dukpt

Documentation

Index

• Variables
• func BuildTdesKey(key []byte) []byte
• func CalculateKcv(key []byte) ([]byte, error)
• func DeriveIpekFromBdk(bdk []byte, ksn []byte) ([]byte, error)
• func DerivePekFromBdk(bdk []byte, ksn []byte) ([]byte, error)
• func DerivePekFromIpek(ipek []byte, ksn []byte) ([]byte, error)
• func EncodeKsn(result []byte, ksn Ksn)
• func EncryptDecryptAes128Ecb(data, key []byte, encrypt bool) []byte
• func ExtractKsnWithoutCounter(ksn, cleared []byte)
• type Ksn
  • func DecodeKsn(ksn []byte) (result Ksn)

Variables

var (
	REG3_MASK      uint64 = 0x1FFFFF
	SHIFT_REG_MASK uint64 = 0x100000
	REG8_MASK      uint64 = 0xFFFFFFFFFFE00000
	KEY_MASK              = []byte{0xC0, 0xC0, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, 0xC0, 0xC0, 0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00}
	PEK_MASK              = []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF}
)

Functions

func BuildTdesKey

func BuildTdesKey(key []byte) []byte

func CalculateKcv

func CalculateKcv(key []byte) ([]byte, error)

func DeriveIpekFromBdk

func DeriveIpekFromBdk(bdk []byte, ksn []byte) ([]byte, error)

func DerivePekFromBdk

func DerivePekFromBdk(bdk []byte, ksn []byte) ([]byte, error)

func DerivePekFromIpek

func DerivePekFromIpek(ipek []byte, ksn []byte) ([]byte, error)

func EncodeKsn

func EncodeKsn(result []byte, ksn Ksn)

This isn't official as there is no specification on how to build the KSI Aside from TC's 21 bits, the remaining 59 bits are opaque Here we assume the 10-5-5 scheme

func EncryptDecryptAes128Ecb

func EncryptDecryptAes128Ecb(data, key []byte, encrypt bool) []byte

EncryptDecryptAes128Ecb - ECB

func ExtractKsnWithoutCounter

func ExtractKsnWithoutCounter(ksn, cleared []byte)

Types

type Ksn

type Ksn struct {
	Ksi     []byte
	Trsm    []byte
	Counter int
}

func DecodeKsn

func DecodeKsn(ksn []byte) (result Ksn)