JavaScript Requires Chilkat v11.0.0+

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. JavaScript

var success = false;

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

var crypt = new CkCrypt2();

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 CkJsonObject();
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!");