QCryptographicHash::Md5 VS md5sum [Solved]
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Hi all,
I need to generate an MD5 sum in Qt 5.This is my example code:
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QCryptographicHash md5_generator(QCryptographicHash::Md5);
md5_generator.addData("123456789");
qDebug() << md5_generator.result().toHex();
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and I get:
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25f9e794323b453885f5181f1b624d0b
@Now I create a file with the same content:
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123456789
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and I try md5sum linux command I get:
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$ md5sum test
b2cfa4183267af678ea06c7407d4d6d8
@Where is the problem?
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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.
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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.
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I just checked for a string "123456789\n" and the checksum is indeed b2cfa4183267af678ea06c7407d4d6d8
So just fix your file.
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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!
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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_lineTo 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
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Very interesting.
Now it's more clear.Thanks!
