QCryptographicHash::Md5 return a different value then md5sum linux command

[Catalin.O]

I'm playing with some script and building an server with socat to share some informations with QT client.

Currently, I'm using:

QByteArray d;
d.append("BUSNUM=" + match.captured(4) + ";DEVNUM=" + match.captured(5) +
                    ";ACTION=" + match.captured(6) + ";ID_VENDOR_ENC=" + match.captured(7));
QString md5 = QString(QCryptographicHash::hash(d,QCryptographicHash::Md5).toHex());

Unfortunately, this value is different the one returned by md5sum linux command.

For computing this value, is there something that should be written in a different way ?

[mrjj]

Hi
https://forum.qt.io/topic/39768/qcryptographichash-md5-vs-md5sum-solved/7

[Catalin.O]

@mrjj Seems the same, but, when building the payload, I'm already using a redirection like:

md5sum <<< payload

[mrjj]

@Catalin.O

But the good news it should give same result if presented with same input so
So check you
QByteArray d;
against your payload.

[hskoglund]

@Catalin-O Just guessing, but because md5sum <<< payload is the same as

md5sum <Enter>
payload <Enter>

i.e. it never checks for a file called payload or anything inside it, it only md5sums those 7 letters and a linefeed.

Maybe md5sum payload is what you want, it sums the contents of the file.

[Catalin.O]

@mrjj said in QCryptographicHash::Md5 return a different value then md5sum linux command:

against your payload.

Thank you for support

I managed to find the issue.

The problem is the redirection that I made.

md5sum <<< text

@hskoglund

you right