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74 lines
1.8 KiB
74 lines
1.8 KiB
package merkle
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import (
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. "github.com/tendermint/tendermint/common"
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"bytes"
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"testing"
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)
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type testItem []byte
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func (tI testItem) Hash() []byte {
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return []byte(tI)
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}
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func TestMerkleTrails(t *testing.T) {
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numItems := uint(100)
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items := make([]Hashable, numItems)
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for i := uint(0); i < numItems; i++ {
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items[i] = testItem(RandBytes(32))
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}
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root := HashFromHashables(items)
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trails, rootTrail := HashTrailsFromHashables(items)
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// Assert that HashFromHashables and HashTrailsFromHashables are compatible.
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if !bytes.Equal(root, rootTrail.Hash) {
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t.Errorf("Root mismatch:\n%X vs\n%X", root, rootTrail.Hash)
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}
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// For each item, check the trail.
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for i, item := range items {
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itemHash := item.Hash()
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flatTrail := trails[i].Flatten()
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// Verify success
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ok := VerifyHashTrail(uint(i), numItems, itemHash, flatTrail, root)
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if !ok {
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t.Errorf("Verification failed for index %v.", i)
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}
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// Wrong item index should make it fail
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ok = VerifyHashTrail(uint(i)+1, numItems, itemHash, flatTrail, root)
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if ok {
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t.Errorf("Expected verification to fail for wrong index %v.", i)
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}
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// Trail too long should make it fail
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trail2 := append(flatTrail, RandBytes(32))
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ok = VerifyHashTrail(uint(i), numItems, itemHash, trail2, root)
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if ok {
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t.Errorf("Expected verification to fail for wrong trail length.")
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}
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// Trail too short should make it fail
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trail2 = flatTrail[:len(flatTrail)-1]
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ok = VerifyHashTrail(uint(i), numItems, itemHash, trail2, root)
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if ok {
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t.Errorf("Expected verification to fail for wrong trail length.")
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}
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// Mutating the itemHash should make it fail.
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itemHash2 := make([]byte, len(itemHash))
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copy(itemHash2, itemHash)
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itemHash2[0] += byte(0x01)
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ok = VerifyHashTrail(uint(i), numItems, itemHash2, flatTrail, root)
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if ok {
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t.Errorf("Expected verification to fail for mutated leaf hash")
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}
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}
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}
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