PHP ActiveX Requires Chilkat v11.0.0+

Extract TSTInfo from RFC3161 Timestamp Reply

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Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and converts the timestamp reply to XML, and then extracts the TSTInfo from the XML and converts it to XML. PHP ActiveX

<?php

$success = 0;

//  Note: Requires Chilkat v9.5.0.75 or greater.

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

//  First sha-256 hash the data that is to be timestamped.
//  In this example, the data is the string "Hello World"

$crypt = new COM("Chilkat.Crypt2");
$crypt->HashAlgorithm = 'sha256';
$crypt->EncodingMode = 'base64';
$base64Hash = $crypt->hashFileENC('qa_data/hamlet.xml');

$http = new COM("Chilkat.Http");

$requestToken = new COM("Chilkat.BinData");
$optionalPolicyOid = '';
$addNonce = 0;
$requestTsaCert = 1;

//  Create a time-stamp request token
$success = $http->CreateTimestampRequest('sha256',$base64Hash,$optionalPolicyOid,$addNonce,$requestTsaCert,$requestToken);
if ($success == 0) {
    print $http->LastErrorText . "\n";
    exit;
}

//  Send the time-stamp request token to the TSA.
//  This is the equivalent of the following CURL command:
//  curl -H "Content-Type: application/timestamp-query" --data-binary '@file.tsq' http://timestamp.digicert.com > file.tsr
$tsaUrl = 'http://timestamp.digicert.com';
$resp = new COM("Chilkat.HttpResponse");
$success = $http->HttpBd('POST',$tsaUrl,$requestToken,'application/timestamp-query',$resp);
if ($success == 0) {
    print $http->LastErrorText . "\n";
    exit;
}

//  Get the timestamp reply from the HTTP response object.
$timestampReply = new COM("Chilkat.BinData");
$resp->GetBodyBd($timestampReply);

//  Convert the binary timestamp reply to XML
$asn = new COM("Chilkat.Asn");
$success = $asn->LoadBd($timestampReply);
if ($success == 0) {
    print $asn->LastErrorText . "\n";
    exit;
}

$xml = new COM("Chilkat.Xml");
$success = $xml->LoadXml($asn->asnToXml());

//  Extract the TSTInfo from the XML.
//  The TSTInfo is this base64 encoded ASN.1 

//  TSTInfo ::= SEQUENCE  {
//     version                      INTEGER  { v1(1) },
//     policy                       TSAPolicyId,
//     messageImprint               MessageImprint,
//       -- MUST have the same value as the similar field in
//       -- TimeStampReq
//     serialNumber                 INTEGER,
//      -- Time-Stamping users MUST be ready to accommodate integers
//      -- up to 160 bits.
//     genTime                      GeneralizedTime,
//     accuracy                     Accuracy                 OPTIONAL,
//     ordering                     BOOLEAN             DEFAULT FALSE,
//     nonce                        INTEGER                  OPTIONAL,
//       -- MUST be present if the similar field was present
//       -- in TimeStampReq.  In that case it MUST have the same value.
//     tsa                          [0] GeneralName          OPTIONAL,
//     extensions                   [1] IMPLICIT Extensions   OPTIONAL  }

$tstInfoBase64 = $xml->getChildContent('sequence[1]|contextSpecific|sequence|sequence|contextSpecific|octets');

$bdTstInfo = new COM("Chilkat.BinData");
$bdTstInfo->AppendEncoded($tstInfoBase64,'base64');

$asnTstInfo = new COM("Chilkat.Asn");
$success = $asnTstInfo->LoadBd($bdTstInfo);
if ($success == 0) {
    print $asnTstInfo->LastErrorText . "\n";
    exit;
}

$xmlTstInfo = new COM("Chilkat.Xml");
$success = $xmlTstInfo->LoadXml($asnTstInfo->asnToXml());
print $xmlTstInfo->getXml() . "\n";

//  Here's the TSTInfo XML:

//  <?xml version="1.0" encoding="utf-8"?>
//  <sequence>
//      <int>01</int>
//      <oid>2.16.840.1.114412.7.1</oid>
//      <sequence>
//          <sequence>
//              <oid>2.16.840.1.101.3.4.2.1</oid>
//              <null/>
//          </sequence>
//          <octets>4sRRyWOzC7EOic4fQ9+Op1pa10DbgoBGjBvkq09LZmE=</octets>
//      </sequence>
//      <int>00AD2C86E49872597B60F87D5C54BCFFAE</int>
//      <universal tag="24" constructed="0">MjAyMzAzMTYxMTQ5NTJa</universal>
//  </sequence>

//     The genTime (GeneralizedTime) is contained in the final "universal" XML element and is 
//     in base64. It is the time at which the time-stamp token has been created by
//     the TSA. After decoding from base64, it is:
//  
//     The syntax is: YYYYMMDDhhmmss[.s...]Z
//     Example: 19990609001326.34352Z

$sbGenTime = new COM("Chilkat.StringBuilder");
$sbGenTime->DecodeAndAppend($xmlTstInfo->getChildContent('universal'),'base64','utf-8');
print $sbGenTime->getAsString() . "\n";

//  Result:
//  20230316115718Z

?>