DES字符串加密

      /// <summary>
    /// 通过DES对称加密算法,完成对字符串的加密和解密操作。
    /// </summary>
    public class Encrypt
    {
        private SymmetricAlgorithm mCSP;
        private const string CIV = "****";//密钥
        private const string CKEY = "****";//初始化向量

        public Encrypt()
        {
            mCSP = new DESCryptoServiceProvider();
        }

        public string EncryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            try
            {
                ct = mCSP.CreateEncryptor(Convert.FromBase64String(CKEY), Convert.FromBase64String(CIV));

                byt = Encoding.UTF8.GetBytes(Value);

                ms = new MemoryStream();
                cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
                cs.Write(byt, 0, byt.Length);
                cs.FlushFinalBlock();

                cs.Close();

                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception)
            {
                return "";
            }
        }

        public string DecryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            try
            {
                ct = mCSP.CreateDecryptor(Convert.FromBase64String(CKEY), Convert.FromBase64String(CIV));

                byt = Convert.FromBase64String(Value);

                ms = new MemoryStream();
                cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
                cs.Write(byt, 0, byt.Length);
                cs.FlushFinalBlock();

                cs.Close();

                return Encoding.UTF8.GetString(ms.ToArray());
            }
            catch (Exception)
            {
                return "";
            }


        }

    }