如何在ASP.NET中获取随机生成的cookie加密与验证密钥

本文是从ASP.NE T 1.1升级到ASP.NET 2.0需要考虑的Cookie问题的补充，通过示例代码说明如何通过反射在ASP.NET 1.1与ASP.NET 2.0中获取随机生成的cookie加密与验证密钥。

ASP.NET 1.1示例代码：

object machineKeyConfig = HttpContext.Current.GetConfig("system.web/machineKey");

//得到System.Web.Configuration.MachineKey+MachineKeyConfig的实例,MachineKeyConfig是MachineKey的嵌套类

Type machineKeyType = machineKeyConfig.GetType().Assembly.GetType("System.Web.Configuration.MachineKey");

//得到System.Web.Configuration.MachineKey类型

BindingFlags bf = BindingFlags.NonPublic | BindingFlags.Static;

//设置绑定标志

MethodInfo byteArrayToHexString = machineKeyType.GetMethod("ByteArrayToHexString", bf);

//通过反射获取MachineKey中的ByteArrayToHexString方法,该方法用于将字节数组转换为16进制表示的字符串

Byte[] validationKey = (Byte[])machineKeyType.GetField("s_validationKey",bf).GetValue(machineKeyConfig);

//获取验证密钥字节数组

SymmetricAlgorithm algorithm = (SymmetricAlgorithm)machineKeyType.GetField("s_oDes",bf).GetValue(machineKeyConfig);

Byte[] decryptionKey = algorithm.Key;

//获取加密密钥字节数组

string ValidationKey = (string)byteArrayToHexString.Invoke(null,new object[]{validationKey,validationKey.Length});

//将验证密钥字节数组转换为16进制表示的字符串

string DecryptionKey = (string)byteArrayToHexString.Invoke(null,new object[]{decryptionKey,decryptionKey.Length});

//将加密密钥字节数组转换为16进制表示的字符串

ASP.NET 2.0示例代码：

System.Web.Configuration.MachineKeySection machineKeySection = new System.Web.Configuration.MachineKeySection();

//直接创建MachineKeySection的实例,ASP.NET 2.0中用machineKeySection取代ASP.NET 1.1中的MachineKey,并且可以直接访问,没有被internal保护。

Type type = typeof(System.Web.Configuration.MachineKeySection);//或者machineKeySection.GetType();

PropertyInfo propertyInfo = type.GetProperty("ValidationKeyInternal", BindingFlags.NonPublic | BindingFlags.Instance);

Byte[] validationKeyArray = (Byte[])propertyInfo.GetValue(machineKeySection, null);

//获取随机生成的验证密钥字节数组

propertyInfo = type.GetProperty("DecryptionKeyInternal", BindingFlags.NonPublic | BindingFlags.Instance);

Byte[] decryptionKeyArray = (Byte[])propertyInfo.GetValue(machineKeySection, null);

//获取随机生成的加密密钥字节数组

MethodInfo byteArrayToHexString = type.GetMethod("ByteArrayToHexString", BindingFlags.Static | BindingFlags.NonPublic);

//通过反射获取MachineKeySection中的ByteArrayToHexString方法,该方法用于将字节数组转换为16进制表示的字符串

string validationKey = (string)byteArrayToHexString.Invoke(null, new object[] { validationKeyArray, validationKeyArray.Length });

//将验证密钥字节数组转换为16进制表示的字符串

string DecryptionKey = (string)byteArrayToHexString.Invoke(null, new object[] { decryptionKeyArray, decryptionKeyArray.Length });

//将加密密钥字节数组转换为16进制表示的字符串