(Lianja) 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.

loPdf = createobject("CkPdf")

llSuccess = loPdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf")
if (llSuccess = .F.) then
    ? loPdf.LastErrorText
    release loPdf
    return
endif

loJson = createobject("CkJsonObject")
loJson.EmitCompact = .F.

llSuccess = loPdf.GetDss(loJson)
? loJson.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"
//           }
//         ]
//       }
//     }
//   ]
// }

loResponseDateTime = createobject("CkDtObj")
loThisUpdate = createobject("CkDtObj")
loNextUpdate = createobject("CkDtObj")

i = 0
lnCount_i = loJson.SizeOfArray("/Certs")
do while i < lnCount_i
    loJson.I = i
    lcSerial = loJson.StringOf("/Certs[i].serial")
    lcValidFrom = loJson.StringOf("/Certs[i].validFrom")
    lcValidTo = loJson.StringOf("/Certs[i].validTo")
    llExpired = loJson.BoolOf("/Certs[i].expired")
    lcSubjectCN = loJson.StringOf("/Certs[i].subject.CN")
    lcSubjectO = loJson.StringOf("/Certs[i].subject.O")
    lcIssuerCN = loJson.StringOf("/Certs[i].issuer.CN")
    lcIssuerO = loJson.StringOf("/Certs[i].issuer.O")
    lcKeyType = loJson.StringOf("/Certs[i].keyType")
    lcKeySize = loJson.StringOf("/Certs[i].keySize")
    lcDer = loJson.StringOf("/Certs[i].der")
    lcSubjectOU = loJson.StringOf("/Certs[i].subject.OU")
    lcSubjectC = loJson.StringOf("/Certs[i].subject.C")
    lcIssuerOU = loJson.StringOf("/Certs[i].issuer.OU")
    lcIssuerC = loJson.StringOf("/Certs[i].issuer.C")
    i = i + 1
enddo
i = 0
lnCount_i = loJson.SizeOfArray("/OCSPs")
do while i < lnCount_i
    loJson.I = i
    lnResponseStatus = loJson.IntOf("/OCSPs[i].responseStatus")
    lcResponseTypeOid = loJson.StringOf("/OCSPs[i].responseTypeOid")
    lcResponseTypeName = loJson.StringOf("/OCSPs[i].responseTypeName")
    lcResponseResponderIdChoice = loJson.StringOf("/OCSPs[i].response.responderIdChoice")
    lcResponseResponderKeyHash = loJson.StringOf("/OCSPs[i].response.responderKeyHash")
    loJson.DtOf("/OCSPs[i].response.dateTime",.F.,loResponseDateTime)
    j = 0
    lnCount_j = loJson.SizeOfArray("/OCSPs[i].response.cert")
    do while j < lnCount_j
        loJson.J = j
        lcHashOid = loJson.StringOf("/OCSPs[i].response.cert[j].hashOid")
        lcHashAlg = loJson.StringOf("/OCSPs[i].response.cert[j].hashAlg")
        lcIssuerNameHash = loJson.StringOf("/OCSPs[i].response.cert[j].issuerNameHash")
        lcIssuerKeyHash = loJson.StringOf("/OCSPs[i].response.cert[j].issuerKeyHash")
        lcSerialNumber = loJson.StringOf("/OCSPs[i].response.cert[j].serialNumber")
        lnStatus = loJson.IntOf("/OCSPs[i].response.cert[j].status")
        loJson.DtOf("/OCSPs[i].response.cert[j].thisUpdate",.F.,loThisUpdate)
        loJson.DtOf("/OCSPs[i].response.cert[j].nextUpdate",.F.,loNextUpdate)
        j = j + 1
    enddo
    i = i + 1
enddo


release loPdf
release loJson
release loResponseDateTime
release loThisUpdate
release loNextUpdate