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Python: reverse Cisco type 7 passwords with input from file or stdin
"""
Uncipher Cisco type 7 ciphered passwords
Usage: python uncipher.py <pass> where <pass> is the text of the type 7 password
Example:
$ python uncipher.py 094F4F1D1A0403
catcat
"""
import fileinput
import sys
global key
key = [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]
def uncipher(ciphertext):
try:
index = int(pw[:2],16)
except ValueError:
return ''
pw_text = ciphertext[2:].rstrip()
pw_hex_values = [pw_text[start:start+2] for start in range(0,len(pw_text),2)]
pw_chars = [chr(key[index+i] ^ int(pw_hex_values[i],16)) for i in range(0,len(pw_hex_values))]
pw_plaintext = ''.join(pw_chars)
return pw_plaintext
try:
for pw in fileinput.input():
print uncipher(pw)
except:
pw = sys.argv[1]
print uncipher(pw)
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