namespace Renci.SshNet.Security.Cryptography { public abstract class BlockCipher : SymmetricCipher { public byte BlockSize { get; } protected BlockCipher(byte[] key, byte blockSize, CipherMode mode, IBlockCipherPadding padding); 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); } } namespace Renci.SshNet.Common { internal sealed class ReadOnlyMemoryOwner : IMemoryOwner<byte>, IDisposable { public int Length { get; } public bool IsEmpty { get; } public ReadOnlySpan<byte> Span { get; } public ReadOnlyMemoryOwner(System.Net.ArrayBuffer buffer); public void Slice(int start); public void Dispose(); } }