bruteforce.py

from rcncipher import encrypt, decrypt

import random
import time

#attempt to brute force the key after taking an input

def text_to_128_bit_hex_chunks(text):
    # Convert text to bytes
    text_bytes = text.encode('utf-8')

    # Calculate the number of 128-bit chunks
    num_chunks = (len(text_bytes) + 15) // 16

    # Pad the text_bytes to make its length a multiple of 16 bytes
    padded_bytes = text_bytes.ljust(num_chunks * 16, b'\0')

    # Divide the padded bytes into 128-bit chunks
    chunks = [padded_bytes[i:i+16] for i in range(0, len(padded_bytes), 16)]

    # Convert each chunk to hexadecimal representation
    hex_chunks = [chunk.hex() for chunk in chunks]
    # print(hex_chunks)
    return hex_chunks

def text_to_hex(text):
    # Convert text to bytes
    text_bytes = text.encode('utf-8')

    # Convert bytes to hexadecimal representation
    hex_representation = text_bytes.hex()

    return hex_representation

def hex_to_text(hex_string):
    # Convert hexadecimal string to bytes
    byte_string = bytes.fromhex(hex_string)

    # Decode bytes to text using UTF-8 encoding
    text = byte_string.decode('utf-8')

    return text


# Function to generate a random 128-bit key
def generate_key():
    key = ""
    for _ in range(128):
        key += str(random.randint(0, 1))
    return key

# Brute force algorithm to test against
def brute_force_attack():
    # Iterate through all possible 128-bit keys
    for i in range(2**128):
        key = bin(i)[2:].zfill(128)
        # Generate a random key
        key = generate_key()
        #convert key to hex
        key = hex(int(key, 2))[2:]
        # if(i == 10):
            # key = "696e646961".zfill(32)
        # print("Generated Key:", key, len(key))

        ct = "3f766df87f5e353255aa5fb0cdb7a3d7"
        # Call your algorithm function here with the generated key
        result = decrypt(ct, key)
        # Check if the result indicates success
        print("Result:", result)
        if result == "636f66666565".zfill(32):
            return key
        else:
            print("Failed:", key)
    return None

if __name__ == "__main__":

    # Start time for brute force attack
    start_time = time.time()

    # Perform brute force attack
    found_key = brute_force_attack()

    # End time for brute force attack
    end_time = time.time()

    if found_key:
        print("Brute force attack successful!")
        print("Found Key:", found_key)
    else:
        print("Brute force attack failed!")

    print("Time taken for brute force attack:", end_time - start_time, "seconds")