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<refentry xml:id="function.stream-socket-enable-crypto" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stream_socket_enable_crypto</refname>
  <refpurpose>Turns encryption on/off on an already connected socket</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>int</type><type>bool</type></type><methodname>stream_socket_enable_crypto</methodname>
   <methodparam><type>resource</type><parameter>stream</parameter></methodparam>
   <methodparam><type>bool</type><parameter>enable</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>crypto_method</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>resource</type><type>null</type></type><parameter>session_stream</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>

  <simpara>
   Enable or disable encryption on the stream.
  </simpara>

  <simpara>
   Once the crypto settings are established, cryptography can be turned
   on and off dynamically by passing &true; or &false; in the
   <parameter>enable</parameter> parameter.
  </simpara>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>stream</parameter></term>
     <listitem>
      <para>
       The stream resource.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>enable</parameter></term>
     <listitem>
      <para>
       Enable/disable cryptography on the stream.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>crypto_method</parameter></term>
     <listitem>
      <para>
       Setup encryption on the stream.
       Valid methods are
       <itemizedlist>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_SSLv2_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_SSLv3_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_SSLv23_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_ANY_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLS_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT</constant> (as of PHP 7.4.0)</simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_SSLv2_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_SSLv3_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_SSLv23_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_ANY_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLS_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_0_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_1_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_2_SERVER</constant></simpara></listitem>
        <listitem><simpara><constant>STREAM_CRYPTO_METHOD_TLSv1_3_SERVER</constant> (as of PHP 7.4.0)</simpara></listitem>
       </itemizedlist>
      </para>
      <para>
       If omitted, the <literal>crypto_method</literal> context option on
       the stream's SSL context will be used instead.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>session_stream</parameter></term>
     <listitem>
      <para>
       Seed the stream with settings from <parameter>session_stream</parameter>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; on success, &false; if negotiation has failed or
   <literal>0</literal> if there isn't enough data and you should try again
   (only for non-blocking sockets).
  </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>session_stream</parameter> is now nullable.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>
 
 <refsect1 role="examples"><!-- {{{ -->
  &reftitle.examples;
  <para>
   <example xml:id="stream-socket-enable-crypto.example.basic"><!-- {{{ -->
    <title><function>stream_socket_enable_crypto</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$fp = stream_socket_client("tcp://myproto.example.com:31337", $errno, $errstr, 30);
if (!$fp) {
    die("Unable to connect: $errstr ($errno)");
}

/* Turn on encryption for login phase */
stream_socket_enable_crypto($fp, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
fwrite($fp, "USER god\r\n");
fwrite($fp, "PASS secret\r\n");

/* Turn off encryption for the rest */
stream_socket_enable_crypto($fp, false);

while ($motd = fgets($fp)) {
    echo $motd;
}

fclose($fp);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
]]>
    </screen>
   </example><!-- }}} -->
  </para>
 </refsect1><!-- }}} -->
 
 <refsect1 role="seealso"><!-- {{{ -->
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><xref linkend="ref.openssl"/></member>
    <member><xref linkend="transports"/></member>
   </simplelist>
  </para>
 </refsect1><!-- }}} -->

</refentry>
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