C# DES加密解密

[水目]

照着网上的谢了两个加密解密的方法

加密之后解密不出来，请各位给讲解下加密解密的原理

顺带帮我修改下代码

DES操作类

 /// <summary>
    /// key和IV都用了key的值
    /// </summary>
    public static class DES
    {
        private static string key = "12345678";

        //加密
        public static string Encrypt(string text)
        {
            return Encrypt(text, key);
        }

        public static string Encrypt(string text, string key)
        {
            DESCryptoServiceProvider DESProvider = new DESCryptoServiceProvider();

            byte[] textbuffer = Encoding.Default.GetBytes(text);
            byte[] keybuffer = Encoding.Default.GetBytes(key);

            DESProvider.Key = keybuffer;
            DESProvider.IV = keybuffer;

            System.IO.MemoryStream mStream = new System.IO.MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, DESProvider.CreateEncryptor(), CryptoStreamMode.Write);
            cStream.Write(textbuffer, 0, textbuffer.Length);
            cStream.FlushFinalBlock();

            StringBuilder newtext = new StringBuilder();
            foreach (byte b in mStream.ToArray())
            {
                newtext.AppendFormat("{0:X2}", b);
            }
            return newtext.ToString();
 
        }


        //解密
        public static string Decrypt(string text)
        {
            return Encrypt(text, key);
        }

        public static string Decrypt(string text, string key)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] textByteArray = new byte[text.Length / 2];

            for (int x = 0; x < text.Length / 2; x++)
            {
                int i = (Convert.ToInt32(text.Substring(x * 2, 2), 16));
                textByteArray[x] = (byte)i;
            }

            des.Key = Encoding.Default.GetBytes(key);
            des.IV = Encoding.Default.GetBytes(key);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read);
            cs.Write(textByteArray, 0, textByteArray.Length);
            cs.FlushFinalBlock();
            return System.Text.Encoding.Default.GetString(ms.ToArray());
             
        }
    }

调用
加密

解密

[Bonjour-你好]

http://www.codeproject.com/Articles/19538/Encrypt-Decrypt-String-using-DES-in-C

[rtdb]

       //解密
        public static string Decrypt(string text)
        {
            return Encrypt(text, key);
        }

解密方法你调用成加密了。换一下再试。

[水目]

引用 1 楼 KumaPower 的回复:

http://www.codeproject.com/Articles/19538/Encrypt-Decrypt-String-using-DES-in-C

引用 2 楼 rtdb 的回复:

       //解密
        public static string Decrypt(string text)
        {
            return Encrypt(text, key);
        }

解密方法你调用成加密了。换一下再试。

谢谢二位了，不仅仅是2楼说的错误，其他的地方也有错误。 不过已经解决，谢谢二位了