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Objective-C Examples

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(Objective-C) Validate CAdES-T Signature (.p7m)

Validates a CAdES-T CMS signature and extracts the time-stamp token and gets information about it. Also validates the time-stamp token.

Note: This example requires Chilkat v9.5.0.78 or greater.

Chilkat Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

#import <CkoCrypt2.h>
#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoDtObj.h>

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

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
BOOL success;

// Indicate that the CAdES-T timestamp tokens must also pass validation for the signature to be validated.
CkoJsonObject *cmsOptions = [[CkoJsonObject alloc] init];
[cmsOptions UpdateBool: @"ValidateTimestampTokens" value: YES];
crypt.CmsOptions = [cmsOptions Emit];

// Validate the .p7m and extract the original signed data to an output file.
// Note: The timestampToken is an unauthenticated attribute.  See the code below that parses the LastJsonData
// for details about examining timestampToken.
success = [crypt VerifyP7M: @"qa_data/cades/CAdES-T/Signature-C-T-1.p7m" destPath: @"qa_output/out.dat"];

// Get information about the CMS signature in the LastJsonData.
// The detailed results of the signature validation are available in LastJsonData.
// (If the non-success return status was caused by an error such as "file not found", then the
// LastJsonData would be empty.)
CkoJsonObject *json = [crypt LastJsonData];
json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

// Here is a sample result:
// See the parsing code below..

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

// {
//   "pkcs7": {
//     "verify": {
//       "digestAlgorithms": [
//         "sha256"
//       ],
//       "signerInfo": [
//         {
//           "cert": {
//             "serialNumber": "00DCB814678CDB",
//             "issuerCN": "LevelBCAOK",
//             "issuerDN": "",
//             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//             "digestAlgName": "SHA256"
//           },
//           "contentType": "1.2.840.113549.1.7.1",
//           "signingTime": "131203065741Z",
//           "messageDigest": "JJZt41Nt8VsYahP+Xti4rR3vBDkUfRd6gquItl6R5Os=",
//           "signingAlgOid": "1.2.840.113549.1.1.1",
//           "signingAlgName": "RSA-PKCSV-1_5",
//           "authAttr": {
//             "1.2.840.113549.1.9.3": {
//               "name": "contentType",
//               "oid": "1.2.840.113549.1.7.1"
//             },
//             "1.2.840.113549.1.9.5": {
//               "name": "signingTime",
//               "utctime": "131203065741Z"
//             },
//             "1.2.840.113549.1.9.4": {
//               "name": "messageDigest",
//               "digest": "JJZt41Nt8VsYahP+Xti4rR3vBDkUfRd6gquItl6R5Os="
//             },
//             "1.2.840.113549.1.9.16.2.47": {
//               "name": "signingCertificateV2",
//               "der": "MIGIMIGFMIGCBCBJrxOU0w0dWGsVovjLv9QDH3syB5mLVv3grSYA40x9IDBeMFOkUTBPMQswCQYDVQQGEwJGUjENMAsGA1UEChMERVRTSTEcMBoGA1UECwwTUGx1Z3Rlc3RzXzIwMTMtMjAxNDETMBEGA1UEAxMKTGV2ZWxCQ0FPSwIHANy4FGeM2w=="
//             }
//           },
//           "unauthAttr": {
//             "1.2.840.113549.1.9.16.2.14": {
//               "name": "timestampToken",
//               "der": "MIIL+AYJKoZI...u7CfcjURNTY=",
//               "verify": {
//                 "digestAlgorithms": [
//                   "sha256"
//                 ],
//                 "signerInfo": [
//                   {
//                     "cert": {
//                       "serialNumber": "01AA4592D36C61",
//                       "issuerCN": "RootCAOK",
//                       "issuerDN": "",
//                       "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//                       "digestAlgName": "SHA256"
//                     },
//                     "contentType": "1.2.840.113549.1.9.16.1.4",
//                     "messageDigest": "NSsMUrfoyCQ0OszPE1YLx1j3EyyCiBmnE5Sua6ghu/Q=",
//                     "signingAlgOid": "1.2.840.113549.1.1.1",
//                     "signingAlgName": "RSA-PKCSV-1_5",
//                     "authAttr": {
//                       "1.2.840.113549.1.9.3": {
//                         "name": "contentType",
//                         "oid": "1.2.840.113549.1.9.16.1.4"
//                       },
//                       "1.2.840.113549.1.9.4": {
//                         "name": "messageDigest",
//                         "digest": "NSsMUrfoyCQ0OszPE1YLx1j3EyyCiBmnE5Sua6ghu/Q="
//                       },
//                       "1.2.840.113549.1.9.16.2.47": {
//                         "name": "signingCertificateV2",
//                         "der": "MIGGMIGDMIGABCDB/np5UxvhcPnSxD2Kme+C88uXGCMWLAvFPHNvTApTWDBcMFGkTzBNMQswCQYDVQQGEwJGUjENMAsGA1UEChMERVRTSTEcMBoGA1UECwwTUGx1Z3Rlc3RzXzIwMTMtMjAxNDERMA8GA1UEAxMIUm9vdENBT0sCBwGqRZLTbGE="
//                       }
//                     }
//                   }
//                 ]
//               },
//               "timestampSignatureVerified": true,
//               "tstInfo": {
//                 "tsaPolicyId": "1.3.6.1.4.1.2706.2.2.5.2.1.1.1",
//                 "messageImprint": {
//                   "hashAlg": "sha256",
//                   "digest": "C8xEe9NA4X1cUyHGX9zG89ipmQ2byFs3aa+Xe4Fz2P0=",
//                   "digestMatches": true
//                 },
//                 "serialNumber": "313E162121D922",
//                 "genTime": "20131203065742Z"
//               }
//             }
//           }
//         }
//       ]
//     }
//   }
// }
// 

int i;
int count_i;
NSString *strVal = 0;
NSString *certSerialNumber = 0;
NSString *certIssuerCN = 0;
NSString *certIssuerDN = 0;
NSString *certDigestAlgOid = 0;
NSString *certDigestAlgName = 0;
NSString *contentType = 0;
CkoDtObj *signingTime = [[CkoDtObj alloc] init];
NSString *messageDigest = 0;
NSString *signingAlgOid = 0;
NSString *signingAlgName = 0;
NSString *authAttrContentTypeName = 0;
NSString *authAttrContentTypeOid = 0;
NSString *authAttrSigningTimeName = 0;
CkoDtObj *authAttrSigningTimeUtctime = [[CkoDtObj alloc] init];
NSString *authAttrMessageDigestName = 0;
NSString *authAttrMessageDigestDigest = 0;
NSString *authAttrSigningCertificateV2Name = 0;
NSString *authAttrSigningCertificateV2Der = 0;
NSString *unauthAttrTimestampTokenName = 0;
NSString *unauthAttrTimestampTokenDer = 0;
BOOL unauthAttrTimestampTokenTimestampSignatureVerified;
NSString *unauthAttrTimestampTokenTstInfoTsaPolicyId = 0;
NSString *unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = 0;
NSString *unauthAttrTimestampTokenTstInfoMessageImprintDigest = 0;
BOOL unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches;
NSString *unauthAttrTimestampTokenTstInfoSerialNumber = 0;
CkoDtObj *unauthAttrTimestampTokenTstInfoGenTime = [[CkoDtObj alloc] init];
int j;
int count_j;

// Iterate over the hash algorithms used in the signature.
i = 0;
count_i = [[json SizeOfArray: @"pkcs7.verify.digestAlgorithms"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];
    strVal = [json StringOf: @"pkcs7.verify.digestAlgorithms[i]"];
    i = i + 1;
}

// For each signer...
i = 0;
count_i = [[json SizeOfArray: @"pkcs7.verify.signerInfo"] intValue];
while (i < count_i) {
    json.I = [NSNumber numberWithInt: i];

    // Get information about the certificate used by this signer.
    certSerialNumber = [json StringOf: @"pkcs7.verify.signerInfo[i].cert.serialNumber"];
    certIssuerCN = [json StringOf: @"pkcs7.verify.signerInfo[i].cert.issuerCN"];
    certIssuerDN = [json StringOf: @"pkcs7.verify.signerInfo[i].cert.issuerDN"];
    certDigestAlgOid = [json StringOf: @"pkcs7.verify.signerInfo[i].cert.digestAlgOid"];
    certDigestAlgName = [json StringOf: @"pkcs7.verify.signerInfo[i].cert.digestAlgName"];

    // Get additional information for this signer, such as the signingTime, signature algorithm, etc.
    contentType = [json StringOf: @"pkcs7.verify.signerInfo[i].contentType"];
    [json DtOf: @"pkcs7.verify.signerInfo[i].signingTime" bLocal: NO dt: signingTime];
    messageDigest = [json StringOf: @"pkcs7.verify.signerInfo[i].messageDigest"];
    signingAlgOid = [json StringOf: @"pkcs7.verify.signerInfo[i].signingAlgOid"];
    signingAlgName = [json StringOf: @"pkcs7.verify.signerInfo[i].signingAlgName"];

    // --------------------------------
    // Examine authenticated attributes.
    // --------------------------------

    // contentType
    if ([json HasMember: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\""] == YES) {
        authAttrContentTypeName = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name"];
        authAttrContentTypeOid = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid"];
    }

    // signingTime
    if ([json HasMember: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\""] == YES) {
        authAttrSigningTimeName = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name"];
        [json DtOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime" bLocal: NO dt: authAttrSigningTimeUtctime];
    }

    // messageDigest
    if ([json HasMember: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\""] == YES) {
        authAttrMessageDigestName = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name"];
        authAttrMessageDigestDigest = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest"];
    }

    // signingCertificateV2
    if ([json HasMember: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\""] == YES) {
        authAttrSigningCertificateV2Name = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".name"];
        authAttrSigningCertificateV2Der = [json StringOf: @"pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".der"];
    }

    // --------------------------------
    // Examine unauthenticated attributes.
    // --------------------------------

    // timestampToken  (the timestampToken is what makes this signature a CAdES-T)
    if ([json HasMember: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\""] == YES) {

        unauthAttrTimestampTokenName = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".name"];
        unauthAttrTimestampTokenDer = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".der"];

        // This is where we find out if the timestampToken's signature is valid.
        unauthAttrTimestampTokenTimestampSignatureVerified = [json BoolOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".timestampSignatureVerified"];

        unauthAttrTimestampTokenTstInfoTsaPolicyId = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.tsaPolicyId"];
        unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.hashAlg"];
        unauthAttrTimestampTokenTstInfoMessageImprintDigest = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.digest"];

        // Here is where we check to see if the digest in the timestampToken's messageImprint matches the digest of the signature of this signerInfo
        unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = [json BoolOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.digestMatches"];

        unauthAttrTimestampTokenTstInfoSerialNumber = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.serialNumber"];

        // Here is where we get the date/time of the timestampToken (i.e. when it was timestamped)
        [json DtOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.genTime" bLocal: NO dt: unauthAttrTimestampTokenTstInfoGenTime];

        // The following code gets details about the validity of the timestampToken's signature...
        j = 0;
        count_j = [[json SizeOfArray: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.digestAlgorithms"] intValue];
        while (j < count_j) {
            json.J = [NSNumber numberWithInt: j];
            strVal = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.digestAlgorithms[j]"];
            j = j + 1;
        }

        j = 0;
        count_j = [[json SizeOfArray: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo"] intValue];
        while (j < count_j) {
            json.J = [NSNumber numberWithInt: j];
            certSerialNumber = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.serialNumber"];
            certIssuerCN = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.issuerCN"];
            certIssuerDN = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.issuerDN"];
            certDigestAlgOid = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.digestAlgOid"];
            certDigestAlgName = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.digestAlgName"];
            contentType = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].contentType"];
            messageDigest = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].messageDigest"];
            signingAlgOid = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingAlgOid"];
            signingAlgName = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingAlgName"];
            authAttrContentTypeName = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.3\".name"];
            authAttrContentTypeOid = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.3\".oid"];
            authAttrMessageDigestName = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.4\".name"];
            authAttrMessageDigestDigest = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.4\".digest"];
            authAttrSigningCertificateV2Name = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.16.2.47\".name"];
            authAttrSigningCertificateV2Der = [json StringOf: @"pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.16.2.47\".der"];
            j = j + 1;
        }

    }

    i = i + 1;
}

if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    NSLog(@"%@",@"CAdES-T verification failed.");
}
else {
    NSLog(@"%@",@"CAdES-T signature is valid.");
}
 

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