return nil, fmt.Errorf("the SAN extension is incorrectly encoded")
	}

	// Check the rawValue is a sequence.
	if !sequence.IsCompound || sequence.Tag != asn1.TagSequence || sequence.Class != asn1.ClassUniversal {
		return nil, fmt.Errorf("the SAN extension is incorrectly encoded")
	}

	ids := []Identity{}
	for bytes := sequence.Bytes; len(bytes) > 0; {
		var rawValue asn1.RawValue
		var err error

	TagIA5String       = 22
	TagUTCTime         = 23
	TagGeneralizedTime = 24
	TagGeneralString   = 27
	TagBMPString       = 30
)

// ASN.1 class types represent the namespace of the tag.
const (
	ClassUniversal       = 0
	ClassApplication     = 1
	ClassContextSpecific = 2
	ClassPrivate         = 3
)

type tagAndLength struct {
	class, tag, length int
	isCompound         bool
}