(PHP Extension) Get PDF DSS (Document Security Store)

See more PDF Signatures Examples

This example demonstrates how to extract the information from a PDF's DSS (Document Security Store), if a /DSS exists. (Just because a PDF is signed does not mean a /DSS will exists. In fact, the /DSS is typically created at the point of adding the 2nd or greater signature because the /DSS contains LTV (long term validation) information about the previous signature at the time of adding an additional signature.)

Note: This example requires Chilkat v9.5.0.85 or greater.

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

$pdf = new CkPdf();

$success = $pdf->LoadFile('qa_data/pdf/sign_testing_1/helloSigned2.pdf');
if ($success == false) {
    print $pdf->lastErrorText() . "\n";
    exit;
}

$json = new CkJsonObject();
$json->put_EmitCompact(false);

$success = $pdf->GetDss($json);
print $json->emit() . "\n";

// The document security store contains certificates, OCSP responses, and CRLs.
// The following JSON is a sample of what the /DSS can contain.
// Unfortunately, our sample contains /Certs and /OCSPs, but no /CRLs.
// It's no problem because whatever JSON you get back, you can use the
// following online tool to generate code to parse.
// Generate Parsing Code from JSON

// The code generated by the online tool for this JSON is shown below..

// {
//   "/VRI": {
//     "/EC5BB34CC1F8A0C5FE674427E16E313A08C80808": {}
//   },
//   "/Certs": [
//     {
//       "serial": "02",
//       "validFrom": "2011-08-07T19:00:00-05:00",
//       "validTo": "2021-08-10T23:59:59-05:00",
//       "expired": false,
//       "subject": {
//         "CN": "XYZ Corporation",
//         "O": "XYZ"
//       },
//       "issuer": {
//         "CN": "XYZ Corporation",
//         "O": "XYZ"
//       },
//       "keyType": "RSA",
//       "keySize": "2048",
//       "der": "MIIDz...Q4Zt"
//     },
//     {
//       "serial": "01",
//       "validFrom": "2011-08-07T19:00:00-05:00",
//       "validTo": "2021-08-10T23:59:59-05:00",
//       "expired": false,
//       "subject": {
//         "CN": "XYZ Corporation",
//         "O": "XYZ"
//       },
//       "issuer": {
//         "CN": "XYZ Corporation",
//         "O": "XYZ"
//       },
//       "keyType": "RSA",
//       "keySize": "2048",
//       "der": "MIID...jXYFc="
//     },
//     {
//       "serial": "0AA125D6D6321B7E41E405DA3697C215",
//       "validFrom": "2016-01-07T06:00:00-06:00",
//       "validTo": "2031-01-07T12:00:00-06:00",
//       "expired": false,
//       "subject": {
//         "CN": "DigiCert SHA2 Assured ID Timestamping CA",
//         "OU": "www.digicert.com",
//         "O": "DigiCert Inc",
//         "C": "US"
//       },
//       "issuer": {
//         "CN": "DigiCert Assured ID Root CA",
//         "OU": "www.digicert.com",
//         "O": "DigiCert Inc",
//         "C": "US"
//       },
//       "keyType": "RSA",
//       "keySize": "2048",
//       "der": "MIIF...OUg=="
//     },
//     {
//       "serial": "04CD3F8568AE76C61BB0FE7160CCA76D",
//       "validFrom": "2019-09-30T19:00:00-05:00",
//       "validTo": "2030-10-17T00:00:00-05:00",
//       "expired": false,
//       "subject": {
//         "CN": "TIMESTAMP-SHA256-2019-10-15",
//         "O": "DigiCert, Inc.",
//         "C": "US"
//       },
//       "issuer": {
//         "CN": "DigiCert SHA2 Assured ID Timestamping CA",
//         "OU": "www.digicert.com",
//         "O": "DigiCert Inc",
//         "C": "US"
//       },
//       "keyType": "RSA",
//       "keySize": "2048",
//       "der": "MIIG...MJtPc="
//     },
//     {
//       "serial": "0CE7E0E517D846FE8FE560FC1BF03039",
//       "validFrom": "2006-11-09T18:00:00-06:00",
//       "validTo": "2031-11-10T00:00:00-06:00",
//       "expired": false,
//       "subject": {
//         "CN": "DigiCert Assured ID Root CA",
//         "OU": "www.digicert.com",
//         "O": "DigiCert Inc",
//         "C": "US"
//       },
//       "issuer": {
//         "CN": "DigiCert Assured ID Root CA",
//         "OU": "www.digicert.com",
//         "O": "DigiCert Inc",
//         "C": "US"
//       },
//       "keyType": "RSA",
//       "keySize": "2048",
//       "der": "MIIDt...FL6Lw8g=="
//     },
//     {
//       "serial": "E4D34D01798BE686424AF7F6F0C3BF41",
//       "validFrom": "2015-03-24T10:58:16-05:00",
//       "validTo": "2039-12-31T23:59:59-06:00",
//       "expired": false,
//       "subject": {
//         "CN": "www.xyz.com"
//       },
//       "issuer": {
//         "CN": "www.xyz.com"
//       },
//       "keyType": "RSA",
//       "keySize": "1024",
//       "der": "MIIB9DCCAWG...UR10lz"
//     }
//   ],
//   "/OCSPs": [
//     {
//       "responseStatus": 0,
//       "responseTypeOid": "1.3.6.1.5.5.7.48.1.1",
//       "responseTypeName": "ocspBasic",
//       "response": {
//         "responderIdChoice": "KeyHash",
//         "responderKeyHash": "Reuir/SSy4IxLVGLp6chnfNtyA8=",
//         "dateTime": "20201005173921Z",
//         "cert": [
//           {
//             "hashOid": "1.3.14.3.2.26",
//             "hashAlg": "SHA-1",
//             "issuerNameHash": "98S+C0C1w0QzPT+uuU1uONr67FE=",
//             "issuerKeyHash": "Reuir/SSy4IxLVGLp6chnfNtyA8=",
//             "serialNumber": "0AA125D6D6321B7E41E405DA3697C215",
//             "status": 0,
//             "thisUpdate": "20201005173921Z",
//             "nextUpdate": "20201012173921Z"
//           }
//         ]
//       }
//     },
//     {
//       "responseStatus": 0,
//       "responseTypeOid": "1.3.6.1.5.5.7.48.1.1",
//       "responseTypeName": "ocspBasic",
//       "response": {
//         "responderIdChoice": "KeyHash",
//         "responderKeyHash": "9LbhIB3+Ka7S5GGlsqIlssgXNW4=",
//         "dateTime": "20201006114501Z",
//         "cert": [
//           {
//             "hashOid": "1.3.14.3.2.26",
//             "hashAlg": "SHA-1",
//             "issuerNameHash": "+YYA+KSr7NIxRSxCjUNQo25SyD0=",
//             "issuerKeyHash": "9LbhIB3+Ka7S5GGlsqIlssgXNW4=",
//             "serialNumber": "04CD3F8568AE76C61BB0FE7160CCA76D",
//             "status": 0,
//             "thisUpdate": "20201006114501Z",
//             "nextUpdate": "20201013110001Z"
//           }
//         ]
//       }
//     }
//   ]
// }

$responseDateTime = new CkDtObj();
$thisUpdate = new CkDtObj();
$nextUpdate = new CkDtObj();

$i = 0;
$count_i = $json->SizeOfArray('/Certs');
while ($i < $count_i) {
    $json->put_I($i);
    $serial = $json->stringOf('/Certs[i].serial');
    $validFrom = $json->stringOf('/Certs[i].validFrom');
    $validTo = $json->stringOf('/Certs[i].validTo');
    $expired = $json->BoolOf('/Certs[i].expired');
    $subjectCN = $json->stringOf('/Certs[i].subject.CN');
    $subjectO = $json->stringOf('/Certs[i].subject.O');
    $issuerCN = $json->stringOf('/Certs[i].issuer.CN');
    $issuerO = $json->stringOf('/Certs[i].issuer.O');
    $keyType = $json->stringOf('/Certs[i].keyType');
    $keySize = $json->stringOf('/Certs[i].keySize');
    $der = $json->stringOf('/Certs[i].der');
    $subjectOU = $json->stringOf('/Certs[i].subject.OU');
    $subjectC = $json->stringOf('/Certs[i].subject.C');
    $issuerOU = $json->stringOf('/Certs[i].issuer.OU');
    $issuerC = $json->stringOf('/Certs[i].issuer.C');
    $i = $i + 1;
}

$i = 0;
$count_i = $json->SizeOfArray('/OCSPs');
while ($i < $count_i) {
    $json->put_I($i);
    $responseStatus = $json->IntOf('/OCSPs[i].responseStatus');
    $responseTypeOid = $json->stringOf('/OCSPs[i].responseTypeOid');
    $responseTypeName = $json->stringOf('/OCSPs[i].responseTypeName');
    $responseResponderIdChoice = $json->stringOf('/OCSPs[i].response.responderIdChoice');
    $responseResponderKeyHash = $json->stringOf('/OCSPs[i].response.responderKeyHash');
    $json->DtOf('/OCSPs[i].response.dateTime',false,$responseDateTime);
    $j = 0;
    $count_j = $json->SizeOfArray('/OCSPs[i].response.cert');
    while ($j < $count_j) {
        $json->put_J($j);
        $hashOid = $json->stringOf('/OCSPs[i].response.cert[j].hashOid');
        $hashAlg = $json->stringOf('/OCSPs[i].response.cert[j].hashAlg');
        $issuerNameHash = $json->stringOf('/OCSPs[i].response.cert[j].issuerNameHash');
        $issuerKeyHash = $json->stringOf('/OCSPs[i].response.cert[j].issuerKeyHash');
        $serialNumber = $json->stringOf('/OCSPs[i].response.cert[j].serialNumber');
        $status = $json->IntOf('/OCSPs[i].response.cert[j].status');
        $json->DtOf('/OCSPs[i].response.cert[j].thisUpdate',false,$thisUpdate);
        $json->DtOf('/OCSPs[i].response.cert[j].nextUpdate',false,$nextUpdate);
        $j = $j + 1;
    }

    $i = $i + 1;
}


?>