INNER CODE UNIT · Go

func

emmansun/gmsm · cbcmac/cbcmac.go:207

func (m *macDES) Size() int {
	return m.size
}

// MAC calculates the MAC of the given data.
// The data is padded with the padding scheme of the block cipher before processing.
// See [github.com/emmansun/gmsm/cbcmac.BlockCipherMAC.MAC].
func (m *macDES) MAC(src []byte) []byte {
	src = m.pad.Pad(src)
	blockSize := m.b1.BlockSize()
	tag := make([]byte, blockSize)
	copy(tag, src[:blockSize])
	m.b1.Encrypt(tag, tag)
	m.b3.Encrypt(tag, tag)
	src = src[blockSize:]
	for len(src) > 0 {
		subtle.XORBytes(tag, tag, src[:blockSize])
		m.b1.Encrypt(tag, tag)

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