(Delphi ActiveX) 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 for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pdf: TChilkatPdf;
success: Integer;
json: TChilkatJsonObject;
responseDateTime: TDtObj;
thisUpdate: TDtObj;
nextUpdate: TDtObj;
serial: WideString;
validFrom: WideString;
validTo: WideString;
expired: Integer;
subjectCN: WideString;
subjectO: WideString;
issuerCN: WideString;
issuerO: WideString;
keyType: WideString;
keySize: WideString;
der: WideString;
subjectOU: WideString;
subjectC: WideString;
issuerOU: WideString;
issuerC: WideString;
responseStatus: Integer;
responseTypeOid: WideString;
responseTypeName: WideString;
responseResponderIdChoice: WideString;
responseResponderKeyHash: WideString;
j: Integer;
count_j: Integer;
hashOid: WideString;
hashAlg: WideString;
issuerNameHash: WideString;
issuerKeyHash: WideString;
serialNumber: WideString;
status: Integer;
i: Integer;
count_i: Integer;

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

pdf := TChilkatPdf.Create(Self);

success := pdf.LoadFile('qa_data/pdf/sign_testing_1/helloSigned2.pdf');
if (success = 0) then
  begin
    Memo1.Lines.Add(pdf.LastErrorText);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
json.EmitCompact := 0;

success := pdf.GetDss(json.ControlInterface);
Memo1.Lines.Add(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"
//           }
//         ]
//       }
//     }
//   ]
// }

responseDateTime := TDtObj.Create(Self);
thisUpdate := TDtObj.Create(Self);
nextUpdate := TDtObj.Create(Self);

i := 0;
count_i := json.SizeOfArray('/Certs');
while i < count_i do
  begin
    json.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;
  end;

i := 0;
count_i := json.SizeOfArray('/OCSPs');
while i < count_i do
  begin
    json.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',0,responseDateTime.ControlInterface);
    j := 0;
    count_j := json.SizeOfArray('/OCSPs[i].response.cert');
    while j < count_j do
      begin
        json.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',0,thisUpdate.ControlInterface);
        json.DtOf('/OCSPs[i].response.cert[j].nextUpdate',0,nextUpdate.ControlInterface);
        j := j + 1;
      end;

    i := i + 1;
  end;
end;