decrypt.py

import sys
from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad
import base64

if not len(sys.argv) > 1:
    print("Pass ciphertext to decrypt on the command line:")
    print("Usage: python vfs-decrypt.py EncryptedId")
    sys.exit()

encrypted_data = sys.argv[1]

#Add the key and IV from the report here

def aes_decrypt(hex_key, hex_iv, encrypted_data):
    # Convert hex key and IV to bytes
    key = bytes.fromhex(hex_key)
    iv = bytes.fromhex(hex_iv)

    # Ensure the key and IV are 16 bytes for AES-128
    if len(key) != 16 or len(iv) != 16:
        raise ValueError("Key and IV must be 16 bytes (32 hex characters) long.")

    # Decode the encrypted data from base64
    encrypted_data_bytes = base64.b64decode(encrypted_data)

    # Initializing the cipher with the given IV for decryption
    cipher = AES.new(key, AES.MODE_CBC, iv)

    # Decrypting the data
    decrypted_data = unpad(cipher.decrypt(encrypted_data_bytes), AES.block_size)

    # Converting decrypted data to string
    return decrypted_data.decode('utf-8')

decrypted_data = aes_decrypt(hex_key, hex_iv, encrypted_data)
print("Decrypted:", decrypted_data)