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nmt_test.go
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package nmt
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/sha256"
"encoding/binary"
"errors"
"fmt"
"math"
"reflect"
"sort"
"sync"
"testing"
"github.com/stretchr/testify/require"
"github.com/celestiaorg/nmt/namespace"
"github.com/stretchr/testify/assert"
)
// prefixedData8 like namespace.PrefixedData is just a slice of bytes. It
// assumes that the slice it represents is at least 8 bytes. This assumption is
// not enforced by the type system though.
type prefixedData8 []byte
func (d prefixedData8) NamespaceID() namespace.ID {
return namespace.ID(d[:8])
}
func (d prefixedData8) Data() []byte {
return d[8:]
}
type namespaceDataPair struct {
ID namespace.ID
Data []byte
}
func newNamespaceDataPair(id namespace.ID, data []byte) namespaceDataPair {
return namespaceDataPair{
ID: id,
Data: data,
}
}
func newNamespaceDataPairRaw(nidSize int, data []byte) namespaceDataPair {
return namespaceDataPair{
ID: data[:nidSize],
Data: data[nidSize:],
}
}
func TestExampleNamespacedMerkleTree(t *testing.T) {
data := [][]byte{
append(namespace.ID{0}, []byte("leaf_0")...),
append(namespace.ID{0}, []byte("leaf_1")...),
append(namespace.ID{1}, []byte("leaf_2")...),
append(namespace.ID{1}, []byte("leaf_3")...),
}
nidSize := 1
tree := New(sha256.New(), NamespaceIDSize(nidSize))
for _, d := range data {
err := tree.Push(d)
assert.NoError(t, err)
}
root, err := tree.Root()
assert.NoError(t, err)
// the root's min/max namespace is the min and max namespace of all leaves:
minNS := MinNamespace(root, tree.NamespaceSize())
maxNS := MaxNamespace(root, tree.NamespaceSize())
assert.Equal(t, minNS, []byte(namespace.ID{0}))
assert.Equal(t, maxNS, []byte(namespace.ID{1}))
// compute proof for namespace 0
proof, err := tree.ProveNamespace(namespace.ID{0})
assert.NoError(t, err)
// verify proof using the root and the leaves of namespace 0
leafs := [][]byte{
append(namespace.ID{0}, []byte("leaf_0")...),
append(namespace.ID{0}, []byte("leaf_1")...),
}
got := proof.VerifyNamespace(sha256.New(), namespace.ID{0}, leafs, root)
assert.True(t, got)
got = proof.VerifyNamespace(sha256.New(), namespace.ID{2}, leafs, root)
assert.False(t, got) // namespace 2 is not in the tree, so the proof should fail to verify
}
func TestNamespacedMerkleTree_Push(t *testing.T) {
tests := []struct {
name string
data namespace.PrefixedData
wantErr bool
}{
{"1st push: always OK", append([]byte{0, 0, 0}, []byte("dummy data")...), false},
{"push with same namespace: OK", append([]byte{0, 0, 0}, []byte("dummy data")...), false},
{"push with greater namespace: OK", append([]byte{0, 0, 1}, []byte("dummy data")...), false},
{"push with smaller namespace: Err", append([]byte{0, 0, 0}, []byte("dummy data")...), true},
{"push with same namespace: Ok", append([]byte{0, 0, 1}, []byte("dummy data")...), false},
{"push with greater namespace: Ok", append([]byte{1, 0, 0}, []byte("dummy data")...), false},
{"push with smaller namespace: Err", append([]byte{0, 0, 1}, []byte("dummy data")...), true},
{"push with smaller namespace: Err", append([]byte{0, 0, 0}, []byte("dummy data")...), true},
{"push with smaller namespace: Err", append([]byte{0, 1, 0}, []byte("dummy data")...), true},
{"push with same as last namespace: OK", append([]byte{1, 0, 0}, []byte("dummy data")...), false},
{"push with greater as last namespace: OK", append([]byte{1, 1, 0}, []byte("dummy data")...), false},
// This will error, as the NMT will treat the first bytes as the namespace. If the passed data is
// too short though, it can't extract the namespace and hence will complain:
{"push with wrong namespace size: Err", []byte{1, 1}, true},
}
n := New(sha256.New(), NamespaceIDSize(3))
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if err := n.Push(tt.data); (err != nil) != tt.wantErr {
t.Errorf("Push() error = %v, wantErr %v", err, tt.wantErr)
}
})
}
}
func TestNamespacedMerkleTreeRoot(t *testing.T) {
// does some sanity checks on root computation
zeroNs := []byte{0, 0, 0}
onesNS := []byte{1, 1, 1}
leafData := []byte("leaf1")
zeroLeafHash := sum(crypto.SHA256, []byte{LeafPrefix}, zeroNs, leafData)
oneLeafHash := sum(crypto.SHA256, []byte{LeafPrefix}, onesNS, leafData)
zeroFlaggedLeaf := append(append(zeroNs, zeroNs...), zeroLeafHash...)
oneFlaggedLeaf := append(append(onesNS, onesNS...), oneLeafHash...)
twoZeroLeafsRoot := sum(crypto.SHA256, []byte{NodePrefix}, zeroFlaggedLeaf, zeroFlaggedLeaf)
diffNSLeafsRoot := sum(crypto.SHA256, []byte{NodePrefix}, zeroFlaggedLeaf, oneFlaggedLeaf)
emptyRoot := crypto.SHA256.New().Sum(nil)
tests := []struct {
name string
nidLen int
pushedData []namespaceDataPair
wantRoot []byte
}{
// default empty root according to base case:
// https://github.com/celestiaorg/celestiaorg-specs/blob/master/specs/data_structures.md#namespace-merkle-tree
{"Empty", 3, nil, appendAll(zeroNs, zeroNs, emptyRoot)},
{"One leaf", 3, []namespaceDataPair{newNamespaceDataPair(zeroNs, leafData)}, appendAll(zeroNs, zeroNs, sum(crypto.SHA256, []byte{LeafPrefix}, zeroNs, leafData))},
{"Two leaves", 3, []namespaceDataPair{newNamespaceDataPair(zeroNs, leafData), newNamespaceDataPair(zeroNs, leafData)}, appendAll(zeroNs, zeroNs, twoZeroLeafsRoot)},
{"Two leaves diff namespaces", 3, []namespaceDataPair{newNamespaceDataPair(zeroNs, leafData), newNamespaceDataPair(onesNS, leafData)}, appendAll(zeroNs, onesNS, diffNSLeafsRoot)},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
n := New(sha256.New(), NamespaceIDSize(tt.nidLen))
for _, d := range tt.pushedData {
if err := n.Push(namespace.PrefixedData(append(d.ID, d.Data...))); err != nil {
t.Errorf("Push() error = %v, expected no error", err)
}
}
gotRoot, err := n.Root()
require.NoError(t, err)
if !reflect.DeepEqual(gotRoot, tt.wantRoot) {
t.Errorf("Root() gotRoot = %v, want %v", gotRoot, tt.wantRoot)
}
})
}
}
func appendAll(slices ...[]byte) []byte {
totalLen := 0
for _, slice := range slices {
totalLen += len(slice)
}
out := make([]byte, 0, totalLen)
for _, slice := range slices {
out = append(out, slice...)
}
return out
}
func TestNamespacedMerkleTree_ProveNamespace_Ranges_And_Verify(t *testing.T) {
tests := []struct {
name string
nidLen int
pushData []namespaceDataPair
proveNID namespace.ID
wantProofStart int
wantProofEnd int
wantFound bool
}{
{
"found", 1,
generateLeafData(1, 0, 1, []byte("_data")),
[]byte{0},
0, 1,
true,
},
{
"not found", 1,
generateLeafData(1, 0, 1, []byte("_data")),
[]byte{1},
0, 0,
false,
},
{
"two leaves and found", 1,
append(generateLeafData(1, 0, 1, []byte("_data")), generateLeafData(1, 1, 2, []byte("_data"))...),
[]byte{1},
1, 2,
true,
},
{
"two leaves and found2", 1,
repeat(generateLeafData(1, 0, 1, []byte("_data")), 2),
[]byte{1},
0, 0, false,
},
{
"three leaves and found", 1,
append(repeat(generateLeafData(1, 0, 1, []byte("_data")), 2), generateLeafData(1, 1, 2, []byte("_data"))...),
[]byte{1},
2, 3,
true,
},
{
"three leaves and not found but with range", 2,
append(repeat(generateLeafData(2, 0, 1, []byte("_data")), 2), newNamespaceDataPair([]byte{1, 1}, []byte("_data"))),
[]byte{0, 1},
2, 3,
false,
},
{
"5 leaves and not found but within range", 2,
append(generateLeafData(2, 0, 4, []byte("_data")), newNamespaceDataPair([]byte{1, 1}, []byte("_data"))),
[]byte{1, 0},
4, 5,
false,
},
// In the cases (nID < minNID) or (maxNID < nID) we do not generate any proof
// and the (minNS, maxNs, root) should be indication enough that nID is not in that range.
{
"4 leaves, not found and nID < minNID", 2,
[]namespaceDataPair{newNamespaceDataPairRaw(2, []byte("01_data")), newNamespaceDataPairRaw(2, []byte("01_data")), newNamespaceDataPairRaw(2, []byte("01_data")), newNamespaceDataPairRaw(2, []byte("11_data"))},
[]byte("00"),
0, 0,
false,
},
{
"4 leaves, not found and nID > maxNID ", 2,
[]namespaceDataPair{newNamespaceDataPairRaw(2, []byte("00_data")), newNamespaceDataPairRaw(2, []byte("00_data")), newNamespaceDataPairRaw(2, []byte("01_data")), newNamespaceDataPairRaw(2, []byte("01_data"))},
[]byte("11"),
0, 0,
false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
n := New(sha256.New(), NamespaceIDSize(tt.nidLen))
for _, d := range tt.pushData {
err := n.Push(namespace.PrefixedData(append(d.ID, d.Data...)))
if err != nil {
t.Fatalf("invalid test case: %v, error on Push(): %v", tt.name, err)
}
}
gotProof, err := n.ProveNamespace(tt.proveNID)
if err != nil {
t.Fatalf("ProveNamespace() unexpected error: %v", err)
}
if gotProof.Start() != tt.wantProofStart {
t.Errorf("ProveNamespace() gotProofStart = %v, want %v", gotProof.Start(), tt.wantProofStart)
}
if gotProof.End() != tt.wantProofEnd {
t.Errorf("ProveNamespace() gotProofEnd = %v, want %v", gotProof.End(), tt.wantProofEnd)
}
gotFound := gotProof.IsNonEmptyRange() && len(gotProof.LeafHash()) == 0
if gotFound != tt.wantFound {
t.Errorf("Proof.ProveNamespace() gotFound = %v, wantFound = %v ", gotFound, tt.wantFound)
}
if gotFound && len(tt.pushData) > 1 && len(gotProof.Nodes()) == 0 {
t.Errorf("Proof.Nodes() returned empty array, want: len(gotProof.Nodes()) > 0, gotProof: %v", gotProof)
}
// Verification round-trip should always pass:
gotGetLeaves := n.Get(tt.proveNID)
r, err := n.Root()
require.NoError(t, err)
gotChecksOut := gotProof.VerifyNamespace(sha256.New(), tt.proveNID, gotGetLeaves, r)
if !gotChecksOut {
t.Errorf("Proof.VerifyNamespace() gotChecksOut: %v, want: true", gotChecksOut)
}
// VerifyInclusion for each pushed leaf should always pass:
if !gotProof.IsOfAbsence() && tt.wantFound {
for idx, data := range tt.pushData {
gotSingleProof, err := n.Prove(idx)
if err != nil {
t.Fatalf("unexpected error on Prove(): %v", err)
}
r, err := n.Root()
require.NoError(t, err)
gotChecksOut := gotSingleProof.VerifyInclusion(sha256.New(), data.ID, [][]byte{data.Data}, r)
if !gotChecksOut {
t.Errorf("Proof.VerifyInclusion() gotChecksOut: %v, want: true", gotChecksOut)
}
}
}
// GetWithProof equiv. to Get and ProveNamespace
gotGetWithProoftLeaves, gotGetProof, err := n.GetWithProof(tt.proveNID)
if err != nil {
t.Fatalf("GetWithProof() unexpected error: %v", err)
}
if !reflect.DeepEqual(gotGetProof, gotProof) {
t.Fatalf("GetWithProof() got Proof %v, want: %v", gotGetProof, gotProof)
}
if !reflect.DeepEqual(gotGetWithProoftLeaves, gotGetLeaves) {
t.Fatalf("GetWithProof() got data: %v, want: %v", gotGetLeaves, tt.pushData)
}
})
}
}
func TestIgnoreMaxNamespace(t *testing.T) {
var (
hash = sha256.New()
nidSize = 8
minNID = []byte{0, 0, 0, 0, 0, 0, 0, 0}
secondNID = []byte{0, 0, 0, 0, 0, 0, 0, 1}
thirdNID = []byte{0, 0, 0, 0, 0, 0, 0, 2}
maxNID = []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}
)
tests := []struct {
name string
ignoreMaxNamespace bool
pushData []prefixedData8
wantRootMaxNID namespace.ID
}{
{
"single leaf with MaxNID (ignored)",
true,
[]prefixedData8{prefixedData8(append(maxNID, []byte("leaf_1")...))},
maxNID,
},
{
"single leaf with MaxNID (not ignored)",
false,
[]prefixedData8{prefixedData8(append(maxNID, []byte("leaf_1")...))},
maxNID,
},
{
"two leaves, one with MaxNID (ignored)",
true,
[]prefixedData8{
prefixedData8(append(secondNID, []byte("leaf_1")...)),
prefixedData8(append(maxNID, []byte("leaf_2")...)),
},
secondNID,
},
{
"two leaves, one with MaxNID (not ignored)",
false,
[]prefixedData8{
prefixedData8(append(secondNID, []byte("leaf_1")...)),
prefixedData8(append(maxNID, []byte("leaf_2")...)),
},
maxNID,
},
{
"two leaves with MaxNID (ignored)",
true,
[]prefixedData8{
prefixedData8(append(maxNID, []byte("leaf_1")...)),
prefixedData8(append(maxNID, []byte("leaf_2")...)),
},
maxNID,
},
{
"two leaves with MaxNID (not ignored)",
false,
[]prefixedData8{
prefixedData8(append(maxNID, []byte("leaf_1")...)),
prefixedData8(append(maxNID, []byte("leaf_2")...)),
},
maxNID,
},
{
"two leaves, none with MaxNID (ignored)",
true,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
},
secondNID,
},
{
"two leaves, none with MaxNID (not ignored)",
false,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
},
secondNID,
},
{
"three leaves, one with MaxNID (ignored)",
true,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
prefixedData8(append(maxNID, []byte("leaf_2")...)),
},
secondNID,
},
{
"three leaves, one with MaxNID (not ignored)",
false,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
prefixedData8(append(maxNID, []byte("leaf_2")...)),
},
maxNID,
},
{
"4 leaves, none maxNID (ignored)", true,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(minNID, []byte("leaf_2")...)),
prefixedData8(append(secondNID, []byte("leaf_3")...)),
prefixedData8(append(thirdNID, []byte("leaf_4")...)),
},
thirdNID,
},
{
"4 leaves, half maxNID (ignored)",
true,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
prefixedData8(append(maxNID, []byte("leaf_3")...)),
prefixedData8(append(maxNID, []byte("leaf_4")...)),
},
secondNID,
},
{
"4 leaves, half maxNID (not ignored)",
false,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
prefixedData8(append(maxNID, []byte("leaf_3")...)),
prefixedData8(append(maxNID, []byte("leaf_4")...)),
},
maxNID,
},
{
"8 leaves, 4 maxNID (ignored)",
true,
[]prefixedData8{
prefixedData8(append(minNID, []byte("leaf_1")...)),
prefixedData8(append(secondNID, []byte("leaf_2")...)),
prefixedData8(append(thirdNID, []byte("leaf_3")...)),
prefixedData8(append(thirdNID, []byte("leaf_4")...)),
prefixedData8(append(maxNID, []byte("leaf_5")...)),
prefixedData8(append(maxNID, []byte("leaf_6")...)),
prefixedData8(append(maxNID, []byte("leaf_7")...)),
prefixedData8(append(maxNID, []byte("leaf_8")...)),
},
thirdNID,
},
}
for i, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
tree := New(hash, NamespaceIDSize(nidSize), IgnoreMaxNamespace(tc.ignoreMaxNamespace))
for _, d := range tc.pushData {
if err := tree.Push(namespace.PrefixedData(d)); err != nil {
panic("unexpected error")
}
}
r, err := tree.Root()
require.NoError(t, err)
gotRootMaxNID := r[tree.NamespaceSize() : tree.NamespaceSize()*2]
if !bytes.Equal(tc.wantRootMaxNID, gotRootMaxNID) {
t.Fatalf("Case: %v, '%v', root.Max() got: %x, want: %x", i, tc.name, gotRootMaxNID, tc.wantRootMaxNID)
}
for idx, d := range tc.pushData {
proof, err := tree.ProveNamespace(d.NamespaceID())
if err != nil {
t.Fatalf("ProveNamespace() unexpected error: %v", err)
}
if gotIgnored := proof.IsMaxNamespaceIDIgnored(); gotIgnored != tc.ignoreMaxNamespace {
t.Fatalf("Proof.IsMaxNamespaceIDIgnored() got: %v, want: %v", gotIgnored, tc.ignoreMaxNamespace)
}
var leaves [][]byte
if !proof.IsEmptyProof() {
leaves = tree.Get(d.NamespaceID())
}
r, err := tree.Root()
require.NoError(t, err)
if !proof.VerifyNamespace(hash, d.NamespaceID(), leaves, r) {
t.Errorf("VerifyNamespace() failed on ID: %x", d.NamespaceID())
}
singleProof, err := tree.Prove(idx)
if err != nil {
t.Fatalf("ProveNamespace() unexpected error: %v", err)
}
r, err = tree.Root()
require.NoError(t, err)
if !singleProof.VerifyInclusion(hash, d.NamespaceID(), [][]byte{d.Data()}, r) {
t.Errorf("VerifyInclusion() failed on leaves: %#v with index: %v", d, idx)
}
if gotIgnored := singleProof.IsMaxNamespaceIDIgnored(); gotIgnored != tc.ignoreMaxNamespace {
t.Fatalf("Proof.IsMaxNamespaceIDIgnored() got: %v, want: %v", gotIgnored, tc.ignoreMaxNamespace)
}
}
})
}
}
func TestNodeVisitor(t *testing.T) {
const (
numLeaves = 4
nidSize = 2
leafSize = 6
)
nodeHashes := make([][]byte, 0)
collectNodeHashes := func(hash []byte, _ ...[]byte) {
nodeHashes = append(nodeHashes, hash)
}
data, err := generateRandNamespacedRawData(numLeaves, nidSize, leafSize)
require.NoError(t, err)
n := New(sha256.New(), NamespaceIDSize(nidSize), NodeVisitor(collectNodeHashes))
for j := 0; j < numLeaves; j++ {
if err := n.Push(data[j]); err != nil {
t.Errorf("err: %v", err)
}
}
root, err := n.Root()
require.NoError(t, err)
last := nodeHashes[len(nodeHashes)-1]
if !bytes.Equal(root, last) {
t.Fatalf("last visited node's digest does not match the tree root's.")
}
t.Log("printing nodes in visiting order") // postorder DFS
for _, nodeHash := range nodeHashes {
t.Logf("|min: %x, max: %x, digest: %x...|\n", nodeHash[:nidSize], nodeHash[nidSize:nidSize*2], nodeHash[nidSize*2:nidSize*2+3])
}
}
func TestCustomHasher(t *testing.T) {
type customHasher struct {
*NmtHasher
}
h := customHasher{NewNmtHasher(sha256.New(), namespace.IDSize(8), true)}
tree := New(sha256.New(), NamespaceIDSize(8), IgnoreMaxNamespace(true), CustomHasher(h))
_, ok := tree.treeHasher.(customHasher)
require.True(t, ok)
}
func TestNamespacedMerkleTree_ProveErrors(t *testing.T) {
tests := []struct {
name string
nidLen int
index int
pushData []namespaceDataPair
wantErr bool
}{
{"negative index", 1, -1, generateLeafData(1, 0, 10, []byte("_data")), true},
{"too large index", 1, 11, generateLeafData(1, 0, 10, []byte("_data")), true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
n := New(sha256.New(), NamespaceIDSize(tt.nidLen), InitialCapacity(len(tt.pushData)))
for _, d := range tt.pushData {
err := n.Push(namespace.PrefixedData(append(d.ID, d.Data...)))
if err != nil {
t.Fatalf("invalid test case: %v, error on Push(): %v", tt.name, err)
}
}
for i := range tt.pushData {
_, err := n.Prove(i)
if err != nil {
t.Fatalf("Prove() failed on valid index: %v, err: %v", i, err)
}
}
_, err := n.Prove(tt.index)
if (err != nil) != tt.wantErr {
t.Errorf("Prove() error = %v, wantErr %v", err, tt.wantErr)
return
}
})
}
}
func TestNamespacedMerkleTree_calculateAbsenceIndex_Panic(t *testing.T) {
const nidLen = 2
tests := []struct {
name string
nID namespace.ID
pushData []namespaceDataPair
}{
{"empty tree", []byte{0, 0}, []namespaceDataPair{}},
{"non-empty tree with 2 leaves: ((0,0) == nID < minNID == (0,1))", []byte{0, 0}, generateLeafData(nidLen, 1, 3, []byte{})},
{"non-empty tree with 2 leaves: ((0,3) == nID > maxNID == (0,2))", []byte{0, 3}, generateLeafData(nidLen, 1, 3, []byte{})},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
n := New(sha256.New(), NamespaceIDSize(2))
for _, d := range tt.pushData {
err := n.Push(namespace.PrefixedData(append(d.ID, d.Data...)))
assert.NoError(t, err)
}
shouldPanic(t,
func() { n.calculateAbsenceIndex(tt.nID) })
})
}
}
// This test checks for a regression of https://github.com/celestiaorg/nmt/issues/86
func TestNMT_absenceProofOfZeroNamespace_InEmptyTree(t *testing.T) {
tree := New(sha256.New(), NamespaceIDSize(1))
root, err := tree.Root()
require.NoError(t, err)
emptyleaves, proof, err := tree.GetWithProof(namespace.ID{0})
if err != nil {
t.Fatalf("GetWithProof() could not get namespace{0}. err: %v ", err)
}
if len(emptyleaves) != 0 {
t.Fatalf("Get(namespace.ID{0}) should have returned no leaves but returned %v", emptyleaves)
}
if !proof.VerifyNamespace(sha256.New(), namespace.ID{0}, emptyleaves, root) {
t.Fatalf("Could not verify proof of absence of namespace zero in empty tree")
}
}
// This test checks for a regression of https://github.com/celestiaorg/nmt/issues/86
func TestNMT_forgedNamespaceEmptinessProof(t *testing.T) {
data := [][]byte{
append(namespace.ID{1}, []byte("leaf_0")...),
append(namespace.ID{1}, []byte("leaf_1")...),
append(namespace.ID{2}, []byte("leaf_2")...),
append(namespace.ID{2}, []byte("leaf_3")...),
}
// Init a tree with the namespace size as well as
// the underlying hash function:
tree := New(sha256.New(), NamespaceIDSize(1))
for _, d := range data {
if err := tree.Push(d); err != nil {
panic(fmt.Sprintf("unexpected error: %v", err))
}
}
root, err := tree.Root()
require.NoError(t, err)
actualLeaves := tree.Get(namespace.ID{1})
if len(actualLeaves) == 0 {
t.Fatalf("Get(namespace.ID{1}) should have returned two leaves but returned none.")
}
forgedProof := Proof{
start: 0,
end: 0,
nodes: [][]byte{},
leafHash: []byte{},
isMaxNamespaceIDIgnored: true,
}
forgedProofSuccess := forgedProof.VerifyNamespace(sha256.New(), namespace.ID{1}, [][]byte{}, root)
if forgedProofSuccess {
t.Fatalf("Successfully verified proof that non-empty namespace was empty")
}
}
func TestInvalidOptions(t *testing.T) {
shouldPanic(t, func() {
_ = New(sha256.New(), InitialCapacity(-1))
})
shouldPanic(t, func() {
_ = New(sha256.New(), NamespaceIDSize(-1))
})
shouldPanic(t, func() {
_ = New(sha256.New(), NamespaceIDSize(namespace.IDMaxSize+1))
})
}
func BenchmarkComputeRoot(b *testing.B) {
b.ReportAllocs()
tests := []struct {
name string
numLeaves int
nidSize int
dataSize int
}{
{"64-leaves", 64, 8, 256},
{"128-leaves", 128, 8, 256},
{"256-leaves", 256, 8, 256},
{"20k-leaves", 20000, 8, 512},
}
for _, tt := range tests {
data, err := generateRandNamespacedRawData(tt.numLeaves, tt.nidSize, tt.dataSize)
require.NoError(b, err)
b.ResetTimer()
b.Run(tt.name, func(b *testing.B) {
for i := 0; i < b.N; i++ {
n := New(sha256.New())
for j := 0; j < tt.numLeaves; j++ {
if err := n.Push(data[j]); err != nil {
b.Errorf("err: %v", err)
}
}
_, _ = n.Root()
}
})
}
}
func Test_Root_RaceCondition(t *testing.T) {
// this is very similar to: https://github.com/HuobiRDCenter/huobi_Golang/pull/9
tree := New(sha256.New())
_ = tree.Push([]byte("some data is good enough here"))
numRoutines := 200
wg := sync.WaitGroup{}
wg.Add(numRoutines)
for i := 0; i < numRoutines; i++ {
go func() {
defer func() {
if r := recover(); r != nil {
t.Errorf("race condition: panic %s", r)
}
wg.Done()
}()
_, err := tree.Root()
require.NoError(t, err)
}()
}
wg.Wait()
}
func shouldPanic(t *testing.T, f func()) {
//nolint:errcheck
defer func() { recover() }()
f()
t.Errorf("should have panicked")
}
// generates a consecutive range of leaf data
// starting from namespace zero+nsStartIdx till zero+nsEndIdx-1,
// where zero := 0*nsLen interpreted Uvarint
func generateLeafData(nsLen uint8, nsStartIdx, nsEndIdx int, data []byte) []namespaceDataPair {
if nsEndIdx >= math.MaxUint8*int(nsLen) {
panic(fmt.Sprintf("invalid nsEndIdx: %v, has to be < %v", nsEndIdx, 2<<(nsLen-1)))
}
startNS := bytes.Repeat([]byte{0x0}, int(nsLen))
res := make([]namespaceDataPair, 0, nsEndIdx-nsStartIdx)
for i := nsStartIdx; i < nsEndIdx; i++ {
curNs := append([]byte(nil), startNS...)
curNsUint, err := binary.ReadUvarint(bytes.NewReader(startNS))
if err != nil {
panic(err)
}
curNsUint = curNsUint + uint64(i)
nsUnpadded := make([]byte, 10)
n := binary.PutUvarint(nsUnpadded, curNsUint)
copy(curNs[len(startNS)-n:], nsUnpadded[:n])
res = append(res, newNamespaceDataPair(curNs, data))
}
return res
}
// repeats the given namespace data num times
func repeat(data []namespaceDataPair, num int) []namespaceDataPair {
res := make([]namespaceDataPair, 0, num*len(data))
for i := 0; i < num; i++ {
res = append(res, data...)
}
return res
}
func generateRandNamespacedRawData(total int, nidSize int, leafSize int) ([][]byte, error) {
data := make([][]byte, total)
for i := 0; i < total; i++ {
nid := make([]byte, nidSize)
_, err := rand.Read(nid)
if err != nil {
return nil, err
}
data[i] = nid
}
sortByteArrays(data)
for i := 0; i < total; i++ {
d := make([]byte, leafSize)
_, err := rand.Read(d)
if err != nil {
return nil, err
}
data[i] = append(data[i], d...)
}
return data, nil
}
func sortByteArrays(src [][]byte) {
sort.Slice(src, func(i, j int) bool { return bytes.Compare(src[i], src[j]) < 0 })
}
func TestMinMaxNamespace(t *testing.T) {
type testCase struct {
name string
tree *NamespacedMerkleTree
wantMin namespace.ID
wantMax namespace.ID
}
testCases := []testCase{
{
name: "example tree with four leaves",
tree: exampleNMT(1, true, 0, 0, 1, 3),
wantMin: namespace.ID{0},
wantMax: namespace.ID{3},
},
{
name: "example tree with eight leaves",
tree: exampleNMT(2, true, 1, 2, 3, 4, 5, 6, 7, 8),
wantMin: namespace.ID{1, 1},
wantMax: namespace.ID{8, 8},
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
min, err := tc.tree.MinNamespace()
require.NoError(t, err)
assert.Equal(t, tc.wantMin, min)
max, err := tc.tree.MaxNamespace()
require.NoError(t, err)
assert.Equal(t, tc.wantMax, max)
})
}
}
// exampleNMT creates a new NamespacedMerkleTree with the given namespace ID size and leaf namespace IDs. Each byte in the leavesNIDs parameter corresponds to one leaf's namespace ID. If nidSize is greater than 1, the function repeats each NID in leavesNIDs nidSize times before prepending it to the leaf data.
func exampleNMT(nidSize int, ignoreMaxNamespace bool, leavesNIDs ...byte) *NamespacedMerkleTree {
tree := New(sha256.New(), NamespaceIDSize(nidSize), IgnoreMaxNamespace(ignoreMaxNamespace))
for i, nid := range leavesNIDs {
namespace := bytes.Repeat([]byte{nid}, nidSize)
d := append(namespace, []byte(fmt.Sprintf("leaf_%d", i))...)
if err := tree.Push(d); err != nil {
panic(fmt.Sprintf("unexpected error: %v", err))
}
}
return tree
}
// exampleNMT2 Replica of exampleNMT except that it uses the namespace IDs in the
// leaves instead of the index.
func exampleNMT2(nidSize int, ignoreMaxNamespace bool, leavesNIDs ...byte) *NamespacedMerkleTree {
tree := New(sha256.New(), NamespaceIDSize(nidSize), IgnoreMaxNamespace(ignoreMaxNamespace))
for _, nid := range leavesNIDs {
namespace := bytes.Repeat([]byte{nid}, nidSize)
d := append(namespace, []byte(fmt.Sprintf("leaf_%d", nid))...)
if err := tree.Push(d); err != nil {
panic(fmt.Sprintf("unexpected error: %v", err))
}
}
return tree
}
func swap(slice [][]byte, i int, j int) {
temp := slice[i]
slice[i] = slice[j]
slice[j] = temp
}
// Test_buildRangeProof_Err tests that buildRangeProof returns an error when the underlying tree has an invalid state e.g., leaves are not ordered by namespace ID or a leaf hash is corrupted.
func Test_buildRangeProof_Err(t *testing.T) {
nIDList := []byte{1, 2, 3, 4, 5, 6, 7, 8}
nIDSize := 2
// create a nmt, 8 leaves namespaced sequentially from 1-8
treeWithCorruptLeafHash := exampleNMT(nIDSize, true, nIDList...)
// corrupt a leaf hash
treeWithCorruptLeafHash.leafHashes[4] = treeWithCorruptLeafHash.leafHashes[4][:treeWithCorruptLeafHash.NamespaceSize()]
// create an NMT with 8 sequentially namespaced leaves, numbered from 1 to 8.
treeWithUnorderedLeafHashes := exampleNMT(nIDSize, true, nIDList...)
// swap the positions of the 4th and 5th leaves
swap(treeWithUnorderedLeafHashes.leaves, 4, 5)
swap(treeWithUnorderedLeafHashes.leafHashes, 4, 5)
validTree := exampleNMT(nIDSize, true, nIDList...)
tests := []struct {
name string
tree *NamespacedMerkleTree
proofStart, proofEnd int
wantErr bool
errType error
}{
{"corrupt leaf hash", treeWithCorruptLeafHash, 4, 5, true, ErrInvalidNodeLen},
{"unordered leaf hashes: the out of order range", treeWithUnorderedLeafHashes, 4, 5, true, ErrUnorderedSiblings},
{"unordered leaf hashes: the first leaf", treeWithUnorderedLeafHashes, 1, 2, true, ErrUnorderedSiblings}, // for a tree with an unordered set of leaves, the buildRangeProof function should produce an error for any input range,
// not just the corrupted range.
{"unordered leaf hashes: the last leaf", treeWithUnorderedLeafHashes, 7, 8, true, ErrUnorderedSiblings}, // for a tree with an unordered set of leaves, the buildRangeProof function should produce an error for any input range,
// not just the corrupted range.
{"invalid proof range: start > end", validTree, 5, 4, true, ErrInvalidRange},
{"invalid proof range: start = end", validTree, 5, 5, true, ErrInvalidRange},
{"invalid proof range: start < 0", validTree, -1, 4, true, ErrInvalidRange},
{"invalid proof range: end > number of leaves", validTree, 0, len(validTree.leaves) + 1, true, ErrInvalidRange},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, err := tt.tree.buildRangeProof(tt.proofStart, tt.proofEnd)
assert.Equal(t, tt.wantErr, err != nil)
if tt.wantErr {
assert.True(t, errors.Is(err, tt.errType))
}
})
}
}
// Test_ProveRange_Err tests that ProveRange returns an error when the underlying tree has an invalid state e.g., leaves are not ordered by namespace ID or a leaf hash is corrupted.
func Test_ProveRange_Err(t *testing.T) {
// create an NMT with 8 sequentially namespaced leaves, numbered from 1 to 8.
treeWithCorruptLeafHash := exampleNMT(2, true, 1, 2, 3, 4, 5, 6, 7, 8)
// corrupt a leaf hash
treeWithCorruptLeafHash.leafHashes[4] = treeWithCorruptLeafHash.leafHashes[4][:treeWithCorruptLeafHash.NamespaceSize()]
// create an NMT with 8 sequentially namespaced leaves, numbered from 1 to 8.
treeWithUnorderedLeafHashes := exampleNMT(2, true, 1, 2, 3, 4, 5, 6, 7, 8)
// swap the positions of the 4th and 5th leaves
swap(treeWithUnorderedLeafHashes.leaves, 4, 5)
swap(treeWithUnorderedLeafHashes.leafHashes, 4, 5)
tests := []struct {
name string
tree *NamespacedMerkleTree
proofStart, proofEnd int
wantErr bool
errType error
}{
{"corrupt leaf hash", treeWithCorruptLeafHash, 4, 5, true, ErrInvalidNodeLen},
{"unordered leaf hashes: the out of order leaf", treeWithUnorderedLeafHashes, 4, 5, true, ErrUnorderedSiblings},
{"unordered leaf hashes: first leaf", treeWithUnorderedLeafHashes, 1, 2, true, ErrUnorderedSiblings}, // for a tree with an unordered set of leaves, the ProveRange method should produce an error for any input range,
// not just the corrupted range.
{"unordered leaf hashes: last leaf", treeWithUnorderedLeafHashes, 7, 8, true, ErrUnorderedSiblings}, // for a tree with an unordered set of leaves, the ProveRange method should produce an error for any input range,
// not just the corrupted range.
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, err := tt.tree.ProveRange(tt.proofStart, tt.proofEnd)
assert.Equal(t, tt.wantErr, err != nil)
if tt.wantErr {
assert.True(t, errors.Is(err, tt.errType))
}
})
}
}
// The Test_ProveNamespace_Err function tests that ProveNamespace returns an error when the underlying tree is in an invalid state, such as when the leaves are not ordered by namespace ID or when a leaf hash is corrupt.
func Test_ProveNamespace_Err(t *testing.T) {
// create an NMT with 8 sequentially namespaced leaves, numbered from 1 to 8.
treeWithCorruptLeafHash := exampleNMT(2, true, 1, 2, 3, 4, 5, 6, 7, 8)
// corrupt a leaf hash
treeWithCorruptLeafHash.leafHashes[4] = treeWithCorruptLeafHash.leafHashes[4][:treeWithCorruptLeafHash.NamespaceSize()]
// create an NMT with 8 sequentially namespaced leaves, numbered from 1 to 8.
treeWithUnorderedLeafHashes := exampleNMT(2, true, 1, 2, 3, 4, 5, 6, 7, 8)
// swap the positions of the 4th and 5th leaves
swap(treeWithUnorderedLeafHashes.leaves, 4, 5)
swap(treeWithUnorderedLeafHashes.leafHashes, 4, 5)
tests := []struct {
name string
tree *NamespacedMerkleTree
nID namespace.ID
wantErr bool
errType error
}{
{"corrupt leaf hash", treeWithCorruptLeafHash, namespace.ID{5, 5}, true, ErrInvalidNodeLen},
{"unordered leaf hashes: the queried namespace falls in the corrupted range", treeWithUnorderedLeafHashes, namespace.ID{5, 5}, true, ErrUnorderedSiblings},
{"unordered leaf hashes: query for the first namespace", treeWithUnorderedLeafHashes, namespace.ID{1, 1}, true, ErrUnorderedSiblings}, // for a tree with an unordered set of leaves,
// the ProveNamespace method should produce an error for any input namespace ID.
{"unordered leaf hashes: query for the last namespace", treeWithUnorderedLeafHashes, namespace.ID{8, 8}, true, ErrUnorderedSiblings}, // for a tree with an unordered set of leaves,
// the ProveNamespace method should produce an error for any namespace ID.
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, err := tt.tree.ProveNamespace(tt.nID)