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Merge pull request #232 from OffchainLabs/merge-v1.12.0
Merge v1.12.0
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// Copyright 2022 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 merkle implements proof verifications in binary merkle trees. | ||
package merkle | ||
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import ( | ||
"crypto/sha256" | ||
"errors" | ||
"reflect" | ||
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"github.com/ethereum/go-ethereum/common" | ||
"github.com/ethereum/go-ethereum/common/hexutil" | ||
) | ||
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// Value represents either a 32 byte leaf value or hash node in a binary merkle tree/partial proof. | ||
type Value [32]byte | ||
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// Values represent a series of merkle tree leaves/nodes. | ||
type Values []Value | ||
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var valueT = reflect.TypeOf(Value{}) | ||
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// UnmarshalJSON parses a merkle value in hex syntax. | ||
func (m *Value) UnmarshalJSON(input []byte) error { | ||
return hexutil.UnmarshalFixedJSON(valueT, input, m[:]) | ||
} | ||
|
||
// VerifyProof verifies a Merkle proof branch for a single value in a | ||
// binary Merkle tree (index is a generalized tree index). | ||
func VerifyProof(root common.Hash, index uint64, branch Values, value Value) error { | ||
hasher := sha256.New() | ||
for _, sibling := range branch { | ||
hasher.Reset() | ||
if index&1 == 0 { | ||
hasher.Write(value[:]) | ||
hasher.Write(sibling[:]) | ||
} else { | ||
hasher.Write(sibling[:]) | ||
hasher.Write(value[:]) | ||
} | ||
hasher.Sum(value[:0]) | ||
if index >>= 1; index == 0 { | ||
return errors.New("branch has extra items") | ||
} | ||
} | ||
if index != 1 { | ||
return errors.New("branch is missing items") | ||
} | ||
if common.Hash(value) != root { | ||
return errors.New("root mismatch") | ||
} | ||
return nil | ||
} |
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