113 lines
4.7 KiB
HTML
Executable File
113 lines
4.7 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>X509_cmp</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>X509_cmp, X509_NAME_cmp,
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X509_issuer_and_serial_cmp, X509_issuer_name_cmp, X509_subject_name_cmp,
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X509_CRL_cmp, X509_CRL_match
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- compare X509 certificates and related values</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/x509.h></pre>
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<pre>
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int X509_cmp(const X509 *a, const X509 *b);
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int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b);
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int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b);
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int X509_issuer_name_cmp(const X509 *a, const X509 *b);
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int X509_subject_name_cmp(const X509 *a, const X509 *b);
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int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b);
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int X509_CRL_match(const X509_CRL *a, const X509_CRL *b);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>This set of functions are used to compare X509 objects, including X509
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certificates, X509 CRL objects and various values in an X509 certificate.</p>
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<p>The X509_cmp() function compares two <strong>X509</strong> objects indicated by parameters
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<strong>a</strong> and <strong>b</strong>. The comparison is based on the <strong>memcmp</strong> result of the hash
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values of two <strong>X509</strong> objects and the canonical (DER) encoding values.</p>
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<p>The X509_NAME_cmp() function compares two <strong>X509_NAME</strong> objects indicated by
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parameters <strong>a</strong> and <strong>b</strong>. The comparison is based on the <strong>memcmp</strong> result of
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the canonical (DER) encoding values of the two objects. <em>i2d_X509_NAME(3)</em>
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has a more detailed description of the DER encoding of the <strong>X509_NAME</strong> structure.</p>
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<p>The X509_issuer_and_serial_cmp() function compares the serial number and issuer
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values in the given <strong>X509</strong> objects <strong>a</strong> and <strong>b</strong>.</p>
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<p>The X509_issuer_name_cmp(), X509_subject_name_cmp() and X509_CRL_cmp() functions
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are effectively wrappers of the X509_NAME_cmp() function. These functions compare
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issuer names and subject names of the objects, or issuers of <strong>X509_CRL</strong>
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objects, respectively.</p>
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<p>The X509_CRL_match() function compares two <strong>X509_CRL</strong> objects. Unlike the
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X509_CRL_cmp() function, this function compares the whole CRL content instead
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of just the issuer name.</p>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p>Like common memory comparison functions, the <strong>X509</strong> comparison functions return
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an integer less than, equal to, or greater than zero if object <strong>a</strong> is found to
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be less than, to match, or be greater than object <strong>b</strong>, respectively.</p>
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<p>X509_NAME_cmp(), X509_issuer_and_serial_cmp(), X509_issuer_name_cmp(),
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X509_subject_name_cmp() and X509_CRL_cmp() may return <strong>-2</strong> to indicate an error.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>These functions in fact utilize the underlying <strong>memcmp</strong> of the C library to do
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the comparison job. Data to be compared varies from DER encoding data, hash
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value or <strong>ASN1_STRING</strong>. The sign of the comparison can be used to order the
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objects but it does not have a special meaning in some cases.</p>
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<p>X509_NAME_cmp() and wrappers utilize the value <strong>-2</strong> to indicate errors in some
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circumstances, which could cause confusion for the applications.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>i2d_X509_NAME(3)</em>, <em>i2d_X509(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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