求C#高手教我写DES算法。那位愿意收我为徒的啊?

解决方案 »

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    http://blog.csdn.net/lego2816/article/details/6698388
      

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     public sealed class DESEncryption
        {
            private static readonly string encryptKey = "YJSERVER";
            private static readonly string decryptKey = "YJSERVER";
            
            #region**********Method*******************************        /// <summary> 
            /// 加密字符串 
            /// 注意:密钥必须为8位 
            /// </summary> 
            /// <param name="strText">字符串</param> 
            /// <param name="encryptKey">密钥</param>
            /// <return>加密后字符串</return>
            public static string DesEncrypt(string strText) 
            {
                string outString="";
                byte[] byKey=null; 
                byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; 
                try 
                {
                    byKey = System.Text.Encoding.UTF8.GetBytes(encryptKey.Substring(0, encryptKey.Length)); 
                    DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                    byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); 
                    MemoryStream ms = new MemoryStream(); 
                    CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ; 
                    cs.Write(inputByteArray, 0, inputByteArray.Length); 
                    cs.FlushFinalBlock();
                    outString = Convert.ToBase64String(ms.ToArray()); 
                } 
                catch(System.Exception) 
                {
                    outString = ""; 
                }            return outString;
            }         /// <summary> 
            /// 解密字符串 
            /// </summary> 
            /// <param name="strText">加了密的字符串</param> 
            /// <param name="decryptKey">密钥</param> 
            public static string DesDecrypt(string strText) 
            {
                string outString = "";
                byte[] byKey = null; 
                byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
                byte[] inputByteArray = new Byte[strText.Length]; 
                try 
                {
                    byKey = System.Text.Encoding.UTF8.GetBytes(decryptKey.Substring(0, decryptKey.Length)); 
                    DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                    inputByteArray = Convert.FromBase64String(strText); 
                    MemoryStream ms = new MemoryStream(); 
                    CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); 
                    cs.Write(inputByteArray, 0, inputByteArray.Length); 
                    cs.FlushFinalBlock(); 
                    System.Text.Encoding encoding = new System.Text.UTF8Encoding(); 
                    outString = encoding.GetString(ms.ToArray()); 
                } 
                catch(System.Exception) 
                {
                    outString = ""; 
                }            return outString;
            }         #endregion    }