dissertation-2-code/mocks/mac.go

package mocks

import (
	"mpbl3p/shared"
)

type AlmostUselessMac struct{}

func (AlmostUselessMac) CodeLength() int {
	return 4
}

func (AlmostUselessMac) Generate([]byte) []byte {
	return []byte{'a', 'b', 'c', 'd'}
}

func (u AlmostUselessMac) Verify(_, sum []byte) error {
	if !(sum[0] == 'a' && sum[1] == 'b' && sum[2] == 'c' && sum[3] == 'd') {
		return shared.ErrBadChecksum
	}
	return nil
}