func newHashShake128() hash.Hash {
	return &state{rate: 168, dsbyte: 0x1f, outputLen: 512}
}
Internal-use instances of SHAKE used to test against KATs.
package sha3
import (
	"bytes"
	"compress/flate"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"hash"
	"os"
	"strings"
	"testing"
)
const (
	testString  = "brekeccakkeccak koax koax"
	katFilename = "testdata/keccakKats.json.deflate"
)