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<title>RSA_blinding_on</title>
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<ul id="index">
  <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>

<h1 id="NAME">NAME</h1>

<p>RSA_blinding_on, RSA_blinding_off - protect the RSA operation from timing attacks</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/rsa.h&gt;

 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);

 void RSA_blinding_off(RSA *rsa);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</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>RSA_blinding_on() turns blinding on for key <b>rsa</b> and generates a random blinding factor. <b>ctx</b> is <b>NULL</b> or a preallocated and initialized <b>BN_CTX</b>.</p>

<p>RSA_blinding_off() turns blinding off and frees the memory used for the blinding factor.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>RSA_blinding_on() returns 1 on success, and 0 if an error occurred.</p>

<p>RSA_blinding_off() returns no value.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). 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>


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