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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- splitted from ./en/functions/openssl.xml, last change in rev 1.1 -->
<refentry id="function.openssl-verify">
<refnamediv>
<refname>openssl_verify</refname>
<refpurpose>Verify signature</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<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>
</methodsynopsis>
&warn.experimental.func;
<para>
Returns 1 if the signature is correct, 0 if it is incorrect, and
-1 on error.
</para>
<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>
<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>
<simpara>
See also <function>openssl_sign</function>.
</simpara>
</refsect1>
</refentry>
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vi: ts=1 sw=1
-->
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