private void DecriptData(DataMessageStanza dataMessageStanza)
{
string cryptoKey = dataMessageStanza.AppData.Where(item => item.Key == "crypto-key").Select(item => item.Value).FirstOrDefault();
string salt = dataMessageStanza.AppData.Where(item => item.Key == "encryption").Select(item => item.Value).FirstOrDefault();
if (cryptoKey != null && salt != null)
{
byte[] cryptoKeyBytes = UrlSafeBase64Convertor.FromBase64(cryptoKey.Substring(3));
byte[] saltBytes = UrlSafeBase64Convertor.FromBase64(salt.Substring(5));
var decryptedBytes = cryptography.Decrypt(dataMessageStanza.RawData.ToByteArray(), cryptoKeyBytes, saltBytes);
Volatile.Read(ref MessageReceived)?.Invoke(this, Encoding.UTF8.GetString(decryptedBytes));
}
else
{
if (cryptoKey != null)
{
Debug.WriteLine("CryptoKey is missing");
}
if (salt != null)
{
Debug.WriteLine("salt is missing");
}
}
}
public async Task <FcmRegistration> Register(ulong senderId, string token, byte[] publicKey, byte[] authSecret)
{
byte[] randomBytes = new byte[16];;
using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
{
rng.GetBytes(randomBytes);
}
Dictionary <string, string> postData = new Dictionary <string, string>();
postData.Add("authorized_entity", senderId.ToString());
postData.Add("endpoint", $"{sendUrl}/{token}");
postData.Add("encryption_key", UrlSafeBase64Convertor.ToBase64(publicKey));
postData.Add("encryption_auth", UrlSafeBase64Convertor.ToBase64(authSecret));
JObject jsonData = null;
using (var httpClient = new HttpClient())
using (var content = new FormUrlEncodedContent(postData))
{
httpClient.DefaultRequestHeaders.Clear();
httpClient.DefaultRequestHeaders.ExpectContinue = false;
httpClient.DefaultRequestHeaders.ConnectionClose = true;
HttpResponseMessage response = await httpClient.PostAsync(subscribeUrl, content).ConfigureAwait(false);
if (response.StatusCode == HttpStatusCode.OK)
{
using (Stream stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
jsonData = (JObject)DeserializeFromStream(stream);
}
}
else
{
throw new InvalidOperationException("Cannot register to FCM");
}
}
return(new FcmRegistration((string)((JValue)jsonData["token"]).Value, (string)((JValue)jsonData["pushSet"]).Value));
}
