What is inside the qChecksum of Qt?

user_16313546 0
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I'm currently working on a project where I have to decrypt/crypt some string values. I'm working with C# in visual studio 2019, and the objective is to decrypt data to interact with them in an application WPF, and then re-crypt the data after use.

The crypt/decrypt algorithm used is the SimpleCrypt from Qt C++, and I have to transcript that one into C#.

For the context, the data are first crypted once, then I take them from an XML file, decrypt them for use, then crypt them back for the final place to use the data.

I already found how to decrypt the data (transcripted in C#), but when I have to crypt it back, I need to use something similar to the qChecksum. Problem, I don't understand how this function work.

QByteArray ba = plaintext;             //plaintext = "2"
QByteArray integrityProtection;
QDataStream s(&integrityProtection, QIODevice::WriteOnly);
   s << qChecksum(ba.constData(), ba.length());

My data is equal to a string "2" and I suppose to find an integrity protection equal to "âé". After much research, I didn't find what was the exact algorithm used for this function...

Maybe someone has the answer ?

qt c#
1 Answers

On the Qt Forum, I finally found the answer. If you are reading this, guy who's searching the qChecksum, it's corresponding to the CRC16CCITT/X.25 algortithm.

Thanks and good luck !

user_163135460
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