This is a fork of Cisco IOU License Generator to run on Mac OSX. Make the file executable with " chmod +x CiscoKeyGen.py " and execute it " ./CiscoKeyGen.py ".

CiscoKeyGen.py

#! /usr/bin/python
print "\n*********************************************************************"
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() # for linux
hostid=str(os.popen('hostid')).split()[-1][2:-1] # for Mac OSX 10.9.3 Python 2.7.5
#hostid=str(os.popen('hostid','r',-1)).split()[-1][2:-1] # for win7 Python 3.4.1
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='\x4B\x58\x21\x81\x56\x7B\x0D\xF3\x21\x43\x9B\x7E\xAC\x1D\xE6\x8A'
iouPad2='\x80' + 39*'\0'
#md5input=iouPad1 + iouPad2 + struct.pack('!L', ioukey) + iouPad1
# below ammendment success for Mac OSX 10.9.3 Python 2.7.5
# from https://community.gns3.com/thread/3921#17178
md5input=iouPad1 + iouPad2 + struct.pack('!Q', ioukey) + iouPad1
iouLicense=hashlib.md5(md5input).hexdigest()[:16]
# add license info to $HOME/.iourc
print "\n*********************************************************************"
print "Create the license file $HOME/.iourc with this command:"
print " echo -e '[license]\\n" + hostname + " = " + iouLicense + ";'" + " | tee $HOME/.iourc "
print "\nThe command adds the following text to $HOME/.iourc:"
print "[license]\n" + hostname + " = " + iouLicense + ";"
# disable phone home feature
print "\n*********************************************************************"
print "Disable the phone home feature with this command:"
print " grep -q -F '127.0.0.1 xml.cisco.com' /etc/hosts || echo '127.0.0.1 xml.cisco.com' | sudo tee -a /etc/hosts"
print "\nThe command adds the following text to /etc/hosts:"
print "127.0.0.1 xml.cisco.com"
print "\n*********************************************************************"

If you use Windows, replace line 10 by line 9.