php-doc-en/reference/openssl/functions/openssl-x509-verify.xml

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<refentry xml:id="function.openssl-x509-verify" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>openssl_x509_verify</refname>
  <refpurpose>Verifies digital signature of x509 certificate against a public key</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>openssl_x509_verify</methodname>
   <methodparam><type class="union"><type>OpenSSLCertificate</type><type>string</type></type><parameter>certificate</parameter></methodparam>
   <methodparam><type class="union"><type>OpenSSLAsymmetricKey</type><type>OpenSSLCertificate</type><type>array</type><type>string</type></type><parameter>public_key</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>openssl_x509_verify</function> verifies that the 
   <parameter>certificate</parameter> certificate was signed by the private 
   key corresponding to public key <parameter>public_key</parameter>.  
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &openssl.param.x509;
    <varlistentry>
     <term><parameter>public_key</parameter></term>
     <listitem>
      <para>
       <classname>OpenSSLAsymmetricKey</classname> - a key, returned by <function>openssl_get_publickey</function>
      </para>
      <para>
       <type>string</type> - a PEM formatted key, example, "-----BEGIN PUBLIC KEY-----
MIIBCgK..."
      </para>     
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns 1 if the signature is correct, 0 if it is incorrect, and
   -1 on error.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>certificate</parameter> accepts an <classname>OpenSSLCertificate</classname> instance now;
       previously, a &resource; of type <literal>OpenSSL X.509</literal> was accepted.
      </entry>
     </row>
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>public_key</parameter> accepts an <classname>OpenSSLAsymmetricKey</classname>
       or <classname>OpenSSLCertificate</classname> instance now;
       previously, a &resource; of type <literal>OpenSSL key</literal> or <literal>OpenSSL X.509</literal>
       was accepted.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>openssl_x509_verify</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$hostname = "news.php.net";
$ssloptions = array(
    "capture_peer_cert" => true, 
    "capture_peer_cert_chain" => true, 
    "allow_self_signed"=> false, 
    "CN_match" => $hostname,
    "verify_peer" => true,
    "SNI_enabled" => true,
    "SNI_server_name" => $hostname,
);
 
$ctx = stream_context_create( array("ssl" => $ssloptions) );
$result = stream_socket_client("ssl://$hostname:443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $ctx);
$cont = stream_context_get_params($result);
$x509 = $cont["options"]["ssl"]["peer_certificate"];
$certparsed = openssl_x509_parse($x509);

foreach($cont["options"]["ssl"]["peer_certificate_chain"] as $chaincert)
{
    $chainparsed = openssl_x509_parse($chaincert);
    $chain_public_key = openssl_get_publickey($chaincert);
    $r = openssl_x509_verify($x509, $chain_public_key);   
    if ($r==1)
    {
        echo $certparsed['subject']['CN'];
        echo " was digitally signed by ";
        echo $chainparsed['subject']['CN']."\n";
    }
}
?>
]]>
    </programlisting>
   </example>

  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>openssl_verify</function></member>
    <member><function>openssl_get_publickey</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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