def decode_token(username, token, masterpassword):

    # decode the token from hex to bytes
    decoded_token = bytes.fromhex(token)

    unsername_from_token = bytearray()
    for i in range(32):
        unsername_from_token.append(decoded_token[i] ^ ord(masterpassword[i]))

    # remove padding
    unsername_from_token = unsername_from_token.rstrip(':'.encode())
    print("Username from token:", unsername_from_token.decode())

    return unsername_from_token.decode() == username


if __name__ == "__main__":

    token = input("Enter your token: ")
    username = input("Enter your username: ")
    masterpassword = input("Enter your masterpassword (32 characters): ")
    if len(masterpassword) != 32:
        print("Masterpassword must be 32 characters long")
        exit(1)

    if decode_token(username, token, masterpassword):
        print("Token is valid")
    else:
        print("Token is invalid")