namespace Renci.SshNet.Security { public abstract class KeyExchange : Algorithm, IKeyExchange, IDisposable { protected Session Session { get; } public byte[] SharedKey { get; set; } public byte[] ExchangeHash { get; } public event EventHandler<HostKeyEventArgs> HostKeyReceived; public virtual void Start(Session session, KeyExchangeInitMessage message, bool sendClientInitMessage); public virtual void Finish(); public Cipher CreateServerCipher(out bool isAead); public Cipher CreateClientCipher(out bool isAead); public HashAlgorithm CreateServerHash(out bool isEncryptThenMAC); public HashAlgorithm CreateClientHash(out bool isEncryptThenMAC); public Compressor CreateCompressor(); public Compressor CreateDecompressor(); protected bool CanTrustHostKey(KeyHostAlgorithm host); protected abstract bool ValidateExchangeHash(); protected abstract byte[] CalculateHash(); protected abstract byte[] Hash(byte[] hashData); protected void SendMessage(Message message); public void Dispose(); protected virtual void Dispose(bool disposing); protected KeyExchange(); } }