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CHANGELOG.md

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Changelog

Commit from 14/04/2020

Massive code reorganization and additions

  • Attacks against single key are stored in /attacks/single_key folder;
  • Attacks against multiple keys are stored in /attacks/multi_key folder;
  • Attacks are dynamically loaded;
  • RsaCtfTool core is moved into /lib folder;
  • Sage scripts are moved in /sage folder;
  • RsaCtfTool.py is just an cli parser / some output implemented. No more logic inside;
  • Multi ciphers support;
  • black formatting;
  • New attacks : londahl and qicheng;
  • --dumpkey and --ext now dump information about each keys (public and private).

New tests in test.sh

  • Hastads;
  • Decrypt multiple files;
  • Testing multiple keys against on cipher;
  • Extra information output.

Fixes

  • Multiple attacks are fixed;
  • Better exceptions handling;
  • Code cleaning;
  • Fix a lot of tests.

How to add new attacks

New RsaCtfTool architecture improve code readability and extensibility.

Adding single key attack

If you want to add an attack against a single key, just add a new file into /attacks/single_key/attack_name.py with an attack method. Example :

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

def attack(attack_rsa_obj, publickey, cipher=[]):
    # Code logic here
    return (None, None)
  • attack_rsa_obj : a reference to lib.rsa_attack.RSAAttack instance. it gave access to cli arguments and various information;
  • publickey : a lib.keys_wrapper.PublicKey instance;
  • cipher : a list containing each data to decrypt.

The attack method return a tuple : (private_key, decrypted_data)

  • private_key : an instance of lib.keys_wrapper.PrivateKey if recovered, else None. If multiple keys are recovered, return a list of lib.keys_wrapper.PrivateKey;
  • decrypted_data : if the attack focus on decrypting and not private key retrieving. If the private key is recovered, just return None and it will be decrypted later in script. If no data is recovered, return None. If multiple ciphers are recovered, return a list of bytes.

Adding multiple keys attack

If you want to add an attack against multiple keys, just add a new file into /attacks/multi_key/attack_name.py with an attack method. Example :

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

def attack(attack_rsa_obj, publickeys, cipher=[]):
    # Code logic here
    return (None, None)
  • attack_rsa_obj : a reference to lib.rsa_attack.RSAAttack instance. it gave access to cli arguments and various information;
  • publickeys : a list of lib.keys_wrapper.PublicKey instance;
  • cipher : a list containing each data to decrypt.

The attack method return a tuple : (private_key, decrypted_data)

  • private_key : an instance of lib.keys_wrapper.PrivateKey if recovered, else None. If multiple keys are recovered, return a list of lib.keys_wrapper.PrivateKey;
  • decrypted_data : if the attack focus on decrypting and not private key retrieving. If the private key is recovered, just return None and it will be decrypted later in script. If no data is recovered, return None. If multiple ciphers are recovered, return a list of bytes.

Ending note

Still beerware licensed :) Test, make pull requests (and issues) and add new attacks ! Keep safe & stay at home folks !