package rangehashsvc import ( "context" "crypto/sha256" "fmt" "hash" "github.com/nspcc-dev/neofs-api-go/pkg" "github.com/nspcc-dev/neofs-node/pkg/local_object_storage/localstore" "github.com/nspcc-dev/neofs-node/pkg/util" "github.com/nspcc-dev/tzhash/tz" "github.com/pkg/errors" ) type localHasher struct { storage *localstore.Storage } func (h *localHasher) hashRange(ctx context.Context, prm *Prm, handler func([][]byte)) error { obj, err := h.storage.Get(prm.addr) if err != nil { return errors.Wrapf(err, "(%T) could not get object from local storage", h) } payload := obj.Payload() hashes := make([][]byte, 0, len(prm.rngs)) var hasher hash.Hash switch prm.typ { default: panic(fmt.Sprintf("unexpected checksum type %v", prm.typ)) case pkg.ChecksumSHA256: hasher = sha256.New() case pkg.ChecksumTZ: hasher = tz.New() } for i := range prm.rngs { left := prm.rngs[i].GetOffset() right := left + prm.rngs[i].GetLength() if ln := uint64(len(payload)); ln < right { return errors.Errorf("(%T) object range is out-of-boundaries (size %d, range [%d:%d]", h, ln, left, right) } hasher.Reset() hasher.Write(util.SaltXOR(payload[left:right], prm.salt)) hashes = append(hashes, hasher.Sum(nil)) } handler(hashes) return nil }