-

def xor_deencrypt(data, key_struct):
    key = key_struct["7-key"]
    main_key = key_struct["main_key"]
    res = ""
    for c in data:
        it = key_struct["iter"]
        key[it % 7] += main_key[it % 128]
        key[it % 7] &= 0xFF
        res += chr(ord(c) ^ (key[it % 7]))
        key_struct["iter"] += 1
    return res