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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_verify_cert</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="#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> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>X509_verify_cert - discover and verify X509 certificate chain</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/x509.h></pre> <pre> int X509_verify_cert(X509_STORE_CTX *ctx);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>The X509_verify_cert() function attempts to discover and validate a certificate chain based on parameters in <strong>ctx</strong>. A complete description of the process is contained in the <em>verify(1)</em> manual page.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></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 <strong>ctx</strong> using, for example X509_STORE_CTX_get_error().</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></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 <strong>ctx</strong>, or when it is called twice in succession without reinitialising <strong>ctx</strong> 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 <= 0 return value on error.</p> <p> </p> <hr /> <h1><a name="bugs">BUGS</a></h1> <p>This function uses the header <strong>x509.h</strong> as opposed to most chain verification functions which use <strong>x509_vfy.h</strong>.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>X509_STORE_CTX_get_error(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2009-2016 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>