How to use

absorb

method

in

org.spongycastle.crypto.digests.SHA3Digest

  protected int doFinal(byte[] out, int outOff, byte partialByte, int partialBits)
  {
    if (partialBits < 0 || partialBits > 7)
    {
      throw new IllegalArgumentException("'partialBits' must be in the range [0,7]");
    }

    int finalInput = (partialByte & ((1 << partialBits) - 1)) | (0x02 << partialBits);
    int finalBits = partialBits + 2;

    if (finalBits >= 8)
    {
      absorb(new byte[]{ (byte)finalInput }, 0, 1);
      finalBits -= 8;
      finalInput >>>= 8;
    }

    return super.doFinal(out, outOff, (byte)finalInput, finalBits);
  }
}