<PackageReference Include="SSH.NET" Version="2020.0.1" />

Renci.SshNet.Security.Cryptography.SymmetricCipher

public abstract class SymmetricCipher : Cipher
protected byte[] Key { get; }

protected SymmetricCipher(byte[] key)

public abstract int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)

public abstract int EncryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)