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package merkle
import (
"bytes"
cmn "github.com/tendermint/tmlibs/common"
. "github.com/tendermint/tmlibs/test"
"github.com/tendermint/tendermint/crypto/tmhash"
"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(cmn.RandBytes(tmhash.Size))
}
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, cmn.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")
}
}
}