yw_save.py 文件源码

def yw_proc(data, isEncrypt, key=None, head=None, validator=None):
    out = bytearray()
    length = len(data)
    new_crc32 = struct.unpack("<I", data[-8:-4])[0]
    seed = struct.unpack("<I", data[-4:])[0]
    if not isEncrypt:
        if binascii.crc32(data[:-8]) != new_crc32:
            logging.error("Checksum does not match")
            return None
    c = YWCipher(seed, 0x1000)
    out += c.encrypt(data[:-8])
    out += data[-8:]
    if isEncrypt:
        new_crc32 = binascii.crc32(out[:-8])
        struct.pack_into("<I", out, length - 8, new_crc32)
    return bytes(out)