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<refentry xml:id="function.openssl-cms-encrypt" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>openssl_cms_encrypt</refname>
  <refpurpose>Encrypt a CMS message</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>openssl_cms_encrypt</methodname>
   <methodparam><type>string</type><parameter>input_filename</parameter></methodparam>
   <methodparam><type>string</type><parameter>output_filename</parameter></methodparam>
   <methodparam><type class="union"><type>OpenSSLCertificate</type><type>array</type><type>string</type></type><parameter>certificate</parameter></methodparam>
   <methodparam><type class="union"><type>array</type><type>null</type></type><parameter>headers</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>encoding</parameter><initializer><constant>OPENSSL_ENCODING_SMIME</constant></initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>cipher_algo</parameter><initializer><constant>OPENSSL_CIPHER_AES_128_CBC</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   This function encrypts content to one or more recipients,
   based on the certificates that are passed to it.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>input_filename</parameter></term>
    <listitem>
     <para>
       The file to be encrypted.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>output_filename</parameter></term>
    <listitem>
     <para>
      The output file.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>certificate</parameter></term>
    <listitem>
     <para>
      Recipients to encrypt to.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>headers</parameter></term>
    <listitem>
     <para>
      Headers to include when S/MIME is used.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>flags</parameter></term>
    <listitem>
     <para>
      Flags to be passed to CMS_sign.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>encoding</parameter></term>
    <listitem>
     <para>
      An encoding to output. One of <constant>OPENSSL_ENCODING_SMIME</constant>,
      <constant>OPENSSL_ENCODING_DER</constant> or <constant>OPENSSL_ENCODING_PEM</constant>.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>cipher_algo</parameter></term>
    <listitem>
     <para>
      A cypher to use.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.1.0</entry>
      <entry>
       The default cipher algorithm (<parameter>cipher_algo</parameter>) is now
       AES-128-CBC (<constant>OPENSSL_CIPHER_AES_128_CBC</constant>). Previously,
       PKCS7/CMS was used (<constant>OPENSSL_CIPHER_RC2_40</constant>).
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

</refentry>
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