{"Trim", []byte{'a', 'b'}, "ab", nil},
	{"Trim", []byte("☺"), "☺", nil},
	{"TrimLeft", nil, "", nil},
	{"TrimLeft", []byte{}, "", nil},
	{"TrimLeft", []byte{'a'}, "a", nil},
	{"TrimLeft", []byte{'a', 'a'}, "a", nil},
	{"TrimLeft", []byte{'a'}, "ab", nil},
	{"TrimLeft", []byte{'a', 'b'}, "ab", nil},
	{"TrimLeft", []byte("☺"), "☺", nil},
	{"TrimRight", nil, "", nil},
	{"TrimRight", []byte{}, "", []byte{}},

}

func isHexes(s string) bool {
	if s == "" {
		return false
	}
	if s == "empty" {
		return true
	}
	for _, f := range strings.Split(s, " or ") {
		if f == "" || len(f)%2 != 0 || strings.TrimLeft(f, "0123456789abcdef") != "" {
			return false
		}
	}
	return true
}

// It would be nice if the error messages always began with
// the standard file:line: prefix,

_ := bigmod.NewModulus(addOne(decodeHex(t, B))) b, _ := bigmod.NewNat().SetBytes(decodeHex(t, B), q) gcd, err := bigmod.NewNat().GCDVarTime(a, b) // GCD doesn't work if a and b are both even, but LCM handles it. if err == nil { if got := strings.TrimLeft(hex.EncodeToString(gcd.Bytes(p)), "0"); got != GCD { t.Fatalf("unexpected GCD: got %s, want %s", got, GCD) } } lcm, err := totient(p, q) if oddDivisorLargerThan(decodeHex(t, GCD)) { if err != errDivisorTooLarge { t.Fatalf("expected divisor too large...