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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_sha224</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="#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_sha224, EVP_sha256, EVP_sha512_224, EVP_sha512_256, EVP_sha384, EVP_sha512 - SHA-2 For EVP</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/evp.h></pre> <pre> const EVP_MD *EVP_sha224(void); const EVP_MD *EVP_sha256(void); const EVP_MD *EVP_sha512_224(void); const EVP_MD *EVP_sha512_256(void); const EVP_MD *EVP_sha384(void); const EVP_MD *EVP_sha512(void);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>SHA-2 (Secure Hash Algorithm 2) is a family of cryptographic hash functions standardized in NIST FIPS 180-4, first published in 2001.</p> <dl> <dt><strong><a name="evp_sha224" class="item">EVP_sha224(), EVP_sha256(), EVP_sha512_224, EVP_sha512_256, EVP_sha384(), EVP_sha512()</a></strong></dt> <dd> <p>The SHA-2 SHA-224, SHA-256, SHA-512/224, SHA512/256, SHA-384 and SHA-512 algorithms, which generate 224, 256, 224, 256, 384 and 512 bits respectively of output from a given input.</p> <p>The two algorithms: SHA-512/224 and SHA512/256 are truncated forms of the SHA-512 algorithm. They are distinct from SHA-224 and SHA-256 even though their outputs are of the same size.</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>NIST FIPS 180-4.</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 2017-2018 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>