A Multi-Blockchain-Based Cross-Domain Authentication and Authorization Scheme for Energy Internet

Algorithm 5

The chaincode about the delete algorithm of the cuckoo filter.

1: Procedure func (s SmartContract) Delete(ctx contractapi.TransactionContextInterface, id string, item string) error

2: cfJSON, err: = ctx.GetStub().GetState(id)

3: If err! = nil then

4:  Return shim.Error(err.Error())

5: End if

6: var cf CFilter

7: err = json.Unmarshal(cfJSON, &cf)

8: If err! = nil then

9:  Return shim.Error(err.Error())

10:   End if

11:   f := fprint([]byte(item), cf.FpSize, Hashfn)

12:   j := hashfp([]byte(item)) % cf.Size

13:   k := (j XOR hashfp(f)) % cf.Size

14:   If cf.Buckets[j].remove(f) || cf.Buckets[k].remove(f) then

15:  cf.Count--

16:   End if

17:   cfJSON, err = json.Marshal(&cf)

18:   If err! = nil then

19:  Return shim.Error(err.Error())

20:   End if

21:   cf_ := CF{id: id, cfilter: cfJSON}

22:   err = ctx.GetStub().PutState(cf_.id, cf_.cfilter)

23:   If err! = nil then

24:  Return shim.Error(err.Error())

25:   End if

26:   Return nil

27: End procedure