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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>RSA_blinding_on</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="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/rsa.h></pre> <pre> int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);</pre> <pre> void RSA_blinding_off(RSA *rsa);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>RSA is vulnerable to timing attacks. In a setup where attackers can measure the time of RSA decryption or signature operations, blinding must be used to protect the RSA operation from that attack.</p> <p><code>RSA_blinding_on()</code> turns blinding on for key <strong>rsa</strong> and generates a random blinding factor. <strong>ctx</strong> is <strong>NULL</strong> or a preallocated and initialized <strong>BN_CTX</strong>.</p> <p><code>RSA_blinding_off()</code> turns blinding off and frees the memory used for the blinding factor.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p><code>RSA_blinding_on()</code> returns 1 on success, and 0 if an error occurred.</p> <p><code>RSA_blinding_off()</code> returns no value.</p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2000-2020 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>