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using System;
namespace Hazel.Dtls
{
/// <summary>
/// DTLS cipher suite interface for the handshake portion of
/// the connection.
/// </summary>
public interface IHandshakeCipherSuite : IDisposable
{
/// <summary>
/// Gets the size of the shared key
/// </summary>
/// <returns>Size of the shared key in bytes </returns>
int SharedKeySize();
/// <summary>
/// Calculate the size of the ServerKeyExchnage message
/// </summary>
/// <param name="privateKey">
/// Private key that will be used to sign the message
/// </param>
/// <returns>Size of the message in bytes</returns>
int CalculateServerMessageSize(object privateKey);
/// <summary>
/// Encodes the ServerKeyExchange message
/// </summary>
/// <param name="privateKey">Private key to use for signing</param>
void EncodeServerKeyExchangeMessage(ByteSpan output, object privateKey);
/// <summary>
/// Verifies the authenticity of a server key exchange
/// message and calculates the shared secret.
/// </summary>
/// <returns>
/// True if the authenticity has been validated and a shared key
/// was generated. Otherwise, false.
/// </returns>
bool VerifyServerMessageAndGenerateSharedKey(ByteSpan output, ByteSpan serverKeyExchangeMessage, object publicKey);
/// <summary>
/// Calculate the size of the ClientKeyExchange message
/// </summary>
/// <returns>Size of the message in bytes</returns>
int CalculateClientMessageSize();
/// <summary>
/// Encodes the ClientKeyExchangeMessage
/// </summary>
void EncodeClientKeyExchangeMessage(ByteSpan output);
/// <summary>
/// Verifies the validity of a client key exchange message
/// and calculats the hsared secret.
/// </summary>
/// <returns>
/// True if the client exchange message is valid and a
/// shared key was generated. Otherwise, false.
/// </returns>
bool VerifyClientMessageAndGenerateSharedKey(ByteSpan output, ByteSpan clientKeyExchangeMessage);
}
}
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