private static string DecryptWithAes(Message me, User user)
{
var key = EncryptionServices.DecryptWithRsa(me.EncryptedAesKey, user.PrivateKey);
var iv = Convert.FromBase64String(me.EncryptedAesIV);
var decryptWithAes = EncryptionServices.DecryptWithAes(
Convert.FromBase64String(me.EncryptedContentOfMessage), key, iv);
return(decryptWithAes.Length == 0 ? string.Empty : decryptWithAes);
}