(PHP Extension) Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML.

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");

$asn = new CkAsn();

//  Begin with loading ASN.1 from a binary DER/BER format file.
$success = $asn->LoadBinaryFile('/Users/chilkat/testData/p7b/test.p7b');
if ($success != true) {
    print $asn->lastErrorText() . "\n";
    exit;
}

//  Convert ASN.1 to XML:
$strXml = $asn->asnToXml();
if ($asn->get_LastMethodSuccess() != true) {
    print $asn->lastErrorText() . "\n";
    exit;
}

//  The XML returned by AsnToXml will be compact and not pretty-formatted.
//  Use Chilkat XML to format the XML better:
$xml = new CkXml();
$success = $xml->LoadXml($strXml);
//  Assuming success for this example..
//  This is formatted better for human viewing:
print $xml->getXml() . "\n";

//  Now get the ASN.1 in base64 format.  Any encoding supported
//  by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
$strBase64 = $asn->getEncodedDer('base64');

//  Load the ASN.1 from XML:
$asn2 = new CkAsn();
$success = $asn2->LoadAsnXml($xml->getXml());
if ($success != true) {
    print $asn2->lastErrorText() . "\n";
    exit;
}

//  Load the ASN.1 from an encoded string, such as base64:
$asn3 = new CkAsn();
$success = $asn3->LoadEncoded($strBase64,'base64');
if ($success != true) {
    print $asn3->lastErrorText() . "\n";
    exit;
}


?>