(Android™) 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.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

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

    CkPdf pdf = new CkPdf();

    boolean success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf");
    if (success == false) {
        Log.i(TAG, pdf.lastErrorText());
        return;
        }

    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);

    success = pdf.GetDss(json);
    Log.i(TAG, json.emit());

    // 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"
    //           }
    //         ]
    //       }
    //     }
    //   ]
    // }

    CkDtObj responseDateTime = new CkDtObj();
    CkDtObj thisUpdate = new CkDtObj();
    CkDtObj nextUpdate = new CkDtObj();
    String serial;
    String validFrom;
    String validTo;
    boolean expired;
    String subjectCN;
    String subjectO;
    String issuerCN;
    String issuerO;
    String keyType;
    String keySize;
    String der;
    String subjectOU;
    String subjectC;
    String issuerOU;
    String issuerC;
    int responseStatus;
    String responseTypeOid;
    String responseTypeName;
    String responseResponderIdChoice;
    String responseResponderKeyHash;
    int j;
    int count_j;
    String hashOid;
    String hashAlg;
    String issuerNameHash;
    String issuerKeyHash;
    String serialNumber;
    int status;

    int i = 0;
    int 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;
        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}