php-doc-en/reference/openssl/functions/openssl-pkcs7-sign.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.openssl-pkcs7-sign">
 <refnamediv>
  <refname>openssl_pkcs7_sign</refname>
  <refpurpose>Sign an S/MIME message</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>openssl_pkcs7_sign</methodname>
   <methodparam><type>string</type><parameter>infilename</parameter></methodparam>
   <methodparam><type>string</type><parameter>outfilename</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>signcert</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>privkey</parameter></methodparam>
   <methodparam><type>array</type><parameter>headers</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>PKCS7_DETACHED</initializer></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>extracerts</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>openssl_pkcs7_sign</function> takes the contents of the file
   named <parameter>infilename</parameter> and signs them using the
   certificate and its matching private key specified by
   <parameter>signcert</parameter> and <parameter>privkey</parameter>
   parameters.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>infilename</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>outfilename</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>signcert</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>privkey</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>headers</parameter></term>
     <listitem>
      <para>
       <parameter>headers</parameter> is an array of headers that
       will be prepended to the data after it has been signed (see
       <function>openssl_pkcs7_encrypt</function> for more information about
       the format of this parameter).
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       <parameter>flags</parameter> can be used to alter the output - see <link
       linkend="openssl.pkcs7.flags">PKCS7 constants</link>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>extracerts</parameter></term>
     <listitem>
      <para>
       <parameter>extracerts</parameter> specifies the name of a file containing
       a bunch of extra certificates to include in the signature which can for
       example be used to help the recipient to verify the certificate that you used.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

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

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>openssl_pkcs7_sign</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
// the message you want to sign so that recipient can be sure it was you that
// sent it
$data = <<<EOD

You have my authorization to spend $10,000 on dinner expenses.

The CEO
EOD;
// save message to file
$fp = fopen("msg.txt", "w");
fwrite($fp, $data);
fclose($fp);
// encrypt it
if (openssl_pkcs7_sign("msg.txt", "signed.txt", "mycert.pem",
    array("file://mycert.pem", "mypassphrase"),
    array("To" => "joes@example.com", // keyed syntax
          "From: HQ <ceo@example.com>", // indexed syntax
          "Subject" => "Eyes only")
    )) {
    // message signed - send it!
    exec(ini_get("sendmail_path") . " < signed.txt");
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

</refentry>

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