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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.openssl-csr-get-public-key" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>openssl_csr_get_public_key</refname>
<refpurpose>Returns the public key of a <acronym>CSR</acronym></refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>OpenSSLAsymmetricKey</type><type>false</type></type><methodname>openssl_csr_get_public_key</methodname>
<methodparam><type class="union"><type>OpenSSLCertificateSigningRequest</type><type>string</type></type><parameter>csr</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>short_names</parameter><initializer>&true;</initializer></methodparam>
</methodsynopsis>
<para>
<function>openssl_csr_get_public_key</function> extracts the public key
from <parameter>csr</parameter> and prepares it for use by other functions.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&openssl.param.csr;
<varlistentry>
<term><parameter>short_names</parameter></term>
<listitem>
<warning>
<para>
This parameter is ignored
</para>
</warning>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an <classname>OpenSSLAsymmetricKey</classname> on success, or &false; on error.
</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>
On success, this function returns an <classname>OpenSSLAsymmetricKey</classname> instance now;
previously, a &resource; of type <literal>OpenSSL key</literal> was returned.
</entry>
</row>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>csr</parameter> accepts an <classname>OpenSSLCertificateSigningRequest</classname> instance now;
previously, a &resource; of type <literal>OpenSSL X.509 CSR</literal> was accepted.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>openssl_csr_get_public_key() example</title>
<programlisting role="php">
<![CDATA[
<?php
$subject = array(
"commonName" => "example.com",
);
$private_key = openssl_pkey_new(array(
"private_key_bits" => 2048,
"private_key_type" => OPENSSL_KEYTYPE_RSA,
));
$csr = openssl_csr_new($subject, $private_key, array('digest_alg' => 'sha256') );
$public_key = openssl_csr_get_public_key($csr);
$info = openssl_pkey_get_details($public_key);
echo $info['key'];
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>openssl_csr_get_subject</function></member>
<member><function>openssl_csr_new</function></member>
<member><function>openssl_pkey_get_details</function></member>
<member><function>openssl_pkey_export_to_file</function></member>
<member><function>openssl_pkey_export</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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