System.Security.Cryptography.CryptographicException

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项目背景： asp.net mvc升级到5.2.0.0，web.config的System.Web設置了machineKey

错误：在cshtml的@Html.AntiForgeryToken()抛出System.Security.Cryptography.CryptographicException异常

解决：重置web.config的静态机器码

参考：http://msdn.microsoft.com/en-us/library/ms998288.aspx

1：使用 RNGCryptoServiceProvider 类创建一个随机秘钥

2：选择一个适当的秘钥大小，如下：

1） SHA1, set the validationKey to 64 bytes (128 hexadecimal characters).
2）AES, set the decryptionKey to 32 bytes (64 hexadecimal characters).
3）3DES, set the decryptionKey to 24 bytes (48 hexadecimal characters).

3：创建一个console application生成key，如下代码：

using System;using System.Text;using System.Security;using System.Security.Cryptography;class App {  static void Main(string[] argv) {    int len = 128;    if (argv.Length > 0)      len = int.Parse(argv[0]);    byte[] buff = new byte[len/2];    RNGCryptoServiceProvider rng = new                             RNGCryptoServiceProvider();    rng.GetBytes(buff);    StringBuilder sb = new StringBuilder(len);    for (int i=0; i<buff.Length; i++)      sb.Append(string.Format("{0:X2}", buff[i]));    Console.WriteLine(sb);  }}

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