auth.py 文件源码

def client_post_decrypt(self, buf):
        if self.raw_trans:
            return buf
        self.recv_buf += buf
        out_buf = b''
        while len(self.recv_buf) > 4:
            crc = struct.pack('<H', binascii.crc32(self.recv_buf[:2]) & 0xFFFF)
            if crc != self.recv_buf[2:4]:
                raise Exception('client_post_decrypt data uncorrect crc')
            length = struct.unpack('>H', self.recv_buf[:2])[0]
            if length >= 8192 or length < 7:
                self.raw_trans = True
                self.recv_buf = b''
                raise Exception('client_post_decrypt data error')
            if length > len(self.recv_buf):
                break

            if struct.pack('<I', zlib.adler32(self.recv_buf[:length - 4]) & 0xFFFFFFFF) != self.recv_buf[length - 4:length]:
                self.raw_trans = True
                self.recv_buf = b''
                raise Exception('client_post_decrypt data uncorrect checksum')

            pos = common.ord(self.recv_buf[4])
            if pos < 255:
                pos += 4
            else:
                pos = struct.unpack('>H', self.recv_buf[5:7])[0] + 4
            out_buf += self.recv_buf[pos:length - 4]
            self.recv_buf = self.recv_buf[length:]

        if out_buf:
            self.decrypt_packet_num += 1
        return out_buf