How to use

com.android.apksig.internal.util.MessageDigestSink

constructor

@Override
public DataSink getDataSink() {
  synchronized (mLock) {
    checkNotDone();
    if (mDataSink == null) {
      mDataSink = new MessageDigestSink(new MessageDigest[] {getMessageDigest()});
    }
    return mDataSink;
  }
}

      cdRecord,
      cdOffsetInApk,
      new MessageDigestSink(mds));
} catch (ZipFormatException e) {
  throw new ApkFormatException("Malformed ZIP entry: " + entryName, e);

MessageDigestSink mdSink = new MessageDigestSink(mds);
byte[] chunkContentPrefix = new byte[5];
chunkContentPrefix[0] = (byte) 0xa5;