hls_decrypt.py 文件源码

def decrypt(self):
        decrypted_chunk = SpooledTemporaryFile(
            max_size=self.POOL_SIZE,
            mode='wb+'
        )
        cipher = AES.new(self.key, AES.MODE_CBC, self.iv)

        next_chunk = ''
        finished = False

        while not finished:
            chunk, next_chunk = next_chunk, \
                self.chunk_stream.read(1024 * AES.block_size)

            chunk = cipher.decrypt(chunk)

            if len(next_chunk) == 0:
                chunk = self.pkcs7_reverse_padded_chunk(chunk)
                finished = True
            if chunk:
                decrypted_chunk.write(chunk)

        decrypted_chunk.seek(0)
        return decrypted_chunk