PHP

Combine Timestamp Reply and Content File into a TimeStampData

See more ASN.1 Examples

Demonstrates how to combine a timestamp reply (RFC 3161) with a data file (any type of file) to create a TimeStampData structure (RFC 5544). Chilkat2 PHP

<?php

use Chilkat2\Asn;
use Chilkat2\BinData;
use Chilkat2\Xml;

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

// Also see this example:
// Send a TimeStamp Request to a TimeStamp Authority and get the Response

// Load a timestamp reply file
$bdTsr = new BinData();
try {
    $bdTsr->LoadFile('qa_data/tsd/sample.tsr');
} catch (\Chilkat2\Exception $e) {
    echo "Failed to load timestamp reply file.\n";
    exit;
}

// Load the tsr into an ASN.1 object.
$asnTsr = new Asn();
try {
    $asnTsr->LoadEncoded($bdTsr->GetEncoded('base64'), 'base64');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the timestamp reply as XML.
$xmlTsr = new Xml();
$xmlTsr->LoadXml($asnTsr->AsnToXml());

// The timestamp reply XML begins like this:
// We'll want to remove the 1st "sequence" subtree.

/*
 *     <?xml version="1.0" encoding="utf-8"?>
 *     <sequence>
 *         <sequence>       <---- Remove this sub-tree.
 *             <int>00</int>
 *             <sequence>
 *                 <utf8>Operation Okay</utf8>
 *             </sequence>
 *         </sequence>
 *         <sequence>
 *             <oid>1.2.840.113549.1.7.2</oid>
 *             <contextSpecific tag="0" constructed="1">
 *             ...
 */

// Remove the 1st sub-tree..
$xmlTsr->RemoveChildByIndex(0);

// In this example, the data file we're combining with the timestamp into a timestampData is a .p7m.
// However, it can be any type of file (text or binary), it doesn't matter..
$bdContent = new BinData();
try {
    $bdContent->LoadFile('qa_data/tsd/sample.p7m');
} catch (\Chilkat2\Exception $e) {
    echo "Failed to load content file.\n";
    exit;
}

// Begin building the TimeStampData.
// We'll build as XML and then convert to ASN.1
$xml = new Xml();
$xml->Tag = 'sequence';
$xml->UpdateChildContent('oid', '1.2.840.113549.1.9.16.1.31');
$xml->UpdateAttrAt('contextSpecific', true, 'tag', '0');
$xml->UpdateAttrAt('contextSpecific', true, 'constructed', '1');
$xml->UpdateChildContent('contextSpecific|sequence|int', '01');
$xml->UpdateChildContent('contextSpecific|sequence|octets', $bdContent->GetEncoded('base64'));
$xml->UpdateAttrAt('contextSpecific|sequence|contextSpecific', true, 'tag', '0');
$xml->UpdateAttrAt('contextSpecific|sequence|contextSpecific', true, 'constructed', '1');

$xContext = $xml->GetChildWithTag('contextSpecific|sequence|contextSpecific');
$xContext->AddChildTree($xmlTsr);

// Convert the XML to ASN.1
$tsd = new Asn();
$tsd->LoadAsnXml($xml->GetXml());

// Write the timestamped data to a file.
$tsd->WriteBinaryDer('qa_output/sample.tsd');

// Alternatively, get the tsd ASN.1 as base64..
$tsdBase64 = $tsd->GetEncodedDer('base64_mime');
echo $tsdBase64, "\n";