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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_cmp</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="#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_cmp, X509_NAME_cmp, X509_issuer_and_serial_cmp, X509_issuer_name_cmp, X509_subject_name_cmp, X509_CRL_cmp, X509_CRL_match - compare X509 certificates and related values</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/x509.h></pre> <pre> int X509_cmp(const X509 *a, const X509 *b); int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b); int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b); int X509_issuer_name_cmp(const X509 *a, const X509 *b); int X509_subject_name_cmp(const X509 *a, const X509 *b); int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b); int X509_CRL_match(const X509_CRL *a, const X509_CRL *b);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>This set of functions are used to compare X509 objects, including X509 certificates, X509 CRL objects and various values in an X509 certificate.</p> <p>The X509_cmp() function compares two <strong>X509</strong> objects indicated by parameters <strong>a</strong> and <strong>b</strong>. The comparison is based on the <strong>memcmp</strong> result of the hash values of two <strong>X509</strong> objects and the canonical (DER) encoding values.</p> <p>The X509_NAME_cmp() function compares two <strong>X509_NAME</strong> objects indicated by parameters <strong>a</strong> and <strong>b</strong>. The comparison is based on the <strong>memcmp</strong> result of the canonical (DER) encoding values of the two objects. <em>i2d_X509_NAME(3)</em> has a more detailed description of the DER encoding of the <strong>X509_NAME</strong> structure.</p> <p>The X509_issuer_and_serial_cmp() function compares the serial number and issuer values in the given <strong>X509</strong> objects <strong>a</strong> and <strong>b</strong>.</p> <p>The X509_issuer_name_cmp(), X509_subject_name_cmp() and X509_CRL_cmp() functions are effectively wrappers of the X509_NAME_cmp() function. These functions compare issuer names and subject names of the objects, or issuers of <strong>X509_CRL</strong> objects, respectively.</p> <p>The X509_CRL_match() function compares two <strong>X509_CRL</strong> objects. Unlike the X509_CRL_cmp() function, this function compares the whole CRL content instead of just the issuer name.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>Like common memory comparison functions, the <strong>X509</strong> comparison functions return an integer less than, equal to, or greater than zero if object <strong>a</strong> is found to be less than, to match, or be greater than object <strong>b</strong>, respectively.</p> <p>X509_NAME_cmp(), X509_issuer_and_serial_cmp(), X509_issuer_name_cmp(), X509_subject_name_cmp() and X509_CRL_cmp() may return <strong>-2</strong> to indicate an error.</p> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>These functions in fact utilize the underlying <strong>memcmp</strong> of the C library to do the comparison job. Data to be compared varies from DER encoding data, hash value or <strong>ASN1_STRING</strong>. The sign of the comparison can be used to order the objects but it does not have a special meaning in some cases.</p> <p>X509_NAME_cmp() and wrappers utilize the value <strong>-2</strong> to indicate errors in some circumstances, which could cause confusion for the applications.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>i2d_X509_NAME(3)</em>, <em>i2d_X509(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the Apache License 2.0 (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>