/// <summary>
/// Decrypts and deserializes the input object using AES
/// </summary>
/// <param name="aes">The configured AES instance</param>
/// <param name="input">The encrypted event object</param>
/// <returns>The decrypted event object</returns>
private static async Task <Event> Decrypt(Aes aes, EncryptedEvent input)
{
aes.IV = input.InitializationVector;
var decryptor = aes.CreateDecryptor();
string output;
using (MemoryStream memoryStream = new MemoryStream(input.Content))
{
using CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
using StreamReader streamReader = new StreamReader(cryptoStream);
output = await streamReader.ReadToEndAsync();
}
return(JsonConvert.DeserializeObject <Event>(output, _serializerSettings));
}
public async Task Add(string key, EncryptedEvent @event)
{
if (!string.IsNullOrEmpty(key))
{
if (!_eventStreams.ContainsKey(key))
{
_eventStreams.Add(key, new List <EncryptedEvent>());
}
// Check the event is at a valid location of the stream
if (_eventStreams[key].Count + 1 != @event.Location)
{
throw new EventConcurrencyException("Location of provided event is invalid");
}
_eventStreams[key].Add(@event);
await Task.Yield();
}
else
{
throw new ArgumentNullException("Key cannot be null or empty");
}
}