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<title>X509_verify_cert</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="#NOTES">NOTES</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_verify_cert - discover and verify X509 certificate chain</p>

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

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

 int X509_verify_cert(X509_STORE_CTX *ctx);</code></pre>

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

<p>The X509_verify_cert() function attempts to discover and validate a certificate chain based on parameters in <b>ctx</b>. A complete description of the process is contained in the <a href="../man1/verify.html">verify(1)</a> manual page.</p>

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

<p>If a complete chain can be built and validated this function returns 1, otherwise it return zero, in exceptional circumstances it can also return a negative code.</p>

<p>If the function fails additional error information can be obtained by examining <b>ctx</b> using, for example X509_STORE_CTX_get_error().</p>

<h1 id="NOTES">NOTES</h1>

<p>Applications rarely call this function directly but it is used by OpenSSL internally for certificate validation, in both the S/MIME and SSL/TLS code.</p>

<p>A negative return value from X509_verify_cert() can occur if it is invoked incorrectly, such as with no certificate set in <b>ctx</b>, or when it is called twice in succession without reinitialising <b>ctx</b> for the second call. A negative return value can also happen due to internal resource problems or if a retry operation is requested during internal lookups (which never happens with standard lookup methods). Applications must check for &lt;= 0 return value on error.</p>

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

<p>This function uses the header <b>x509.h</b> as opposed to most chain verification functions which use <b>x509_vfy.h</b>.</p>

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

<p><a href="../man3/X509_STORE_CTX_get_error.html">X509_STORE_CTX_get_error(3)</a></p>

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

<p>Copyright 2009-2016 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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