QuantumGuid.py

#!/usr/bin/env python3
#-----------------------------------------------------------------------------------------------------------------------
#   QuantumGuid
#
#   Creates 1 or more Version 4 GUIDs using the Quantum random number generator service by Australia National
#   University (ANU)
#
#   Compatibilty: Python 3 (Verified on 3.7)
#
#   This is free and unencumbered software released into the public domain - August 2019 waterjuice.org
#-----------------------------------------------------------------------------------------------------------------------

#-----------------------------------------------------------------------------------------------------------------------
#   IMPORTS
#-----------------------------------------------------------------------------------------------------------------------

import urllib.request
import ssl
import json
import uuid
import sys

#-----------------------------------------------------------------------------------------------------------------------
#   FUNCTIONS
#-----------------------------------------------------------------------------------------------------------------------

#-----------------------------------------------------------------------------------------------------------------------
#   main
#-----------------------------------------------------------------------------------------------------------------------
def main( ArgV ):
    if( len(ArgV) != 2 ):
        print( "Syntax:\n  QuantumGuid.py <NumGuids>")
        return 1
    numGuids = int( ArgV[1] )

    if numGuids < 1 or numGuids > 1000:
        print( "Number of GUIDs must be between 1 and 1000")
        return 1

    # Connect to the online service for QRNG at ANU
    url = 'https://qrng.anu.edu.au/API/jsonI.php?length=%u&type=hex16&size=16' % numGuids
    response = urllib.request.urlopen(url)
    data = response.read()
    text = data.decode('utf-8')
    # Convert json
    jdata = json.loads( text )

    if not jdata['success']:
        print( "Failed to get data" )
        return 2
    if not jdata['type'] == 'string':
        print( "Wrong format of data returned from service (expected string)" )
        return 2
    if not jdata['size'] == 16:
        print( "Wrong amount of data returned" )
        return 2

    # Process all the 16 byte random numbers. They need to be converted into type 4 GUIDs by setting the appropriate
    # 6 fixed bits.
    for hexStr in jdata['data']:
        guidBytes = bytearray.fromhex( hexStr )
        guidBytes[6] &= 0x0f   #  Mask out version bits
        guidBytes[6] |= 0x40   #  Set version bits to 4 (Random)
        guidBytes[8] &= 0x3f   #  Mask out variant bits
        guidBytes[8] |= 0x80   #  Set variant bits to RFC4122 variant

        # Convert to a GUID
        guid = uuid.UUID( bytes=bytes(guidBytes) )

        # Print it (Adding the curly braces)
        print( "{%s}" % str(guid) )

#-----------------------------------------------------------------------------------------------------------------------
#   Main Entry Point
#-----------------------------------------------------------------------------------------------------------------------
if __name__ == "__main__":
    exit( main( sys.argv ) )