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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_ca</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_ca - check if given certificate is CA certificate</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/x509v3.h></pre> <pre> int X509_check_ca(X509 *cert);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>This function checks if given certificate is CA certificate (can be used to sign other certificates).</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>Function return 0, if it is not CA certificate, 1 if it is proper X509v3 CA certificate with <strong>basicConstraints</strong> extension CA:TRUE, 3, if it is self-signed X509 v1 certificate, 4, if it is certificate with <strong>keyUsage</strong> extension with bit <strong>keyCertSign</strong> set, but without <strong>basicConstraints</strong>, and 5 if it has outdated Netscape Certificate Type extension telling that it is CA certificate.</p> <p>Actually, any nonzero value means that this certificate could have been used to sign other certificates.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>X509_verify_cert(3)</em>, <em>X509_check_issued(3)</em>, <em>X509_check_purpose(3)</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>