public static string DecryptString(String cipherText, string Key)
        {
            byte[] tmpCipherText = Convert.FromBase64String(cipherText);
            byte[] tmpKey = GenerateAlgotihmInputs(Key);

            using (RijndaelManaged alg = new RijndaelManaged())
            {
                alg.Key = tmpKey;
                alg.IV = tmpKey;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = alg.CreateDecryptor(alg.Key, alg.IV);

                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(tmpCipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        // Place les données déchiffrées dans un tableau d'octet
                        byte[] plainTextData = new byte[tmpCipherText.Length];

                        int decryptedByteCount = csDecrypt.Read(plainTextData, 0, plainTextData.Length);
                        return Encoding.UTF8.GetString(plainTextData, 0, decryptedByteCount);
                    }

                }

            }
        }

        public byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
        {
            byte[] encryptedBytes = null;

            // Set your salt here, change it to meet your flavor:
            // The salt bytes must be at least 8 bytes.
            byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };

            using (MemoryStream ms = new MemoryStream())
            {
                using (RijndaelManaged AES = new RijndaelManaged())
                {
                    AES.KeySize = 256;
                    AES.BlockSize = 128;

                    var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                    AES.Key = key.GetBytes(AES.KeySize / 8);
                    AES.IV = key.GetBytes(AES.BlockSize / 8);

                    AES.Mode = CipherMode.CBC;

                    using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                        cs.Close();
                    }
                    encryptedBytes = ms.ToArray();
                }
            }

            return encryptedBytes;
        }

        public static void DecryptFile(string strKey, string pathCypheredTextFile, string pathPlainTextFile)
        {
            // Place la clé de déchiffrement dans un tableau d'octets
            byte[] key = GenerateAlgotihmInputs(strKey);

            // Place le vecteur d'initialisation dans un tableau d'octets
            byte[] iv = GenerateAlgotihmInputs(strKey);

            // Filestream of the new file that will be decrypted.
            Directory.CreateDirectory(Directory.GetParent(pathPlainTextFile).FullName);
            FileStream fsCrypt = new FileStream(pathPlainTextFile, FileMode.Create);

            RijndaelManaged rijndael = new RijndaelManaged();
            rijndael.Mode = CipherMode.CBC;
            rijndael.Key = key;
            rijndael.IV = iv;

            ICryptoTransform aesDecryptor = rijndael.CreateDecryptor();

            CryptoStream cs = new CryptoStream(fsCrypt, aesDecryptor, CryptoStreamMode.Write);

            // FileStream of the file that is currently encrypted.
            FileStream fsIn = new FileStream(pathCypheredTextFile, FileMode.OpenOrCreate);

            int data;

            while ((data = fsIn.ReadByte()) != -1)
                cs.WriteByte((byte)data);
            cs.Close();
            fsIn.Close();
            fsCrypt.Close();
        }

 public static string Encrypt(string plainText, string passPhrase)
 {
     byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
     using (PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null))
     {
         byte[] keyBytes = password.GetBytes(keysize / 8);
         using (RijndaelManaged symmetricKey = new RijndaelManaged())
         {
             symmetricKey.Mode = CipherMode.CBC;
             using (ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes))
             {
                 using (MemoryStream memoryStream = new MemoryStream())
                 {
                     using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
                     {
                         cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
                         cryptoStream.FlushFinalBlock();
                         byte[] cipherTextBytes = memoryStream.ToArray();
                         return Convert.ToBase64String(cipherTextBytes);
                     }
                 }
             }
         }
     }
 }

        private static readonly byte[] Iv = System.Text.Encoding.ASCII.GetBytes("E&naQSWy$QPY9K0d");                      // 16 chars - 128 bit vector

        private static byte[] StringToBytes_Aes(string plainText)
        {
            // Check arguments. 
            Require.NotNullOrEmpty(plainText, "plainText");

            // Create an AES (aka Rijndael) algorithm object 
            byte[] encryptedBytes;
            using (var aesAlgorithm = Aes.Create())
            {
                // Create a encryptor with the specified Key and Iv
                // to perform the stream transform.
                aesAlgorithm.Key = Key;
                aesAlgorithm.IV = Iv;
                using (var encryptor = aesAlgorithm.CreateEncryptor(aesAlgorithm.Key, aesAlgorithm.IV))
                {
                    // Create the streams used for encryption.
                    using (var encryptionStream = new MemoryStream())
                    {
                        using (var cryptoStream = new CryptoStream(encryptionStream, encryptor, CryptoStreamMode.Write))
                        {
                            using (var encryptionStreamWriter = new StreamWriter(cryptoStream))
                            {
                                // Write all data to the stream.
                                encryptionStreamWriter.Write(plainText);
                            }
                            encryptedBytes = encryptionStream.ToArray();

                        }
                    }
                }
            }

            // Return the encrypted bytes from the memory stream. 
            return encryptedBytes;
        }

 public AesStream(Socket socket, EnhancedStream stream, byte[] key)
     : base(socket)
 {
     BaseStream = stream;
     _enc = new CryptoStream(stream, GenerateAES(key).CreateEncryptor(), CryptoStreamMode.Write);
     _dec = new CryptoStream(stream, GenerateAES(key).CreateDecryptor(), CryptoStreamMode.Read);
 }

        public static string Descriptografar(string codigo)
        {
            try
            {
                if (string.IsNullOrEmpty(codigo))
                    return String.Empty;
                string retorno;
                var chave = new Rfc2898DeriveBytes(Segredo, Complemento);

                var algoritimo = new RijndaelManaged();
                algoritimo.Key = chave.GetBytes(algoritimo.KeySize / 8);
                algoritimo.IV = chave.GetBytes(algoritimo.BlockSize / 8);

                var descriptografor = algoritimo.CreateDecryptor(algoritimo.Key, algoritimo.IV);
                var bytes = Convert.FromBase64String(codigo);

                using (var memoryStream = new MemoryStream(bytes))
                using (var cryptoStream = new CryptoStream(memoryStream, descriptografor, CryptoStreamMode.Read))
                using (var streamReader = new StreamReader(cryptoStream))
                    retorno = streamReader.ReadToEnd();

                algoritimo.Clear();

                return retorno;
            }
            catch (Exception)
            {
                return "DEU PAU";
            }
        }

        public static string Criptografar(string texto)
        {
            if(string.IsNullOrEmpty(texto))
                return String.Empty;

            string outStr;

            RijndaelManaged aesAlg = null;
            try
            {
                var key = new Rfc2898DeriveBytes(Segredo, Complemento);
                aesAlg = new RijndaelManaged();
                aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
                aesAlg.IV = key.GetBytes(aesAlg.BlockSize / 8);
                var encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
                using (var msEncrypt = new MemoryStream())
                {
                    using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                    {
                        using (var swEncrypt = new StreamWriter(csEncrypt))
                        {
                            swEncrypt.Write(texto);
                        }
                    }
                    outStr = Convert.ToBase64String(msEncrypt.ToArray());
                }
            }
            finally
            {
                if (aesAlg != null)
                    aesAlg.Clear();
            }
            return outStr;
        }

        public static string EncryptString(
            string plainText,
            string passPhrase,
            string saltValue,
            int passwordIterations,
            string initVector,
            int keySize)
        {

            byte[] initVectorBytes = initVector == null ? new byte[16] : Encoding.ASCII.GetBytes(initVector);
            byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
            byte[] keyBytes = GetKeyBytes(passPhrase, saltValue, passwordIterations, keySize);
            RijndaelManaged symmetricKey = new RijndaelManaged();
            symmetricKey.Mode = CipherMode.CBC;
            ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
            byte[] cipherTextBytes;
            using (MemoryStream memoryStream = new MemoryStream())
            {
                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
                {
                    cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
                    cryptoStream.FlushFinalBlock();
                    cipherTextBytes = memoryStream.ToArray();
                }
            }
            string cipherText = Convert.ToBase64String(cipherTextBytes);
            return cipherText;
        }

        public static string Decrypt(string sourceData)
        {
            // set key and initialization vector values
              byte[] key = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
              byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
              try
              {
            // convert data to byte array
            byte[] encryptedDataBytes =
               Convert.FromBase64String(sourceData);

            // get source memory stream and fill it
            MemoryStream tempStream =
               new MemoryStream(encryptedDataBytes, 0,
              encryptedDataBytes.Length);

            // get decryptor and decryption stream
            DESCryptoServiceProvider decryptor =
               new DESCryptoServiceProvider();
            CryptoStream decryptionStream =
               new CryptoStream(tempStream,
              decryptor.CreateDecryptor(key, iv),
              CryptoStreamMode.Read);

            // decrypt data
            StreamReader allDataReader =
               new StreamReader(decryptionStream);
            return allDataReader.ReadToEnd();
              }
              catch
              {
            throw new StringEncryptorException(
               "Unable to decrypt data.");
              }
        }

        public static string Encode(string str, string key)
        {
            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();

            provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));

            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));

            byte[] bytes = Encoding.UTF8.GetBytes(str);

            MemoryStream stream = new MemoryStream();

            CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);

            stream2.Write(bytes, 0, bytes.Length);

            stream2.FlushFinalBlock();

            StringBuilder builder = new StringBuilder();

            foreach (byte num in stream.ToArray())
            {

                builder.AppendFormat("{0:X2}", num);

            }

            stream.Close();

            return builder.ToString();
        }

        public byte[] Encrypt(byte[] block)
        {
            ICryptoTransform enc = null;
            Aes.Mode = CipherMode.CBC;
            Aes.Key = key;
            Aes.GenerateIV();
            Console.WriteLine("Key: {0} IV: {1}", CNetwork.ByteArrayToString(Aes.Key), CNetwork.ByteArrayToString(Aes.IV));

            CryptoStream cstream = null;
            MemoryStream mem = null;
            byte[] toEncrypt = null;

            try
            {
                cstream = null;
                mem = new MemoryStream();
                toEncrypt = block;
                enc = Aes.CreateEncryptor();
                cstream = new CryptoStream(mem, enc, CryptoStreamMode.Write);
                cstream.Write(toEncrypt, 0, toEncrypt.Length);
            }
            finally
            {
                if (cstream != null)
                    Aes.Clear();
                cstream.Close();
            }

            Console.WriteLine(CNetwork.ByteArrayToString(mem.ToArray()));

            return mem.ToArray();
        }

        public static string Encrypt( string strEncryptString, string strEncryptionKey)
        {
            byte[] inputByteArray;

            try
            {
                key = Encoding.UTF8.GetBytes(strEncryptionKey.Substring(0, 8));

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Encoding.UTF8.GetBytes(strEncryptString);

                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write);

                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();

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

                throw eX;
            }
        }

        public static string EncryptString(string plainText)
        {
            byte[] encrypted;

            AesCryptoServiceProvider provider = createAesProvider();

            // Create a decrytor to perform the stream transform.
            ICryptoTransform encryptor = provider.CreateEncryptor(provider.Key, null); // null IV, because ECB mode

            // Create the streams used for encryption.
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        //Write all data to the stream.
                        swEncrypt.Write(plainText);
                    }
                    encrypted = msEncrypt.ToArray();
                }
            }
            // Return the encrypted bytes from the memory stream.
            return encoding.GetString(encrypted);
        }

        /// <summary>
        /// AES解密(无向量)
        /// </summary>
        /// <param name="encryptedBytes">被加密的明文</param>
        /// <param name="key">密钥</param>
        /// <returns>明文</returns>
        public static string AESDecryptWithoutVector(String Data, String Key)
        {
            Byte[] encryptedBytes = Convert.FromBase64String(Data);
            Byte[] bKey = new Byte[32];
            Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length);

            MemoryStream mStream = new MemoryStream(encryptedBytes);
            //mStream.Write( encryptedBytes, 0, encryptedBytes.Length );
            //mStream.Seek( 0, SeekOrigin.Begin );
            RijndaelManaged aes = new RijndaelManaged();
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;
            aes.KeySize = 128;
            aes.Key = bKey;
            //aes.IV = _iV;
            CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
            try
            {
                byte[] tmp = new byte[encryptedBytes.Length + 32];
                int len = cryptoStream.Read(tmp, 0, encryptedBytes.Length + 32);
                byte[] ret = new byte[len];
                Array.Copy(tmp, 0, ret, 0, len);
                return Encoding.UTF8.GetString(ret);
            }
            finally
            {
                cryptoStream.Close();
                mStream.Close();
                aes.Clear();
            }
        }

 /// <summary>
 /// 解密
 /// </summary>
 /// <param name="text">要被解密字符</param>
 /// <param name="sKey">密钥</param>
 /// <returns></returns>
 public static string Decrypt(this string text, string sKey)
 {
     var provider = new DESCryptoServiceProvider();
     int num = text.Length / 2;
     byte[] buffer = new byte[num];
     try
     {
         for (int i = 0; i < num; i++)
         {
             int num3 = Convert.ToInt32(text.Substring(i * 2, 2), 0x10);
             buffer[i] = (byte)num3;
         }
     }
     catch
     {
         return string.Empty;
     }
     provider.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
     provider.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
     MemoryStream stream = new MemoryStream();
     CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
     try
     {
         stream2.Write(buffer, 0, buffer.Length);
         stream2.FlushFinalBlock();
     }
     catch
     {
         return string.Empty;
     }
     return Encoding.Default.GetString(stream.ToArray());
 }

        // Decrypt a byte array into a byte array using a key and an IV
        public static byte[] Decrypt(byte[] cipherData, byte[] Key, byte[] IV, CipherMode cipherMode, PaddingMode paddingMode)
        {
            // Create a MemoryStream that is going to accept the
            // decrypted bytes
            MemoryStream ms = new MemoryStream();

            // Create a symmetric algorithm.
            // We are going to use Rijndael because it is strong and
            // available on all platforms.
            // You can use other algorithms, to do so substitute the next
            // line with something like
            //     TripleDES alg = TripleDES.Create();

            Rijndael alg = Rijndael.Create();

            // Now set the key and the IV.
            // We need the IV (Initialization Vector) because the algorithm
            // is operating in its default
            // mode called CBC (Cipher Block Chaining). The IV is XORed with
            // the first block (8 byte)
            // of the data after it is decrypted, and then each decrypted
            // block is XORed with the previous
            // cipher block. This is done to make encryption more secure.
            // There is also a mode called ECB which does not need an IV,
            // but it is much less secure.

            alg.Mode = cipherMode;
            alg.Padding = paddingMode;
            alg.Key = Key;
            alg.IV = IV;

            // Create a CryptoStream through which we are going to be
            // pumping our data.
            // CryptoStreamMode.Write means that we are going to be
            // writing data to the stream
            // and the output will be written in the MemoryStream
            // we have provided.

            CryptoStream cs = new CryptoStream(ms,
                alg.CreateDecryptor(), CryptoStreamMode.Write);

            // Write the data and make it do the decryption
            cs.Write(cipherData, 0, cipherData.Length);

            // Close the crypto stream (or do FlushFinalBlock).
            // This will tell it that we have done our decryption
            // and there is no more data coming in,
            // and it is now a good time to remove the padding
            // and finalize the decryption process.

            cs.Close();

            // Now get the decrypted data from the MemoryStream.
            // Some people make a mistake of using GetBuffer() here,
            // which is not the right way.

            byte[] decryptedData = ms.ToArray();

            return decryptedData;
        }

        /// <summary>
        /// 加密方法
        /// </summary>
        /// <param name="pToEncrypt">需要加密字符串</param>
        /// <param name="sKey">密钥</param>
        /// <returns>加密后的字符串</returns>
        public static string Encrypt(string pToEncrypt, string sKey)
        {
            try
            {
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                //把字符串放到byte数组中

                //原来使用的UTF8编码，我改成Unicode编码了，不行
                byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);

                //建立加密对象的密钥和偏移量

                //使得输入密码必须输入英文文本
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                StringBuilder ret = new StringBuilder();
                foreach (byte b in ms.ToArray())
                {
                    ret.AppendFormat("{0:X2}", b);
                }
                ret.ToString();
                return ret.ToString();
            }
            catch (Exception ex)
            {

            }

            return "";
        }

        /// <summary>
        /// 解密方法
        /// </summary>
        /// <param name="pToDecrypt">需要解密的字符串</param>
        /// <param name="sKey">密匙</param>
        /// <returns>解密后的字符串</returns>
        public static string Decrypt(string pToDecrypt, string sKey)
        {
            try
            {
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
                for (int x = 0; x < pToDecrypt.Length / 2; x++)
                {
                    int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                    inputByteArray[x] = (byte)i;
                }

                //建立加密对象的密钥和偏移量，此值重要，不能修改
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                //建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象
                StringBuilder ret = new StringBuilder();
                return System.Text.Encoding.Default.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {

            }
            return "";
        }

        public msgMaid cooking(byte[] otama)
        {
            //メイドオブジェクト
            msgMaid m = new msgMaid();

            //DESC
            TripleDESCryptoServiceProvider frill = new TripleDESCryptoServiceProvider();

            // Triple DES のサービス プロバイダを生成します
            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();

            //取得
            m.houshinokokoro = frill.Key;
            m.zettaifukujyu = frill.IV;

            // source 配列から cryptData 配列へ変換
            // 文字列を byte 配列に変換します
            //byte[] source = Encoding.Unicode.GetBytes(cachusha);

            // 入出力用のストリームを生成します
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(m.houshinokokoro, m.zettaifukujyu), CryptoStreamMode.Write))
                {
                    // ストリームに暗号化するデータを書き込みます
                    cs.Write(otama, 0, otama.Length);
                }

                // 暗号化されたデータを byte 配列で取得します
                m.zenryokushugo = ms.ToArray();
            }

            // byte 配列を文字列に変換して表示します
            return m;
        }