I'm updating my benchmark to use encrypted datafiles, and I get this error when I try to upload something.

Without encryption the datafiles seem to work just fine, but when I add it I get this error.

I am using AES 128 CBC.

this is the unencrypted .xml file

datafile.xml

and this is the encrypted one 

datafile.hwbot

when it goes public I will change the key, so here it is

3778214125442A472D4B615064536756

and the initialization vector 

6E5A723475377821

The iv has to be 16 bytes otherwise cryptodome, the library I use, launches an exception.

this is the function that creates the .xml and encrypts it

def datafile(second):
    time = datetime.datetime.now()
    submission = ET.Element('submission')
    application = ET.Element('application')
    name = ET.Element('name')
    version = ET.Element('version')
    score = ET.Element('score')
    points = ET.Element('points')
    timestamp = ET.Element('timestamp')

    name.text = 'PYPrime'
    version.text = '1.4.1'
    points.text = str(second)
    timestamp.text = str(time)
    submission.set('xmlns:xsi', "http://www.w3.org/2001/XMLSchema-instance")
    submission.set('xmlns', "http://hwbot.org/submit/api?client=pyprime&clientVersion=1.4.1")

    submission.append(application)
    application.append(name)
    application.append(version)
    submission.append(score)
    score.append(points)
    submission.append(timestamp)

    file = open("datafile.hwbot", 'wb')
    file2 = open("datafile.xml", 'wb')

    key = b'3778214125442A472D4B615064536756'

    iv = b'6E5A723475377821'

    cipher = AES.new(key, AES.MODE_CBC, iv=iv)
    file.write(cipher.encrypt(pad(ET.tostring(submission, xml_declaration=True, encoding="utf-8"), 16)))
    file2.write(ET.tostring(submission, xml_declaration=True, encoding="utf-8"))
    file.close()

I've been on stuck on this thing for about 10 hours, I hope someone can help me.

So after a good day of me basically wanting to die I figured out the problem, the hwbot api wants the key and initialization vector encoded in hex notation, while I have to use it in base64 inside python.

That's why the iv is 32byes long in hwbot while it has to be 16 bytes long in python!