simple key generator example in python

keygen.py

#!/usr/bin/python3

import re
import hashlib
import random
import argparse

def validateKey(k):
  k = k.strip()
  k = k.upper()
  
  pattern = re.compile("^[A-Z0-9]{16}$")

  # if found match (entire string matches pattern)
  if pattern.fullmatch(k) is None:
    return False
    
  h = hashlib.md5(k.encode())
  h = h.hexdigest().lower()
  
  h2 = hashlib.md5(h.encode())
  h2 = h2.hexdigest().lower()
  
  h3 = hashlib.md5(h2.encode())
  h3 = h3.hexdigest().lower()
  
  #print(h, h2, h3)
  return h3[-2] + h3[-1] == '57' and h[0] == 'a' and h2[7] == 'b' and h[-10] == 'd' #and h2[9] == '9'
  
  
def generateKey():
  alphabet='ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
  j=0
  while 1:
    j+=1
    k=''
    for i in range(16):
      k += random.choice(alphabet)

    res = validateKey(k)
    #print(j, k, res)
    if res:
      #print('iterations:', j, 'key:', k)
      return k


parser = argparse.ArgumentParser()
parser.add_argument('-c', '--count', default=1,  type=int)
args = parser.parse_args()
for i in range(args.count):
        print(generateKey())
  

# usage:
#
# $ python3 keygen.py 
# 0EH1KRR2A9JXK6LB
#
# $ python3 keygen.py -c 3
# ELIFO96SCI7YVAI9
# V6WIV1J6IT21MU6U
# CMSZSNHZ3ZTBBXF5
#