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

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  <refentry id="function.openssl-sign">
   <refnamediv>
    <refname>openssl_sign</refname>
    <refpurpose>Generate signature</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>openssl_sign</methodname>
      <methodparam><type>string</type><parameter>data</parameter></methodparam>
      <methodparam><type>string</type><parameter>&amp;signature</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>priv_key_id</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>signature_alg</parameter></methodparam>
     </methodsynopsis>
    &warn.experimental.func;
    <para>
     &return.success;
     If successful the signature is returned in
     <parameter>signature</parameter>. 
    </para>
    <para>
     <function>openssl_sign</function> computes a signature for the
     specified <parameter>data</parameter> by using SHA1 for hashing
     followed by encryption using the private key associated with
     <parameter>priv_key_id</parameter>. Note that the data itself is
     not encrypted.
    </para>
    <para>
     <example>
      <title><function>openssl_sign</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
// $data is assumed to contain the data to be signed

// fetch private key from file and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/key.pem", "r");
$priv_key = fread($fp, 8192);
fclose($fp);
$pkeyid = openssl_get_privatekey($priv_key);

// compute signature
openssl_sign($data, $signature, $pkeyid);

// free the key from memory
openssl_free_key($pkeyid);
?>
]]>
      </programlisting>
     </example>
    </para>
    <simpara>
     See also <function>openssl_verify</function>.
    </simpara>
   </refsect1>
  </refentry>

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