QCryptographicHash::Md5 VS md5sum [Solved]

[luca]

Hi all,
I need to generate an MD5 sum in Qt 5.

This is my example code:
@
QCryptographicHash md5_generator(QCryptographicHash::Md5);
md5_generator.addData("123456789");
qDebug() << md5_generator.result().toHex();
@
and I get:
@
25f9e794323b453885f5181f1b624d0b
@

Now I create a file with the same content:
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123456789
@
and I try md5sum linux command I get:
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$ md5sum test
b2cfa4183267af678ea06c7407d4d6d8
@

Where is the problem?

[Chris Kawa]

I checked it with another tool and it's the same as Qt result.
Are you sure you didn't put a newline at the end of the file? It will also count as content.

[sierdzio]

Maybe the Linux tool also takes some file metadata (encoding, maybe BOM is present?) into account? In your Qt code you pass only the raw data. For Linux, you pass a whole file.

[Chris Kawa]

I just checked for a string "123456789\n" and the checksum is indeed b2cfa4183267af678ea06c7407d4d6d8
So just fix your file.

[luca]

Thanks for the answers!

The file was created with "vi" and I didn't put new line at the end of the text.

There probably is in the file a kind of EOF that I don't see.

Thanks again!

[ChrisW67]

By default vi will ensure the last line of the file has a line feed. Your current file will be 10 bytes (11 on Windows). If you are actually using vim, instead of generic vi, you can turn that off:
http://vim.wikia.com/wiki/File_format#Terminator_after_last_line

To create your test file without the line feed (UNIX):
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$ echo -n '123456789' > test.txt
$ ls -l test.txt
-rw-r--r-- 1 chrisw users 9 Apr 4 11:29 test.txt
@

[luca]

Very interesting.
Now it's more clear.

Thanks!