Beispiel #1
0
def extract_strings(data, keys):
    fd = BytesIO(keys)
    keys = [fd.read(16) for i in range(U8.read(fd))]
    if not keys:
        return

    fd = BytesIO(data)
    for i in range(U32LE.read(fd)):
        msg = fd.read(U32LE.read(fd))
        key = keys[i % len(keys)]

        return Decryptor(key).decrypt(msg)
Beispiel #2
0
    def iter_tags(self, fd=None, buf=None, skip_header=None):
        flags = U8.read(fd)
        quality = flags & 15
        version = flags >> 4
        lookup_size = U16BE.read(fd)
        enc_table = fd.read(lookup_size)

        key = b""
        iv = b""

        for i in range(16):
            key += fd.read(1)
            iv += fd.read(1)

        if not (key and iv):
            return

        dec_table = self.decrypt_data(key, iv, enc_table)
        dstream = BytesIO(dec_table)

        # Decode lookup table (ported from K-S-V BeatConvert.php)
        while True:
            flags = U8.read(dstream)
            if not flags:
                break

            typ = flags >> 4
            encrypted = (flags & 4) > 0
            keyframe = (flags & 2) > 0
            config = (flags & 1) > 0
            time = U32BE.read(dstream)
            data_length = U32BE.read(dstream)

            if encrypted:
                raw_length = U32BE.read(dstream)
            else:
                raw_length = data_length

            # Decrypt encrypted tags
            data = fd.read(data_length)
            if encrypted:
                data = self.decrypt_data(key, iv, data)
                data = data[:raw_length]

            # Create video tag
            if typ == 1:
                if version == 2:
                    if config:
                        avc = AVCVideoData(AVC_PACKET_TYPE_SEQUENCE_HEADER,
                                           data=data)
                    else:
                        avc = AVCVideoData(AVC_PACKET_TYPE_NALU, data=data)

                    if keyframe:
                        videodata = VideoData(VIDEO_FRAME_TYPE_KEY_FRAME,
                                              VIDEO_CODEC_ID_AVC, avc)
                    else:
                        videodata = VideoData(VIDEO_FRAME_TYPE_INTER_FRAME,
                                              VIDEO_CODEC_ID_AVC, avc)
                else:
                    videodata = RawData(data)

                yield Tag(TAG_TYPE_VIDEO, time, videodata)

            # Create audio tag
            if typ == 2:
                if version == 2:
                    if config:
                        aac = AACAudioData(AAC_PACKET_TYPE_SEQUENCE_HEADER,
                                           data)
                    else:
                        aac = AACAudioData(AAC_PACKET_TYPE_RAW, data)

                    audiodata = AudioData(codec=AUDIO_CODEC_ID_AAC,
                                          rate=AUDIO_RATE_44_KHZ,
                                          bits=AUDIO_BIT_RATE_16,
                                          type=AUDIO_TYPE_STEREO,
                                          data=aac)
                else:
                    audiodata = RawData(data)

                yield Tag(TAG_TYPE_AUDIO, time, audiodata)
Beispiel #3
0
    def iter_tags(self, fd=None, buf=None, skip_header=None):
        flags = U8.read(fd)
        quality = flags & 15
        version = flags >> 4
        lookup_size = U16BE.read(fd)
        enc_table = fd.read(lookup_size)

        key = b""
        iv = b""

        for i in range(16):
            key += fd.read(1)
            iv += fd.read(1)

        if not (key and iv):
            return

        dec_table = self.decrypt_data(key, iv, enc_table)
        dstream = BytesIO(dec_table)

        # Decode lookup table (ported from K-S-V BeatConvert.php)
        while True:
            flags = U8.read(dstream)
            if not flags:
                break

            typ = flags >> 4
            encrypted = (flags & 4) > 0
            keyframe = (flags & 2) > 0
            config = (flags & 1) > 0
            time = U32BE.read(dstream)
            data_length = U32BE.read(dstream)

            if encrypted:
                raw_length = U32BE.read(dstream)
            else:
                raw_length = data_length

            # Decrypt encrypted tags
            data = fd.read(data_length)
            if encrypted:
                data = self.decrypt_data(key, iv, data)
                data = data[:raw_length]

            # Create video tag
            if typ == 1:
                if version == 2:
                    if config:
                        avc = AVCVideoData(AVC_PACKET_TYPE_SEQUENCE_HEADER,
                                           data=data)
                    else:
                        avc = AVCVideoData(AVC_PACKET_TYPE_NALU, data=data)

                    if keyframe:
                        videodata = VideoData(VIDEO_FRAME_TYPE_KEY_FRAME,
                                              VIDEO_CODEC_ID_AVC, avc)
                    else:
                        videodata = VideoData(VIDEO_FRAME_TYPE_INTER_FRAME,
                                              VIDEO_CODEC_ID_AVC, avc)
                else:
                    videodata = RawData(data)

                yield Tag(TAG_TYPE_VIDEO, time, videodata)

            # Create audio tag
            if typ == 2:
                if version == 2:
                    if config:
                        aac = AACAudioData(AAC_PACKET_TYPE_SEQUENCE_HEADER,
                                           data)
                    else:
                        aac = AACAudioData(AAC_PACKET_TYPE_RAW, data)

                    audiodata = AudioData(codec=AUDIO_CODEC_ID_AAC,
                                          rate=AUDIO_RATE_44_KHZ,
                                          bits=AUDIO_BIT_RATE_16,
                                          type=AUDIO_TYPE_STEREO,
                                          data=aac)
                else:
                    audiodata = RawData(data)

                yield Tag(TAG_TYPE_AUDIO, time, audiodata)