软件注册码（算法二Rijndael）

 /// <summary>
    /// Rijndael算法
    /// </summary>
    public class RijndaelCrypto : ICrypto
    {
        /// <summary>
        /// Key值
        /// </summary>
        private byte[] _key;
        /// <summary>
        /// IV向量
        /// </summary>
        private byte[] _iv = new byte[] { 107, 22, 226, 145, 208, 243, 46, 41 };
        public RijndaelCrypto(byte[] key)
        {
            this._key = key;
        }
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public byte[] Encrypt(byte[] bytes)
        {
            RijndaelManaged rm = this.GetProvider();
            ICryptoTransform it = rm.CreateEncryptor(rm.Key, rm.IV);
            return it.TransformFinalBlock(bytes, 0, bytes.Length);
        }
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public byte[] Decrypt(byte[] bytes)
        {
            RijndaelManaged rm = this.GetProvider();
            ICryptoTransform it = rm.CreateDecryptor(rm.Key, rm.IV);
            return it.TransformFinalBlock(bytes, 0, bytes.Length);
        }
        private RijndaelManaged GetProvider()
        {
            RijndaelManaged rm = new RijndaelManaged();
            rm.Key = this._key;
            rm.IV = this._iv;
            return rm;
        }
    }