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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
}