#region DES对称加密解密   public const string DEFAULT_ENCRYPT_KEY = "12345678";        /// <summary>        /// 使用默认加密        /// </summary>        /// <param name="strText"></param>        /// <returns></returns>        public static string DesEncrypt(string strText)        {            try            {                return DesEncrypt(strText, DEFAULT_ENCRYPT_KEY);            }            catch            {                return "";            }        }        /// <summary>        /// 使用默认解密        /// </summary>        /// <param name="strText"></param>        /// <returns></returns>        public static string DesDecrypt(string strText)        {            try            {                return DesDecrypt(strText, DEFAULT_ENCRYPT_KEY);            }            catch            {                return "";            }        }        /// <summary>         /// Encrypt the string         /// Attention:key must be 8 bits         /// </summary>         /// <param name="strText">string</param>         /// <param name="strEncrKey">key</param>         /// <returns></returns>         public static string DesEncrypt(string strText, string strEncrKey)        {            byte[] byKey = null;            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));            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();            return Convert.ToBase64String(ms.ToArray());        }        /// <summary>         /// Decrypt string         /// Attention:key must be 8 bits         /// </summary>         /// <param name="strText">Decrypt string</param>         /// <param name="sDecrKey">key</param>         /// <returns>output string</returns>         public static string DesDecrypt(string strText, string sDecrKey)        {            byte[] byKey = null;            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            byte[] inputByteArray = new Byte[strText.Length];            byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));            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();            Encoding encoding = new UTF8Encoding();            return encoding.GetString(ms.ToArray());        }        /// <summary>         /// Encrypt files         /// Attention:key must be 8 bits         /// </summary>         /// <param name="m_InFilePath">Encrypt file path</param>         /// <param name="m_OutFilePath">output file</param>         /// <param name="strEncrKey">key</param>         public static void DesEncrypt(string m_InFilePath, string m_OutFilePath, string strEncrKey)        {            byte[] byKey = null;            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));            FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);            FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);            fout.SetLength(0);            //Create variables to help with read and write.             byte[] bin = new byte[100]; //This is intermediate storage for the encryption.             long rdlen = 0; //This is the total number of bytes written.             long totlen = fin.Length; //This is the total length of the input file.             int len; //This is the number of bytes to be written at a time.             DES des = new DESCryptoServiceProvider();            CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);            //Read from the input file, then encrypt and write to the output file.             while (rdlen < totlen)            {                len = fin.Read(bin, 0, 100);                encStream.Write(bin, 0, len);                rdlen = rdlen + len;            }            encStream.Close();            fout.Close();            fin.Close();        }        /// <summary>         /// Decrypt files         /// Attention:key must be 8 bits         /// </summary>         /// <param name="m_InFilePath">Decrypt filepath</param>         /// <param name="m_OutFilePath">output filepath</param>         /// <param name="sDecrKey">key</param>         public static void DesDecrypt(string m_InFilePath, string m_OutFilePath, string sDecrKey)        {            byte[] byKey = null;            byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };            byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));            FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);            FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);            fout.SetLength(0);            //Create variables to help with read and write.             byte[] bin = new byte[100]; //This is intermediate storage for the encryption.             long rdlen = 0; //This is the total number of bytes written.             long totlen = fin.Length; //This is the total length of the input file.             int len; //This is the number of bytes to be written at a time.             DES des = new DESCryptoServiceProvider();            CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);            //Read from the input file, then encrypt and write to the output file.             while (rdlen < totlen)            {                len = fin.Read(bin, 0, 100);                encStream.Write(bin, 0, len);                rdlen = rdlen + len;            }            encStream.Close();            fout.Close();            fin.Close();        }         #endregion

#region 对称加密算法AES RijndaelManaged加密解密
private static readonly string Default_AES_Key = "@#kim123";        private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79,                                             0x53,0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };        /// <summary>        /// 对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法)        /// </summary>        /// <param name="encryptString">待加密字符串</param>        /// <returns>加密结果字符串</returns>        public static string AES_Encrypt(string encryptString)        {            return AES_Encrypt(encryptString, Default_AES_Key);        }        /// <summary>        /// 对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法)        /// </summary>        /// <param name="encryptString">待加密字符串</param>        /// <param name="encryptKey">加密密钥，须半角字符</param>        /// <returns>加密结果字符串</returns>        public static string AES_Encrypt(string encryptString, string encryptKey)        {            encryptKey = GetSubString(encryptKey, 32, "");            encryptKey = encryptKey.PadRight(32, ‘ ‘);            RijndaelManaged rijndaelProvider = new RijndaelManaged();            rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));            rijndaelProvider.IV = Keys;            ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();            byte[] inputData =http://www.mamicode.com/ Encoding.UTF8.GetBytes(encryptString);            byte[] encryptedData = http://www.mamicode.com/rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);            return Convert.ToBase64String(encryptedData);        }        /// <summary>        /// 对称加密算法AES RijndaelManaged解密字符串        /// </summary>        /// <param name="decryptString">待解密的字符串</param>        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>        public static string AES_Decrypt(string decryptString)        {            return AES_Decrypt(decryptString, Default_AES_Key);        }        /// <summary>        /// 对称加密算法AES RijndaelManaged解密字符串        /// </summary>        /// <param name="decryptString">待解密的字符串</param>        /// <param name="decryptKey">解密密钥,和加密密钥相同</param>        /// <returns>解密成功返回解密后的字符串,失败返回空</returns>        public static string AES_Decrypt(string decryptString, string decryptKey)        {            try            {                decryptKey = GetSubString(decryptKey, 32, "");                decryptKey = decryptKey.PadRight(32, ‘ ‘);                RijndaelManaged rijndaelProvider = new RijndaelManaged();                rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);                rijndaelProvider.IV = Keys;                ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();                byte[] inputData =http://www.mamicode.com/ Convert.FromBase64String(decryptString);                byte[] decryptedData = http://www.mamicode.com/rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);                return Encoding.UTF8.GetString(decryptedData);            }            catch            {                return string.Empty;            }        }        /// <summary>        /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分        /// </summary>        /// <param name="sourceString">源字符串</param>        /// <param name="length">所取字符串字节长度</param>        /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param>        /// <returns>某字符串的一部分</returns>        private static string GetSubString(string sourceString, int length, string tailString)        {            return GetSubString(sourceString, 0, length, tailString);        }        /// <summary>        /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分        /// </summary>        /// <param name="sourceString">源字符串</param>        /// <param name="startIndex">索引位置，以0开始</param>        /// <param name="length">所取字符串字节长度</param>        /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param>        /// <returns>某字符串的一部分</returns>        private static string GetSubString(string sourceString, int startIndex, int length, string tailString)        {            string myResult = sourceString;            //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3)            if (System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\u0800-\u4e00]+") ||                System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\xAC00-\xD7A3]+"))            {                //当截取的起始位置超出字段串长度时                if (startIndex >= sourceString.Length)                {                    return string.Empty;                }                else                {                    return sourceString.Substring(startIndex,                                                   ((length + startIndex) > sourceString.Length) ? (sourceString.Length - startIndex) : length);                }            }            //中文字符，如"中国人民abcd123"            if (length <= 0)            {                return string.Empty;            }            byte[] bytesSource = Encoding.Default.GetBytes(sourceString);            //当字符串长度大于起始位置            if (bytesSource.Length > startIndex)            {                int endIndex = bytesSource.Length;                //当要截取的长度在字符串的有效长度范围内                if (bytesSource.Length > (startIndex + length))                {                    endIndex = length + startIndex;                }                else                {   //当不在有效范围内时,只取到字符串的结尾                    length = bytesSource.Length - startIndex;                    tailString = "";                }                int[] anResultFlag = new int[length];                int nFlag = 0;                //字节大于127为双字节字符                for (int i = startIndex; i < endIndex; i++)                {                    if (bytesSource[i] > 127)                    {                        nFlag++;                        if (nFlag == 3)                        {                            nFlag = 1;                        }                    }                    else                    {                        nFlag = 0;                    }                    anResultFlag[i] = nFlag;                }                //最后一个字节为双字节字符的一半                if ((bytesSource[endIndex - 1] > 127) && (anResultFlag[length - 1] == 1))                {                    length = length + 1;                }                byte[] bsResult = new byte[length];                Array.Copy(bytesSource, startIndex, bsResult, 0, length);                myResult = Encoding.Default.GetString(bsResult);                myResult = myResult + tailString;                return myResult;            }            return string.Empty;        }        /// <summary>        /// 加密文件流        /// </summary>        /// <param name="fs"></param>        /// <returns></returns>        public static CryptoStream AES_EncryptStrream(FileStream fs, string decryptKey)        {            decryptKey = GetSubString(decryptKey, 32, "");            decryptKey = decryptKey.PadRight(32, ‘ ‘);            RijndaelManaged rijndaelProvider = new RijndaelManaged();            rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);            rijndaelProvider.IV = Keys;            ICryptoTransform encrypto = rijndaelProvider.CreateEncryptor();            CryptoStream cytptostreamEncr = new CryptoStream(fs, encrypto, CryptoStreamMode.Write);            return cytptostreamEncr;        }        /// <summary>        /// 解密文件流        /// </summary>        /// <param name="fs"></param>        /// <returns></returns>        public static CryptoStream AES_DecryptStream(FileStream fs, string decryptKey)        {            decryptKey = GetSubString(decryptKey, 32, "");            decryptKey = decryptKey.PadRight(32, ‘ ‘);            RijndaelManaged rijndaelProvider = new RijndaelManaged();            rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);            rijndaelProvider.IV = Keys;            ICryptoTransform Decrypto = rijndaelProvider.CreateDecryptor();            CryptoStream cytptostreamDecr = new CryptoStream(fs, Decrypto, CryptoStreamMode.Read);            return cytptostreamDecr;        }        /// <summary>        /// 对指定文件加密        /// </summary>        /// <param name="InputFile"></param>        /// <param name="OutputFile"></param>        /// <returns></returns>        public static bool AES_EncryptFile(string InputFile, string OutputFile)        {            try            {                string decryptKey = "www.iqidi.com";                FileStream fr = new FileStream(InputFile, FileMode.Open);                FileStream fren = new FileStream(OutputFile, FileMode.Create);                CryptoStream Enfr = AES_EncryptStrream(fren, decryptKey);                byte[] bytearrayinput = new byte[fr.Length];                fr.Read(bytearrayinput, 0, bytearrayinput.Length);                Enfr.Write(bytearrayinput, 0, bytearrayinput.Length);                Enfr.Close();                fr.Close();                fren.Close();            }            catch            {                //文件异常                return false;            }            return true;        }        /// <summary>        /// 对指定的文件解压缩        /// </summary>        /// <param name="InputFile"></param>        /// <param name="OutputFile"></param>        /// <returns></returns>        public static bool AES_DecryptFile(string InputFile, string OutputFile)        {            try            {                string decryptKey = "www.iqidi.com";                FileStream fr = new FileStream(InputFile, FileMode.Open);                FileStream frde = new FileStream(OutputFile, FileMode.Create);                CryptoStream Defr = AES_DecryptStream(fr, decryptKey);                byte[] bytearrayoutput = new byte[1024];                int m_count = 0;                do                {                    m_count = Defr.Read(bytearrayoutput, 0, bytearrayoutput.Length);                    frde.Write(bytearrayoutput, 0, m_count);                    if (m_count < bytearrayoutput.Length)                        break;                } while (true);                Defr.Close();                fr.Close();                frde.Close();            }            catch            {                //文件异常                return false;            }            return true;        }                #endregion

 #region Base64加密解密/// <summary>        /// Base64是一種使用64基的位置計數法。它使用2的最大次方來代表僅可列印的ASCII 字元。        /// 這使它可用來作為電子郵件的傳輸編碼。在Base64中的變數使用字元A-Z、a-z和0-9 ，        /// 這樣共有62個字元，用來作為開始的64個數字，最後兩個用來作為數字的符號在不同的        /// 系統中而不同。        /// Base64加密        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static string Base64Encrypt(string str)        {            byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str);            return Convert.ToBase64String(encbuff);        }        /// <summary>        /// Base64解密        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        public static string Base64Decrypt(string str)        {            byte[] decbuff = Convert.FromBase64String(str);            return System.Text.Encoding.UTF8.GetString(decbuff);        }         #endregion

/// 获得32位的MD5加密        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string GetMD5_32(string input)        {            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();            byte[] data =http://www.mamicode.com/ md5.ComputeHash(System.Text.Encoding.Default.GetBytes(input));            StringBuilder sb = new StringBuilder();            for (int i = 0; i < data.Length; i++)            {                sb.Append(data[i].ToString("x2"));            }            return sb.ToString();        }        /// <summary>        /// 获得16位的MD5加密        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string GetMD5_16(string input)        {            return GetMD5_32(input).Substring(8, 16);        }        /// <summary>        /// 获得8位的MD5加密        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string GetMD5_8(string input)        {            return GetMD5_32(input).Substring(8, 8);        }        /// <summary>        /// 获得4位的MD5加密        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string GetMD5_4(string input)        {            return GetMD5_32(input).Substring(8, 4);        }        public static string MD5EncryptHash(String input)        {            MD5 md5 = new MD5CryptoServiceProvider();            //the GetBytes method returns byte array equavalent of a string            byte[] res = md5.ComputeHash(Encoding.Default.GetBytes(input), 0, input.Length);            char[] temp = new char[res.Length];            //copy to a char array which can be passed to a String constructor            Array.Copy(res, temp, res.Length);            //return the result as a string            return new String(temp);        }

  #region MD5签名验证/// <summary>        /// 对给定文件路径的文件加上标签        /// </summary>        /// <param name="path">要加密的文件的路径</param>        /// <returns>标签的值</returns>        public static bool AddMD5(string path)        {            bool IsNeed = true;            if (CheckMD5(path))                                  //已进行MD5处理                IsNeed = false;            try            {                FileStream fsread = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);                byte[] md5File = new byte[fsread.Length];                fsread.Read(md5File, 0, (int)fsread.Length);                               // 将文件流读取到Buffer中                fsread.Close();                if (IsNeed)                {                    string result = MD5Buffer(md5File, 0, md5File.Length);             // 对Buffer中的字节内容算MD5                    byte[] md5 = System.Text.Encoding.ASCII.GetBytes(result);       // 将字符串转换成字节数组以便写人到文件中                    FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);                    fsWrite.Write(md5File, 0, md5File.Length);                               // 将文件，MD5值 重新写入到文件中。                    fsWrite.Write(md5, 0, md5.Length);                    fsWrite.Close();                }                else                {                    FileStream fsWrite = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);                    fsWrite.Write(md5File, 0, md5File.Length);                    fsWrite.Close();                }            }            catch            {                return false;            }            return true;        }        /// <summary>        /// 对给定路径的文件进行验证        /// </summary>        /// <param name="path"></param>        /// <returns>是否加了标签或是否标签值与内容值一致</returns>        public static bool CheckMD5(string path)        {            try            {                FileStream get_file = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);                byte[] md5File = new byte[get_file.Length];                                      // 读入文件                get_file.Read(md5File, 0, (int)get_file.Length);                get_file.Close();                string result = MD5Buffer(md5File, 0, md5File.Length - 32);             // 对文件除最后32位以外的字节计算MD5，这个32是因为标签位为32位。                string md5 = System.Text.Encoding.ASCII.GetString(md5File, md5File.Length - 32, 32);   //读取文件最后32位，其中保存的就是MD5值                return result == md5;            }            catch            {                return false;            }        }        /// <summary>        /// 计算文件的MD5值        /// </summary>        /// <param name="MD5File">MD5签名文件字符数组</param>        /// <param name="index">计算起始位置</param>        /// <param name="count">计算终止位置</param>        /// <returns>计算结果</returns>        private static string MD5Buffer(byte[] MD5File, int index, int count)        {            System.Security.Cryptography.MD5CryptoServiceProvider get_md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();            byte[] hash_byte = get_md5.ComputeHash(MD5File, index, count);            string result = System.BitConverter.ToString(hash_byte);            result = result.Replace("-", "");            return result;        }  #endregion

/// SHA256函数        /// </summary>        /// <param name="str">原始字符串</param>        /// <returns>SHA256结果(返回长度为44字节的字符串)</returns>        public static string SHA256(string str)        {            byte[] SHA256Data =http://www.mamicode.com/ Encoding.UTF8.GetBytes(str);            SHA256Managed Sha256 = new SHA256Managed();            byte[] Result = Sha256.ComputeHash(SHA256Data);            return Convert.ToBase64String(Result);  //返回长度为44字节的字符串        }

/// 加密字符串        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string EncryptString(string input)        {            return MD5Util.AddMD5Profix(Base64Util.Encrypt(MD5Util.AddMD5Profix(input)));            //return Base64.Encrypt(MD5.AddMD5Profix(Base64.Encrypt(input)));        }        /// <summary>        /// 解密加过密的字符串        /// </summary>        /// <param name="input"></param>        /// <param name="throwException">解密失败是否抛异常</param>        /// <returns></returns>        public static string DecryptString(string input, bool throwException)        {            string res = "";            try            {                res = input;// Base64.Decrypt(input);                if (MD5Util.ValidateValue(res))                {                    return MD5Util.RemoveMD5Profix(Base64Util.Decrypt(MD5Util.RemoveMD5Profix(res)));                }                else                {                    throw new Exception("字符串无法转换成功！");                }            }            catch            {                if (throwException)                {                    throw;                }                else                {                    return "";                }            }        }//-----------下面是MD5Util下面的函数        /// <summary>        /// 添加MD5的前缀，便于检查有无篡改        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string AddMD5Profix(string input)        {            return GetMD5_4(input) + input;        }        /// <summary>        /// 移除MD5的前缀        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string RemoveMD5Profix(string input)        {            return input.Substring(4);        }        /// <summary>        /// 验证MD5前缀处理的字符串有无被篡改        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static bool ValidateValue(string input)        {            bool res = false;            if (input.Length >= 4)            {                string tmp = input.Substring(4);                if (input.Substring(0, 4) == GetMD5_4(tmp))                {                    res = true;                }            }            return res;        }

/// <summary>    /// 基于Base64的加密编码，    /// 可以设置不同的密码表来获取不同的编码合解码    /// </summary>    public class Base64Util    {        public Base64Util()        {            this.InitDict();        }        protected static Base64Util s_b64 = new Base64Util();        /// <summary>        /// 使用默认的密码表加密字符串        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string Encrypt(string input)        {            return s_b64.Encode(input);        }        /// <summary>        /// 使用默认的密码表解密字符串        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static string Decrypt(string input)        {            return s_b64.Decode(input);        }        /// <summary>        /// 获取具有标准的Base64密码表的加密类        /// </summary>        /// <returns></returns>        public static Base64Util GetStandardBase64()        {            Base64Util b64 = new Base64Util();            b64.Pad = "=";            b64.CodeTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";            return b64;        }        protected string m_codeTable = @"ABCDEFGHIJKLMNOPQRSTUVWXYZbacdefghijklmnopqrstu_wxyz0123456789*-";        protected string m_pad = "v";        protected Dictionary<int, char> m_t1 = new Dictionary<int, char>();        protected Dictionary<char, int> m_t2 = new Dictionary<char, int>();        /// <summary>        /// 密码表        /// </summary>        public string CodeTable        {            get { return m_codeTable; }            set            {                if (value =http://www.mamicode.com/= null)                {                    throw new Exception("密码表不能为null");                }                else if (value.Length < 64)                {                    throw new Exception("密码表长度必须至少为64");                }                else                {                    this.ValidateRepeat(value);                    this.ValidateEqualPad(value, m_pad);                    m_codeTable = value;                    this.InitDict();                }            }        }        /// <summary>        /// 补码        /// </summary>        public string Pad        {            get { return m_pad; }            set            {                if (value =http://www.mamicode.com/= null)                {                    throw new Exception("密码表的补码不能为null");                }                else if (value.Length != 1)                {                    throw new Exception("密码表的补码长度必须为1");                }                else                {                    this.ValidateEqualPad(m_codeTable, value);                    m_pad = value;                    this.InitDict();                }            }        }        /// <summary>        /// 返回编码后的字符串        /// </summary>        /// <param name="source"></param>        /// <returns></returns>        public string Encode(string source)        {            if (source == null || source == "")            {                return "";            }            else            {                StringBuilder sb = new StringBuilder();                byte[] tmp = System.Text.UTF8Encoding.UTF8.GetBytes(source);                int remain = tmp.Length % 3;                int patch = 3 - remain;                if (remain != 0)                {                    Array.Resize(ref tmp, tmp.Length + patch);                }                int cnt = (int)Math.Ceiling(tmp.Length * 1.0 / 3);                for (int i = 0; i < cnt; i++)                {                    sb.Append(this.EncodeUnit(tmp[i * 3], tmp[i * 3 + 1], tmp[i * 3 + 2]));                }                if (remain != 0)                {                    sb.Remove(sb.Length - patch, patch);                    for (int i = 0; i < patch; i++)                    {                        sb.Append(m_pad);                    }                }                return sb.ToString();            }        }        protected string EncodeUnit(params byte[] unit)        {            int[] obj = new int[4];            obj[0] = (unit[0] & 0xfc) >> 2;            obj[1] = ((unit[0] & 0x03) << 4) + ((unit[1] & 0xf0) >> 4);            obj[2] = ((unit[1] & 0x0f) << 2) + ((unit[2] & 0xc0) >> 6);            obj[3] = unit[2] & 0x3f;            StringBuilder sb = new StringBuilder();            for (int i = 0; i < obj.Length; i++)            {                sb.Append(this.GetEC((int)obj[i]));            }            return sb.ToString();        }        protected char GetEC(int code)        {            return m_t1[code];//m_codeTable[code];        }        /// <summary>        /// 获得解码字符串        /// </summary>        /// <param name="source"></param>        /// <returns></returns>        public string Decode(string source)        {            if (source == null || source == "")            {                return "";            }            else            {                List<byte> list = new List<byte>();                char[] tmp = source.ToCharArray();                int remain = tmp.Length % 4;                if (remain != 0)                {                    Array.Resize(ref tmp, tmp.Length - remain);                }                int patch = source.IndexOf(m_pad);                if (patch != -1)                {                    patch = source.Length - patch;                }                int cnt = tmp.Length / 4;                for (int i = 0; i < cnt; i++)                {                    this.DecodeUnit(list, tmp[i * 4], tmp[i * 4 + 1], tmp[i * 4 + 2], tmp[i * 4 + 3]);                }                for (int i = 0; i < patch; i++)                {                    list.RemoveAt(list.Count - 1);                }                return System.Text.Encoding.UTF8.GetString(list.ToArray());            }        }        protected void DecodeUnit(List<byte> byteArr, params char[] chArray)        {            int[] res = new int[3];            byte[] unit = new byte[chArray.Length];            for (int i = 0; i < chArray.Length; i++)            {                unit[i] = this.FindChar(chArray[i]);            }            res[0] = (unit[0] << 2) + ((unit[1] & 0x30) >> 4);            res[1] = ((unit[1] & 0xf) << 4) + ((unit[2] & 0x3c) >> 2);            res[2] = ((unit[2] & 0x3) << 6) + unit[3];            for (int i = 0; i < res.Length; i++)            {                byteArr.Add((byte)res[i]);            }        }        protected byte FindChar(char ch)        {            int pos = m_t2[ch];//m_codeTable.IndexOf(ch);            return (byte)pos;        }        /// <summary>        /// 初始化双向哈西字典        /// </summary>        protected void InitDict()        {            m_t1.Clear();            m_t2.Clear();            m_t2.Add(m_pad[0], -1);            for (int i = 0; i < m_codeTable.Length; i++)            {                m_t1.Add(i, m_codeTable[i]);                m_t2.Add(m_codeTable[i], i);            }        }        /// <summary>        /// 检查字符串中的字符是否有重复        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        protected void ValidateRepeat(string input)        {            for (int i = 0; i < input.Length; i++)            {                if (input.LastIndexOf(input[i]) > i)                {                    throw new Exception("密码表中含有重复字符：" + input[i]);                }            }        }        /// <summary>        /// 检查字符串是否包含补码字符        /// </summary>        /// <param name="input"></param>        /// <param name="pad"></param>        protected void ValidateEqualPad(string input, string pad)        {            if (input.IndexOf(pad) > -1)            {                throw new Exception("密码表中包含了补码字符：" + pad);            }        }    }

 public class MyEncrypt    {        public string Key2;        public string Key1;        public string defultKey1 = "fHezg0ouyQ4=";        public string defultKey2 = "gSIoPdlJGgY=";        public string EncryptDate(string Date)        {            byte[] keyBytes = Convert.FromBase64String(Key1);            byte[] keyIV = Convert.FromBase64String(Key2);            byte[] inputByteArray = Encoding.UTF8.GetBytes(Date);            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();            MemoryStream mStream = new MemoryStream();            CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);            cStream.Write(inputByteArray, 0, inputByteArray.Length);            cStream.FlushFinalBlock();            return Convert.ToBase64String(mStream.ToArray());        }        public static string EncryptDate(string Date, string Key1, string Key2)        {            MyEncrypt encrypt = new MyEncrypt();            encrypt.Key1 = Key1;            encrypt.Key2 = Key2;            return encrypt.EncryptDate(Date + getMd5Hash(getMac() + DateTime.Now.ToFileTime()));        }        static string getMd5Hash(string input)        {            MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();            // 输入的字符串转换为字节数组，并计算哈希值。            byte[] data =http://www.mamicode.com/ md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(input));            // 创建一个新的StringBuilder收集字节            // and create a string.            StringBuilder sBuilder = new StringBuilder();            // 遍历每个字节的散列数据            // 每一个格式化为十六进制字符串            for (int i = 0; i < data.Length; i++)            {                sBuilder.Append(data[i].ToString("x2"));            }            // 返回的十六进制字符串。            return sBuilder.ToString();        }        private static string getMac()        {            string mac = "";            Random r = new Random();            mac = System.DateTime.Now.ToFileTime().ToString() + r.Next().ToString();            return mac;        }    } 

 /// <summary>        /// AES 加密        /// </summary>        /// <param name="toEncrypt">加密的字符串</param>        /// <param name="key">算法密匙</param>        /// <param name="iv">对称算法初始化向量</param>        /// <returns></returns>        public static string Encrypt(string toEncrypt, string key, string iv)        {            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(iv);            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.IV = ivArray;            rDel.Mode = CipherMode.CBC;            rDel.Padding = PaddingMode.Zeros;            ICryptoTransform cTransform = rDel.CreateEncryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);            return Convert.ToBase64String(resultArray, 0, resultArray.Length);        }        /// <summary>        /// AES 解密        /// </summary>        /// <param name="toDecrypt">解密的字符串</param>        /// <param name="key">算法密匙</param>        /// <param name="iv">对称算法初始化向量</param>        /// <returns></returns>        public static string Decrypt(string toDecrypt, string key, string iv)        {            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(iv);            byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.IV = ivArray;            rDel.Mode = CipherMode.CBC;            rDel.Padding = PaddingMode.Zeros;            ICryptoTransform cTransform = rDel.CreateDecryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);            return UTF8Encoding.UTF8.GetString(resultArray);        }