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

Algorithm 4

The chaincode about the lookup algorithm of the cuckoo filter.

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

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: Return cf.Buckets[j].lookup(f) || cf.Buckets[k].lookup(f)

15: End procedure