/// <exception cref="Exception"></exception>
/// <param name="message"></param>
/// <param name="privateKey">Must be base64 string</param>
/// <returns></returns>
public DecryptedMessageDto Decrypt(EncryptedMessage message, string privateKey, bool privateKeyIsReciever)
{
var recieverPrivateKey = Convert.FromBase64String(privateKey);
using (var rsa = new RSACryptoServiceProvider(KeysConfiguration.RSAKeysBits))
{
rsa.ImportCspBlob(recieverPrivateKey);
rsa.PersistKeyInCsp = false;
var aesKey = rsa.Decrypt(Convert.FromBase64String(privateKeyIsReciever ? message.ToKey : message.FromKey), true);
using (var aes = new AesCryptoServiceProvider())
{
aes.Padding = PaddingMode.PKCS7;
aes.Mode = CipherMode.CBC;
aes.Key = aesKey;
aes.IV = Convert.FromBase64String(message.IV);
var aesDecryptor = aes.CreateDecryptor();
DecryptedMessageDto messageDto = new DecryptedMessageDto();
messageDto.Id = message.Id;
messageDto.To = message.To;
messageDto.From = message.From;
messageDto.Timestamp = message.Timestamp;
messageDto.Title = DecryptData(aesDecryptor, message.Title);
messageDto.Content = DecryptData(aesDecryptor, message.Content);
return(messageDto);
}
}
}
public bool Validate(EncryptedMessage message)
{
foreach (var validator in _validators)
{
if (!validator.Validate(message))
{
return(false);
}
}
return(true);
}
public async Task <bool> TryAddAsync(EncryptedMessage message)
{
var id = message.Id;
if (!_messageValidator.Validate(message))
{
return(false);
}
if (GetMessageById(message.Id) != null)
{
return(false);
}
try
{
var messageDb = new EncryptedMessageStore(message);
_applicationDatabase.Messages.Add(messageDb);
return(await _applicationDatabase.SaveChangesAsync() > 0);
}
catch (DbException)
{
return(false);
}
}
public EncryptedMessageBuilder(IHashCash hashCash)
{
_message = new EncryptedMessage();
_hashCash = hashCash;
}
public bool TryGet(string id, out EncryptedMessage message)
{
message = GetMessageById(id);
return(message != null ? true : false);
}