Openzeppelin Standard Tree Go

Fork @openzeppelin/merkle-tree

A Go library to generate merkle trees and merkle proofs.

Installation

go get github.com/FantasyJony/openzeppelin-merkle-tree-go@v1.1.2

go mod tidy

Example

package main

import (
	"fmt"
	smt "github.com/FantasyJony/openzeppelin-merkle-tree-go/standard_merkle_tree"
	"github.com/ethereum/go-ethereum/common/hexutil"
)

func main() {
    
    values := [][]interface{}{
        {
            smt.SolAddress("0x1111111111111111111111111111111111111111"),
            smt.SolNumber("5000000000000000000"),
        },
        {
            smt.SolAddress("0x2222222222222222222222222222222222222222"),
            smt.SolNumber("2500000000000000000"),
        },
        {
            smt.SolAddress("0x3333333333333333333333333333333333333333"),
            smt.SolNumber("1500000000000000000"),
        },
        {
            smt.SolAddress("0x4444444444444444444444444444444444444444"),
            smt.SolNumber("1000000000000000000"),
        },
    }
    
    leafEncodings := []string{
        smt.SOL_ADDRESS,
        smt.SOL_UINT256,
    }
    
    fmt.Println("=== (1) Of BEGIN ===")
    
    // (1) make tree
    t1, err := smt.Of(values, leafEncodings)
    handleError(err)
    fmt.Println("Root: ", hexutil.Encode(t1.GetRoot()))
    
    fmt.Println("=== (1) Of END ===")
    
    fmt.Println()
    fmt.Println("=== (2) CreateTree BEGIN ===")
    
    // (2.1) create tree
    t2, err := smt.CreateTree(leafEncodings)
    
    // (2.2) add leaf
    fmt.Println("=== (2.2) AddLeaf BEGIN ===")
    for k, v := range values {
        leafHash0, err := t2.AddLeaf(v)
        handleError(err)
        fmt.Println(k, " AddLeaf: ", hexutil.Encode(leafHash0))
    }
    fmt.Println("=== (2.2) AddLeaf END ===")
    
    // (2.3) make tree
    fmt.Println("=== (2.3) MakeTree BEGIN ===")
    r3, err := t2.MakeTree()
    fmt.Println("MakeTree Root: ", hexutil.Encode(r3))
    fmt.Println("=== (2.3) MakeTree END ===")
    
    fmt.Println()
    // (3) dump
    fmt.Println("=== (3) Dump BEGIN ===")
    dump, err := t1.TreeMarshal()
    handleError(err)
    fmt.Println(string(dump))
    fmt.Println("=== (3) Dump END ===")
    
    fmt.Println()
    // (4) load
    fmt.Println("=== (4) Load BEGIN ===")
    t3, err := smt.Load(dump)
    handleError(err)
    
    entries := t3.Entries()
    for k, v := range entries {
        if v.Value[0] == smt.SolAddress("0x1111111111111111111111111111111111111111") {
            proof, err := t3.GetProofWithIndex(k)
            handleError(err)
            fmt.Println(fmt.Sprintf("ValueIndex: %v , TreeIndex: %v , Hash: %v ,  Value: %v", v.ValueIndex, v.TreeIndex, hexutil.Encode(v.Hash), v.Value))
            for pk, pv := range proof {
                fmt.Println(fmt.Sprintf("[%v] = %v", pk, hexutil.Encode(pv)))
            }
        }
    }
	
    fmt.Println("=== (4) Load END ===")
    
    fmt.Println()
    // (5) dump leaf proof
    fmt.Println("=== (5) DumpLeafProof BEGIN ===")
    
    leafProofDump, err := t3.TreeProofMarshal()
    handleError(err)
    fmt.Println(string(leafProofDump))
    fmt.Println("=== (5) DumpLeafProof END ===")
    
    fmt.Println()
    // (6) verify proof
    fmt.Println("=== (6) Verify BEGIN ===")
    firstProof, err := t3.GetProofWithIndex(0)
    handleError(err)
    firstValue := entries[0].Value
    
    verified, err := t3.Verify(firstProof, firstValue)
    handleError(err)
    fmt.Println("Verify:", verified)
    fmt.Println("=== (6) Verify END ===")
    
    fmt.Println()
    // (7)
    fmt.Println("=== (7) VerifyMultiProof BEGIN ===")
    mulitProof, err := t3.GetMultiProof([][]interface{}{values[0], values[1]})
	
    fmt.Println("Proof:")
    for k, v := range mulitProof.Proof {
        fmt.Println(fmt.Sprintf("[%v] = %v", k, hexutil.Encode(v)))
    }
	
    fmt.Println("ProofFlags:")
    fmt.Println(mulitProof.ProofFlags)
    
    fmt.Println("Values:")
    for _, v := range mulitProof.Values {
        fmt.Println(v)
    }
    
    verified, err = t3.VerifyMultiProof(mulitProof)
    handleError(err)
    fmt.Println("Verify:", verified)
    
    fmt.Println("=== (7) VerifyMultiProof END ===")
}

func handleError(err error) {
    if err != nil {
        panic(err)
    }
}

Run: main_run.txt

Dump

TreeMarshal: dump_tree.json

TreeProofMarshal: dump_proof.json

Solidity

Example merkle-tree-contracts

Hardhat

cd merkle-tree-contracts
npm install
npx hardhat test

Go API

import smt

import (
	smt "github.com/FantasyJony/openzeppelin-merkle-tree-go/standard_merkle_tree"
	"github.com/ethereum/go-ethereum/common/hexutil"
)

smt.Of

// Of
tree, err := smt.Of(
    [][]interface{}{
        {
            smt.SolAddress("0x1111111111111111111111111111111111111111"),
            smt.SolNumber("5000000000000000000"),
        },
        {
            smt.SolAddress("0x2222222222222222222222222222222222222222"),
            smt.SolNumber("2500000000000000000"),
        },
    },
    []string {
        smt.SOL_ADDRESS,
        smt.SOL_UINT256,
    },
)

smt.CreateTree

tree, err := smt.CreateTree([]string{smt.SOL_ADDRESS, smt.SOL_UINT256})

smt.Verify

// root
rootHash, err := hexutil.Decode("0xd4dee0beab2d53f2cc83e567171bd2820e49898130a22622b10ead383e90bd77")
if err != nil {
    fmt.Println(err)
}

// proof
pv, err := hexutil.Decode("0xb92c48e9d7abe27fd8dfd6b5dfdbfb1c9a463f80c712b66f3a5180a090cccafc")
proof := [][]byte{
    pv,
}


// leafEncodings
leafEncodings := []string {
    smt.SOL_ADDRESS,
    smt.SOL_UINT256,
}

// value
value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}

// leaf
leafHah, err := LeafHash(leafEncodings, value)
if err != nil {
    fmt.Println(err)
}

// Verify
verified, err := smt.Verify(rootHash, leafHah, proof)

smt.VerifyMultiProof

// root
root, err := hexutil.Decode("0xd4dee0beab2d53f2cc83e567171bd2820e49898130a22622b10ead383e90bd77")
if err != nil {
    fmt.Println(err)
}

leafEncodings := []string{
    smt.SOL_ADDRESS,
    smt.SOL_UINT256,
}

value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}

// leaf
leaf1, err := smt,LeafHash(leafEncodings, value)
if err != nil {
    fmt.Println(err)
}

leaves := [][]byte{
    leaf1,
}

// proof
proofValue01, err := hexutil.Decode("0xb92c48e9d7abe27fd8dfd6b5dfdbfb1c9a463f80c712b66f3a5180a090cccafc")
if err != nil {
    fmt.Println(err)
}
proof := [][]byte{
    proofValue01,
}

// proofFlags
proofFlags := []bool{
    false,
}

// multiProof
multiProof := &smt.MultiProof{
    Proof:      proof,
    ProofFlags: proofFlags,
    Leaves:     leaves,
}

// VerifyMultiProof
verified, err := smt.VerifyMultiProof(root, multiProof)

smt.Load

value := "{\"format\":\"standard-v1\",\"tree\":[\"0xd4dee0beab2d53f2cc83e567171bd2820e49898130a22622b10ead383e90bd77\",\"0xeb02c421cfa48976e66dfb29120745909ea3a0f843456c263cf8f1253483e283\",\"0xb92c48e9d7abe27fd8dfd6b5dfdbfb1c9a463f80c712b66f3a5180a090cccafc\"],\"values\":[{\"value\":[\"0x1111111111111111111111111111111111111111\",\"5000000000000000000\"],\"treeIndex\":1},{\"value\":[\"0x2222222222222222222222222222222222222222\",\"2500000000000000000\"],\"treeIndex\":2}],\"leafEncoding\":[\"address\",\"uint256\"]}"
tree , err := smt.Load([]byte(value))

tree.AddLeaf

value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}
leafHash, err := tree.AddLeaf(value)

tree.MakeTree

rootHash, err := tree.MakeTree()

tree.GetRoot

rootHash := tree.GetRoot()
rootHashValue , err := hexutil.Encode(rootHash)

tree.Dump or tree.TreeMarshal

treeData := tree.Dump()
jsonValue, err := json.Marshal(treeData)

or

jsonValue, err := tree.TreeMarshal()

tree.GetProof

value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}
proof, err := tree.GetProof(value)

tree.GetProofWithIndex

proof, err := tree.GetProofWithIndex(0)

tree.GetMultiProof

value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}

leaves := [][]interface{}{
    value,
}

multiProof, err := tree.GetMultiProof(leaves)

tree.GetMultiProofWithIndices

indices := []int{
    0,
}
multiProof, err := tree.GetMultiProofWithIndices(indices)

tree.Verify

value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}
verified, err := tree.Verify(proof, value)

tree.VerifyWithIndex

verified, err := tree.VerifyWithIndex(proof, 0)

tree.VerifyMultiProof

verified, err := tree.VerifyMultiProof(multiProof)

tree.Entries

entries := tree.Entries()
for k, v := range entries {
    fmt.Println("ValueIndex:", v.ValueIndex, " TreeIndex:", v.TreeIndex, " Hash:", hexutil.Encode(v.Hash), " Value:", v.Value)
    proof, err := tree.GetProofWithIndex(k)
    for pk, pv := range proof {
        fmt.Println("Proof k:", pk, " v:", hexutil.Encode(pv))
    }
}

tree.LeafHash

value := []interface{}{
    smt.SolAddress("0x1111111111111111111111111111111111111111"),
    smt.SolNumber("5000000000000000000"),
}
leafHash, err := tree.LeafHash(value)