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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.openssl-x509-checkpurpose">
 <refnamediv>
  <refname>openssl_x509_checkpurpose</refname>
  <refpurpose>Verifies if a certificate can be used for a particular purpose</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>openssl_x509_checkpurpose</methodname>
   <methodparam><type>mixed</type><parameter>x509cert</parameter></methodparam>
   <methodparam><type>int</type><parameter>purpose</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>cainfo</parameter><initializer>array()</initializer></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>untrustedfile</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>openssl_x509_checkpurpose</function> examines a certificate to
   see if it can be used for the specified <parameter>purpose</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>x509cert</parameter></term>
     <listitem>
      <para>
       The examined certificate.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>purpose</parameter></term>
     <listitem>
      <para>
       <table>
        <title><function>openssl_x509_checkpurpose</function> purposes</title>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>Constant</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry>X509_PURPOSE_SSL_CLIENT</entry>
           <entry>Can the certificate be used for the client side of an SSL
           connection?</entry>
          </row>
          <row>
           <entry>X509_PURPOSE_SSL_SERVER</entry>
           <entry>Can the certificate be used for the server side of an SSL
           connection?</entry>
          </row>
          <row>
           <entry>X509_PURPOSE_NS_SSL_SERVER</entry>
           <entry>Can the cert be used for Netscape SSL server?</entry>
          </row>
          <row>
           <entry>X509_PURPOSE_SMIME_SIGN</entry>
           <entry>Can the cert be used to sign S/MIME email?</entry>
          </row>
          <row>
           <entry>X509_PURPOSE_SMIME_ENCRYPT</entry>
           <entry>Can the cert be used to encrypt S/MIME email?</entry>
          </row>
          <row>
           <entry>X509_PURPOSE_CRL_SIGN</entry>
           <entry>Can the cert be used to sign a certificate revocation list
           (CRL)?</entry>
          </row>
          <row>
           <entry>X509_PURPOSE_ANY</entry>
           <entry>Can the cert be used for Any/All purposes?</entry>
          </row>
         </tbody>
        </tgroup>
       </table>
       These options are not bitfields - you may specify one only!
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>cainfo</parameter></term>
     <listitem>
      <para>
       <parameter>cainfo</parameter> should be an array of trusted CA files/dirs
       as described in <link linkend="openssl.cert.verification">Certificate
       Verification</link>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>untrustedfile</parameter></term>
     <listitem>
      <para>
       If specified, this should be the name of a PEM encoded file holding
       certificates that can be used to help verify the certificate, although
       no trust is placed in the certificates that come from that file.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if the certificate can be used for the intended purpose,
   &false; if it cannot, or -1 on error.
  </para>
 </refsect1>

</refentry>

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