protected override bool ValidateExchangeHash()
{
//var exchangeHash = this.CalculateHash();
//var length = (uint)(this._hostKey[0] << 24 | this._hostKey[1] << 16 | this._hostKey[2] << 8 | this._hostKey[3]);
//var algorithmName = Encoding.UTF8.GetString(this._hostKey, 4, (int)length);
//var key = this.Session.ConnectionInfo.HostKeyAlgorithms[algorithmName](this._hostKey);
//this.Session.ConnectionInfo.CurrentHostKeyAlgorithm = algorithmName;
//if (this.CanTrustHostKey(key))
//{
// return key.VerifySignature(exchangeHash, this._signature);
//}
//else
//{
// return false;
//}
return false;
}