package merkle import ( "bytes" . "github.com/tendermint/tmlibs/common" . "github.com/tendermint/tmlibs/test" "testing" ) type testItem []byte func (tI testItem) Hash() []byte { return []byte(tI) } func TestSimpleProof(t *testing.T) { total := 100 items := make([]Hasher, total) for i := 0; i < total; i++ { items[i] = testItem(RandBytes(32)) } rootHash := SimpleHashFromHashers(items) rootHash2, proofs := SimpleProofsFromHashers(items) if !bytes.Equal(rootHash, rootHash2) { t.Errorf("Unmatched root hashes: %X vs %X", rootHash, rootHash2) } // For each item, check the trail. for i, item := range items { itemHash := item.Hash() proof := proofs[i] // Verify success ok := proof.Verify(i, total, itemHash, rootHash) if !ok { t.Errorf("Verification failed for index %v.", i) } // Wrong item index should make it fail { ok = proof.Verify((i+1)%total, total, itemHash, rootHash) if ok { t.Errorf("Expected verification to fail for wrong index %v.", i) } } // Trail too long should make it fail origAunts := proof.Aunts proof.Aunts = append(proof.Aunts, RandBytes(32)) { ok = proof.Verify(i, total, itemHash, rootHash) if ok { t.Errorf("Expected verification to fail for wrong trail length.") } } proof.Aunts = origAunts // Trail too short should make it fail proof.Aunts = proof.Aunts[0 : len(proof.Aunts)-1] { ok = proof.Verify(i, total, itemHash, rootHash) if ok { t.Errorf("Expected verification to fail for wrong trail length.") } } proof.Aunts = origAunts // Mutating the itemHash should make it fail. ok = proof.Verify(i, total, MutateByteSlice(itemHash), rootHash) if ok { t.Errorf("Expected verification to fail for mutated leaf hash") } // Mutating the rootHash should make it fail. ok = proof.Verify(i, total, itemHash, MutateByteSlice(rootHash)) if ok { t.Errorf("Expected verification to fail for mutated root hash") } } }