Question

这是一个应计算文件哈希值的函数。但是我总是不时得到错误的哈希码。

string filePath = @"G:\TV\movie.ts"; // about 10 GByte
private void Test()
{

  for (int i = 0; i < 99; i++)
  {
    byte[] bytes;
    try
    {
      var SHA256 = System.Security.Cryptography.SHA256.Create();
      var MD5 = System.Security.Cryptography.MD5.Create();
      var SHA512 = System.Security.Cryptography.SHA512.Create();
      using (var stream = File.OpenRead(filePath))
      {
        stream.Position = 0;
        bytes = MD5.ComputeHash(stream);
        Debug.Print(i + ": " + BitConverter.ToString(bytes).Replace("-", ""));

        stream.Position = 0;
        bytes = SHA256.ComputeHash(stream);
        Debug.Print(i + ": " + BitConverter.ToString(bytes).Replace("-", ""));

        stream.Position = 0;
        bytes = SHA512.ComputeHash(stream);
        Debug.Print(i + ": " + BitConverter.ToString(bytes).Replace("-", ""));
      }
      MD5.Dispose();
      SHA256.Dispose();
      SHA512.Dispose();
    }
    catch (IOException e)
    {
      Debug.Print(e.ToString());
    }
  }
}

一个大文件（电影〜10GB）的结果。对于MD5（短）和SHA256（中），我将偏差标记为粗体。当您查看SHA512（长）结果时，您会发现从执行测试的8倍中，我得到了 4x1B04E14AD6A0D1CC9D131D37D92C90146C118655B50935033A67BC0F436E9CAC424B569CCDB392D12B477DA751F30CD677023D78A55AA3CC97F8F8CD9F941D97 3xF9A6C6C61579FF989F17FB78DD23F1A4B6290588002EE58FB2C9427C75DD35D4745D15DB868CFCC94A49C9227E6C058FB89E862E50E8A06C527FC8C72EDCAFC7 1x1A3050206C8F3E94FC918F140215ADF2A9F463EAF083D421F5AF3FC450A634E9DF04C62889C3F295D504DDE34014CEF4A908C01D26770E250311816F77826B23

这表明，如果出错，通常会导致相同的错误哈希。

所以问题是，为什么每次使用算法算法时都会得到错误的结果？

0：920651841DF511BC45B51DABF76F08D8
0：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
0：1B04E14AD6A0D1CC9D131D37D92C90146C118655B50935033A67BC0F436E9CAC424B569CCDB392D12B477DA751F30CD677023D78A55AA3CC97F8F8CD9F941D97

1：920651841DF511BC45B51DABF76F08D8
1：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
1：1A3050206C8F3E94FC918F140215ADF2A9F463EAF083D421F5AF3FC450A634E9DF04C62889C3F295D504DDE34014CEF4A908C01D26770E250311816F77826B23

2：920651841DF511BC45B51DABF76F08D8
2：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
2：1B04E14AD6A0D1CC9D131D37D92C90146C118655B50935033A67BC0F436E9CAC424B569CCDB392D12B477DA751F30CD677023D78A55AA3CC97F8F8CD9F941D97

3： 944638B455C6C4DBF1B4149B16360C4E
3：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
3：F9A6C6C61579FF989F17FB78DD23F1A4B6290588002EE58FB2C9427C75DD35D4745D15DB868CFCC94A49C9227E6C058FB89E862E50E8A06C527FC8C72EDCAFC7

4：920651841DF511BC45B51DABF76F08D8
4：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
4：1B04E14AD6A0D1CC9D131D37D92C90146C118655B50935033A67BC0F436E9CAC424B569CCDB392D12B477DA751F30CD677023D78A55AA3CC97F8F8CD9F941D97

5：920651841DF511BC45B51DABF76F08D8
5： 03DD7ADCA595F925E9226D1022D2FFB06F59710677E01472E4267E635DC4020A
5：F9A6C6C61579FF989F17FB78DD23F1A4B6290588002EE58FB2C9427C75DD35D4745D15DB868CFCC94A49C9227E6C058FB89E862E50E8A06C527FC8C72EDCAFC7

6：920651841DF511BC45B51DABF76F08D8
6：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
6：1B04E14AD6A0D1CC9D131D37D92C90146C118655B50935033A67BC0F436E9CAC424B569CCDB392D12B477DA751F30CD677023D78A55AA3CC97F8F8CD9F941D97

7： 945F30E57094D2725B727D69F7BE7F4C
7：ADA7EDB960A0EBB298E6BAB8FBF5E2C3D7D2E170B2C19B0B6432A469F2A398B7
7：F9A6C6C61579FF989F17FB78DD23F1A4B6290588002EE58FB2C9427C75DD35D4745D15DB868CFCC94A49C9227E6C058FB89E862E50E8A06C527FC8C72EDCAFC7

Answer 1

如某些评论所述，这似乎是硬件问题。重置BIOS后，它似乎可以再次正常工作。

MD5，SHA-256和SHA-512是否适合计算大型文件的哈希值？

1 个答案: