using System; namespace Renci.SshNet.Security.Cryptography { public abstract class SymmetricCipher : Cipher { protected byte[] Key { get; set; } protected SymmetricCipher(byte[] key) { if (key == null) throw new ArgumentNullException("key"); Key = key; } public abstract int EncryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset); public abstract int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset); } }