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// 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/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/rlp"
)
// DerivableList is the interface which can derive the hash.
type DerivableList interface {
Len() int
GetRlp(i int) []byte
}
// Hasher is the tool used to calculate the hash of derivable list.
type Hasher interface {
Reset()
Update([]byte, []byte)
Hash() common.Hash
}
func DeriveSha(list DerivableList, hasher Hasher) common.Hash {
hasher.Reset()
keybuf := new(bytes.Buffer)
for i := 0; i < list.Len(); i++ {
keybuf.Reset()
rlp.Encode(keybuf, uint(i))
hasher.Update(keybuf.Bytes(), list.GetRlp(i))
}
return hasher.Hash()
}
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