tlv

Documentation

Overview

Package tlv implements various version (ASN.1 BER, Simple, Compact) TLV encoding using in ISO 7816-4.

Index

• Variables
• func EncodeBER(tvs ...TagValue) (buf []byte, err error)
• func EncodeCompact(tvs ...TagValue) (buf []byte, err error)
• func EncodeSimple(tvs ...TagValue) (buf []byte, err error)
• type Class
• type Tag
  • func (t Tag) Class() Class
  • func (t Tag) IsConstructed() bool
• type TagValue
  • func DecodeBER(buf []byte) (tvs []TagValue, err error)
  • func DecodeCompact(buf []byte) (tvs []TagValue, err error)
  • func DecodeSimple(buf []byte) (tvs []TagValue, err error)
  • func New(t Tag, values ...any) (tv TagValue)
  • func (tv TagValue) MarshalBER() (buf []byte, err error)
  • func (tv *TagValue) UnmarshalBER(buf []byte) ([]byte, error)

Variables

var (
	ErrInvalidTag   = errors.New("invalid tag")
	ErrTagToBig     = errors.New("tag is too big for this encoding")
	ErrValueToLarge = errors.New("valye to large for this encoding")
)

var ErrNotConstructed = errors.New("tag is not constructed but contains children")

Functions

func EncodeBER

func EncodeBER(tvs ...TagValue) (buf []byte, err error)

func EncodeCompact

func EncodeCompact(tvs ...TagValue) (buf []byte, err error)

func EncodeSimple

func EncodeSimple(tvs ...TagValue) (buf []byte, err error)

Types

type Class

type Class byte

const (
	ClassUniversal   Class = 0b00
	ClassApplication Class = 0b01
	ClassContext     Class = 0b10
	ClassPrivate     Class = 0b11
)

type Tag

type Tag uint // In theory ISO 7816-4 also supports 3-byte tags

func (Tag) Class

func (t Tag) Class() Class

func (Tag) IsConstructed

func (t Tag) IsConstructed() bool

type TagValue

type TagValue struct {
	Tag        Tag
	Value      []byte
	Children   []TagValue
	SkipLength bool
}

func DecodeBER

func DecodeBER(buf []byte) (tvs []TagValue, err error)

func DecodeCompact

func DecodeCompact(buf []byte) (tvs []TagValue, err error)

func DecodeSimple

func DecodeSimple(buf []byte) (tvs []TagValue, err error)

func New

func New(t Tag, values ...any) (tv TagValue)

func (TagValue) MarshalBER

func (tv TagValue) MarshalBER() (buf []byte, err error)

func (*TagValue) UnmarshalBER

func (tv *TagValue) UnmarshalBER(buf []byte) ([]byte, error)