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X509_cmp.html
<?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@localhost" /> </head> <body> <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="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</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> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/x509.h> 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);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</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 <b>X509</b> objects indicated by parameters <b>a</b> and <b>b</b>. The comparison is based on the <b>memcmp</b> result of the hash values of two <b>X509</b> objects and the canonical (DER) encoding values.</p> <p>The X509_NAME_cmp() function compares two <b>X509_NAME</b> objects indicated by parameters <b>a</b> and <b>b</b>. The comparison is based on the <b>memcmp</b> result of the canonical (DER) encoding values of the two objects. <a href="../man3/i2d_X509_NAME.html">i2d_X509_NAME(3)</a> has a more detailed description of the DER encoding of the <b>X509_NAME</b> structure.</p> <p>The X509_issuer_and_serial_cmp() function compares the serial number and issuer values in the given <b>X509</b> objects <b>a</b> and <b>b</b>.</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 <b>X509_CRL</b> objects, respectively.</p> <p>The X509_CRL_match() function compares two <b>X509_CRL</b> objects. Unlike the X509_CRL_cmp() function, this function compares the whole CRL content instead of just the issuer name.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>Like common memory comparison functions, the <b>X509</b> comparison functions return an integer less than, equal to, or greater than zero if object <b>a</b> is found to be less than, to match, or be greater than object <b>b</b>, 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 <b>-2</b> to indicate an error.</p> <h1 id="NOTES">NOTES</h1> <p>These functions in fact utilize the underlying <b>memcmp</b> of the C library to do the comparison job. Data to be compared varies from DER encoding data, hash value or <b>ASN1_STRING</b>. 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 <b>-2</b> to indicate errors in some circumstances, which could cause confusion for the applications.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/i2d_X509_NAME.html">i2d_X509_NAME(3)</a>, <a href="../man3/i2d_X509.html">i2d_X509(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</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>
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