(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.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <C_CkPdf.h>
#include <C_CkJsonObject.h>
#include <C_CkDtObj.h>

void ChilkatSample(void)
    {
    HCkPdf pdf;
    BOOL success;
    HCkJsonObject json;
    HCkDtObj responseDateTime;
    HCkDtObj thisUpdate;
    HCkDtObj nextUpdate;
    const char *serial;
    const char *validFrom;
    const char *validTo;
    BOOL expired;
    const char *subjectCN;
    const char *subjectO;
    const char *issuerCN;
    const char *issuerO;
    const char *keyType;
    const char *keySize;
    const char *der;
    const char *subjectOU;
    const char *subjectC;
    const char *issuerOU;
    const char *issuerC;
    int responseStatus;
    const char *responseTypeOid;
    const char *responseTypeName;
    const char *responseResponderIdChoice;
    const char *responseResponderKeyHash;
    int j;
    int count_j;
    const char *hashOid;
    const char *hashAlg;
    const char *issuerNameHash;
    const char *issuerKeyHash;
    const char *serialNumber;
    int status;
    int i;
    int count_i;

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

    pdf = CkPdf_Create();

    success = CkPdf_LoadFile(pdf,"qa_data/pdf/sign_testing_1/helloSigned2.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_putEmitCompact(json,FALSE);

    success = CkPdf_GetDss(pdf,json);
    printf("%s\n",CkJsonObject_emit(json));

    // 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 functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    responseDateTime = CkDtObj_Create();
    thisUpdate = CkDtObj_Create();
    nextUpdate = CkDtObj_Create();

    i = 0;
    count_i = CkJsonObject_SizeOfArray(json,"/Certs");
    while (i < count_i) {
        CkJsonObject_putI(json,i);
        serial = CkJsonObject_stringOf(json,"/Certs[i].serial");
        validFrom = CkJsonObject_stringOf(json,"/Certs[i].validFrom");
        validTo = CkJsonObject_stringOf(json,"/Certs[i].validTo");
        expired = CkJsonObject_BoolOf(json,"/Certs[i].expired");
        subjectCN = CkJsonObject_stringOf(json,"/Certs[i].subject.CN");
        subjectO = CkJsonObject_stringOf(json,"/Certs[i].subject.O");
        issuerCN = CkJsonObject_stringOf(json,"/Certs[i].issuer.CN");
        issuerO = CkJsonObject_stringOf(json,"/Certs[i].issuer.O");
        keyType = CkJsonObject_stringOf(json,"/Certs[i].keyType");
        keySize = CkJsonObject_stringOf(json,"/Certs[i].keySize");
        der = CkJsonObject_stringOf(json,"/Certs[i].der");
        subjectOU = CkJsonObject_stringOf(json,"/Certs[i].subject.OU");
        subjectC = CkJsonObject_stringOf(json,"/Certs[i].subject.C");
        issuerOU = CkJsonObject_stringOf(json,"/Certs[i].issuer.OU");
        issuerC = CkJsonObject_stringOf(json,"/Certs[i].issuer.C");
        i = i + 1;
    }

    i = 0;
    count_i = CkJsonObject_SizeOfArray(json,"/OCSPs");
    while (i < count_i) {
        CkJsonObject_putI(json,i);
        responseStatus = CkJsonObject_IntOf(json,"/OCSPs[i].responseStatus");
        responseTypeOid = CkJsonObject_stringOf(json,"/OCSPs[i].responseTypeOid");
        responseTypeName = CkJsonObject_stringOf(json,"/OCSPs[i].responseTypeName");
        responseResponderIdChoice = CkJsonObject_stringOf(json,"/OCSPs[i].response.responderIdChoice");
        responseResponderKeyHash = CkJsonObject_stringOf(json,"/OCSPs[i].response.responderKeyHash");
        CkJsonObject_DtOf(json,"/OCSPs[i].response.dateTime",FALSE,responseDateTime);
        j = 0;
        count_j = CkJsonObject_SizeOfArray(json,"/OCSPs[i].response.cert");
        while (j < count_j) {
            CkJsonObject_putJ(json,j);
            hashOid = CkJsonObject_stringOf(json,"/OCSPs[i].response.cert[j].hashOid");
            hashAlg = CkJsonObject_stringOf(json,"/OCSPs[i].response.cert[j].hashAlg");
            issuerNameHash = CkJsonObject_stringOf(json,"/OCSPs[i].response.cert[j].issuerNameHash");
            issuerKeyHash = CkJsonObject_stringOf(json,"/OCSPs[i].response.cert[j].issuerKeyHash");
            serialNumber = CkJsonObject_stringOf(json,"/OCSPs[i].response.cert[j].serialNumber");
            status = CkJsonObject_IntOf(json,"/OCSPs[i].response.cert[j].status");
            CkJsonObject_DtOf(json,"/OCSPs[i].response.cert[j].thisUpdate",FALSE,thisUpdate);
            CkJsonObject_DtOf(json,"/OCSPs[i].response.cert[j].nextUpdate",FALSE,nextUpdate);
            j = j + 1;
        }

        i = i + 1;
    }



    CkPdf_Dispose(pdf);
    CkJsonObject_Dispose(json);
    CkDtObj_Dispose(responseDateTime);
    CkDtObj_Dispose(thisUpdate);
    CkDtObj_Dispose(nextUpdate);

    }