Java MD5哈希不匹配C＃MD5哈希 [英] Java MD5 hashing not matching C# MD5 hashing

问题描述

我对加密/散列知之甚少。

我必须加密加密密钥。在Java中的例子是这样的...

  String encryptionKey =test; 
 
 MessageDigest messageDigest = MessageDigest.getInstance（MD5）; 
 messageDigest.update（encryptionKey.getBytes（UTF-8），0，encryptionKey.length（））; 
 byte [] encryptionKeyBytes = messageDigest.digest（）; 
  

现在纠正我，如果我错了，但上面的代码散列字符串与MD5算法。

我想在C＃中对相同的字符串进行哈希处理时得到相同的结果。

我当前的C＃代码看起来像像这样......

  string encryptionKey =test; 
 
 var md5 = MD5.Create（）; 
 var keyBytes = Encoding.UTF8.GetBytes（encryptionKey）; 
 byte [] encryptionKeyBytes = md5.ComputeHash（keyBytes）; 
  

但结束字节结果不匹配。

Java获取...

  [0] 9 
 [1] -113 
 [ 2] 107 
 [3] -51 
 [4] 70 
 [5] 33 
 [6] -45 
 [7] 115 
 [ 8] -54 
 [9] -34 
 [10] 78 
 [11] -125 
 [12] 38 
 [13] 39 
 [14] -76 
 [15] -10 
  

C＃ p>

  [0] 9字节
 [1] 143字节
 [2] 107字节
 [ 3] 205字节
 [4] 70字节
 [5] 33字节
 [6] 211字节
 [7] 115字节
 [8] 202字节
 [9] 222字节
 [10] 78字节
 [11] 131字节
 [12] 38字节
 [13] 39字节
 [14 ] 180字节
 [15] 246字节
  

我需要我的C＃代码才能得到相同的结果作为Java代码（而不是其他方式），任何想法？

谢谢。

解决方案

实际上，结果完全相同。像其他整型类型一样，一个字节值可能被解释为有符号或无符号。例如，如果解释为无符号， 10001111 将对应于 143 （您的第二个C＃值）。但是，如果解释为签名（使用二补），其值将为 -113 （您的第二个Java值）。

因此，这种不一致似乎是由于您的值被格式化为用Java签名但在C＃中未签名。如果你想在C＃中得到带符号的字节，你可以使用：

  sbyte [] encryptionKeyBytesSigned = 
 encryptionKeyBytes.Select （b =>（sbyte）b）.ToArray（）; 
  

但是，请注意，这不仅仅是一种格式问题，只会在您显示值时出现。保存到文件时，两个结果应该是相同的。

I know very little about encryption/hashing.

I have to hash an encryption key. The example in Java is like this...

String encryptionKey = "test";

    MessageDigest messageDigest = MessageDigest.getInstance("MD5");
    messageDigest.update(encryptionKey.getBytes("UTF-8"), 0, encryptionKey.length());
    byte[] encryptionKeyBytes = messageDigest.digest();

Now correct me if I'm wrong, but the above code hashes the string with the MD5 algorithm.

And I want the same result when I hash the same string in C#.

My current C# code looks like this...

string encryptionKey = "test";

        var md5 = MD5.Create();
        var keyBytes = Encoding.UTF8.GetBytes(encryptionKey);
        byte[] encryptionKeyBytes = md5.ComputeHash(keyBytes);

But the end byte results do not match.

Java gets...

[0] 9   
[1] -113    
[2] 107 
[3] -51 
[4] 70  
[5] 33  
[6] -45 
[7] 115 
[8] -54 
[9] -34 
[10]    78  
[11]    -125    
[12]    38  
[13]    39  
[14]    -76 
[15]    -10 

C# gets...

    [0] 9   byte
    [1] 143 byte
    [2] 107 byte
    [3] 205 byte
    [4] 70  byte
    [5] 33  byte
    [6] 211 byte
    [7] 115 byte
    [8] 202 byte
    [9] 222 byte
    [10]    78  byte
    [11]    131 byte
    [12]    38  byte
    [13]    39  byte
    [14]    180 byte
    [15]    246 byte

I need my C# code to get the same result as the Java code (not the other way around), any ideas?

Thank you.

解决方案

Actually, the results are identical. Like other integral types, a byte value may be interpreted as either signed or unsigned. For example, 10001111 would correspond to 143 (your second C# value) if interpreted as unsigned. However, if interpreted as signed (using two’s complement), its value would be -113 (your second Java value).

Thus, the disparity seems to be caused by your values being formatted as signed in Java but unsigned in C#. If you want to get signed bytes in C#, you can use:

sbyte[] encryptionKeyBytesSigned = 
    encryptionKeyBytes.Select(b => (sbyte)b).ToArray();

However, be careful that this is not merely a formatting issue that only arises when you display your values. When saved to file, both results should be identical.

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