1 files changed, 41 insertions, 0 deletions
diff --git a/core/types/derive_sha.go b/core/types/derive_sha.go
new file mode 100644
index 0000000..8234191
--- /dev/null
+++ b/core/types/derive_sha.go
@@ -0,0 +1,41 @@
+// Copyright 2014 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 types
+
+import (
+	"bytes"
+
+	"github.com/ava-labs/go-ethereum/common"
+	"github.com/ava-labs/go-ethereum/rlp"
+	"github.com/ava-labs/go-ethereum/trie"
+)
+
+type DerivableList interface {
+	Len() int
+	GetRlp(i int) []byte
+}
+
+func DeriveSha(list DerivableList) common.Hash {
+	keybuf := new(bytes.Buffer)
+	trie := new(trie.Trie)
+	for i := 0; i < list.Len(); i++ {
+		keybuf.Reset()
+		rlp.Encode(keybuf, uint(i))
+		trie.Update(keybuf.Bytes(), list.GetRlp(i))
+	}
+	return trie.Hash()
+}