if !useAsm {
		t.Skipf("assembly implementation unavailable")
	}
	useAsm = false
	defer func() { useAsm = true }()
	c := New()
	in := "ΑΒΓΔΕϜΖΗΘΙΚΛΜΝΞΟΠϺϘΡΣΤΥΦΧΨΩ"
	gold := "6922e319366d677f34c504af31bfcb29" +
		"e531c125ecd08679362bffbd6b6ebfb9" +
		"0dcc27dfc1f3d3b16a16c0763cf43b91" +
		"40bbf9bbb7233724e9a0c6655b185d76"
	if _, err := io.WriteString(c, in); err != nil {
		t.Fatalf("could not write to c: %v", err)