| 1234567891011121314151617181920 | using System;namespace Renci.SshNet.Security.Cryptography{    /// <summary>    /// Base class of stream cipher algorithms.    /// </summary>    public abstract class StreamCipher : SymmetricCipher    {        /// <summary>        /// Initializes a new instance of the <see cref="StreamCipher"/> class.        /// </summary>        /// <param name="key">The key.</param>        /// <exception cref="ArgumentNullException"><paramref name="key"/> is null.</exception>        protected StreamCipher(byte[] key)            : base(key)        {        }    }}
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