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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<!-- splitted from ./en/functions/openssl.xml, last change in rev 1.1 -->
<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 role="reference">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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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
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sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
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End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
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