INNER CODE UNIT · Go
func
emmansun/gmsm · cbcmac/cbcmac.go:63
func (c *cbcmac) Size() int {
return c.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 (c *cbcmac) MAC(src []byte) []byte {
src = c.pad.Pad(src)
blockSize := c.b.BlockSize()
tag := make([]byte, blockSize)
for len(src) > 0 {
subtle.XORBytes(tag, tag, src[:blockSize])
c.b.Encrypt(tag, tag)
src = src[blockSize:]
}
return tag[:c.size]
}