Node.js

Verify a .p7m and get Algorithm Information

See more Digital Signatures Examples

Demonstrates how to verify a .p7m and then examine the algorithms used by the signature. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var crypt = new chilkat.Crypt2();

    var inFile = "qa_data/p7m/brainpoolP256r1.p7m";
    var outFile = "qa_output/something.dat";

    // Verify and extract the signed data.
    success = crypt.VerifyP7M(inFile,outFile);
    if (success == false) {
        console.log(crypt.LastErrorText);
        return;
    }

    // Examine details about the signature(s)
    var json = new chilkat.JsonObject();
    crypt.GetLastJsonData(json);
    json.EmitCompact = false;
    console.log(json.Emit());

    // Sample output

    // {
    //   "pkcs7": {
    //     "verify": {
    //       "digestAlgorithms": [
    //         "sha256"
    //       ],
    //       "signerInfo": [
    //         {
    //           "cert": {
    //             "serialNumber": "FFFFE552B302FFFFFF1E34C3ACEB2FFFF",
    //             "issuerCN": "The common name of the cert...",
    //             "issuerDN": "",
    //             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
    //             "digestAlgName": "SHA256"
    //           },
    //           "contentType": "1.2.840.113549.1.7.1",
    //           "signingTime": "190409140500Z",
    //           "messageDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
    //           "signingAlgOid": "1.2.840.10045.4.3.2",
    //           "signerDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
    //           "authAttr": [
    //             {
    //               "oid": "1.2.840.113549.1.9.3",
    //               "oidName": "contentType"
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.5",
    //               "oidName": "signingTime"
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.52",
    //               "oidName": "1.2.840.113549.1.9.52",
    //               "der": "MBs ... AwI="
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.4",
    //               "oidName": "messageDigest"
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.16.2.47",
    //               "oidName": "signingCertificateV2",
    //               "der": "MCYw .. 7PlQ=="
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.20",
    //               "oidName": "1.2.840.113549.1.9.20"
    //             }
    //           ]
    //         }
    //       ]
    //     }
    //   }
    // }

    // Code for parsing the above JSON...
    var i;
    var count_i;
    var strVal;
    var certSerialNumber;
    var certIssuerCN;
    var certIssuerDN;
    var certDigestAlgOid;
    var certDigestAlgName;
    var contentType;
    var signingTime;
    var messageDigest;
    var signingAlgOid;
    var signerDigest;
    var j;
    var count_j;
    var oid;
    var oidName;
    var der;

    i = 0;
    count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms");
    while (i < count_i) {
        json.I = i;
        strVal = json.StringOf("pkcs7.verify.digestAlgorithms[i]");
        i = i+1;
    }

    i = 0;
    count_i = json.SizeOfArray("pkcs7.verify.signerInfo");
    while (i < count_i) {
        json.I = i;
        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");
        contentType = json.StringOf("pkcs7.verify.signerInfo[i].contentType");
        signingTime = json.StringOf("pkcs7.verify.signerInfo[i].signingTime");
        messageDigest = json.StringOf("pkcs7.verify.signerInfo[i].messageDigest");
        signingAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid");
        signerDigest = json.StringOf("pkcs7.verify.signerInfo[i].signerDigest");
        j = 0;
        count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].authAttr");
        while (j < count_j) {
            json.J = j;
            oid = json.StringOf("pkcs7.verify.signerInfo[i].authAttr[j].oid");
            oidName = json.StringOf("pkcs7.verify.signerInfo[i].authAttr[j].oidName");
            der = json.StringOf("pkcs7.verify.signerInfo[i].authAttr[j].der");
            j = j+1;
        }

        i = i+1;
    }

    console.log("Success!");

}

chilkatExample();