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group_store.go
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group_store.go
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package cryptoutil
import (
"context"
"crypto/ed25519"
"crypto/sha256"
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"github.com/ipfs/go-datastore"
"github.com/libp2p/go-libp2p-core/crypto"
"golang.org/x/crypto/hkdf"
"berty.tech/berty/v2/go/internal/datastoreutil"
"berty.tech/berty/v2/go/pkg/errcode"
"berty.tech/berty/v2/go/pkg/protocoltypes"
)
const NamespaceGroupDatastore = "account_groups_datastore"
type GroupDatastore struct {
store datastore.Datastore
}
type GroupDatastoreReadOnly interface {
Has(ctx context.Context, key crypto.PubKey) (bool, error)
Get(ctx context.Context, key crypto.PubKey) (*protocoltypes.Group, error)
}
func (gd *GroupDatastore) key(key []byte) datastore.Key {
return datastore.NewKey(base64.RawURLEncoding.EncodeToString(key))
}
func (gd *GroupDatastore) Has(ctx context.Context, key crypto.PubKey) (bool, error) {
keyBytes, err := key.Raw()
if err != nil {
return false, errcode.ErrSerialization.Wrap(err)
}
return gd.store.Has(ctx, gd.key(keyBytes))
}
func (gd *GroupDatastore) Get(ctx context.Context, key crypto.PubKey) (*protocoltypes.Group, error) {
keyBytes, err := key.Raw()
if err != nil {
return nil, errcode.ErrSerialization.Wrap(err)
}
data, err := gd.store.Get(ctx, gd.key(keyBytes))
if err != nil {
return nil, errcode.ErrMissingMapKey.Wrap(err)
}
g := &protocoltypes.Group{}
if err := g.Unmarshal(data); err != nil {
return nil, errcode.ErrDeserialization.Wrap(err)
}
return g, nil
}
func (gd *GroupDatastore) Put(ctx context.Context, g *protocoltypes.Group) error {
pk, err := g.GetPubKey()
if err != nil {
return errcode.ErrInvalidInput.Wrap(err)
}
if ok, err := gd.Has(ctx, pk); err != nil {
return errcode.ErrInvalidInput.Wrap(err)
} else if ok {
return nil
}
data, err := g.Marshal()
if err != nil {
return errcode.ErrSerialization.Wrap(err)
}
if err := gd.store.Put(ctx, gd.key(g.PublicKey), data); err != nil {
return errcode.ErrKeystorePut.Wrap(err)
}
return nil
}
func (gd *GroupDatastore) Delete(ctx context.Context, pk crypto.PubKey) error {
pkBytes, err := pk.Raw()
if err != nil {
return errcode.ErrSerialization.Wrap(err)
}
return gd.store.Delete(ctx, gd.key(pkBytes))
}
func (gd *GroupDatastore) PutForContactPK(ctx context.Context, pk crypto.PubKey, deviceKeystore DeviceKeystore) error {
if deviceKeystore == nil {
return errcode.ErrInvalidInput.Wrap(fmt.Errorf("missing device keystore"))
}
sk, err := deviceKeystore.ContactGroupPrivKey(pk)
if err != nil {
return errcode.ErrCryptoKeyGeneration.Wrap(err)
}
g, err := GetGroupForContact(sk)
if err != nil {
return errcode.ErrOrbitDBOpen.Wrap(err)
}
if err := gd.Put(ctx, g); err != nil {
return errcode.ErrInternal.Wrap(err)
}
return nil
}
func NewGroupDatastore(ds datastore.Datastore) (*GroupDatastore, error) {
if ds == nil {
return nil, errcode.ErrInvalidInput.Wrap(fmt.Errorf("a datastore is expected"))
}
return &GroupDatastore{
store: datastoreutil.NewNamespacedDatastore(ds, datastore.NewKey(NamespaceGroupDatastore)),
}, nil
}
func GetGroupForContact(contactPairSK crypto.PrivKey) (*protocoltypes.Group, error) {
groupSK, groupSecretSK, err := GetKeysForGroupOfContact(contactPairSK)
if err != nil {
return nil, errcode.ErrCryptoKeyGeneration.Wrap(err)
}
pubBytes, err := groupSK.GetPublic().Raw()
if err != nil {
return nil, errcode.ErrSerialization.Wrap(err)
}
signingBytes, err := SeedFromEd25519PrivateKey(groupSecretSK)
if err != nil {
return nil, errcode.ErrSerialization.Wrap(err)
}
return &protocoltypes.Group{
PublicKey: pubBytes,
Secret: signingBytes,
SecretSig: nil,
GroupType: protocoltypes.GroupTypeContact,
}, nil
}
func GetGroupForAccount(priv, signing crypto.PrivKey) (*protocoltypes.Group, error) {
pubBytes, err := priv.GetPublic().Raw()
if err != nil {
return nil, errcode.ErrSerialization.Wrap(err)
}
signingBytes, err := SeedFromEd25519PrivateKey(signing)
if err != nil {
return nil, errcode.ErrSerialization.Wrap(err)
}
return &protocoltypes.Group{
PublicKey: pubBytes,
Secret: signingBytes,
SecretSig: nil,
GroupType: protocoltypes.GroupTypeAccount,
}, nil
}
func GetKeysForGroupOfContact(contactPairSK crypto.PrivKey) (crypto.PrivKey, crypto.PrivKey, error) {
// Salt length must be equal to hash length (64 bytes for sha256)
hash := sha256.New
ck, err := contactPairSK.Raw()
if err != nil {
return nil, nil, errcode.ErrSerialization.Wrap(err)
}
// Generate Pseudo Random Key using ck as IKM and salt
prk := hkdf.Extract(hash, ck, nil)
if len(prk) == 0 {
return nil, nil, errcode.ErrInternal
}
// Expand using extracted prk and groupID as info (kind of namespace)
kdf := hkdf.Expand(hash, prk, nil)
// Generate next KDF and message keys
groupSeed, err := ioutil.ReadAll(io.LimitReader(kdf, 32))
if err != nil {
return nil, nil, errcode.ErrCryptoKeyGeneration.Wrap(err)
}
groupSecretSeed, err := ioutil.ReadAll(io.LimitReader(kdf, 32))
if err != nil {
return nil, nil, errcode.ErrCryptoKeyGeneration.Wrap(err)
}
sk1 := ed25519.NewKeyFromSeed(groupSeed)
groupSK, _, err := crypto.KeyPairFromStdKey(&sk1)
if err != nil {
return nil, nil, errcode.ErrCryptoKeyGeneration.Wrap(err)
}
sk2 := ed25519.NewKeyFromSeed(groupSecretSeed)
groupSecretSK, _, err := crypto.KeyPairFromStdKey(&sk2)
if err != nil {
return nil, nil, errcode.ErrCryptoKeyGeneration.Wrap(err)
}
return groupSK, groupSecretSK, nil
}