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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.openssl-sign" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>openssl_sign</refname>
<refpurpose>Generate signature</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<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><modifier role="attribute">#[\SensitiveParameter]</modifier><type class="union"><type>OpenSSLAsymmetricKey</type><type>OpenSSLCertificate</type><type>array</type><type>string</type></type><parameter>private_key</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>string</type><type>int</type></type><parameter>algorithm</parameter><initializer><constant>OPENSSL_ALGO_SHA1</constant></initializer></methodparam>
</methodsynopsis>
<para>
<function>openssl_sign</function> computes a signature for the
specified <parameter>data</parameter> by generating a cryptographic
digital signature using the private key associated with
<parameter>private_key</parameter>. Note that the data itself is
not encrypted.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<para>
The string of data you wish to sign
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>signature</parameter></term>
<listitem>
<para>
If the call was successful the signature is returned in
<parameter>signature</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>private_key</parameter></term>
<listitem>
<para>
<classname>OpenSSLAsymmetricKey</classname> - a key, returned by <function>openssl_get_privatekey</function>
</para>
<para>
<type>string</type> - a <acronym>PEM</acronym> formatted key
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>algorithm</parameter></term>
<listitem>
<para>
<type>int</type> - one of these <link linkend="openssl.signature-algos">Signature Algorithms</link>.
</para>
<para>
<type>string</type> - a valid string returned by <function>openssl_get_md_methods</function> example, "sha256WithRSAEncryption" or "sha384".
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</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>8.0.0</entry>
<entry>
<parameter>private_key</parameter> accepts an <classname>OpenSSLAsymmetricKey</classname>
or <classname>OpenSSLCertificate</classname> instance now;
previously, a &resource; of type <literal>OpenSSL key</literal> or <literal>OpenSSL X.509</literal>
was accepted.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<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
$pkeyid = openssl_pkey_get_private("file://src/openssl-0.9.6/demos/sign/key.pem");
// compute signature
openssl_sign($data, $signature, $pkeyid);
// free the key from memory
openssl_free_key($pkeyid);
?>
]]>
</programlisting>
</example>
<example>
<title><function>openssl_sign</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
//data you want to sign
$data = 'my data';
//create new private and public key
$new_key_pair = openssl_pkey_new(array(
"private_key_bits" => 2048,
"private_key_type" => OPENSSL_KEYTYPE_RSA,
));
openssl_pkey_export($new_key_pair, $private_key_pem);
$details = openssl_pkey_get_details($new_key_pair);
$public_key_pem = $details['key'];
//create signature
openssl_sign($data, $signature, $private_key_pem, OPENSSL_ALGO_SHA256);
//save for later
file_put_contents('private_key.pem', $private_key_pem);
file_put_contents('public_key.pem', $public_key_pem);
file_put_contents('signature.dat', $signature);
//verify signature
$r = openssl_verify($data, $signature, $public_key_pem, "sha256WithRSAEncryption");
var_dump($r);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>openssl_verify</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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