cracking.py

import hashing
from abc import ABC, abstractmethod


class Cracker(ABC):
    @abstractmethod
    def crack(self, msg: str, *args, **kwargs):
        pass


class BruteForceCracker(Cracker):
    def __init__(self, alphabet="[:lower:]"):
        if alphabet == "[:lower:]":
            self.alphabet = "abcdefghijklmnopqrstuvwxyz"
        elif alphabet == "[:upper:]":
            self.alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
        elif alphabet == "[:digit:]":
            self.alphabet = "0123456789"
        elif alphabet == "[:alpha:]":
            self.alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
        elif alphabet == "[:alnum:]":
            self.alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
        else:
            self.alphabet = alphabet

    def crack(self, hashed_password: str, hash_function, length=20):
        for L in range(length + 1):
            S = list(self.alphabet[0] * L)
            E = list(self.alphabet[-1] * L)
            P = [0] * L
            while S != E:
                passwd = "".join(S)
                h1 = hash_function(passwd)
                if h1 == hashed_password:  # SHA256Hash().hash
                    return passwd
                for i in range(L):
                    if S[i] == self.alphabet[-1]:
                        S[i] = self.alphabet[0]
                        P[i] = 0
                    else:
                        P[i] += 1
                        S[i] = self.alphabet[P[i]]
                        break
            passwd = "".join(E)
            h1 = hash_function(passwd)
            if h1 == hashed_password:  # SHA256Hash().hash
                return passwd
        return False


class DictionaryCracker(Cracker):
    def __init__(self, dictionary=None, filename=None):
        if dictionary is not None:
            self.dictionary = dictionary
        elif filename is not None:
            with open(filename, "r") as f1:
                self.dictionary = [line.rstrip() for line in f1.readlines()]

    def crack(self, hashed_password: str, hash_function):
        for passwd in self.dictionary:
            h1 = hash_function(passwd)
            if (h1 == hashed_password):
                return passwd
        return False


if __name__ == "__main__":
    cracker = DictionaryCracker(filename="./resources/insat.dic")
    hasher = hashing.SHA256Hash()
    print(cracker.crack(hasher("zouari.rami@insat.ucar.tn"), hash_function=hasher))
    # print("".join(['a','b','c']))

# @insat.ucar.tn: size 14
# xxxxxx.yyyyy@insat.ucar.tn   , x: a-z , y: a-z
# crunch 26 26 -t @@@@@@.@@@@@@insat.ucar.tn -l aaaaaaaaaaaa@aaaaaaaaaaaaa -o insat.dic