IBM Installation Manager imcl / imutilsc encryptString command decrypt script

cicdecrypt.py

#!/usr/bin/env python3
import re
import sys
import base64
from Crypto.Cipher import AES

val = '^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=)?$'
key = base64.b64decode(b'BTQOll+YFPIcsB+vMfXNTg==')

def decrypt(e):
	p = re.compile(val, re.IGNORECASE)
	if p.match(e): 
		cipher = AES.new(key, AES.MODE_ECB)
		dec = cipher.decrypt(base64.b64decode(e))
		pwd = dec[:-ord(dec[len(dec)-1:])].decode('utf8')
		print(f'{e}:\t{pwd}')
	else:
		print(f'Invalid format: {e}', file=sys.stderr)

def main(argv):
	for arg in argv:
		decrypt(arg)

if __name__ == "__main__":
	if len(sys.argv) < 2:
		print(f'Usage: {sys.argv[0]} b64 [b64 ...]')
		print(f'Example: {sys.argv[0]} U4DQSKB8w2r6uZlbcdHAPQ==')
	else:
		main(sys.argv[1:])