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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="#BUGS">BUGS</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

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

<p>X509_check_private_key, X509_REQ_check_private_key - check the consistency of a private key with the public key in an X509 certificate or certificate request</p>

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

<pre><code> #include &lt;openssl/x509.h&gt;

 int X509_check_private_key(X509 *x, EVP_PKEY *k);

 int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>X509_check_private_key() function checks the consistency of private key <b>k</b> with the public key in <b>x</b>.</p>

<p>X509_REQ_check_private_key() is equivalent to X509_check_private_key() except that <b>x</b> represents a certificate request of structure <b>X509_REQ</b>.</p>

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

<p>X509_check_private_key() and X509_REQ_check_private_key() return 1 if the keys match each other, and 0 if not.</p>

<p>If the key is invalid or an error occurred, the reason code can be obtained using <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>.</p>

<h1 id="BUGS">BUGS</h1>

<p>The <b>check_private_key</b> functions don&#39;t check if <b>k</b> itself is indeed a private key or not. It merely compares the public materials (e.g. exponent and modulus of an RSA key) and/or key parameters (e.g. EC params of an EC key) of a key pair. So if you pass a public key to these functions in <b>k</b>, it will return success.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a></p>

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

<p>Copyright 2017-2018 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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