checkMask(3, new KDF2BytesGenerator(new SHA256Digest()), seed2, adjustedMask2);
    public void performTest()    {        checkMask(1, new KDF2BytesGenerator(new ShortenedDigest(new SHA256Digest(), 20)), seed1, mask1);        checkMask(2, new KDF2BytesGenerator(new ShortenedDigest(new SHA256Digest(), 20)), seed2, mask2);                try        {            new KDF2BytesGenerator(new SHA1Digest()).generateBytes(new byte[10], 0, 20);                        fail("short input array not caught");        }        catch (DataLengthException e)        {            // expected         }    }