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解密函数在这里了，加密函数该如何写呢？

     public static string JeMi(string data)
        {
            if (data == null)
            {
                throw new ArgumentNullException("data");
            }
            try
            {
                string str;
                SymmetricAlgorithm algorithm = TDESP();
                byte[] buffer = Convert.FromBase64String(data);
                MemoryStream stream = new MemoryStream();
                CryptoStream stream2 = new CryptoStream(stream, algorithm.CreateDecryptor(), CryptoStreamMode.Write);
                try
                {
                    stream2.Write(buffer, 0, buffer.Length);
                    str = Encoding.UTF8.GetString(stream.ToArray());
                    int startIndex = str.IndexOf("\r\n", 0, str.Length);
                    str = str.Remove(startIndex, str.Length - startIndex);
                }
                finally
                {
                    stream2.Close();
                    stream.Close();
                }
                return str;
            }
            catch (Exception)
            {
                return null;
            }
        }

        private static TripleDESCryptoServiceProvider TDESP()
        {
            TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider();
            provider.KeySize = 0xc0;
            provider.Key = new byte[] {
            0xae, 5, 0x39, 0x5d, 0x42, 0x98, 0x42, 0xa4, 0x4e, 0x29, 0x91, 0x70, 0x19, 0x6f, 0xe8, 0x4d,
            8, 0x74, 0xb9, 0xb0, 0x70, 0x7c, 0x69, 0x91
         };
            provider.IV = new byte[] { 0x1b, 0xf6, 0x95, 0xaf, 0x7d, 0xd6, 90, 0x4f };
            provider.Mode = CipherMode.CBC;
            provider.Padding = PaddingMode.Zeros;
            return provider;
        }