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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.10 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.openssl-verify">
<refnamediv>
<refname>openssl_verify</refname>
<refpurpose>Verify signature</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>openssl_verify</methodname>
<methodparam><type>string</type><parameter>data</parameter></methodparam>
<methodparam><type>string</type><parameter>signature</parameter></methodparam>
<methodparam><type>mixed</type><parameter>pub_key_id</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>signature_alg</parameter></methodparam>
</methodsynopsis>
<para>
<function>openssl_verify</function> verifies that the
<parameter>signature</parameter> is correct for the specified
<parameter>data</parameter> using the public key associated with
<parameter>pub_key_id</parameter>. This must be the public key
corresponding to the private key used for signing.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>signature</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pub_key_id</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>signature_alg</parameter></term>
<listitem>
<para>
Defaults to <constant>OPENSSL_ALGO_SHA1</constant>. For more
information see the list of <link
linkend="openssl.signature-algos">Signature Algorithms</link>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns 1 if the signature is correct, 0 if it is incorrect, and
-1 on error.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.0.0</entry>
<entry>
The <parameter>signature_alg</parameter> parameter was added.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>openssl_verify</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// $data and $signature are assumed to contain the data and the signature
// fetch public key from certificate and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pubkeyid = openssl_get_publickey($cert);
// state whether signature is okay or not
$ok = openssl_verify($data, $signature, $pubkeyid);
if ($ok == 1) {
echo "good";
} elseif ($ok == 0) {
echo "bad";
} else {
echo "ugly, error checking signature";
}
// free the key from memory
openssl_free_key($pubkeyid);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>openssl_sign</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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