expectedErr: "invalid BMPString",
		},
		{
			name:     "IA5String",
			tag:      cryptobyte_asn1.IA5String,
			value:    []byte{80, 81},
			expected: string("PQ"),
		},
		{
			name:        "IA5String (invalid)",
			tag:         cryptobyte_asn1.IA5String,
			value:       []byte{255},
			expectedErr: "invalid IA5String",
		},
		{
			name:     "NumericString",

	//
	// SubjectAltName ::= GeneralNames
	//
	// GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
	//
	// GeneralName ::= CHOICE {
	//      dNSName                         [2]     IA5String,
	//      uniformResourceIdentifier       [6]     IA5String,
	//      iPAddress                       [7]     OCTET STRING,
	// }
	oidTagMap = map[IdentityType]int{
		TypeDNS: 2,
		TypeURI: 6,
		TypeIP:  7,
	}

   *   rfc822Name                      [1]     IA5String,
   *   dNSName                         [2]     IA5String,
   *   x400Address                     [3]     ORAddress,
   *   directoryName                   [4]     Name,
   *   ediPartyName                    [5]     EDIPartyName,
   *   uniformResourceIdentifier       [6]     IA5String,
   *   iPAddress                       [7]     OCTET STRING,

	ENUM              = Tag(10)
	UTF8String        = Tag(12)
	SEQUENCE          = Tag(16 | classConstructed)
	SET               = Tag(17 | classConstructed)
	PrintableString   = Tag(19)
	T61String         = Tag(20)
	IA5String         = Tag(22)
	UTCTime           = Tag(23)
	GeneralizedTime   = Tag(24)
	GeneralString     = Tag(27)

		(bool(ampersand) && b == '&')
}

// IA5String

// parseIA5String parses an ASN.1 IA5String (ASCII string) from the given
// byte slice and returns it.
func parseIA5String(bytes []byte) (ret string, err error) {
	for _, b := range bytes {
		if b >= utf8.RuneSelf {
			err = SyntaxError{"IA5String contains invalid character"}
			return
		}
	}
	ret = string(bytes)
	return

		}
	}

	return stringEncoder(s), nil
}

func makeIA5String(s string) (e encoder, err error) {
	for i := 0; i < len(s); i++ {
		if s[i] > 127 {
			return nil, StructuralError{"IA5String contains invalid character"}
		}
	}

	return stringEncoder(s), nil
}

func makeNumericString(s string) (e encoder, err error) {
	for i := 0; i < len(s); i++ {
		if !isNumeric(s[i]) {

		for len(value) > 0 {
			s = append(s, uint16(value[0])<<8+uint16(value[1]))
			value = value[2:]
		}

		return string(utf16.Decode(s)), nil
	case cryptobyte_asn1.IA5String:
		s := string(value)
		if isIA5String(s) != nil {
			return "", errors.New("invalid IA5String")
		}
		return s, nil
	case cryptobyte_asn1.Tag(asn1.TagNumericString):
		for _, b := range value {
			if !('0' <= b && b <= '9' || b == ' ') {

	}
	return asn1.Marshal(rawValues)
}

func isIA5String(s string) error {
	for _, r := range s {
		// Per RFC5280 "IA5String is limited to the set of ASCII characters"
		if r > unicode.MaxASCII {
			return fmt.Errorf("x509: %q cannot be encoded as an IA5String", s)
		}
	}

	return nil
}

var x509usepolicies = godebug.New("x509usepolicies")

				DNSNames:     []string{"∞"},
			},
			expectedError: "x509: \"∞\" cannot be encoded as an IA5String",
		},
		{
			name: "marshal: unicode rfc822Name",
			template: &Certificate{
				SerialNumber:   big.NewInt(0),
				EmailAddresses: []string{"∞"},
			},
			expectedError: "x509: \"∞\" cannot be encoded as an IA5String",
		},
		{
			name: "marshal: unicode uniformResourceIdentifier",

		return strings.Contains(str, "failed to parse ") && strings.Contains(str, "constraint")
	}

	encodingError := func(err error) bool {
		return strings.Contains(err.Error(), "cannot be encoded as an IA5String")
	}

	// Bad names in constraints should not parse.
	badNames := []struct {
		name    string
		matcher func(error) bool
	}{
		{"dns:foo.com.", constraintParseError},