(.NET Core C#) 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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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Pdf pdf = new Chilkat.Pdf();

bool success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.EmitCompact = false;

success = pdf.GetDss(json);
Debug.WriteLine(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"
//           }
//         ]
//       }
//     }
//   ]
// }

Chilkat.DtObj responseDateTime = new Chilkat.DtObj();
Chilkat.DtObj thisUpdate = new Chilkat.DtObj();
Chilkat.DtObj nextUpdate = new Chilkat.DtObj();
string serial;
string validFrom;
string validTo;
bool 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.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.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.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;
}