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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="robots" content="noindex">
<title>File X509Cert.php</title>
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<body>
<div id="left">
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href="#304">304: </a></span><span class="l"><a href="#305">305: </a></span><span class="l"><a href="#306">306: </a></span><span class="l"><a href="#307">307: </a></span><span class="l"><a href="#308">308: </a></span><span class="l"><a href="#309">309: </a></span><span class="l"><a href="#310">310: </a></span><span class="l"><a href="#311">311: </a></span><span class="l"><a href="#312">312: </a></span><span class="l"><a href="#313">313: </a></span><span class="l"><a href="#314">314: </a></span><span class="l"><a href="#315">315: </a></span><span class="l"><a href="#316">316: </a></span><span class="l"><a href="#317">317: </a></span><span class="l"><a href="#318">318: </a></span><span class="l"><a href="#319">319: </a></span><span class="l"><a href="#320">320: </a></span><span class="l"><a href="#321">321: </a></span><span class="l"><a href="#322">322: </a></span><span class="l"><a href="#323">323: </a></span><span class="l"><a href="#324">324: </a></span><span class="l"><a 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class="l"><a href="#488">488: </a></span><span class="l"><a href="#489">489: </a></span><span class="l"><a href="#490">490: </a></span><span class="l"><a href="#491">491: </a></span><span class="l"><a href="#492">492: </a></span><span class="l"><a href="#493">493: </a></span><span class="l"><a href="#494">494: </a></span><span class="l"><a href="#495">495: </a></span><span class="l"><a href="#496">496: </a></span><span class="l"><a href="#497">497: </a></span><span class="l"><a href="#498">498: </a></span><span class="l"><a href="#499">499: </a></span><span class="l"><a href="#500">500: </a></span><span class="l"><a href="#501">501: </a></span><span class="l"><a href="#502">502: </a></span><span class="l"><a href="#503">503: </a></span><span class="l"><a href="#504">504: </a></span><span class="l"><a href="#505">505: </a></span><span class="l"><a href="#506">506: </a></span><span class="l"><a href="#507">507: </a></span><span class="l"><a href="#508">508: </a></span><span class="l"><a 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class="l"><a href="#571">571: </a></span><span class="l"><a href="#572">572: </a></span><span class="l"><a href="#573">573: </a></span><span class="l"><a href="#574">574: </a></span><span class="l"><a href="#575">575: </a></span><span class="l"><a href="#576">576: </a></span><span class="l"><a href="#577">577: </a></span><span class="l"><a href="#578">578: </a></span><span class="l"><a href="#579">579: </a></span><span class="l"><a href="#580">580: </a></span><span class="l"><a href="#581">581: </a></span><span class="l"><a href="#582">582: </a></span><span class="l"><a href="#583">583: </a></span><span class="l"><a href="#584">584: </a></span><span class="l"><a href="#585">585: </a></span><span class="l"><a href="#586">586: </a></span><span class="l"><a href="#587">587: </a></span><span class="l"><a href="#588">588: </a></span><span class="l"><a href="#589">589: </a></span><span class="l"><a href="#590">590: </a></span><span class="l"><a href="#591">591: </a></span><span class="l"><a 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href="#613">613: </a></span><span class="l"><a href="#614">614: </a></span><span class="l"><a href="#615">615: </a></span><span class="l"><a href="#616">616: </a></span><span class="l"><a href="#617">617: </a></span><span class="l"><a href="#618">618: </a></span><span class="l"><a href="#619">619: </a></span><span class="l"><a href="#620">620: </a></span><span class="l"><a href="#621">621: </a></span><span class="l"><a href="#622">622: </a></span><span class="l"><a href="#623">623: </a></span><span class="l"><a href="#624">624: </a></span><span class="l"><a href="#625">625: </a></span><span class="l"><a href="#626">626: </a></span></span><span class="l"><a href="#627">627: </a></span></span><span class="l"><a href="#628">628: </a></span></span><span class="l"><a href="#629">629: </a></span></span><span class="l"><a href="#630">630: </a></span></span><span class="l"><a href="#631">631: </a></span></span><span class="l"><a href="#632">632: </a></span></span><span class="l"><a href="#633">633: </a></span><span class="l"><a href="#634">634: </a></span><span class="l"><a href="#635">635: </a></span><span class="l"><a href="#636">636: </a></span><span class="l"><a href="#637">637: </a></span><span class="l"><a href="#638">638: </a></span><span class="l"><a href="#639">639: </a></span><span class="l"><a href="#640">640: </a></span><span class="l"><a href="#641">641: </a></span><span class="l"><a href="#642">642: </a></span><span class="l"><a href="#643">643: </a></span><span class="l"><a href="#644">644: </a></span><span class="l"><a href="#645">645: </a></span><span class="l"><a href="#646">646: </a></span><span class="l"><a href="#647">647: </a></span><span class="l"><a href="#648">648: </a></span><span class="l"><a href="#649">649: </a></span><span class="l"><a href="#650">650: </a></span><span class="l"><a href="#651">651: </a></span><span class="l"><a href="#652">652: </a></span><span class="l"><a href="#653">653: </a></span><span class="l"><a href="#654">654: </a></span><span class="l"><a href="#655">655: </a></span></span><span class="l"><a href="#656">656: </a></span></span><span class="l"><a href="#657">657: </a></span></span><span class="l"><a href="#658">658: </a></span></span><span class="l"><a href="#659">659: </a></span></span><span class="l"><a href="#660">660: </a></span></span><span class="l"><a href="#661">661: </a></span></span><span class="l"><a href="#662">662: </a></span><span class="l"><a href="#663">663: </a></span><span class="l"><a href="#664">664: </a></span><span class="l"><a href="#665">665: </a></span><span class="l"><a href="#666">666: </a></span><span class="l"><a href="#667">667: </a></span><span class="l"><a href="#668">668: </a></span><span class="l"><a href="#669">669: </a></span><span class="l"><a href="#670">670: </a></span><span class="l"><a href="#671">671: </a></span><span class="l"><a href="#672">672: </a></span><span class="l"><a href="#673">673: </a></span><span class="l"><a href="#674">674: </a></span><span class="l"><a href="#675">675: </a></span><span class="l"><a href="#676">676: </a></span><span class="l"><a href="#677">677: </a></span><span class="l"><a href="#678">678: </a></span><span class="l"><a href="#679">679: </a></span></code></pre>
<pre class="code"><code><span id="1" class="l"><span class="xlang"><?php</span>
</span><span id="2" class="l"><span class="php-comment">/**
</span></span><span id="3" class="l"><span class="php-comment"> * X509Cert.php
</span></span><span id="4" class="l"><span class="php-comment"> *
</span></span><span id="5" class="l"><span class="php-comment"> * Copyright © 2017 - Thierry Thiers <[email protected]>
</span></span><span id="6" class="l"><span class="php-comment"> *
</span></span><span id="7" class="l"><span class="php-comment"> * This software is governed by the CeCILL-C license under French law and
</span></span><span id="8" class="l"><span class="php-comment"> * abiding by the rules of distribution of free software. You can use, modify
</span></span><span id="9" class="l"><span class="php-comment"> * and/or redistribute the software under the terms of the CeCILL-C license as
</span></span><span id="10" class="l"><span class="php-comment"> * circulated by CEA, CNRS and INRIA at the following URL:
</span></span><span id="11" class="l"><span class="php-comment"> *
</span></span><span id="12" class="l"><span class="php-comment"> * http://www.cecill.info
</span></span><span id="13" class="l"><span class="php-comment"> *
</span></span><span id="14" class="l"><span class="php-comment"> * As a counterpart to the access to the source code and rights to copy, modify
</span></span><span id="15" class="l"><span class="php-comment"> * and redistribute granted by the license, users are provided only with a
</span></span><span id="16" class="l"><span class="php-comment"> * limited warranty and the software's author, the holder of the economic
</span></span><span id="17" class="l"><span class="php-comment"> * rights, and the successive licensors have only limited liability.
</span></span><span id="18" class="l"><span class="php-comment"> *
</span></span><span id="19" class="l"><span class="php-comment"> * In this respect, the user's attention is drawn to the risks associated with
</span></span><span id="20" class="l"><span class="php-comment"> * loading, using, modifying and/or developing or reproducing the software by
</span></span><span id="21" class="l"><span class="php-comment"> * the user in light of its specific status of free software, that may mean that
</span></span><span id="22" class="l"><span class="php-comment"> * it is complicated to manipulate, and that also therefore means that it is
</span></span><span id="23" class="l"><span class="php-comment"> * reserved for developers and experienced professionals having in-depth
</span></span><span id="24" class="l"><span class="php-comment"> * computer knowledge. Users are therefore encouraged to load and test the
</span></span><span id="25" class="l"><span class="php-comment"> * software's suitability as regards their requirements in conditions enabling
</span></span><span id="26" class="l"><span class="php-comment"> * the security of their systems and/or data to be ensured and, more generally,
</span></span><span id="27" class="l"><span class="php-comment"> * to use and operate it in the same conditions as regards security.
</span></span><span id="28" class="l"><span class="php-comment"> *
</span></span><span id="29" class="l"><span class="php-comment"> * The fact that you are presently reading this means that you have had
</span></span><span id="30" class="l"><span class="php-comment"> * knowledge of the CeCILL-C license and that you accept its terms.
</span></span><span id="31" class="l"><span class="php-comment"> *
</span></span><span id="32" class="l"><span class="php-comment"> * @author Thierry Thiers <[email protected]>
</span></span><span id="33" class="l"><span class="php-comment"> * @copyright 2017 - Thierry Thiers <[email protected]>
</span></span><span id="34" class="l"><span class="php-comment"> * @license http://www.cecill.info CeCILL-C License
</span></span><span id="35" class="l"><span class="php-comment"> * @version 1.0.0
</span></span><span id="36" class="l"><span class="php-comment"> */</span>
</span><span id="37" class="l">
</span><span id="38" class="l">
</span><span id="39" class="l"><span class="php-comment">// Namespace.</span>
</span><span id="40" class="l"><span class="php-keyword1">namespace</span> webcoder31\ezxmldsig;
</span><span id="41" class="l">
</span><span id="42" class="l"><span class="php-comment">// Use.</span>
</span><span id="43" class="l"><span class="php-keyword1">use</span> DateTime;
</span><span id="44" class="l"><span class="php-keyword1">use</span> DateTimeZone;
</span><span id="45" class="l"><span class="php-keyword1">use</span> Exception;
</span><span id="46" class="l">
</span><span id="47" class="l"><span class="php-comment">/**
</span></span><span id="48" class="l"><span class="php-comment"> * Analyze an X.509 certificate.
</span></span><span id="49" class="l"><span class="php-comment"> *
</span></span><span id="50" class="l"><span class="php-comment"> * The `X509Cert` class provides a set of convenient methods for extracting
</span></span><span id="51" class="l"><span class="php-comment"> * essential information contained in an X.509 certificate and for performing
</span></span><span id="52" class="l"><span class="php-comment"> * some useful checkings. In particular, it can verify the origin of the X.509
</span></span><span id="53" class="l"><span class="php-comment"> * certificate by using the intermediate certificate used by the CA to perform
</span></span><span id="54" class="l"><span class="php-comment"> * its signature (CSR). This class is used internaly by the `XMLDSigToken`
</span></span><span id="55" class="l"><span class="php-comment"> * class.
</span></span><span id="56" class="l"><span class="php-comment"> */</span>
</span><span id="57" class="l"><span class="php-keyword1">class</span> X509Cert
</span><span id="58" class="l">{
</span><span id="59" class="l"> <span class="php-comment">/** @var string The X.509 certificate in PEM format. */</span>
</span><span id="60" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$cert</span>;
</span><span id="61" class="l">
</span><span id="62" class="l"> <span class="php-comment">/** @var array The X.509 information of the certificatet. */</span>
</span><span id="63" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$x509Info</span>;
</span><span id="64" class="l">
</span><span id="65" class="l"> <span class="php-comment">/** @var string The signature that is encrypted in the certificate. */</span>
</span><span id="66" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$encryptedSignature</span>;
</span><span id="67" class="l">
</span><span id="68" class="l"> <span class="php-comment">/** @var string The signature that is encrypted in the certificate. */</span>
</span><span id="69" class="l"> <span class="php-keyword1">private</span> <span class="php-var">$originallyHashedContent</span>;
</span><span id="70" class="l">
</span><span id="71" class="l">
</span><span id="72" class="l"> <span class="php-comment">/**
</span></span><span id="73" class="l"><span class="php-comment"> * Create a new X509Cert object.
</span></span><span id="74" class="l"><span class="php-comment"> *
</span></span><span id="75" class="l"><span class="php-comment"> * @param string $cert An X.509 certificate (public key) in PEM format.
</span></span><span id="76" class="l"><span class="php-comment"> *
</span></span><span id="77" class="l"><span class="php-comment"> * @throws Exception
</span></span><span id="78" class="l"><span class="php-comment"> */</span>
</span><span id="79" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> __construct(<span class="php-var">$cert</span>)
</span><span id="80" class="l"> {
</span><span id="81" class="l"> <span class="php-comment">// DER encode the PEM certificate.</span>
</span><span id="82" class="l"> <span class="php-var">$derCert</span> = self::pemToDer(<span class="php-var">$cert</span>);
</span><span id="83" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$derCert</span>))
</span><span id="84" class="l"> {
</span><span id="85" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-quote">"Invalid certificate!"</span>);
</span><span id="86" class="l"> }
</span><span id="87" class="l">
</span><span id="88" class="l"> <span class="php-comment">// Get X.509 information.</span>
</span><span id="89" class="l"> <span class="php-var">$x509Info</span> = <span class="php-keyword2">openssl_x509_parse</span>(<span class="php-var">$cert</span>);
</span><span id="90" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$x509Info</span> === <span class="php-keyword1">false</span>)
</span><span id="91" class="l"> {
</span><span id="92" class="l"> <span class="php-var">$msg</span> = <span class="php-quote">"Failed to extract X.509 information from certificate!"</span>;
</span><span id="93" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-var">$msg</span>);
</span><span id="94" class="l"> }
</span><span id="95" class="l">
</span><span id="96" class="l"> <span class="php-comment">// Grab the encrypted signature from the DER encoded certificate.</span>
</span><span id="97" class="l"> <span class="php-var">$encryptedSignature</span> = self::extractEncryptedSignature(<span class="php-var">$derCert</span>);
</span><span id="98" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$encryptedSignature</span>))
</span><span id="99" class="l"> {
</span><span id="100" class="l"> <span class="php-var">$msg</span> = <span class="php-quote">"Failed to extract encrypted signature from certificate!"</span>;
</span><span id="101" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-var">$msg</span>);
</span><span id="102" class="l"> }
</span><span id="103" class="l">
</span><span id="104" class="l"> <span class="php-comment">// Get what was originally hashed by the issuer of the certiicate. </span>
</span><span id="105" class="l"> <span class="php-comment">// NOTE : This is the DER encoded certificate without the issuer </span>
</span><span id="106" class="l"> <span class="php-comment">// information and the signature.</span>
</span><span id="107" class="l"> <span class="php-var">$originallyHashedContent</span> = self::getHashedContent(<span class="php-var">$derCert</span>);
</span><span id="108" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$originallyHashedContent</span> === <span class="php-keyword1">false</span>)
</span><span id="109" class="l"> {
</span><span id="110" class="l"> <span class="php-var">$msg</span> = <span class="php-quote">"Failed to extract hashed content from certificate!"</span>;
</span><span id="111" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-var">$msg</span>);
</span><span id="112" class="l"> }
</span><span id="113" class="l">
</span><span id="114" class="l"> <span class="php-comment">// Store the PEM certificate.</span>
</span><span id="115" class="l"> <span class="php-var">$this</span>->cert = <span class="php-var">$cert</span>;
</span><span id="116" class="l">
</span><span id="117" class="l"> <span class="php-comment">// Store X.509 information.</span>
</span><span id="118" class="l"> <span class="php-var">$this</span>->x509Info = <span class="php-var">$x509Info</span>;
</span><span id="119" class="l">
</span><span id="120" class="l"> <span class="php-comment">// Store the encrypted signature.</span>
</span><span id="121" class="l"> <span class="php-var">$this</span>->encryptedSignature = <span class="php-var">$encryptedSignature</span>;
</span><span id="122" class="l">
</span><span id="123" class="l"> <span class="php-comment">// Store the content originally hashed by the issuer of the certiicate.</span>
</span><span id="124" class="l"> <span class="php-var">$this</span>->originallyHashedContent = <span class="php-var">$originallyHashedContent</span>;
</span><span id="125" class="l"> }
</span><span id="126" class="l">
</span><span id="127" class="l">
</span><span id="128" class="l"> <span class="php-comment">/**
</span></span><span id="129" class="l"><span class="php-comment"> * Get the certificate (public key) in PEM format.
</span></span><span id="130" class="l"><span class="php-comment"> *
</span></span><span id="131" class="l"><span class="php-comment"> * @return String The certificate (public key) in PEM format.
</span></span><span id="132" class="l"><span class="php-comment"> */</span>
</span><span id="133" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getPem()
</span><span id="134" class="l"> {
</span><span id="135" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->cert;
</span><span id="136" class="l"> }
</span><span id="137" class="l">
</span><span id="138" class="l">
</span><span id="139" class="l"> <span class="php-comment">/**
</span></span><span id="140" class="l"><span class="php-comment"> * Get the issuer information of the certificate.
</span></span><span id="141" class="l"><span class="php-comment"> *
</span></span><span id="142" class="l"><span class="php-comment"> * @return array The issuer information of the certificate.
</span></span><span id="143" class="l"><span class="php-comment"> */</span>
</span><span id="144" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getIssuer()
</span><span id="145" class="l"> {
</span><span id="146" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->x509Info[<span class="php-quote">'issuer'</span>];
</span><span id="147" class="l"> }
</span><span id="148" class="l">
</span><span id="149" class="l">
</span><span id="150" class="l"> <span class="php-comment">/**
</span></span><span id="151" class="l"><span class="php-comment"> * Get the subject information of the certificate.
</span></span><span id="152" class="l"><span class="php-comment"> *
</span></span><span id="153" class="l"><span class="php-comment"> * @return array The subject information of the certificate.
</span></span><span id="154" class="l"><span class="php-comment"> */</span>
</span><span id="155" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getSubject()
</span><span id="156" class="l"> {
</span><span id="157" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->x509Info[<span class="php-quote">'subject'</span>];
</span><span id="158" class="l"> }
</span><span id="159" class="l">
</span><span id="160" class="l">
</span><span id="161" class="l"> <span class="php-comment">/**
</span></span><span id="162" class="l"><span class="php-comment"> * Get the Distinguished Name of the certificate.
</span></span><span id="163" class="l"><span class="php-comment"> *
</span></span><span id="164" class="l"><span class="php-comment"> * @return string The Distinguished Name of the certificate.
</span></span><span id="165" class="l"><span class="php-comment"> */</span>
</span><span id="166" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getDN()
</span><span id="167" class="l"> {
</span><span id="168" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$this</span>->x509Info[<span class="php-quote">'name'</span>];
</span><span id="169" class="l"> }
</span><span id="170" class="l">
</span><span id="171" class="l">
</span><span id="172" class="l"> <span class="php-comment">/**
</span></span><span id="173" class="l"><span class="php-comment"> * Get the UTC date from which the certificate is valid.
</span></span><span id="174" class="l"><span class="php-comment"> *
</span></span><span id="175" class="l"><span class="php-comment"> * @param string The format of the returned date.
</span></span><span id="176" class="l"><span class="php-comment"> * Default: 'ymdHise'
</span></span><span id="177" class="l"><span class="php-comment"> *
</span></span><span id="178" class="l"><span class="php-comment"> * @return string|false The date from which the certificate is valid,
</span></span><span id="179" class="l"><span class="php-comment"> * FALSE if $dateFormat is invalid.
</span></span><span id="180" class="l"><span class="php-comment"> */</span>
</span><span id="181" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getValidFrom(<span class="php-var">$dateFormat</span> = <span class="php-quote">'ymdHise'</span>)
</span><span id="182" class="l"> {
</span><span id="183" class="l"> <span class="php-var">$tz</span> = <span class="php-keyword1">new</span> DateTimeZone(<span class="php-quote">'UTC'</span>);
</span><span id="184" class="l"> <span class="php-var">$validFrom</span> = <span class="php-var">$this</span>->x509Info[<span class="php-quote">'validFrom'</span>];
</span><span id="185" class="l"> <span class="php-var">$dt</span> = DateTime::createFromFormat(<span class="php-quote">'ymdHise'</span>, <span class="php-var">$validFrom</span>, <span class="php-var">$tz</span>);
</span><span id="186" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$dt</span>->format(<span class="php-var">$dateFormat</span>);
</span><span id="187" class="l"> }
</span><span id="188" class="l">
</span><span id="189" class="l">
</span><span id="190" class="l"> <span class="php-comment">/**
</span></span><span id="191" class="l"><span class="php-comment"> * Get the UTC date to which the certificate is valid.
</span></span><span id="192" class="l"><span class="php-comment"> *
</span></span><span id="193" class="l"><span class="php-comment"> * @param string The format of the returned date.
</span></span><span id="194" class="l"><span class="php-comment"> * Default: 'ymdHise'
</span></span><span id="195" class="l"><span class="php-comment"> *
</span></span><span id="196" class="l"><span class="php-comment"> * @return string|false The date to which the certificate is valid,
</span></span><span id="197" class="l"><span class="php-comment"> * FALSE if $dateFormat is invalid.
</span></span><span id="198" class="l"><span class="php-comment"> */</span>
</span><span id="199" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> getValidTo(<span class="php-var">$dateFormat</span> = <span class="php-quote">'ymdHise'</span>)
</span><span id="200" class="l"> {
</span><span id="201" class="l"> <span class="php-var">$tz</span> = <span class="php-keyword1">new</span> DateTimeZone(<span class="php-quote">'UTC'</span>);
</span><span id="202" class="l"> <span class="php-var">$validTo</span> = <span class="php-var">$this</span>->x509Info[<span class="php-quote">'validTo'</span>];
</span><span id="203" class="l"> <span class="php-var">$dt</span> = DateTime::createFromFormat(<span class="php-quote">'ymdHise'</span>, <span class="php-var">$validTo</span>, <span class="php-var">$tz</span>);
</span><span id="204" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$dt</span>->format(<span class="php-var">$dateFormat</span>);
</span><span id="205" class="l"> }
</span><span id="206" class="l">
</span><span id="207" class="l">
</span><span id="208" class="l"> <span class="php-comment">/**
</span></span><span id="209" class="l"><span class="php-comment"> * Indicates whether the certificate is out of date or not.
</span></span><span id="210" class="l"><span class="php-comment"> *
</span></span><span id="211" class="l"><span class="php-comment"> * @return boolean TRUE if embedded certificate is out of date,
</span></span><span id="212" class="l"><span class="php-comment"> * FALSE otherwise.
</span></span><span id="213" class="l"><span class="php-comment"> */</span>
</span><span id="214" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> isOutOfDate()
</span><span id="215" class="l"> {
</span><span id="216" class="l"> <span class="php-comment">// We will compare date in UTC.</span>
</span><span id="217" class="l"> <span class="php-var">$tz</span> = <span class="php-keyword1">new</span> DateTimeZone(<span class="php-quote">'UTC'</span>);
</span><span id="218" class="l">
</span><span id="219" class="l"> <span class="php-comment">// Compute the UTC UNIX timestamp for the current date/time.</span>
</span><span id="220" class="l"> <span class="php-var">$curDate</span> = <span class="php-keyword1">new</span> DateTime(<span class="php-quote">'now'</span>, <span class="php-var">$tz</span>);
</span><span id="221" class="l"> <span class="php-var">$curTimestamp</span> = <span class="php-var">$curDate</span>->getTimestamp();
</span><span id="222" class="l">
</span><span id="223" class="l"> <span class="php-comment">// Compute the UTC UNIX timestamp certificate 'validFrom' date.</span>
</span><span id="224" class="l"> <span class="php-var">$validFrom</span> = <span class="php-var">$this</span>->x509Info[<span class="php-quote">'validFrom'</span>];
</span><span id="225" class="l"> <span class="php-var">$fromDate</span> = DateTime::createFromFormat(<span class="php-quote">'ymdHise'</span>, <span class="php-var">$validFrom</span>, <span class="php-var">$tz</span>);
</span><span id="226" class="l"> <span class="php-var">$fromTimestamp</span> = <span class="php-var">$fromDate</span>->getTimestamp();
</span><span id="227" class="l">
</span><span id="228" class="l"> <span class="php-comment">// Compute the UTC UNIX timestamp certificate 'validTo' date.</span>
</span><span id="229" class="l"> <span class="php-var">$validTo</span> = <span class="php-var">$this</span>->x509Info[<span class="php-quote">'validTo'</span>];
</span><span id="230" class="l"> <span class="php-var">$toDate</span> = DateTime::createFromFormat(<span class="php-quote">'ymdHise'</span>, <span class="php-var">$validTo</span>, <span class="php-var">$tz</span>);
</span><span id="231" class="l"> <span class="php-var">$toTimestamp</span> = <span class="php-var">$toDate</span>->getTimestamp();
</span><span id="232" class="l">
</span><span id="233" class="l"> <span class="php-comment">// Return timestamps comparison result.</span>
</span><span id="234" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$curTimestamp</span> < <span class="php-var">$fromTimestamp</span> || <span class="php-var">$curTimestamp</span> > <span class="php-var">$toTimestamp</span>;
</span><span id="235" class="l"> }
</span><span id="236" class="l">
</span><span id="237" class="l">
</span><span id="238" class="l"> <span class="php-comment">/**
</span></span><span id="239" class="l"><span class="php-comment"> * Check the origin of the certificate.
</span></span><span id="240" class="l"><span class="php-comment"> *
</span></span><span id="241" class="l"><span class="php-comment"> * Verify that the X.509 certificate has been signed with the private key
</span></span><span id="242" class="l"><span class="php-comment"> * correcsponding to the given CA certificate to validate its origin.
</span></span><span id="243" class="l"><span class="php-comment"> * NOTE : Note that more than one CA certificate can give a positive result,
</span></span><span id="244" class="l"><span class="php-comment"> * some certificates re-issue signing certificates after having only
</span></span><span id="245" class="l"><span class="php-comment"> * changed the expiration dates.
</span></span><span id="246" class="l"><span class="php-comment"> * Note that it also works with self-signed certificates. In this
</span></span><span id="247" class="l"><span class="php-comment"> * case, passes the the X.509 certificate that is supposed been
</span></span><span id="248" class="l"><span class="php-comment"> * included in the XML digital signature to the function.
</span></span><span id="249" class="l"><span class="php-comment"> *
</span></span><span id="250" class="l"><span class="php-comment"> * @param string $caCert The certificate (in PEM format) corresponding to
</span></span><span id="251" class="l"><span class="php-comment"> * the private key that is supposed been used by CA to sign the X.509
</span></span><span id="252" class="l"><span class="php-comment"> * certificate.
</span></span><span id="253" class="l"><span class="php-comment"> *
</span></span><span id="254" class="l"><span class="php-comment"> * @return boolean TRUE if origin of the X.509 certificate has been
</span></span><span id="255" class="l"><span class="php-comment"> * validated, FALSE otherwise.
</span></span><span id="256" class="l"><span class="php-comment"> *
</span></span><span id="257" class="l"><span class="php-comment"> * @throws Exception
</span></span><span id="258" class="l"><span class="php-comment"> */</span>
</span><span id="259" class="l"> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> isValidCA(<span class="php-var">$caCert</span>)
</span><span id="260" class="l"> {
</span><span id="261" class="l"> <span class="php-comment">// Get the public key from the CA certificate, which is supposed been</span>
</span><span id="262" class="l"> <span class="php-comment">// used to encrypt the signature in the X.509 embedded certificate.</span>
</span><span id="263" class="l"> <span class="php-var">$caPublicKey</span> = <span class="php-keyword2">openssl_pkey_get_public</span>(<span class="php-var">$caCert</span>);
</span><span id="264" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">false</span> === <span class="php-var">$caPublicKey</span>)
</span><span id="265" class="l"> {
</span><span id="266" class="l"> <span class="php-var">$msg</span> = <span class="php-quote">"Failed to get the public key from the CA certificate!"</span>;
</span><span id="267" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-var">$msg</span>);
</span><span id="268" class="l"> }
</span><span id="269" class="l">
</span><span id="270" class="l"> <span class="php-comment">// Try to decrypt the encrypted signature using the CA's public key.</span>
</span><span id="271" class="l"> <span class="php-comment">// The decrypted signature is a DER encoded ASN1 structure containing</span>
</span><span id="272" class="l"> <span class="php-comment">// the signature algorithm and the signature hash.</span>
</span><span id="273" class="l"> <span class="php-comment">// NOTE : The decrypted signature will be stored in $decryptedSignature.</span>
</span><span id="274" class="l"> <span class="php-var">$result</span> = <span class="php-keyword2">openssl_public_decrypt</span>(
</span><span id="275" class="l"> <span class="php-var">$this</span>->encryptedSignature,
</span><span id="276" class="l"> <span class="php-var">$decryptedSignature</span>,
</span><span id="277" class="l"> <span class="php-var">$caPublicKey</span>
</span><span id="278" class="l"> );
</span><span id="279" class="l">
</span><span id="280" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword1">false</span> === <span class="php-var">$result</span>)
</span><span id="281" class="l"> {
</span><span id="282" class="l"> <span class="php-comment">// Signature cannot be decrypted! This mean that the CA's public key</span>
</span><span id="283" class="l"> <span class="php-comment">// was not used to sign the embedded X.509 certificate.</span>
</span><span id="284" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="285" class="l"> }
</span><span id="286" class="l">
</span><span id="287" class="l"> <span class="php-comment">// Get the OID of the signature hash algorithm, which is required</span>
</span><span id="288" class="l"> <span class="php-comment">// to generate our own hash of the originally hashed content.</span>
</span><span id="289" class="l"> <span class="php-comment">// This hash will then be compared to the issuer's hash.</span>
</span><span id="290" class="l"> <span class="php-var">$oid</span> = self::getSignatureAlgorithmOid(<span class="php-var">$decryptedSignature</span>);
</span><span id="291" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$oid</span> === <span class="php-keyword1">false</span>)
</span><span id="292" class="l"> {
</span><span id="293" class="l"> <span class="php-var">$msg</span> = <span class="php-quote">"Failed to determine algorithm used to sign certificate!"</span>;
</span><span id="294" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-var">$msg</span>);
</span><span id="295" class="l"> }
</span><span id="296" class="l"> <span class="php-keyword1">switch</span> (<span class="php-var">$oid</span>)
</span><span id="297" class="l"> {
</span><span id="298" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'1.2.840.113549.2.2'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'md2'</span>;
</span><span id="299" class="l"> <span class="php-keyword1">break</span>;
</span><span id="300" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'1.2.840.113549.2.4'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'md4'</span>;
</span><span id="301" class="l"> <span class="php-keyword1">break</span>;
</span><span id="302" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'1.2.840.113549.2.5'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'md5'</span>;
</span><span id="303" class="l"> <span class="php-keyword1">break</span>;
</span><span id="304" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'1.3.14.3.2.18'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'sha'</span>;
</span><span id="305" class="l"> <span class="php-keyword1">break</span>;
</span><span id="306" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'1.3.14.3.2.26'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'sha1'</span>;
</span><span id="307" class="l"> <span class="php-keyword1">break</span>;
</span><span id="308" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'2.16.840.1.101.3.4.2.1'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'sha256'</span>;
</span><span id="309" class="l"> <span class="php-keyword1">break</span>;
</span><span id="310" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'2.16.840.1.101.3.4.2.2'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'sha384'</span>;
</span><span id="311" class="l"> <span class="php-keyword1">break</span>;
</span><span id="312" class="l"> <span class="php-keyword1">case</span> <span class="php-quote">'2.16.840.1.101.3.4.2.3'</span>: <span class="php-var">$algorithm</span> = <span class="php-quote">'sha512'</span>;
</span><span id="313" class="l"> <span class="php-keyword1">break</span>;
</span><span id="314" class="l"> <span class="php-keyword1">default</span>:
</span><span id="315" class="l"> <span class="php-var">$msg</span> = <span class="php-quote">"Algorithm used to sign the certificate is unknown!"</span>;
</span><span id="316" class="l"> <span class="php-keyword1">throw</span> <span class="php-keyword1">new</span> Exception(<span class="php-var">$msg</span>);
</span><span id="317" class="l"> <span class="php-keyword1">break</span>;
</span><span id="318" class="l"> }
</span><span id="319" class="l">
</span><span id="320" class="l"> <span class="php-comment">// Get the hash generated by the issuer from the decrypted signature.</span>
</span><span id="321" class="l"> <span class="php-var">$signatureHash</span> = self::getSignatureHash(<span class="php-var">$decryptedSignature</span>);
</span><span id="322" class="l">
</span><span id="323" class="l"> <span class="php-comment">// Hash the originally hashed content with the same algorithm.</span>
</span><span id="324" class="l"> <span class="php-var">$computedHash</span> = <span class="php-keyword2">hash</span>(<span class="php-var">$algorithm</span>, <span class="php-var">$this</span>->originallyHashedContent);
</span><span id="325" class="l">
</span><span id="326" class="l"> <span class="php-comment">// Compare hashes and returns the result.</span>
</span><span id="327" class="l"> <span class="php-keyword1">return</span> (<span class="php-var">$signatureHash</span> === <span class="php-var">$computedHash</span>);
</span><span id="328" class="l"> }
</span><span id="329" class="l">
</span><span id="330" class="l">
</span><span id="331" class="l"> <span class="php-comment">/**
</span></span><span id="332" class="l"><span class="php-comment"> * Extract encrypted signature from a DER encoded certificate.
</span></span><span id="333" class="l"><span class="php-comment"> * Expects X.509 DER encoded certificate consisting of a section container
</span></span><span id="334" class="l"><span class="php-comment"> * containing 2 sequences and a bitstream. The bitstream contains the
</span></span><span id="335" class="l"><span class="php-comment"> * original signature encrypted with the public key of the issuing signer.
</span></span><span id="336" class="l"><span class="php-comment"> * The DER encoded certificate has the following structure:
</span></span><span id="337" class="l"><span class="php-comment"> * SEQUENCE
</span></span><span id="338" class="l"><span class="php-comment"> * SEQUENCE (Issuer and signature sections)
</span></span><span id="339" class="l"><span class="php-comment"> * ...
</span></span><span id="340" class="l"><span class="php-comment"> * ...
</span></span><span id="341" class="l"><span class="php-comment"> * SEQUENCE (Signature encryption algorithm OID)
</span></span><span id="342" class="l"><span class="php-comment"> * ...
</span></span><span id="343" class="l"><span class="php-comment"> * NULL
</span></span><span id="344" class="l"><span class="php-comment"> * BITSTREAM (Encrypted signature)
</span></span><span id="345" class="l"><span class="php-comment"> *
</span></span><span id="346" class="l"><span class="php-comment"> * @param string $derCertificate DER encoded certificate.
</span></span><span id="347" class="l"><span class="php-comment"> *
</span></span><span id="348" class="l"><span class="php-comment"> * @return string|false The encrypted signature on success,
</span></span><span id="349" class="l"><span class="php-comment"> * FALSE on failure.
</span></span><span id="350" class="l"><span class="php-comment"> */</span>
</span><span id="351" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> extractEncryptedSignature(<span class="php-var">$derCertificate</span>)
</span><span id="352" class="l"> {
</span><span id="353" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">strlen</span>(<span class="php-var">$derCertificate</span>) < <span class="php-num">5</span>)
</span><span id="354" class="l"> {
</span><span id="355" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="356" class="l"> }
</span><span id="357" class="l">
</span><span id="358" class="l"> <span class="php-comment">// Skip container sequence.</span>
</span><span id="359" class="l"> <span class="php-var">$derData</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derCertificate</span>, <span class="php-num">4</span>);
</span><span id="360" class="l">
</span><span id="361" class="l"> <span class="php-comment">// Now burns through two sequences and then return the final bitstream.</span>
</span><span id="362" class="l"> <span class="php-keyword1">while</span> (<span class="php-keyword2">strlen</span>(<span class="php-var">$derData</span>) > <span class="php-num">1</span>)
</span><span id="363" class="l"> {
</span><span id="364" class="l"> <span class="php-comment">// Get the class of the following data.</span>
</span><span id="365" class="l"> <span class="php-var">$class</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">0</span>]);
</span><span id="366" class="l">
</span><span id="367" class="l"> <span class="php-keyword1">switch</span> (<span class="php-var">$class</span>)
</span><span id="368" class="l"> {
</span><span id="369" class="l"> <span class="php-comment">// Sequence class case.</span>
</span><span id="370" class="l"> <span class="php-keyword1">case</span> <span class="php-num">0x30</span>:
</span><span id="371" class="l"> <span class="php-comment">// Compute the length of the sequence.</span>
</span><span id="372" class="l"> <span class="php-var">$length</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">1</span>]);
</span><span id="373" class="l"> <span class="php-var">$bytes</span> = <span class="php-num">0</span>;
</span><span id="374" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$length</span> & <span class="php-num">0x80</span>)
</span><span id="375" class="l"> {
</span><span id="376" class="l"> <span class="php-var">$bytes</span> = <span class="php-var">$length</span> & <span class="php-num">0x0f</span>;
</span><span id="377" class="l"> <span class="php-var">$length</span> = <span class="php-num">0</span>;
</span><span id="378" class="l"> <span class="php-keyword1">for</span> (<span class="php-var">$i</span> = <span class="php-num">0</span>; <span class="php-var">$i</span> < <span class="php-var">$bytes</span>; <span class="php-var">$i</span> )
</span><span id="379" class="l"> {
</span><span id="380" class="l"> <span class="php-var">$length</span> = (<span class="php-var">$length</span> << <span class="php-num">8</span>) | <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-var">$i</span> <span class="php-num">2</span>]);
</span><span id="381" class="l"> }
</span><span id="382" class="l"> }
</span><span id="383" class="l"> <span class="php-comment">// Get the content of the sequence.</span>
</span><span id="384" class="l"> <span class="php-var">$contents</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derData</span>, <span class="php-num">2</span> <span class="php-var">$bytes</span>, <span class="php-var">$length</span>);
</span><span id="385" class="l">
</span><span id="386" class="l"> <span class="php-comment">// Burns the sequence.</span>
</span><span id="387" class="l"> <span class="php-var">$derData</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derData</span>, <span class="php-num">2</span> <span class="php-var">$bytes</span> <span class="php-var">$length</span>);
</span><span id="388" class="l"> <span class="php-keyword1">break</span>;
</span><span id="389" class="l">
</span><span id="390" class="l"> <span class="php-comment">// Bistream class case.</span>
</span><span id="391" class="l"> <span class="php-keyword1">case</span> <span class="php-num">0x03</span>:
</span><span id="392" class="l"> <span class="php-comment">// Compute the length of the bitstream.</span>
</span><span id="393" class="l"> <span class="php-var">$length</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">1</span>]);
</span><span id="394" class="l"> <span class="php-var">$bytes</span> = <span class="php-num">0</span>;
</span><span id="395" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$length</span> & <span class="php-num">0x80</span>)
</span><span id="396" class="l"> {
</span><span id="397" class="l"> <span class="php-var">$bytes</span> = <span class="php-var">$length</span> & <span class="php-num">0x0f</span>;
</span><span id="398" class="l"> <span class="php-var">$length</span> = <span class="php-num">0</span>;
</span><span id="399" class="l"> <span class="php-keyword1">for</span> (<span class="php-var">$i</span> = <span class="php-num">0</span>; <span class="php-var">$i</span> < <span class="php-var">$bytes</span>; <span class="php-var">$i</span> )
</span><span id="400" class="l"> {
</span><span id="401" class="l"> <span class="php-var">$length</span> = (<span class="php-var">$length</span> << <span class="php-num">8</span>) | <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-var">$i</span> <span class="php-num">2</span>]);
</span><span id="402" class="l"> }
</span><span id="403" class="l"> }
</span><span id="404" class="l">
</span><span id="405" class="l"> <span class="php-comment">// Returns the bitstream (the DER encoded signature).</span>
</span><span id="406" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword2">substr</span>(<span class="php-var">$derData</span>, <span class="php-num">3</span> <span class="php-var">$bytes</span>, <span class="php-var">$length</span>);
</span><span id="407" class="l"> <span class="php-keyword1">break</span>;
</span><span id="408" class="l">
</span><span id="409" class="l"> <span class="php-comment">// Unknown class case.</span>
</span><span id="410" class="l"> <span class="php-keyword1">default</span>:
</span><span id="411" class="l"> <span class="php-comment">// Extraction failed.</span>
</span><span id="412" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="413" class="l"> <span class="php-keyword1">break</span>;
</span><span id="414" class="l"> }
</span><span id="415" class="l"> }
</span><span id="416" class="l">
</span><span id="417" class="l"> <span class="php-comment">// Extraction failed.</span>
</span><span id="418" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="419" class="l"> }
</span><span id="420" class="l">
</span><span id="421" class="l">
</span><span id="422" class="l"> <span class="php-comment">/**
</span></span><span id="423" class="l"><span class="php-comment"> * Get DER certificate with issuer and signature sections stripped.
</span></span><span id="424" class="l"><span class="php-comment"> * The DER encoded certificate has the following structure:
</span></span><span id="425" class="l"><span class="php-comment"> * SEQUENCE
</span></span><span id="426" class="l"><span class="php-comment"> * SEQUENCE (Issuer and signature sections)
</span></span><span id="427" class="l"><span class="php-comment"> * ...
</span></span><span id="428" class="l"><span class="php-comment"> * ...
</span></span><span id="429" class="l"><span class="php-comment"> * SEQUENCE (Signature encryption algorithm OID)
</span></span><span id="430" class="l"><span class="php-comment"> * ...
</span></span><span id="431" class="l"><span class="php-comment"> * NULL
</span></span><span id="432" class="l"><span class="php-comment"> * BITSTREAM (Encrypted signature)
</span></span><span id="433" class="l"><span class="php-comment"> *
</span></span><span id="434" class="l"><span class="php-comment"> * @param string $derCertificate DER encoded certificate.
</span></span><span id="435" class="l"><span class="php-comment"> *
</span></span><span id="436" class="l"><span class="php-comment"> * @return string|false DER certificate with issuer and signature sections
</span></span><span id="437" class="l"><span class="php-comment"> * stripped on success, FALSE on failure.
</span></span><span id="438" class="l"><span class="php-comment"> */</span>
</span><span id="439" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> getHashedContent(<span class="php-var">$derCertificate</span>)
</span><span id="440" class="l"> {
</span><span id="441" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$derCertificate</span>) <span class="php-keyword1">or</span> <span class="php-keyword2">strlen</span>(<span class="php-var">$derCertificate</span>) < <span class="php-num">8</span>)
</span><span id="442" class="l"> {
</span><span id="443" class="l"> <span class="php-comment">// Invalid DER certificate.</span>
</span><span id="444" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="445" class="l"> }
</span><span id="446" class="l">
</span><span id="447" class="l"> <span class="php-comment">// Compute the length of data to strip.</span>
</span><span id="448" class="l"> <span class="php-var">$bit</span> = <span class="php-num">4</span>;
</span><span id="449" class="l"> <span class="php-var">$length</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derCertificate</span>[(<span class="php-var">$bit</span> <span class="php-num">1</span>)]);
</span><span id="450" class="l"> <span class="php-var">$bytes</span> = <span class="php-num">0</span>;
</span><span id="451" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$length</span> & <span class="php-num">0x80</span>)
</span><span id="452" class="l"> {
</span><span id="453" class="l"> <span class="php-var">$bytes</span> = <span class="php-var">$length</span> & <span class="php-num">0x0f</span>;
</span><span id="454" class="l"> <span class="php-var">$length</span> = <span class="php-num">0</span>;
</span><span id="455" class="l"> <span class="php-keyword1">for</span> (<span class="php-var">$i</span> = <span class="php-num">0</span>; <span class="php-var">$i</span> < <span class="php-var">$bytes</span>; <span class="php-var">$i</span> )
</span><span id="456" class="l"> {
</span><span id="457" class="l"> <span class="php-var">$length</span> = (<span class="php-var">$length</span> << <span class="php-num">8</span>) | <span class="php-keyword2">ord</span>(<span class="php-var">$derCertificate</span>[<span class="php-var">$bit</span> <span class="php-var">$i</span> <span class="php-num">2</span>]);
</span><span id="458" class="l"> }
</span><span id="459" class="l"> }
</span><span id="460" class="l">
</span><span id="461" class="l"> <span class="php-comment">// Returns DER certificate with issuer and signature sections stripped.</span>
</span><span id="462" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword2">substr</span>(<span class="php-var">$derCertificate</span>, <span class="php-num">4</span>, <span class="php-var">$length</span> <span class="php-num">4</span>);
</span><span id="463" class="l"> }
</span><span id="464" class="l">
</span><span id="465" class="l">
</span><span id="466" class="l"> <span class="php-comment">/**
</span></span><span id="467" class="l"><span class="php-comment"> * Get signature algorithm OID from DER encoded signature data.
</span></span><span id="468" class="l"><span class="php-comment"> * This ASN1 data should contain the following structure:
</span></span><span id="469" class="l"><span class="php-comment"> * SEQUENCE
</span></span><span id="470" class="l"><span class="php-comment"> * SEQUENCE
</span></span><span id="471" class="l"><span class="php-comment"> * OID (Signature hash algorithm)
</span></span><span id="472" class="l"><span class="php-comment"> * NULL
</span></span><span id="473" class="l"><span class="php-comment"> * OCTET STRING (Signature hash)
</span></span><span id="474" class="l"><span class="php-comment"> *
</span></span><span id="475" class="l"><span class="php-comment"> * @param string $derSignatureData DER encoded signature data.
</span></span><span id="476" class="l"><span class="php-comment"> *
</span></span><span id="477" class="l"><span class="php-comment"> * @return string|false The signature algorithm OID, FALSE on failure.
</span></span><span id="478" class="l"><span class="php-comment"> */</span>
</span><span id="479" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> getSignatureAlgorithmOid(<span class="php-var">$derSignatureData</span>)
</span><span id="480" class="l"> {
</span><span id="481" class="l"> <span class="php-comment">// Validate this is the DER encoded singature we need.</span>
</span><span id="482" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$derSignatureData</span>) <span class="php-keyword1">or</span> <span class="php-keyword2">strlen</span>(<span class="php-var">$derSignatureData</span>) < <span class="php-num">5</span>)
</span><span id="483" class="l"> {
</span><span id="484" class="l"> <span class="php-comment">// Invalid DER data.</span>
</span><span id="485" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="486" class="l"> }
</span><span id="487" class="l">
</span><span id="488" class="l"> <span class="php-var">$bit_seq1</span> = <span class="php-num">0</span>;
</span><span id="489" class="l"> <span class="php-var">$bit_seq2</span> = <span class="php-num">2</span>;
</span><span id="490" class="l"> <span class="php-var">$bit_oid</span> = <span class="php-num">4</span>;
</span><span id="491" class="l">
</span><span id="492" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">ord</span>(<span class="php-var">$derSignatureData</span>[<span class="php-var">$bit_seq1</span>]) !== <span class="php-num">0x30</span>)
</span><span id="493" class="l"> {
</span><span id="494" class="l"> <span class="php-comment">// Invalid DER certificate.</span>
</span><span id="495" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="496" class="l"> }
</span><span id="497" class="l">
</span><span id="498" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">ord</span>(<span class="php-var">$derSignatureData</span>[<span class="php-var">$bit_seq2</span>]) !== <span class="php-num">0x30</span>)
</span><span id="499" class="l"> {
</span><span id="500" class="l"> <span class="php-comment">// Invalid DER certificate.</span>
</span><span id="501" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="502" class="l"> }
</span><span id="503" class="l">
</span><span id="504" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">ord</span>(<span class="php-var">$derSignatureData</span>[<span class="php-var">$bit_oid</span>]) !== <span class="php-num">0x06</span>)
</span><span id="505" class="l"> {
</span><span id="506" class="l"> <span class="php-comment">// Invalid DER certificate.</span>
</span><span id="507" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="508" class="l"> }
</span><span id="509" class="l">
</span><span id="510" class="l"> <span class="php-comment">// Strip out what we don't need.</span>
</span><span id="511" class="l"> <span class="php-var">$derData</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derSignatureData</span>, <span class="php-var">$bit_oid</span>);
</span><span id="512" class="l">
</span><span id="513" class="l"> <span class="php-comment">// Get the algorithm OID.</span>
</span><span id="514" class="l"> <span class="php-var">$length</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">1</span>]);
</span><span id="515" class="l"> <span class="php-var">$bytes</span> = <span class="php-num">0</span>;
</span><span id="516" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$length</span> & <span class="php-num">0x80</span>)
</span><span id="517" class="l"> {
</span><span id="518" class="l"> <span class="php-var">$bytes</span> = <span class="php-var">$length</span> & <span class="php-num">0x0f</span>;
</span><span id="519" class="l"> <span class="php-var">$length</span> = <span class="php-num">0</span>;
</span><span id="520" class="l"> <span class="php-keyword1">for</span> (<span class="php-var">$i</span> = <span class="php-num">0</span>; <span class="php-var">$i</span> < <span class="php-var">$bytes</span>; <span class="php-var">$i</span> )
</span><span id="521" class="l"> {
</span><span id="522" class="l"> <span class="php-var">$length</span> = (<span class="php-var">$length</span> << <span class="php-num">8</span>) | <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-var">$i</span> <span class="php-num">2</span>]);
</span><span id="523" class="l"> }
</span><span id="524" class="l"> }
</span><span id="525" class="l"> <span class="php-var">$oidData</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derData</span>, <span class="php-num">2</span> <span class="php-var">$bytes</span>, <span class="php-var">$length</span>);
</span><span id="526" class="l">
</span><span id="527" class="l"> <span class="php-comment">// Unpack the algorithm OID.</span>
</span><span id="528" class="l"> <span class="php-var">$oid</span> = <span class="php-keyword2">floor</span>(<span class="php-keyword2">ord</span>(<span class="php-var">$oidData</span>[<span class="php-num">0</span>])/<span class="php-num">40</span>);
</span><span id="529" class="l"> <span class="php-var">$oid</span> .= <span class="php-quote">'.'</span> . <span class="php-keyword2">ord</span>(<span class="php-var">$oidData</span>[<span class="php-num">0</span>]) % <span class="php-num">40</span>;
</span><span id="530" class="l"> <span class="php-var">$value</span> = <span class="php-num">0</span>;
</span><span id="531" class="l"> <span class="php-var">$i</span> = <span class="php-num">1</span>;
</span><span id="532" class="l"> <span class="php-keyword1">while</span> (<span class="php-var">$i</span> < <span class="php-keyword2">strlen</span>(<span class="php-var">$oidData</span>))
</span><span id="533" class="l"> {
</span><span id="534" class="l"> <span class="php-var">$value</span> = <span class="php-var">$value</span> << <span class="php-num">7</span>;
</span><span id="535" class="l"> <span class="php-var">$value</span> = <span class="php-var">$value</span> | (<span class="php-keyword2">ord</span>(<span class="php-var">$oidData</span>[<span class="php-var">$i</span>]) & <span class="php-num">0x7f</span>);
</span><span id="536" class="l"> <span class="php-keyword1">if</span> (!(<span class="php-keyword2">ord</span>(<span class="php-var">$oidData</span>[<span class="php-var">$i</span>]) & <span class="php-num">0x80</span>))
</span><span id="537" class="l"> {
</span><span id="538" class="l"> <span class="php-var">$oid</span> .= <span class="php-quote">'.'</span> . <span class="php-var">$value</span>;
</span><span id="539" class="l"> <span class="php-var">$value</span> = <span class="php-num">0</span>;
</span><span id="540" class="l"> }
</span><span id="541" class="l"> <span class="php-var">$i</span> ;
</span><span id="542" class="l"> }
</span><span id="543" class="l">
</span><span id="544" class="l"> <span class="php-comment">// Returns the algorithm OID.</span>
</span><span id="545" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$oid</span>;
</span><span id="546" class="l"> }
</span><span id="547" class="l">
</span><span id="548" class="l">
</span><span id="549" class="l"> <span class="php-comment">/**
</span></span><span id="550" class="l"><span class="php-comment"> * Get signature hash from a DER encoded signature data.
</span></span><span id="551" class="l"><span class="php-comment"> * This is ASN1 data that should contain the following structure:
</span></span><span id="552" class="l"><span class="php-comment"> * SEQUENCE
</span></span><span id="553" class="l"><span class="php-comment"> * SEQUENCE
</span></span><span id="554" class="l"><span class="php-comment"> * OID (Signature hash algorithm)
</span></span><span id="555" class="l"><span class="php-comment"> * NULL
</span></span><span id="556" class="l"><span class="php-comment"> * OCTET STRING (Signature hash)
</span></span><span id="557" class="l"><span class="php-comment"> *
</span></span><span id="558" class="l"><span class="php-comment"> * @param string $derSignatureData Decrypted DER encoded signature data.
</span></span><span id="559" class="l"><span class="php-comment"> *
</span></span><span id="560" class="l"><span class="php-comment"> * @return string|false The signature hash, FALSE on failure.
</span></span><span id="561" class="l"><span class="php-comment"> */</span>
</span><span id="562" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">private</span> <span class="php-keyword1">function</span> getSignatureHash(<span class="php-var">$derSignatureData</span>)
</span><span id="563" class="l"> {
</span><span id="564" class="l"> <span class="php-comment">// Validate this is the DER encoded singature we need.</span>
</span><span id="565" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$derSignatureData</span>) <span class="php-keyword1">or</span> <span class="php-keyword2">strlen</span>(<span class="php-var">$derSignatureData</span>) < <span class="php-num">5</span>)
</span><span id="566" class="l"> {
</span><span id="567" class="l"> <span class="php-comment">// Invalid DER data.</span>
</span><span id="568" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="569" class="l"> }
</span><span id="570" class="l">
</span><span id="571" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">ord</span>(<span class="php-var">$derSignatureData</span>[<span class="php-num">0</span>]) !== <span class="php-num">0x30</span>)
</span><span id="572" class="l"> {
</span><span id="573" class="l"> <span class="php-comment">// Invalid DER data.</span>
</span><span id="574" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="575" class="l"> }
</span><span id="576" class="l">
</span><span id="577" class="l"> <span class="php-comment">// Strip out the container sequence.</span>
</span><span id="578" class="l"> <span class="php-var">$derData</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derSignatureData</span>, <span class="php-num">2</span>);
</span><span id="579" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">0</span>]) !== <span class="php-num">0x30</span>)
</span><span id="580" class="l"> {
</span><span id="581" class="l"> <span class="php-comment">// Invalid DER certificate.</span>
</span><span id="582" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="583" class="l"> }
</span><span id="584" class="l">
</span><span id="585" class="l"> <span class="php-comment">// Compute the length of the first sequence to strip out.</span>
</span><span id="586" class="l"> <span class="php-var">$length</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">1</span>]);
</span><span id="587" class="l"> <span class="php-var">$bytes</span> = <span class="php-num">0</span>;
</span><span id="588" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$length</span> & <span class="php-num">0x80</span>)
</span><span id="589" class="l"> {
</span><span id="590" class="l"> <span class="php-var">$bytes</span> = <span class="php-var">$length</span> & <span class="php-num">0x0f</span>;
</span><span id="591" class="l"> <span class="php-var">$length</span> = <span class="php-num">0</span>;
</span><span id="592" class="l"> <span class="php-keyword1">for</span> (<span class="php-var">$i</span> = <span class="php-num">0</span>; <span class="php-var">$i</span> < <span class="php-var">$bytes</span>; <span class="php-var">$i</span> )
</span><span id="593" class="l"> {
</span><span id="863" class="l"> <span class="php-var">$length</span> = (<span class="php-var">$length</span> << <span class="php-num">8</span>) | <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-var">$i</span> <span class="php-num">2</span>]);
</span><span id="595" class="l"> }
</span><span id="596" class="l"> }
</span><span id="597" class="l">
</span><span id="598" class="l"> <span class="php-comment">// Strip out the first sequence.</span>
</span><span id="599" class="l"> <span class="php-var">$derData</span> = <span class="php-keyword2">substr</span>(<span class="php-var">$derData</span>, <span class="php-num">2</span> <span class="php-var">$bytes</span> <span class="php-var">$length</span>);
</span><span id="600" class="l">
</span><span id="601" class="l"> <span class="php-comment">// Now we should have an octet string.</span>
</span><span id="602" class="l"> <span class="php-keyword1">if</span> (<span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">0</span>]) !== <span class="php-num">0x04</span>)
</span><span id="603" class="l"> {
</span><span id="604" class="l"> <span class="php-comment">// Invalid DER data.</span>
</span><span id="605" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="606" class="l"> }
</span><span id="607" class="l">
</span><span id="608" class="l"> <span class="php-comment">// Compute the length of the octet string.</span>
</span><span id="609" class="l"> <span class="php-var">$length</span> = <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-num">1</span>]);
</span><span id="610" class="l"> <span class="php-var">$bytes</span> = <span class="php-num">0</span>;
</span><span id="611" class="l"> <span class="php-keyword1">if</span> (<span class="php-var">$length</span> & <span class="php-num">0x80</span>)
</span><span id="612" class="l"> {
</span><span id="613" class="l"> <span class="php-var">$bytes</span> = <span class="php-var">$length</span> & <span class="php-num">0x0f</span>;
</span><span id="614" class="l"> <span class="php-var">$length</span> = <span class="php-num">0</span>;
</span><span id="615" class="l"> <span class="php-keyword1">for</span> (<span class="php-var">$i</span> = <span class="php-num">0</span>; <span class="php-var">$i</span> < <span class="php-var">$bytes</span>; <span class="php-var">$i</span> )
</span><span id="616" class="l"> {
</span><span id="617" class="l"> <span class="php-var">$length</span> = (<span class="php-var">$length</span> << <span class="php-num">8</span>) | <span class="php-keyword2">ord</span>(<span class="php-var">$derData</span>[<span class="php-var">$i</span> <span class="php-num">2</span>]);
</span><span id="618" class="l"> }
</span><span id="619" class="l"> }
</span><span id="620" class="l">
</span><span id="621" class="l"> <span class="php-comment">// Returns the signature hash.</span>
</span><span id="622" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword2">bin2hex</span>(<span class="php-keyword2">substr</span>(<span class="php-var">$derData</span>, <span class="php-num">2</span> <span class="php-var">$bytes</span>, <span class="php-var">$length</span>));
</span><span id="623" class="l"> }
</span><span id="624" class="l">
</span><span id="625" class="l">
</span><span id="626" class="l"> <span class="php-comment">/**
</span></span><span id="627" class="l"><span class="php-comment"> * Convert PEM encoded X.509 certificate to DER encoding.
</span></span><span id="628" class="l"><span class="php-comment"> *
</span></span><span id="629" class="l"><span class="php-comment"> * @param string $pemCertificate PEM encoded X.509 certificate.
</span></span><span id="630" class="l"><span class="php-comment"> *
</span></span><span id="631" class="l"><span class="php-comment"> * @return string|false DER encoded X.509 certificate on success,
</span></span><span id="632" class="l"><span class="php-comment"> * FALSE on failure.
</span></span><span id="633" class="l"><span class="php-comment"> */</span>
</span><span id="634" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> pemToDer(<span class="php-var">$pemCertificate</span>)
</span><span id="635" class="l"> {
</span><span id="636" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$pemCertificate</span>))
</span><span id="637" class="l"> {
</span><span id="638" class="l"> <span class="php-comment">// Invalid parameter.</span>
</span><span id="639" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="640" class="l"> }
</span><span id="641" class="l">
</span><span id="642" class="l"> <span class="php-var">$pattern</span> = <span class="php-quote">'/(-----((BEGIN)|(END)) CERTIFICATE-----)/'</span>;
</span><span id="643" class="l"> <span class="php-var">$base64Content</span> = <span class="php-keyword2">preg_split</span>(<span class="php-var">$pattern</span>, <span class="php-var">$pemCertificate</span>);
</span><span id="644" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword1">isset</span>(<span class="php-var">$base64Content</span>[<span class="php-num">1</span>]))
</span><span id="645" class="l"> {
</span><span id="646" class="l"> <span class="php-comment">// Invalid PEM certificate.</span>
</span><span id="647" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="648" class="l"> }
</span><span id="649" class="l">
</span><span id="650" class="l"> <span class="php-comment">// Returns the DER encoded certificate.</span>
</span><span id="651" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword2">base64_decode</span>(<span class="php-var">$base64Content</span>[<span class="php-num">1</span>]);
</span><span id="652" class="l"> }
</span><span id="653" class="l">
</span><span id="654" class="l">
</span><span id="655" class="l"> <span class="php-comment">/**
</span></span><span id="656" class="l"><span class="php-comment"> * Convert DER encoded X.509 certificate to PEM encoding.
</span></span><span id="657" class="l"><span class="php-comment"> *
</span></span><span id="658" class="l"><span class="php-comment"> * @param string $derCertificate DER encoded X.509 certificate.
</span></span><span id="659" class="l"><span class="php-comment"> *
</span></span><span id="660" class="l"><span class="php-comment"> * @return string|false PEM encoded X.509 certificate on success,
</span></span><span id="661" class="l"><span class="php-comment"> * FALSE on failure.
</span></span><span id="662" class="l"><span class="php-comment"> */</span>
</span><span id="663" class="l"> <span class="php-keyword1">static</span> <span class="php-keyword1">public</span> <span class="php-keyword1">function</span> derToPem(<span class="php-var">$derCertificate</span>)
</span><span id="664" class="l"> {
</span><span id="665" class="l"> <span class="php-keyword1">if</span> (!<span class="php-keyword2">is_string</span>(<span class="php-var">$derCertificate</span>))
</span><span id="666" class="l"> {
</span><span id="667" class="l"> <span class="php-comment">// Invalid parameter.</span>
</span><span id="668" class="l"> <span class="php-keyword1">return</span> <span class="php-keyword1">false</span>;
</span><span id="669" class="l"> }
</span><span id="670" class="l">
</span><span id="671" class="l"> <span class="php-var">$b64DerCert</span> = <span class="php-keyword2">base64_encode</span>(<span class="php-var">$derCertificate</span>);
</span><span id="672" class="l"> <span class="php-var">$pem</span> = <span class="php-quote">"-----BEGIN CERTIFICATE-----\n"</span>;
</span><span id="673" class="l"> <span class="php-var">$pem</span> .= <span class="php-keyword2">implode</span>(<span class="php-quote">"\n"</span>, <span class="php-keyword2">str_split</span>(<span class="php-var">$b64DerCert</span>, <span class="php-num">65</span>)) . <span class="php-quote">"\n"</span>;
</span><span id="674" class="l"> <span class="php-var">$pem</span> .= <span class="php-quote">"-----END CERTIFICATE-----\n"</span>;
</span><span id="675" class="l">
</span><span id="676" class="l"> <span class="php-keyword1">return</span> <span class="php-var">$pem</span>;
</span><span id="677" class="l"> }
</span><span id="678" class="l">}
</span><span id="679" class="l"></span></code></pre>
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