php-doc-en/reference/openssl/functions/openssl-seal.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.openssl-seal">
 <refnamediv>
  <refname>openssl_seal</refname>
  <refpurpose>Seal (encrypt) data</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>openssl_seal</methodname>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
   <methodparam><type>string</type><parameter role="reference">sealed_data</parameter></methodparam>
   <methodparam><type>array</type><parameter role="reference">env_keys</parameter></methodparam>
   <methodparam><type>array</type><parameter>pub_key_ids</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>openssl_seal</function> seals (encrypts)
   <parameter>data</parameter> by using RC4 with a randomly generated
   secret key. The key is encrypted with each of the public keys
   associated with the identifiers in <parameter>pub_key_ids</parameter>
   and each encrypted key is returned
   in <parameter>env_keys</parameter>. This means that one can send
   sealed data to multiple recipients (provided one has obtained their
   public keys). Each recipient must receive both the sealed data and
   the envelope key that was encrypted with the recipient's public key.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>sealed_data</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>env_keys</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>pub_key_ids</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the length of the sealed data on success, or &false; on error.
   If successful the sealed data is returned in
   <parameter>sealed_data</parameter>, and the envelope keys in
   <parameter>env_keys</parameter>.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>openssl_seal</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
// $data is assumed to contain the data to be sealed

// fetch public keys for our recipients, and ready them
$fp = fopen("/src/openssl-0.9.6/demos/maurice/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pk1 = openssl_get_publickey($cert);
// Repeat for second recipient
$fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pk2 = openssl_get_publickey($cert);

// seal message, only owners of $pk1 and $pk2 can decrypt $sealed with keys
// $ekeys[0] and $ekeys[1] respectively.
openssl_seal($data, $sealed, $ekeys, array($pk1, $pk2));

// free the keys from memory
openssl_free_key($pk1);
openssl_free_key($pk2);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

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

</refentry>

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