You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
149 lines
3.8 KiB
149 lines
3.8 KiB
package merkle
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/sha256"
|
|
"github.com/tendermint/tendermint/binary"
|
|
. "github.com/tendermint/tendermint/common"
|
|
)
|
|
|
|
type IAVLProof struct {
|
|
LeafNode IAVLProofLeafNode
|
|
InnerNodes []IAVLProofInnerNode
|
|
RootHash []byte
|
|
}
|
|
|
|
func (proof *IAVLProof) Verify(keyBytes, valueBytes, rootHash []byte) bool {
|
|
if !bytes.Equal(keyBytes, proof.LeafNode.KeyBytes) {
|
|
return false
|
|
}
|
|
if !bytes.Equal(valueBytes, proof.LeafNode.ValueBytes) {
|
|
return false
|
|
}
|
|
if !bytes.Equal(rootHash, proof.RootHash) {
|
|
return false
|
|
}
|
|
hash := proof.LeafNode.Hash()
|
|
// fmt.Printf("leaf hash: %X\n", hash)
|
|
for _, branch := range proof.InnerNodes {
|
|
hash = branch.Hash(hash)
|
|
// fmt.Printf("branch hash: %X\n", hash)
|
|
}
|
|
// fmt.Printf("root: %X, computed: %X\n", proof.RootHash, hash)
|
|
return bytes.Equal(proof.RootHash, hash)
|
|
}
|
|
|
|
type IAVLProofInnerNode struct {
|
|
Height int8
|
|
Size int
|
|
Left []byte
|
|
Right []byte
|
|
}
|
|
|
|
func (branch IAVLProofInnerNode) Hash(childHash []byte) []byte {
|
|
hasher := sha256.New()
|
|
buf := new(bytes.Buffer)
|
|
n, err := int64(0), error(nil)
|
|
binary.WriteInt8(branch.Height, buf, &n, &err)
|
|
binary.WriteVarint(branch.Size, buf, &n, &err)
|
|
if len(branch.Left) == 0 {
|
|
binary.WriteByteSlice(childHash, buf, &n, &err)
|
|
binary.WriteByteSlice(branch.Right, buf, &n, &err)
|
|
} else {
|
|
binary.WriteByteSlice(branch.Left, buf, &n, &err)
|
|
binary.WriteByteSlice(childHash, buf, &n, &err)
|
|
}
|
|
if err != nil {
|
|
panic(Fmt("Failed to hash IAVLProofInnerNode: %v", err))
|
|
}
|
|
// fmt.Printf("InnerNode hash bytes: %X\n", buf.Bytes())
|
|
hasher.Write(buf.Bytes())
|
|
return hasher.Sum(nil)
|
|
}
|
|
|
|
type IAVLProofLeafNode struct {
|
|
KeyBytes []byte
|
|
ValueBytes []byte
|
|
}
|
|
|
|
func (leaf IAVLProofLeafNode) Hash() []byte {
|
|
hasher := sha256.New()
|
|
buf := new(bytes.Buffer)
|
|
n, err := int64(0), error(nil)
|
|
binary.WriteInt8(0, buf, &n, &err)
|
|
binary.WriteVarint(1, buf, &n, &err)
|
|
binary.WriteByteSlice(leaf.KeyBytes, buf, &n, &err)
|
|
binary.WriteByteSlice(leaf.ValueBytes, buf, &n, &err)
|
|
if err != nil {
|
|
panic(Fmt("Failed to hash IAVLProofLeafNode: %v", err))
|
|
}
|
|
// fmt.Printf("LeafNode hash bytes: %X\n", buf.Bytes())
|
|
hasher.Write(buf.Bytes())
|
|
return hasher.Sum(nil)
|
|
}
|
|
|
|
func (node *IAVLNode) constructProof(t *IAVLTree, key interface{}, proof *IAVLProof) (exists bool) {
|
|
if node.height == 0 {
|
|
if t.keyCodec.Compare(node.key, key) == 0 {
|
|
keyBuf, valueBuf := new(bytes.Buffer), new(bytes.Buffer)
|
|
n, err := int64(0), error(nil)
|
|
t.keyCodec.Encode(node.key, keyBuf, &n, &err)
|
|
if err != nil {
|
|
panic(Fmt("Failed to encode node.key: %v", err))
|
|
}
|
|
t.valueCodec.Encode(node.value, valueBuf, &n, &err)
|
|
if err != nil {
|
|
panic(Fmt("Failed to encode node.value: %v", err))
|
|
}
|
|
leaf := IAVLProofLeafNode{
|
|
KeyBytes: keyBuf.Bytes(),
|
|
ValueBytes: valueBuf.Bytes(),
|
|
}
|
|
proof.LeafNode = leaf
|
|
return true
|
|
} else {
|
|
return false
|
|
}
|
|
} else {
|
|
if t.keyCodec.Compare(key, node.key) < 0 {
|
|
exists := node.getLeftNode(t).constructProof(t, key, proof)
|
|
if !exists {
|
|
return false
|
|
}
|
|
branch := IAVLProofInnerNode{
|
|
Height: node.height,
|
|
Size: node.size,
|
|
Left: nil,
|
|
Right: node.getRightNode(t).hash,
|
|
}
|
|
proof.InnerNodes = append(proof.InnerNodes, branch)
|
|
return true
|
|
} else {
|
|
exists := node.getRightNode(t).constructProof(t, key, proof)
|
|
if !exists {
|
|
return false
|
|
}
|
|
branch := IAVLProofInnerNode{
|
|
Height: node.height,
|
|
Size: node.size,
|
|
Left: node.getLeftNode(t).hash,
|
|
Right: nil,
|
|
}
|
|
proof.InnerNodes = append(proof.InnerNodes, branch)
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
|
|
// Returns nil if key is not in tree.
|
|
func (t *IAVLTree) ConstructProof(key interface{}) *IAVLProof {
|
|
if t.root == nil {
|
|
return nil
|
|
}
|
|
t.root.hashWithCount(t) // Ensure that all hashes are calculated.
|
|
proof := &IAVLProof{
|
|
RootHash: t.root.hash,
|
|
}
|
|
t.root.constructProof(t, key, proof)
|
|
return proof
|
|
}
|