How to generate Cisco IOURC licence key on GNS3 VM with Python 3

CiscoIOUKeygen3f.py


#! /usr/bin/python3
print("*********************************************************************")
print("Cisco IOU License Generator - Kal 2011, python port of 2006 C version")
import os
import socket
import hashlib
import struct
# get the host id and host name to calculate the hostkey
hostid=os.popen("hostid").read().strip()
hostname = socket.gethostname()
ioukey=int(hostid,16)
for x in hostname:
 ioukey = ioukey + ord(x)
print("hostid=" + hostid +", hostname="+ hostname + ", ioukey=" + hex(ioukey)[2:])
# create the license using md5sum
iouPad1 = b'\x4B\x58\x21\x81\x56\x7B\x0D\xF3\x21\x43\x9B\x7E\xAC\x1D\xE6\x8A'
iouPad2 = b'\x80' + 39*b'\0'
md5input=iouPad1 + iouPad2 + struct.pack('!i', ioukey) + iouPad1
iouLicense=hashlib.md5(md5input).hexdigest()[:16]

print("\nAdd the following text to ~/.iourc:")
print("[license]\n" + hostname + " = " + iouLicense + ";\n")
with open("iourc.txt", "wt") as out_file:
 out_file.write("[license]\n" + hostname + " = " + iouLicense + ";\n")
print("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAlready copy to the file iourc.txt\n ")

print("You can disable the phone home feature with something like:")
print(" echo '127.0.0.127 xml.cisco.com' >> /etc/hosts\n")

To run this python script copy text to CiscoIOUKeygen3f.py or
wget http://www.ipvanquish.com/download/CiscoIOUKeygen3f.py

‘python3 CiscoIOUKeygen3f.py’

Here is a link for Cisco IOU gen for Python 2

Here is a link for Routing Loop

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