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(MFC) 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 C/C++ Library Downloads

MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>
#include <CkJsonObject.h>
#include <CkDtObj.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkCrypt2 crypt;
    bool success;

    // Indicate that the CAdES-T timestamp tokens must also pass validation for the signature to be validated.
    CkJsonObject cmsOptions;
    cmsOptions.UpdateBool("ValidateTimestampTokens",true);
    crypt.put_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","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.)
    CkJsonObject *json = crypt.LastJsonData();
    json->put_EmitCompact(false);
    strOut.append(json->emit());
    strOut.append("\r\n");

    // 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;
    const char *strVal = 0;
    const char *certSerialNumber = 0;
    const char *certIssuerCN = 0;
    const char *certIssuerDN = 0;
    const char *certDigestAlgOid = 0;
    const char *certDigestAlgName = 0;
    const char *contentType = 0;
    CkDtObj signingTime;
    const char *messageDigest = 0;
    const char *signingAlgOid = 0;
    const char *signingAlgName = 0;
    const char *authAttrContentTypeName = 0;
    const char *authAttrContentTypeOid = 0;
    const char *authAttrSigningTimeName = 0;
    CkDtObj authAttrSigningTimeUtctime;
    const char *authAttrMessageDigestName = 0;
    const char *authAttrMessageDigestDigest = 0;
    const char *authAttrSigningCertificateV2Name = 0;
    const char *authAttrSigningCertificateV2Der = 0;
    const char *unauthAttrTimestampTokenName = 0;
    const char *unauthAttrTimestampTokenDer = 0;
    bool unauthAttrTimestampTokenTimestampSignatureVerified;
    const char *unauthAttrTimestampTokenTstInfoTsaPolicyId = 0;
    const char *unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = 0;
    const char *unauthAttrTimestampTokenTstInfoMessageImprintDigest = 0;
    bool unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches;
    const char *unauthAttrTimestampTokenTstInfoSerialNumber = 0;
    CkDtObj unauthAttrTimestampTokenTstInfoGenTime;
    int j;
    int count_j;

    // Iterate over the hash algorithms used in the signature.
    i = 0;
    count_i = json->SizeOfArray("pkcs7.verify.digestAlgorithms");
    while (i < count_i) {
        json->put_I(i);
        strVal = json->stringOf("pkcs7.verify.digestAlgorithms[i]");
        i = i + 1;
    }

    // For each signer...
    i = 0;
    count_i = json->SizeOfArray("pkcs7.verify.signerInfo");
    while (i < count_i) {
        json->put_I(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",false,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\"") == true) {
            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\"") == true) {
            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",false,authAttrSigningTimeUtctime);
        }

        // messageDigest
        if (json->HasMember("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\"") == true) {
            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\"") == true) {
            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\"") == true) {

            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",false,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");
            while (j < count_j) {
                json->put_J(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");
            while (j < count_j) {
                json->put_J(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 != true) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        strOut.append("CAdES-T verification failed.");
        strOut.append("\r\n");
    }
    else {
        strOut.append("CAdES-T signature is valid.");
        strOut.append("\r\n");
    }

    delete json;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }

 

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