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From Alexander Gräf (JIRA) <>
Subject [jira] Commented: (CODEC-87) DigestUtils: MD5 checksum is not calculated correctly on linux64-platforms
Date Mon, 14 Sep 2009 10:42:57 GMT


Alexander Gräf commented on CODEC-87:

Yes, you are right, when I use the testcase I am able to see your result:

3194078c1fa327f9856b5b54628f2a39 Linux amd64 UTF-8

Thank you for responding so fast to my requests!

However, what still bothers me now, is that the test:
echo -n "a9P,+§" | md5sum
on my linuxshell still produces:

Maybe we should check this on an alternative UNIX-platform?

> DigestUtils: MD5 checksum is not calculated correctly on linux64-platforms
> --------------------------------------------------------------------------
>                 Key: CODEC-87
>                 URL:
>             Project: Commons Codec
>          Issue Type: Bug
>    Affects Versions: 1.3, 1.4
>         Environment: Suse Enterprise Linux 10 (64bit)
>            Reporter: Alexander Gräf
>         Attachments: md5test.jar, md5testsb.jar
> Actual behaviour: 
> The class DigesterUtils calculates different md5-hashes depending on plattform.
> I used jdk1.5.0_19-32bit on win32 and jdk1.5.0_19-64bit on SLES 10 (64-bit) for testing.

> The effect depends on the charactersequence that is used for the calculation of the hash.
There are some charactersequences that are calculated correctly. I think that the hash that
is calculated on Windows 32 is the correct one since we have checked it by using an other
library for calculating md5-hashes (Tagish-Auth-1.0.3). Since both of the tested libraries
internally make use of the class but differ in the way the calculated
byte[] is transformed in a hex-string, I think that the problem is located in the Hex.encodeHex(byte[]
hashedBytes) method.
> Expected behaviour: 
> The md5-hash should should not depend on the platform and should be equal for all platforms.
> Testcase:
> System.out.println(DigestUtils.md5Hex("a9P,+$")); 
> produces the hash 79c28faa4fec5ceb98137f548f1d6fe3 on Windows XP (32bit).
> The same instruction produces 3191078c1fa327f9856b5b54628f2a39 on Suse Enterprise Linux
10 (64bit).

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