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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>CRYPTO_memcmp</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="#notes">NOTES</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>CRYPTO_memcmp - Constant time memory comparison</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/crypto.h></pre> <pre> int CRYPTO_memcmp(const void *a, const void *b, size_t len);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>The CRYPTO_memcmp function compares the <strong>len</strong> bytes pointed to by <strong>a</strong> and <strong>b</strong> for equality. It takes an amount of time dependent on <strong>len</strong>, but independent of the contents of the memory regions pointed to by <strong>a</strong> and <strong>b</strong>.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>CRYPTO_memcmp()</code> returns 0 if the memory regions are equal and nonzero otherwise.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>Unlike <code>memcmp(2)</code>, this function cannot be used to order the two memory regions as the return value when they differ is undefined, other than being nonzero.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.</p> <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> </body> </html>