package manifest import ( "crypto/elliptic" "encoding/hex" "encoding/json" "errors" "sort" "github.com/nspcc-dev/neo-go/pkg/crypto/hash" "github.com/nspcc-dev/neo-go/pkg/crypto/keys" "github.com/nspcc-dev/neo-go/pkg/util" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" ) // Group represents a group of smartcontracts identified by a public key. // Every SC in a group must provide signature of it's hash to prove // it belongs to a group. type Group struct { PublicKey *keys.PublicKey `json:"pubkey"` Signature []byte `json:"signature"` } // Groups is just an array of Group. type Groups []Group type groupAux struct { PublicKey string `json:"pubkey"` Signature []byte `json:"signature"` } // IsValid checks whether group's signature corresponds to the given hash. func (g *Group) IsValid(h util.Uint160) error { if !g.PublicKey.Verify(g.Signature, hash.Sha256(h.BytesBE()).BytesBE()) { return errors.New("incorrect group signature") } return nil } // AreValid checks for groups correctness and uniqueness. func (g Groups) AreValid(h util.Uint160) error { for i := range g { err := g[i].IsValid(h) if err != nil { return err } } if len(g) < 2 { return nil } pkeys := make(keys.PublicKeys, len(g)) for i := range g { pkeys[i] = g[i].PublicKey } sort.Sort(pkeys) for i := range pkeys { if i == 0 { continue } if pkeys[i].Cmp(pkeys[i-1]) == 0 { return errors.New("duplicate group keys") } } return nil } // MarshalJSON implements json.Marshaler interface. func (g *Group) MarshalJSON() ([]byte, error) { aux := &groupAux{ PublicKey: hex.EncodeToString(g.PublicKey.Bytes()), Signature: g.Signature, } return json.Marshal(aux) } // UnmarshalJSON implements json.Unmarshaler interface. func (g *Group) UnmarshalJSON(data []byte) error { aux := new(groupAux) if err := json.Unmarshal(data, aux); err != nil { return err } b, err := hex.DecodeString(aux.PublicKey) if err != nil { return err } pub := new(keys.PublicKey) if err := pub.DecodeBytes(b); err != nil { return err } g.PublicKey = pub if len(aux.Signature) != keys.SignatureLen { return errors.New("wrong signature length") } g.Signature = aux.Signature return nil } // ToStackItem converts Group to stackitem.Item. func (g *Group) ToStackItem() stackitem.Item { return stackitem.NewStruct([]stackitem.Item{ stackitem.NewByteArray(g.PublicKey.Bytes()), stackitem.NewByteArray(g.Signature), }) } // FromStackItem converts stackitem.Item to Group. func (g *Group) FromStackItem(item stackitem.Item) error { if item.Type() != stackitem.StructT { return errors.New("invalid Group stackitem type") } group := item.Value().([]stackitem.Item) if len(group) != 2 { return errors.New("invalid Group stackitem length") } pKey, err := group[0].TryBytes() if err != nil { return err } g.PublicKey, err = keys.NewPublicKeyFromBytes(pKey, elliptic.P256()) if err != nil { return err } sig, err := group[1].TryBytes() if err != nil { return err } if len(sig) != keys.SignatureLen { return errors.New("wrong signature length") } g.Signature = sig return nil }