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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>X509_check_issued</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="#see_also">SEE ALSO</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>X509_check_issued - checks if certificate is apparently issued by another certificate</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/x509v3.h></pre> <pre> int X509_check_issued(X509 *issuer, X509 *subject);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>X509_check_issued() checks if certificate <em>subject</em> was apparently issued using (CA) certificate <em>issuer</em>. This function takes into account not only matching of the issuer field of <em>subject</em> with the subject field of <em>issuer</em>, but also compares all sub-fields of the <strong>authorityKeyIdentifier</strong> extension of <em>subject</em>, as far as present, with the respective <strong>subjectKeyIdentifier</strong>, serial number, and issuer fields of <em>issuer</em>, as far as present. It also checks if the <strong>keyUsage</strong> field (if present) of <em>issuer</em> allows certificate signing. It does not check the certificate signature.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>Function return <strong>X509_V_OK</strong> if certificate <em>subject</em> is issued by <em>issuer</em> or some <strong>X509_V_ERR*</strong> constant to indicate an error.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>X509_verify_cert(3)</em>, <em>X509_check_ca(3)</em>, <em>verify(1)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2015-2020 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>