paper.python.3c816792f60044320ba90ebb036db304

paper.python.3c816792f60044320ba90ebb036db304

def nymaim_decrypt(self, raw, from_raw, length):
    from_va = from_raw + self.image_base
    xsize = from_va - self.off
    cur_key = self.key
    if xsize < 0:
        raise RuntimeError("raw too small - min is " + hex(self.off - self.image_base))
    for _ in range(xsize / 4):
        cur_key = (cur_key + self.xstep) & 0xffffffff

    r = ''
    length = min(length, len(raw) - from_raw)
    for i in range(length):
        r += chr(raw[from_raw + i] ^ (ror(cur_key, (xsize & 3) * 8) & 0xff))
        xsize += 1
        if xsize % 4 == 0:
            cur_key = (cur_key + self.xstep) & 0xffffffff
    return r