(Objective-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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#import <CkoPdf.h>
#import <CkoJsonObject.h>
#import <CkoDtObj.h>
#import <NSString.h>

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

CkoPdf *pdf = [[CkoPdf alloc] init];

BOOL success = [pdf LoadFile: @"qa_data/pdf/sign_testing_1/helloSigned2.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;

success = [pdf GetDss: json];
NSLog(@"%@",[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"
//           }
//         ]
//       }
//     }
//   ]
// }

CkoDtObj *responseDateTime = [[CkoDtObj alloc] init];
CkoDtObj *thisUpdate = [[CkoDtObj alloc] init];
CkoDtObj *nextUpdate = [[CkoDtObj alloc] init];
NSString *serial = 0;
NSString *validFrom = 0;
NSString *validTo = 0;
BOOL expired;
NSString *subjectCN = 0;
NSString *subjectO = 0;
NSString *issuerCN = 0;
NSString *issuerO = 0;
NSString *keyType = 0;
NSString *keySize = 0;
NSString *der = 0;
NSString *subjectOU = 0;
NSString *subjectC = 0;
NSString *issuerOU = 0;
NSString *issuerC = 0;
int responseStatus;
NSString *responseTypeOid = 0;
NSString *responseTypeName = 0;
NSString *responseResponderIdChoice = 0;
NSString *responseResponderKeyHash = 0;
int j;
int count_j;
NSString *hashOid = 0;
NSString *hashAlg = 0;
NSString *issuerNameHash = 0;
NSString *issuerKeyHash = 0;
NSString *serialNumber = 0;
int status;

int i = 0;
int count_i = [[json SizeOfArray: @"/Certs"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: 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"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    responseStatus = [[json IntOf: @"/OCSPs[i].responseStatus"] intValue];
    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" bLocal: NO dt: responseDateTime];
    j = 0;
    count_j = [[json SizeOfArray: @"/OCSPs[i].response.cert"] intValue];
    while (j < count_j) {
        json.J = [NSNumber numberWithInt: 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"] intValue];
        [json DtOf: @"/OCSPs[i].response.cert[j].thisUpdate" bLocal: NO dt: thisUpdate];
        [json DtOf: @"/OCSPs[i].response.cert[j].nextUpdate" bLocal: NO dt: nextUpdate];
        j = j + 1;
    }

    i = i + 1;
}