Package com.google.android.exoplayer2.upstream.crypto

Class AesCipherDataSink

  • All Implemented Interfaces:
    DataSink
    public final class AesCipherDataSink
extends Object
implements DataSink
    A wrapping DataSink that encrypts the data being consumed.

    • Constructor Detail

      • AesCipherDataSink

        public AesCipherDataSink​(byte[] secretKey,
                         DataSink wrappedDataSink)
        Create an instance whose write methods have the side effect of overwriting the input data. Use this constructor for maximum efficiency in the case that there is no requirement for the input data arrays to remain unchanged.
        Parameters:
        secretKey - The key data.
        wrappedDataSink - The wrapped DataSink.

      • AesCipherDataSink

        public AesCipherDataSink​(byte[] secretKey,
                         DataSink wrappedDataSink,
                         @Nullable
                         byte[] scratch)
        Create an instance whose write methods are free of side effects. Use this constructor when the input data arrays are required to remain unchanged.
        Parameters:
        secretKey - The key data.
        wrappedDataSink - The wrapped DataSink.
        scratch - Scratch space. Data is encrypted into this array before being written to the wrapped DataSink. It should be of appropriate size for the expected writes. If a write is larger than the size of this array the write will still succeed, but multiple cipher calls will be required to complete the operation. If null then encryption will overwrite the input data.

    • Method Detail

      • open

        public void open​(DataSpec dataSpec)
          throws IOException
        Description copied from interface: DataSink
        Opens the sink to consume the specified data.

        Note: If an IOException is thrown, callers must still call DataSink.close() to ensure that any partial effects of the invocation are cleaned up.

        Specified by:
        open in interface DataSink
        Parameters:
        dataSpec - Defines the data to be consumed.
        Throws:
        IOException - If an error occurs opening the sink.

      • write

        public void write​(byte[] buffer,
                  int offset,
                  int length)
           throws IOException
        Description copied from interface: DataSink
        Consumes the provided data.
        Specified by:
        write in interface DataSink
        Parameters:
        buffer - The buffer from which data should be consumed.
        offset - The offset of the data to consume in buffer.
        length - The length of the data to consume, in bytes.
        Throws:
        IOException - If an error occurs writing to the sink.