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Ringcentral subscription NotificationEvent Decrypt Method issue
Tags: sdk
Jan 15, 2020 at 11:11pm   •   1 replies  •  0 likes
Pramod Kangare

We are impelementing Ringcentral Subscription functionality.

For that We are using code from github url:

We are facing issue in class SubscriptionService.cs:

Below is method where we actually facing issue:

private void OnSubscribe(string result)


var message = JsonConvert.DeserializeObject<string[]>(result)[0];

NotificationEvent?.Invoke(this, new SubscriptionEventArgs(Decrypt(message)));


We dont know what happen in Decrypt(message) function because Debug not going through that code i.e Decrypt(message). message parameter showing encrypted key

Below is Decrypt method:

private object Decrypt(string dataString)


var key = Convert.FromBase64String(subscriptionInfo.DeliveryMode.EncryptionKey);

var keyParameter = ParameterUtilities.CreateKeyParameter("AES", key);

var cipher = CipherUtilities.GetCipher("AES/ECB/PKCS7Padding");

cipher.Init(false, keyParameter);

var data = Convert.FromBase64String(dataString);

var memoryStream = new MemoryStream(data, false);

var cipherStream = new CipherStream(memoryStream, cipher, null);

var bufferSize = 1024;

var buffer = new byte[bufferSize];

var length = 0;

var resultStream = new MemoryStream();

while ((length = cipherStream.Read(buffer, 0, bufferSize)) > 0)


resultStream.Write(buffer, 0, length);


var resultBytes = resultStream.ToArray();

var result = Encoding.UTF8.GetString(resultBytes, 0, resultBytes.Length);

return JsonConvert.DeserializeObject(result);


Please guide us...!!

Thank you..!!

1 Answer
answered on Jan 16, 2020 at 8:56am  

The c-sharp SDK has been deprecated for years and it was mentioned on the repo README file.

Can you port your app to use the latest .Net SDK then let me know if you are still facing the problem.


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