github.com/inphi/go-ethereum@v1.9.7/core/types/derive_sha.go (about) 1 // Copyright 2014 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package types 18 19 import ( 20 "bytes" 21 22 "github.com/ethereum/go-ethereum/common" 23 "github.com/ethereum/go-ethereum/rlp" 24 "github.com/ethereum/go-ethereum/trie" 25 ) 26 27 type DerivableList interface { 28 Len() int 29 GetRlp(i int) []byte 30 } 31 32 func DeriveSha(list DerivableList) common.Hash { 33 keybuf := new(bytes.Buffer) 34 trie := new(trie.Trie) 35 for i := 0; i < list.Len(); i++ { 36 keybuf.Reset() 37 rlp.Encode(keybuf, uint(i)) 38 trie.Update(keybuf.Bytes(), list.GetRlp(i)) 39 } 40 return trie.Hash() 41 }