How to run C# Sample Code for MLE

[Dakuan]

Hi there. 

I am try to use your code to call Card On File data inquiry endpoint and I got an error said" Expected input credential was not present". Details below:

The error is :

Could you please advise. Thanks

[Dakuan]

By the way, you may need to check the header details below:
// Add headers
request.Headers["Authorization"] = GetBasicAuthHeader(VisaCardOnFileSettings.TwoWaySslUserId, VisaCardOnFileSettings.TwoWaySslPassword);
request.Headers["ex-correlation-id"] = GetCorrelationId();
request.Headers["keyId"] = VisaCardOnFileSettings.MleKeyId;

[shameem]

Hi @Dakuan ,

We have tested the C# sample code in the tutorial and it works fine.

Kindly note for 2-Way SSL, you don't need to provide the Root and Intermediate certificate.

I would suggest you to take the sample code provided in this tutorial as it is, replace with your credentials and add the below function with the VDP Sample Payload.

public string CardOnFileDataService()
        {
            string localTransactionDateTime = DateTime.Now.ToString("yyyy-MM-dd'T'HH:mm:ss");
            string requestBody = "{\"requestHeader\":{\"requestMessageId\":\"6da6b8b024532a2e0eacb1af58581\",\"messageDateTime\":\"2019-02-3505:25:12.327\"},\"requestData\":{\"pANs\":[4072208010000000],\"group\":\"STANDARD\"}}";

            string requestURL = "cofds-web/v1/datainfo";

            return GetDecryptedPayload(DoMutualAuthCall(requestURL, "POST", "Card On File Data Service With MLE", getEncryptedPayload(requestBody), null));
        }

And using the below main function to execute the API call.

static void Main(string[] args)
{
   Program p = new Program();
   string decryptedPayload = p.CardOnFileDataService();
   Console.WriteLine("Decrypted Response\n" + decryptedPayload);
}

Please give it a try and let us know if you face any further issue.

Thank you

[Dakuan]

Thanks @shameem.
After replace your example, I still got same issue. 😞

The certificate that I am using here
var clientCertificate = new X509Certificate2(VisaCardOnFileSettings.TwoWaySslClientCertificateP12Path,
VisaCardOnFileSettings.TwoWaySslClientCertificateP12Password);
request.ClientCertificates.Add(clientCertificate);
I got this certificate via openssl, it was from the private key (I download when project created) and client cert, is that correct?

Also I have downloaded another key after I enabled mle, after click add CSR button. but seems like I am not using this key in the code. It could be the issue?

Thanks.

[shameem]

Hi @Dakuan ,

This looks more like an issue with your p12 file created.

Could you please double check the .p12 contains both the private and the public key.  The below command should list the certificates in the .p12 file

openssl pkcs12 -info -in cert.p12

Kindly note that the the 2-Way SSL Certificate Subject contains the UID of your project and corresponding Key file with the same UID (in the file name) which you have downloaded, should be used to created the P12 file.

openssl pkcs12 -export -inkey key_<UID / PROJECT ID>.pem -in cert.pem -out cert.p12

The MLE private key is used for decrypting the response. Note that MLE Certificates and key contains the MLE Key ID so not to be confused with the 2Way SSL certificate.

//For MLE
public static string keyId = "<MLE_KEY_ID>";
public static string mleClientPrivateKey = "<PATH>/server_cert_<MLE_KEY_ID>.pem";
public static string mleServerPublicCertificate = "<PATH>/key_<MLE_KEY_ID>.pem"; 

I hope that helps.

Thank you

[vhuzov]

Hi @asaldanha

I know it is too late but want to leave the solution for the next error   

Unable to cast object of type 'Org.BouncyCastle.X509.X509Certificate' to type 'Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair'.

The code below resolve this error

   private static RSA ImportPrivateKey(string privateKeyFile)

{

        var pr = new PemReader(File.OpenText(privateKeyFile));

        var rsaPrivateKeyParameters = (RsaPrivateCrtKeyParameters)pr.ReadObject();
        var rsaParams = DotNetUtilities.ToRSAParameters(rsaPrivateKeyParameters);

        var rsa = RSA.Create();
        rsa.ImportParameters(rsaParams);

        return rsa;

}