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45 lines
1.7 KiB
45 lines
1.7 KiB
6 months ago
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import asyncio
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from loguru import logger
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from src.adb import Device
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from src.exceptions import DecryptException
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from src.models.song_data import Datum
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from src.mp4 import SongInfo, SampleInfo
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from src.types import defaultId, prefetchKey
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async def decrypt(info: SongInfo, keys: list[str], manifest: Datum, device: Device) -> bytes:
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async with device.decryptLock:
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logger.info(f"Decrypting song: {manifest.attributes.artistName} - {manifest.attributes.name}")
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reader, writer = await asyncio.open_connection(device.host, device.fridaPort)
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decrypted = bytes()
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last_index = 255
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for sample in info.samples:
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if last_index != sample.descIndex:
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if len(decrypted) != 0:
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writer.write(bytes([0, 0, 0, 0]))
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key_uri = keys[sample.descIndex]
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track_id = manifest.id
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if key_uri == prefetchKey:
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track_id = defaultId
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writer.write(bytes([len(track_id)]))
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writer.write(track_id.encode("utf-8"))
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writer.write(bytes([len(key_uri)]))
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writer.write(key_uri.encode("utf-8"))
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last_index = sample.descIndex
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result = await decrypt_sample(writer, reader, sample)
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decrypted += result
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writer.write(bytes([0, 0, 0, 0]))
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writer.close()
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return decrypted
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async def decrypt_sample(writer: asyncio.StreamWriter, reader: asyncio.StreamReader, sample: SampleInfo) -> bytes:
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writer.write(len(sample.data).to_bytes(4, byteorder="little", signed=False))
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writer.write(sample.data)
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result = await reader.read(len(sample.data))
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if not result:
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raise DecryptException
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return result
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