mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-29 23:33:37 +00:00
132 lines
3.1 KiB
Go
132 lines
3.1 KiB
Go
package manifest
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import (
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"crypto/elliptic"
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"encoding/hex"
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"encoding/json"
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"errors"
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"sort"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Group represents a group of smartcontracts identified by a public key.
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// Every SC in a group must provide signature of it's hash to prove
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// it belongs to a group.
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type Group struct {
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PublicKey *keys.PublicKey `json:"pubkey"`
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Signature []byte `json:"signature"`
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}
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// Groups is just an array of Group.
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type Groups []Group
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type groupAux struct {
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PublicKey string `json:"pubkey"`
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Signature []byte `json:"signature"`
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}
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// IsValid checks whether group's signature corresponds to the given hash.
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func (g *Group) IsValid(h util.Uint160) error {
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if !g.PublicKey.Verify(g.Signature, hash.Sha256(h.BytesBE()).BytesBE()) {
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return errors.New("incorrect group signature")
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}
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return nil
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}
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// AreValid checks for groups correctness and uniqueness.
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func (g Groups) AreValid(h util.Uint160) error {
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for i := range g {
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err := g[i].IsValid(h)
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if err != nil {
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return err
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}
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}
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if len(g) < 2 {
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return nil
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}
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pkeys := make(keys.PublicKeys, len(g))
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for i := range g {
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pkeys[i] = g[i].PublicKey
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}
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sort.Sort(pkeys)
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for i := range pkeys {
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if i == 0 {
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continue
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}
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if pkeys[i].Cmp(pkeys[i-1]) == 0 {
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return errors.New("duplicate group keys")
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}
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}
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return nil
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}
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// MarshalJSON implements json.Marshaler interface.
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func (g *Group) MarshalJSON() ([]byte, error) {
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aux := &groupAux{
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PublicKey: hex.EncodeToString(g.PublicKey.Bytes()),
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Signature: g.Signature,
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}
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return json.Marshal(aux)
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (g *Group) UnmarshalJSON(data []byte) error {
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aux := new(groupAux)
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if err := json.Unmarshal(data, aux); err != nil {
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return err
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}
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b, err := hex.DecodeString(aux.PublicKey)
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if err != nil {
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return err
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}
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pub := new(keys.PublicKey)
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if err := pub.DecodeBytes(b); err != nil {
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return err
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}
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g.PublicKey = pub
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if len(aux.Signature) != keys.SignatureLen {
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return errors.New("wrong signature length")
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}
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g.Signature = aux.Signature
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return nil
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}
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// ToStackItem converts Group to stackitem.Item.
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func (g *Group) ToStackItem() stackitem.Item {
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return stackitem.NewStruct([]stackitem.Item{
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stackitem.NewByteArray(g.PublicKey.Bytes()),
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stackitem.NewByteArray(g.Signature),
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})
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}
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// FromStackItem converts stackitem.Item to Group.
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func (g *Group) FromStackItem(item stackitem.Item) error {
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if item.Type() != stackitem.StructT {
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return errors.New("invalid Group stackitem type")
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}
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group := item.Value().([]stackitem.Item)
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if len(group) != 2 {
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return errors.New("invalid Group stackitem length")
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}
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pKey, err := group[0].TryBytes()
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if err != nil {
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return err
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}
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g.PublicKey, err = keys.NewPublicKeyFromBytes(pKey, elliptic.P256())
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if err != nil {
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return err
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}
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sig, err := group[1].TryBytes()
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if err != nil {
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return err
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}
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if len(sig) != keys.SignatureLen {
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return errors.New("wrong signature length")
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}
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g.Signature = sig
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return nil
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}
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