34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
include "./MerkleTree.circom";
|
|
|
|
// inserts a leaf into a tree
|
|
// checks that tree previously contained zero in the same position
|
|
template MerkleTreeUpdater(levels, zeroLeaf) {
|
|
signal input oldRoot;
|
|
signal input newRoot;
|
|
signal input leaf;
|
|
signal input pathIndices;
|
|
signal private input pathElements[levels];
|
|
|
|
// Compute indexBits once for both trees
|
|
// Since Num2Bits is non deterministic, 2 duplicate calls to it cannot be
|
|
// optimized by circom compiler
|
|
component indexBits = Num2Bits(levels);
|
|
indexBits.in <== pathIndices;
|
|
|
|
component treeBefore = RawMerkleTree(levels);
|
|
for(var i = 0; i < levels; i++) {
|
|
treeBefore.pathIndices[i] <== indexBits.out[i];
|
|
treeBefore.pathElements[i] <== pathElements[i];
|
|
}
|
|
treeBefore.leaf <== zeroLeaf;
|
|
treeBefore.root === oldRoot;
|
|
|
|
component treeAfter = RawMerkleTree(levels);
|
|
for(var i = 0; i < levels; i++) {
|
|
treeAfter.pathIndices[i] <== indexBits.out[i];
|
|
treeAfter.pathElements[i] <== pathElements[i];
|
|
}
|
|
treeAfter.leaf <== leaf;
|
|
treeAfter.root === newRoot;
|
|
}
|