.NET Framework 中的加密解密

.NET Framework 提供许多标准加密算法的实现。 相关类可在命名空间:System.Security.Cryptography
中找到。详细请参考MSDN。要使用对称加密解密，需要一个RijndaelManaged类的实例。

写了一个SHA加密解密的模块，以下是事例代码：

加密解密数据#region 加密解密数据
//创建RijndaelManaged 实例
        private static RijndaelManaged _createRijndaelManaged(string password)
        ...{
            RijndaelManaged rjdM = new RijndaelManaged();
            PasswordDeriveBytes deriver = new PasswordDeriveBytes(UnicodeEncoding.UTF8.GetBytes(password), null);
            byte[] ivZeros = new byte[8];
            byte[] pbeKey = deriver.CryptDeriveKey("TripleDES", "SHA1", 192, ivZeros);
            rjdM.Key = pbeKey;
            rjdM.IV = new byte[] ...{ 159, 178, 198, 14, 163, 152, 193, 44, 70, 121, 203, 225, 141, 65, 131, 86 };
            return rjdM;
        }
//加密数据
        public static byte[] Encrypt(string password, byte[] toEncrypt)
        ...{
            RijndaelManaged rjdM = _createRijndaelManaged(password);
            ICryptoTransform encryptor = rjdM.CreateEncryptor(rjdM.Key, rjdM.IV);
            MemoryStream msEncrypt = new MemoryStream();
            CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
            csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
            csEncrypt.FlushFinalBlock();
            return msEncrypt.ToArray();
        }
//解密数据
        public static byte[] Decrypt(string password, byte[] encrypted)
        ...{
            RijndaelManaged rjdM = _createRijndaelManaged(password);
            ICryptoTransform decryptor = rjdM.CreateDecryptor(rjdM.Key, rjdM.IV);
            MemoryStream msDecrypt = new MemoryStream(encrypted);
            CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);

            byte[] fromEncrypt = new byte[encrypted.Length];
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);

            return fromEncrypt;
        }
        #endregion