evp_blake2s256" class="item">EVP_blake2s256()</a></strong></dt> <dd> <p>The BLAKE2s algorithm that produces a 256-bit output from a given input.</p> </dd> <dt><strong><a name="evp_blake2b512" class="item">EVP_blake2b512()</a></strong></dt> <dd> <p>The BLAKE2b algorithm that produces a 512-bit output from a given input.</p> </dd> </dl> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>These functions return a <strong>EVP_MD</strong> structure that contains the implementation of the symmetric cipher. See <em>EVP_MD_meth_new(3)</em> for details of the <strong>EVP_MD</strong> structure.</p> <p> </p> <hr /> <h1><a name="conforming_to">CONFORMING TO</a></h1> <p>RFC 7693.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>While the BLAKE2b and BLAKE2s algorithms supports a variable length digest, this implementation outputs a digest of a fixed length (the maximum length supported), which is 512-bits for BLAKE2b and 256-bits for BLAKE2s.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>evp(7)</em>, <em>EVP_DigestInit(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 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>