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  <refentry id="function.openssl-pkcs7-encrypt">
   <refnamediv>
    <refname>openssl_pkcs7_encrypt</refname>
    <refpurpose>Encrypt an S/MIME message</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>openssl_pkcs7_encrypt</methodname>
      <methodparam><type>string</type><parameter>infile</parameter></methodparam>
      <methodparam><type>string</type><parameter>outfile</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>recipcerts</parameter></methodparam>
      <methodparam><type>array</type><parameter>headers</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>flags</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>openssl_pkcs7_encrypt</function> takes the contents of the
     file named <parameter>infile</parameter> and encrypts them using an RC2
     40-bit cipher so that they can only be read by the intended recipients
     specified by <parameter>recipcerts</parameter>, which is either a
     lone X.509 certificate, or an array of X.509 certificates.
     <parameter>headers</parameter> is an array of headers that
     will be prepended to the data after it has been encrypted.
     <parameter>flags</parameter> can be used to specify options that affect
     the encoding process - see <link linkend="openssl.pkcs7.flags">PKCS7
     constants</link>.
     <parameter>headers</parameter> can be either an associative array
     keyed by header name, or an indexed array, where each element contains
     a single header line.
    </para>
    <para>
     <example>
      <title><function>openssl_pkcs7_encrypt</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
// the message you want to encrypt and send to your secret agent
// in the field, known as nighthawk.  You have his certificate
// in the file nighthawk.pem
$data = <<<EOD
Nighthawk,

Top secret, for your eyes only!

The enemy is closing in! Meet me at the cafe at 8.30am
to collect your forged passport!

HQ
EOD;

// load key
$key = file_get_contents("nighthawk.pem");

// save message to file
$fp = fopen("msg.txt", "w");
fwrite($fp, $data);
fclose($fp);

// encrypt it
if (openssl_pkcs7_encrypt("msg.txt", "enc.txt", $key,
    array("To" => "nighthawk@example.com", // keyed syntax
          "From: HQ <hq@example.com>", // indexed syntax
          "Subject" => "Eyes only")))
{
    // message encrypted - send it!
    exec(ini_get("sendmail_path") . " < enc.txt");
}
?>
]]>
      </programlisting>
     </example>
    </para>

   </refsect1>
  </refentry>

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