Node.js

Validate Certificate using OCSP Protocol

See more Certificates Examples

Demonstrates how to validate a certificate (check the revoked status) using the OCSP protocol. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    // This example will check the revoked status of a certificate loaded from a file.
    var cert = new chilkat.Cert();
    success = cert.LoadFromFile("qa_data/certs/google.crt");
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    // Get the cert's OCSP URL.
    var ocspUrl = cert.OcspUrl;

    // Build the JSON that will be the OCSP request.

    // Possible hash algorithms are sha1, sha256, sha384, sha512.  
    var hashAlg = "sha256";
    var prng = new chilkat.Prng();
    var json = new chilkat.JsonObject();
    json.EmitCompact = false;
    // Read more about OCSP nonce lengths
    json.UpdateString("extensions.ocspNonce",prng.GenRandom(16,"base64"));
    json.I = 0;
    json.UpdateString("request[i].cert.hashAlg",hashAlg);
    json.UpdateString("request[i].cert.issuerNameHash",cert.HashOf("IssuerDN",hashAlg,"base64"));
    json.UpdateString("request[i].cert.issuerKeyHash",cert.HashOf("IssuerPublicKey",hashAlg,"base64"));
    json.UpdateString("request[i].cert.serialNumber",cert.SerialNumber);

    console.log(json.Emit());

    // Our OCSP request looks something like this:
    // {
    //   "extensions": {
    //     "ocspNonce": "qZDfbpO+nUxRzz6c/SPjE5QCAsPfpkQlRDxTnGl0gnxt7iXO"
    //   },
    //   "request": [
    //     {
    //       "cert": {
    //         "hashAlg": "sha1",
    //         "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=",
    //         "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
    //         "serialNumber": "6175535D87BF94B6"
    //       }
    //     }
    //   ]
    // }

    var ocspRequest = new chilkat.BinData();
    var http = new chilkat.Http();

    // Convert our JSON to a binary (ASN.1) OCSP request
    success = http.CreateOcspRequest(json,ocspRequest);
    if (success == false) {
        console.log(http.LastErrorText);
        return;
    }

    // Send the OCSP request to the OCSP server
    var resp = new chilkat.HttpResponse();
    success = http.HttpBd("POST",ocspUrl,ocspRequest,"application/ocsp-request",resp);
    if (success == false) {
        console.log(http.LastErrorText);
        return;
    }

    // Get the binary (ASN.1) OCSP reply
    var ocspReply = new chilkat.BinData();
    resp.GetBodyBd(ocspReply);

    // Convert the binary reply to JSON.
    // Also returns the overall OCSP response status.
    var jsonReply = new chilkat.JsonObject();
    var ocspStatus = http.ParseOcspReply(ocspReply,jsonReply);

    // The ocspStatus can have one of these values:
    // -1:  The ARG1 does not contain a valid OCSP reply.
    // 0:  Successful - Response has valid confirmations..
    // 1: Malformed request - Illegal confirmation request.
    // 2: Internal error - Internal error in issuer.
    // 3: Try later -  Try again later.
    // 4: Not used - This value is never returned.
    // 5: Sig required - Must sign the request.
    // 6: Unauthorized - Request unauthorized.

    if (ocspStatus < 0) {
        console.log("Invalid OCSP reply.");
        return;
    }

    console.log("Overall OCSP Response Status: " + ocspStatus);

    // Let's examine the OCSP response (in JSON).
    jsonReply.EmitCompact = false;
    console.log(jsonReply.Emit());

    // The JSON reply looks like this:
    // (Use the online tool at https://tools.chilkat.io/jsonParse.cshtml
    // to generate JSON parsing code.)

    // {
    //   "responseStatus": 0,
    //   "responseTypeOid": "1.3.6.1.5.5.7.48.1.1",
    //   "responseTypeName": "ocspBasic",
    //   "response": {
    //     "responderIdChoice": "KeyHash",
    //     "responderKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
    //     "dateTime": "20180803193937Z",
    //     "cert": [
    //       {
    //         "hashOid": "1.3.14.3.2.26",
    //         "hashAlg": "SHA-1",
    //         "issuerNameHash": "9u2wY2IygZo19o11oJ0CShGqbK0=",
    //         "issuerKeyHash": "d8K4UJpndnaxLcKG0IOgfqZ+uks=",
    //         "serialNumber": "6175535D87BF94B6",
    //         "status": 0,
    //         "thisUpdate": "20180803193937Z",
    //         "nextUpdate": "20180810193937Z"
    //       }
    //     ]
    //   }
    // }
    // 

    // The certificate status:
    var certStatus = -1;
    if (jsonReply.HasMember("response.cert[0].status") == true) {
        certStatus = jsonReply.IntOf("response.cert[0].status");
    }

    // Possible certStatus values are:
    // -1: No status returned.
    // 0: Good
    // 1: Revoked
    // 2: Unknown.
    console.log("Certificate Status: " + certStatus);

}

chilkatExample();