1 files changed, 42 insertions, 0 deletions
diff --git a/swarm/storage/mru/resource_sign.go b/swarm/storage/mru/resource_sign.go
new file mode 100644
index 000000000..c6185a3bb
--- /dev/null
+++ b/swarm/storage/mru/resource_sign.go
@@ -0,0 +1,42 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package mru
+
+import (
+	"crypto/ecdsa"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// Signs resource updates
+type Signer interface {
+	Sign(common.Hash) (Signature, error)
+}
+
+type GenericSigner struct {
+	PrivKey *ecdsa.PrivateKey
+}
+
+func (self *GenericSigner) Sign(data common.Hash) (signature Signature, err error) {
+	signaturebytes, err := crypto.Sign(data.Bytes(), self.PrivKey)
+	if err != nil {
+		return
+	}
+	copy(signature[:], signaturebytes)
+	return
+}