C# CryptoStream.Close方法代码示例

        // 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;
        }

        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();
        }

        /// <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();
            }
        }

        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();
        }

 protected static string DecryptString(string InputText, string Password)
 {
     try
     {
         RijndaelManaged RijndaelCipher = new RijndaelManaged();
         byte[] EncryptedData = Convert.FromBase64String(InputText);
         byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());
         PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);
         // Create a decryptor from the existing SecretKey bytes.
         ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(16), SecretKey.GetBytes(16));
         MemoryStream memoryStream = new MemoryStream(EncryptedData);
         // Create a CryptoStream. (always use Read mode for decryption).
         CryptoStream cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);
         // Since at this point we don't know what the size of decrypted data
         // will be, allocate the buffer long enough to hold EncryptedData;
         // DecryptedData is never longer than EncryptedData.
         byte[] PlainText = new byte[EncryptedData.Length];
         // Start decrypting.
         int DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);
         memoryStream.Close();
         cryptoStream.Close();
         // Convert decrypted data into a string.
         string DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount);
         // Return decrypted string.
         return DecryptedData;
     }
     catch (Exception exception)
     {
         return (exception.Message);
     }
 }

 public string Decrypt(string strEncryptedText)
 {
     if (strEncryptedText == null || strEncryptedText.Equals(""))
         return strEncryptedText;
     string strDecryptedText = null;
     RijndaelManaged rijndael = new RijndaelManaged();
     ICryptoTransform decryptor = rijndael.CreateDecryptor(Key, IV);
     byte[] byteEncryptedText = Convert.FromBase64String(strEncryptedText);
     MemoryStream memStream = new MemoryStream(byteEncryptedText);
     CryptoStream decryptStream = null;
     try
     {
         decryptStream = new CryptoStream(memStream, decryptor, CryptoStreamMode.Read);
         byte[] byteDecryptedText = new byte[byteEncryptedText.Length];
         int decryptedByteCount = decryptStream.Read(byteDecryptedText, 0, byteDecryptedText.Length);
         strDecryptedText = Encoding.UTF8.GetString(byteDecryptedText, 0, decryptedByteCount);
     }
     finally
     {
         if (rijndael != null) rijndael.Clear();
         if (decryptor != null) decryptor.Dispose();
         if (memStream != null) memStream.Close();
         if (decryptStream != null) decryptStream.Close();
     }
     if (UseSalt)
         strDecryptedText = strDecryptedText.Substring(8);
     return strDecryptedText;
 }

        public static string Decrypt(string cipherText, string passPhrase)
        {
            // Get the complete stream of bytes that represent:
            // [32 bytes of Salt] + [32 bytes of IV] + [n bytes of CipherText]
            var cipherTextBytesWithSaltAndIv = Convert.FromBase64String(cipherText);
            // Get the saltbytes by extracting the first 32 bytes from the supplied cipherText bytes.
            var saltStringBytes = cipherTextBytesWithSaltAndIv.Take(Keysize / 8).ToArray();
            // Get the IV bytes by extracting the next 32 bytes from the supplied cipherText bytes.
            var ivStringBytes = cipherTextBytesWithSaltAndIv.Skip(Keysize / 8).Take(Keysize / 8).ToArray();
            // Get the actual cipher text bytes by removing the first 64 bytes from the cipherText string.
            var cipherTextBytes = cipherTextBytesWithSaltAndIv.Skip((Keysize / 8) * 2).Take(cipherTextBytesWithSaltAndIv.Length - ((Keysize / 8) * 2)).ToArray();

            var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations);
            var keyBytes = password.GetBytes(Keysize / 8);
            using (var symmetricKey = new RijndaelManaged())
            {
                symmetricKey.BlockSize = 256;
                symmetricKey.Mode = CipherMode.CBC;
                symmetricKey.Padding = PaddingMode.PKCS7;
                using (var decryptor = symmetricKey.CreateDecryptor(keyBytes, ivStringBytes))
                {
                    using (var memoryStream = new MemoryStream(cipherTextBytes))
                    {
                        using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
                        {
                            var plainTextBytes = new byte[cipherTextBytes.Length];
                            var decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
                            memoryStream.Close();
                            cryptoStream.Close();
                            return Encoding.UTF8.GetString(plainTextBytes, 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 void EncryptFile(string sInputFilename,string sOutputFilename,string sKey)
        {
            var fsInput = new FileStream(sInputFilename,
                FileMode.Open,
                FileAccess.Read);

            var fsEncrypted = new FileStream(sOutputFilename,
                            FileMode.Create,
                            FileAccess.Write);
            var DES = new DESCryptoServiceProvider();
            
            DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);

            ICryptoTransform desencrypt = DES.CreateEncryptor();
            var cryptostream = new CryptoStream(fsEncrypted,
                                desencrypt,
                                CryptoStreamMode.Write);

            byte[] bytearrayinput = new byte[fsInput.Length - 1];
            fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
            cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);

            cryptostream.Close();
            fsInput.Close();
            fsEncrypted.Close();

        }

        public int dbEncrypt(String partition, int size, String data, out String dataOut)
        {
            AesManaged aes = null;
            MemoryStream memoryStream = null;
            CryptoStream cryptoStream = null;

            try
            {
                aes = new AesManaged();
                aes.Key = readKeyFromFile(partition);

                memoryStream = new MemoryStream();
                cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write);

                byte[] buf = Encoding.UTF8.GetBytes(data);
                cryptoStream.Write(buf, 0, buf.Length);
                cryptoStream.FlushFinalBlock();

                dataOut = Convert.ToBase64String(memoryStream.ToArray());
            }
            finally
            {
                if (cryptoStream != null)
                    cryptoStream.Close();

                if (memoryStream != null)
                    memoryStream.Close();

                if (aes != null)
                    aes.Clear();
            }

            return getErrorCode() == 0 ? 1 : 0;
        }

		/// <summary>
		/// Encrypts a string
		/// </summary>
		/// <param name="PlainText">Text to be encrypted</param>
		/// <param name="Password">Password to encrypt with</param>
		/// <param name="Salt">Salt to encrypt with</param>
		/// <param name="InitialVector">Needs to be 16 ASCII characters long</param>
		/// <param name="HashAlgorithm">Can be either SHA1 or MD5</param>
		/// <param name="PasswordIterations">Number of iterations to do</param>
		/// <param name="KeySize">Can be 128, 192, or 256</param>
		/// <returns>An encrypted bytes</returns>
		public static byte[] Encrypt(byte[] PlainText, byte[] Password, byte[] InitialVector,
			byte[] Salt)
		{
			PasswordDeriveBytes DerivedPassword = new PasswordDeriveBytes(Password, Salt, HASH_ALGORITHM, PASSWORDITERATIONS);
			byte[] KeyBytes = DerivedPassword.GetBytes(KEY_SIZE / 8);
			RijndaelManaged SymmetricKey = new RijndaelManaged();
			SymmetricKey.Mode = CipherMode.CBC;
			byte[] CipherTextBytes = null;

			using (ICryptoTransform Encryptor = SymmetricKey.CreateEncryptor(KeyBytes, InitialVector))
			{
				using (MemoryStream MemStream = new MemoryStream())
				{
					using (CryptoStream CryptoStream = new CryptoStream(MemStream, Encryptor, CryptoStreamMode.Write))
					{
						CryptoStream.Write(PlainText, 0, PlainText.Length);
						CryptoStream.FlushFinalBlock();
						CipherTextBytes = MemStream.ToArray();
						MemStream.Close();
						CryptoStream.Close();
					}
				}
			}

			SymmetricKey.Clear();
			return CipherTextBytes;
			//return Encoding.UTF8.GetBytes(Convert.ToBase64String(CipherTextBytes));
		}

        public static string Decrypt(string TextToBeDecrypted)
        {
            RijndaelManaged RijndaelCipher = new RijndaelManaged();

            string Password = "SageCRMTogether";
            string DecryptedData;

            try
            {
                byte[] EncryptedData = Convert.FromBase64String(TextToBeDecrypted);

                byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString());
                //Making of the key for decryption
                PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt);
                //Creates a symmetric Rijndael decryptor object.
                ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));

                MemoryStream memoryStream = new MemoryStream(EncryptedData);
                //Defines the cryptographics stream for decryption.THe stream contains decrpted data
                CryptoStream cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);

                byte[] PlainText = new byte[EncryptedData.Length];
                int DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);
                memoryStream.Close();
                cryptoStream.Close();

                //Converting to string
                DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount);
            }
            catch
            {
                DecryptedData = TextToBeDecrypted;
            }
            return DecryptedData;
        }

        /// <summary>
        /// A chave deve possuir 16 com caracteres "1234567890123456"
        /// </summary>
        /// <param name="str"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetCriptografiaSimetrica(this string str, string key)
        {
            using (TripleDESCryptoServiceProvider provider = new TripleDESCryptoServiceProvider())
            {

                provider.Mode = CipherMode.CFB;
                provider.Padding = PaddingMode.PKCS7;

                MemoryStream mStream = new MemoryStream();

                CryptoStream cs = new CryptoStream(mStream, provider.CreateEncryptor(Encoding.UTF8.GetBytes(key), new byte[] { 138, 154, 251, 188, 64, 108, 167, 121 }), CryptoStreamMode.Write);

                byte[] toEncrypt = new UTF8Encoding().GetBytes(str);

                cs.Write(toEncrypt, 0, toEncrypt.Length);
                cs.FlushFinalBlock();
                byte[] ret = mStream.ToArray();

                mStream.Close();
                cs.Close();

                str = Convert.ToBase64String(ret);

            }


            return str;
        }

 public static void DecryptFile(string inputFile, string outputFile, string keyIV)
 {
     byte[] array = new byte[0x20];
     byte[] buffer2 = new byte[0x10];
     HexStringToByteArray(keyIV, array, 0);
     HexStringToByteArray(keyIV, buffer2, 0x40);
     FileStream stream = File.Open(inputFile, System.IO.FileMode.Open);
     FileStream stream2 = File.Open(outputFile, System.IO.FileMode.CreateNew);
     AesManaged managed = new AesManaged {
         Key = array,
         IV = buffer2
     };
     CryptoStream stream3 = new CryptoStream(stream, managed.CreateDecryptor(managed.Key, managed.IV), CryptoStreamMode.Read);
     try
     {
         int num;
         byte[] buffer = new byte[0xa000];
         while ((num = stream3.Read(buffer, 0, buffer.Length)) > 0)
         {
             stream2.Write(buffer, 0, num);
         }
     }
     finally
     {
         stream3.Close();
         stream.Close();
         stream2.Close();
     }
 }

 /// <summary>
 /// 加密字符串
 /// </summary>
 /// <param name="inputStr">输入字符串</param>
 /// <param name="keyStr">密码，可以为“”</param>
 /// <returns>输出加密后字符串</returns>
 public string EncryptString(string inputStr, string keyStr)
 {
     DESCryptoServiceProvider des = new DESCryptoServiceProvider();
     if (keyStr == "")
         keyStr = key;
     byte[] inputByteArray = Encoding.Default.GetBytes(inputStr);
     byte[] keyByteArray = Encoding.Default.GetBytes(keyStr);
     SHA1 ha = new SHA1Managed();
     byte[] hb = ha.ComputeHash(keyByteArray);
     sKey = new byte[8];
     sIV = new byte[8];
     for (int i = 0; i < 8; i++)
         sKey[i] = hb[i];
     for (int i = 8; i < 16; i++)
         sIV[i - 8] = hb[i];
     des.Key = sKey;
     des.IV = sIV;
     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);
     }
     cs.Close();
     ms.Close();
     return ret.ToString();
 }