INNER CODE UNIT · Go

NewLMAC

emmansun/gmsm · cbcmac/cbcmac.go:394

func NewLMAC(creator func(key []byte) (cipher.Block, error), key []byte, size int) BlockCipherMAC {
	return NewLMACWithPadding(creator, key, size, padding.NewISO9797M2Padding)
}

// NewLMACWithPadding creates a new LMAC (Length-based Message Authentication Code) with padding.
func NewLMACWithPadding(creator func(key []byte) (cipher.Block, error), key []byte, size int, newPaddingFunc padding.NewPaddingFunc) BlockCipherMAC {
	var b, b1, b2 cipher.Block
	var err error
	if b, err = creator(key); err != nil {
		panic(err)
	}
	if size <= 0 || size > b.BlockSize() {
		panic("cbcmac: invalid size")
	}
	blockSize := b.BlockSize()
	key1 := make([]byte, blockSize)
	key1[blockSize-1] = 0x01
	key2 := make([]byte, blockSize)

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