(PHP Extension) Generate a CSR containing an Extension Request

See more CSR Examples

Demonstrates how to generate a CSR containing a 1.2.840.113549.1.9.14 extensionRequest.

Note: This example requires Chilkat v9.5.0.91 or greater.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example will generate a secp256r1 ECDSA key for the CSR.
$ecc = new CkEcc();
$prng = new CkPrng();

// privKey is a CkPrivateKey
$privKey = $ecc->GenEccKey('secp256r1',$prng);
if ($ecc->get_LastMethodSuccess() == false) {
    print 'Failed to generate a new ECDSA private key.' . "\n";
    exit;
}

$csr = new CkCsr();

// Add common CSR fields:
$csr->put_CommonName('mysubdomain.mydomain.com');
$csr->put_Country('GB');
$csr->put_State('Yorks');
$csr->put_Locality('York');
$csr->put_Company('Internet Widgits Pty Ltd');
$csr->put_EmailAddress('support@mydomain.com');

// Add the following 1.2.840.113549.1.9.14 extensionRequest
// Note: The easiest way to know the content and format of the XML to be added is to examine
// a pre-existing CSR with the same desired extensionRequest.  You can use Chilkat to
// get the extensionRequest from an existing CSR. 

// 
// Here is a sample extension request:

// <?xml version="1.0" encoding="utf-8"?>
// <set>
//    <sequence>
//        <sequence>
//            <oid>1.3.6.1.4.1.311.20.2</oid>
//            <asnOctets>
//                <printable>ZATCA-Code-Signing</printable>
//            </asnOctets>
//        </sequence>
//        <sequence>
//            <oid>2.5.29.17</oid>
//            <asnOctets>
//                <sequence>
//                    <contextSpecific tag="4" constructed="1">
//                        <sequence>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.4</oid>
//                                    <utf8>334623324234325</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>0.9.2342.19200300.100.1.1</oid>
//                                    <utf8>310122393500003</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.12</oid>
//                                    <utf8>0000</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.26</oid>
//                                    <utf8>Sample E</utf8>
//                                </sequence>
//                            </set>
//                            <set>
//                                <sequence>
//                                    <oid>2.5.4.15</oid>
//                                    <utf8>Sample Business</utf8>
//                                </sequence>
//                            </set>
//                        </sequence>
//                    </contextSpecific>
//                </sequence>
//            </asnOctets>
//        </sequence>
//    </sequence>
// </set>

// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

// Here's the code to generate the above extension request.

$xml = new CkXml();
$xml->put_Tag('set');
$xml->UpdateChildContent('sequence|sequence|oid','1.3.6.1.4.1.311.20.2');
$xml->UpdateChildContent('sequence|sequence|asnOctets|printable','ZATCA-Code-Signing');
$xml->UpdateChildContent('sequence|sequence[1]|oid','2.5.29.17');
$xml->UpdateAttrAt('sequence|sequence[1]|asnOctets|sequence|contextSpecific',true,'tag','4');
$xml->UpdateAttrAt('sequence|sequence[1]|asnOctets|sequence|contextSpecific',true,'constructed','1');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|oid','2.5.4.4');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set|sequence|utf8','334623324234325');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|oid','0.9.2342.19200300.100.1.1');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[1]|sequence|utf8','310122393500003');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|oid','2.5.4.12');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[2]|sequence|utf8','0000');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|oid','2.5.4.26');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[3]|sequence|utf8','Sample E');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|oid','2.5.4.15');
$xml->UpdateChildContent('sequence|sequence[1]|asnOctets|sequence|contextSpecific|sequence|set[4]|sequence|utf8','Sample Business');

// Add the extension request to the CSR
$csr->SetExtensionRequest($xml);

// Generate the CSR with the extension request
$csrPem = $csr->genCsrPem($privKey);
if ($csr->get_LastMethodSuccess() == false) {
    print $csr->lastErrorText() . "\n";

    exit;
}

print $csrPem . "\n";

// Sample PEM output:

// -----BEGIN CERTIFICATE REQUEST-----
// MIICEjCCAbkCAQAwgZcxITAfBgNVBAMMGG15c3ViZG9tYWluLm15ZG9tYWluLmNv
// bTELMAkGA1UEBhMCR0IxDjAMBgNVBAgMBVlvcmtzMQ0wCwYDVQQHDARZb3JrMSEw
// HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxIzAhBgkqhkiG9w0BCQEW
// FHN1cHBvcnRAbXlkb21haW4uY29tMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE
// g8EVNSV0ttlM9kG2E+J3ZB9WEDYVf2QA/8idrPRUafia1CHjd1kslwZA8eP2bAcf
// 2O493QAENqtW6DTHJbRz8KCBvjCBuwYJKoZIhvcNAQkOMYGtMIGqMCEGCSsGAQQB
// gjcUAgQUExJaQVRDQS1Db2RlLVNpZ25pbmcwgYQGA1UdEQR9MHukeTB3MRgwFgYD
// VQQEDA8zMzQ2MjMzMjQyMzQzMjUxHzAdBgoJkiaJk/IsZAEBDA8zMTAxMjIzOTM1
// MDAwMDMxDTALBgNVBAwMBDAwMDAxETAPBgNVBBoMCFNhbXBsZSBFMRgwFgYDVQQP
// DA9TYW1wbGUgQnVzaW5lc3MwCgYIKoZIzj0EAwIDRwAwRAIgF7D30eSBklfo+oel
// 1B0z64eJDB9MB3rCoiFZlj+mz0YCIHYI87eyqdtw2LOcAoBRhyxlBT6i28+Z/8t9
// bYsMIYvp
// -----END CERTIFICATE REQUEST-----

?>