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(Java) Validate Certificate using OCSP Protocol

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

Note: This example requires Chilkat v9.5.0.75 or greater

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  Note: Requires Chilkat v9.5.0.75 or greater.

    //  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.
    CkCert cert = new CkCert();
    boolean success = cert.LoadFromFile("qa_data/certs/google.crt");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    //  Get the cert's OCSP URL.
    String ocspUrl = cert.ocspUrl();

    //  Build the JSON that will be the OCSP request.
    CkPrng prng = new CkPrng();
    CkJsonObject json = new CkJsonObject();
    json.put_EmitCompact(false);
    json.UpdateString("extensions.ocspNonce",prng.genRandom(36,"base64"));
    json.put_I(0);
    json.UpdateString("request[i].cert.hashAlg","sha1");
    json.UpdateString("request[i].cert.issuerNameHash",cert.hashOf("IssuerDN","sha1","base64"));
    json.UpdateString("request[i].cert.issuerKeyHash",cert.hashOf("IssuerPublicKey","sha1","base64"));
    json.UpdateString("request[i].cert.serialNumber",cert.serialNumber());

    System.out.println(json.emit());

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

    CkBinData ocspRequest = new CkBinData();
    CkHttp http = new CkHttp();

    //  Convert our JSON to a binary (ASN.1) OCSP request
    http.CreateOcspRequest(json,ocspRequest);

    //  Send the OCSP request to the OCSP server
    CkHttpResponse resp = http.PBinaryBd("POST",ocspUrl,ocspRequest,"application/ocsp-request",false,false);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

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

    //  Convert the binary reply to JSON.
    //  Also returns the overall OCSP response status.
    CkJsonObject jsonReply = new CkJsonObject();
    int 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) {
        System.out.println("Invalid OCSP reply.");
        return;
        }

    System.out.println("Overall OCSP Response Status: " + ocspStatus);

    //  Let's examine the OCSP response (in JSON).
    jsonReply.put_EmitCompact(false);
    System.out.println(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:
    int certStatus = json.IntOf("response.cert[0].status");

    //  Possible certStatus values are:
    //  0: Good
    //  1: Revoked
    //  2: Unknown.
    System.out.println("Certificate Status: " + certStatus);
  }
}

 

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