package statedb import ( "math/big" ethCommon "github.com/ethereum/go-ethereum/common" "github.com/hermeznetwork/hermez-node/common" "github.com/hermeznetwork/hermez-node/log" "github.com/iden3/go-iden3-crypto/babyjub" "github.com/iden3/go-merkletree" ) func concatEthAddrBJJ(addr ethCommon.Address, pk *babyjub.PublicKey) []byte { pkComp := pk.Compress() var b []byte b = append(b, addr.Bytes()...) b = append(b[:], pkComp[:]...) return b } // setIdxByEthAddrBJJ stores the given Idx in the StateDB as follows: // - key: Eth Address, value: idx // - key: EthAddr & BabyJubJub PublicKey Compressed, value: idx // If Idx already exist for the given EthAddr & BJJ, the remaining Idx will be // always the smallest one. func (s *StateDB) setIdxByEthAddrBJJ(idx common.Idx, addr ethCommon.Address, pk *babyjub.PublicKey) error { oldIdx, err := s.GetIdxByEthAddrBJJ(addr, pk) if err == nil { // EthAddr & BJJ already have an Idx // check which Idx is smaller // if new idx is smaller, store the new one // if new idx is bigger, don't store and return, as the used one will be the old if idx >= oldIdx { log.Debug("StateDB.setIdxByEthAddrBJJ: Idx not stored because there already exist a smaller Idx for the given EthAddr & BJJ") return nil } } // store idx for EthAddr & BJJ assuming that EthAddr & BJJ still don't // have an Idx stored in the DB, and if so, the already stored Idx is // bigger than the given one, so should be updated to the new one // (smaller) tx, err := s.db.NewTx() if err != nil { return err } k := concatEthAddrBJJ(addr, pk) // store Addr&BJJ-idx idxBytes, err := idx.Bytes() if err != nil { return err } err = tx.Put(k, idxBytes[:]) if err != nil { return err } // store Addr-idx err = tx.Put(addr.Bytes(), idxBytes[:]) if err != nil { return err } err = tx.Commit() if err != nil { return err } return nil } // GetIdxByEthAddr returns the smallest Idx in the StateDB for the given // Ethereum Address. Will return common.Idx(0) and error in case that Idx is // not found in the StateDB. func (s *StateDB) GetIdxByEthAddr(addr ethCommon.Address) (common.Idx, error) { b, err := s.db.Get(addr.Bytes()) if err != nil { return common.Idx(0), err } idx, err := common.IdxFromBytes(b) if err != nil { return common.Idx(0), err } return idx, nil } // GetIdxByEthAddrBJJ returns the smallest Idx in the StateDB for the given // Ethereum Address AND the given BabyJubJub PublicKey. If `addr` is the zero // address, it's ignored in the query. If `pk` is nil, it's ignored in the // query. Will return common.Idx(0) and error in case that Idx is not found in // the StateDB. func (s *StateDB) GetIdxByEthAddrBJJ(addr ethCommon.Address, pk *babyjub.PublicKey) (common.Idx, error) { if pk == nil { return s.GetIdxByEthAddr(addr) } k := concatEthAddrBJJ(addr, pk) b, err := s.db.Get(k) if err != nil { return common.Idx(0), err } idx, err := common.IdxFromBytes(b) if err != nil { return common.Idx(0), err } return idx, nil } func siblingsToZKInputFormat(s []*merkletree.Hash) []*big.Int { b := make([]*big.Int, len(s)) for i := 0; i < len(s); i++ { b[i] = s[i].BigInt() } return b } // BJJCompressedTo256BigInts returns a [256]*big.Int array with the bit // representation of the babyjub.PublicKeyComp func BJJCompressedTo256BigInts(pkComp babyjub.PublicKeyComp) [256]*big.Int { var r [256]*big.Int b := pkComp[:] for i := 0; i < 256; i++ { if b[i/8]&(1<<(i%8)) == 0 { r[i] = big.NewInt(0) } else { r[i] = big.NewInt(1) } } return r }