Cisco Type 7 Password Decoder

type7.py

import sys

V = [0x64, 0x73, 0x66, 0x64, 0x3b, 0x6b, 0x66, 0x6f, 0x41, 0x2c, 0x2e,
    0x69, 0x79, 0x65, 0x77, 0x72, 0x6b, 0x6c, 0x64, 0x4a, 0x4b, 0x44,
    0x48, 0x53, 0x55, 0x42, 0x73, 0x67, 0x76, 0x63, 0x61, 0x36, 0x39,
    0x38, 0x33, 0x34, 0x6e, 0x63, 0x78, 0x76, 0x39, 0x38, 0x37, 0x33,
    0x32, 0x35, 0x34, 0x6b, 0x3b, 0x66, 0x67, 0x38, 0x37]

if len(sys.argv) != 2:
    print("Usage: type7.py hash")
    sys.exit(0)

hash = sys.argv[1]
i = int(hash[:2], 16)
r = ""

for j in range(2, len(hash) - 2, 2):
    h = int(hash[j:j+2], 16)
    r = r + chr(h ^ V[i])
    i = (i + 1) % 53

print r