add first merkletree test with Poseidon hash

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>

package.json

@@ -10,8 +10,10 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "@zk-kit/protocols": "^1.11.1",
+    "circomlib": "^2.0.2",
+    "circomlibjs": "^0.0.8",
     "mocha": "^10.1.0",
-    "snarkjs": "^0.5.0",
-    "circomlib": "^2.0.2"
+    "snarkjs": "^0.5.0"
   }
 }

test/merkletree.js

@@ -0,0 +1,61 @@
+//import { generateMerkleProof, generateMerkleTree } from "@zk-kit/protocols"
+import { IncrementalMerkleTree } from "@zk-kit/incremental-merkle-tree"
+import { poseidon } from "circomlibjs"
+import assert from "assert";
+import path from "path";
+import * as snarkjs from "snarkjs";
+
+describe("MerkleTree", function ()  {
+
+  const depth = 21
+  const numberOfLeaves = 2 ** 2
+  const hashFn = poseidon
+  const zeroValue = BigInt(0)
+  const arity = 2
+  const queryLen = 1
+
+  const r1csPath = path.join("circuits", "storer.r1cs");
+  const wasmPath = path.join("circuits", "storer_js", "storer.wasm");
+
+  var tree
+  it ("generate Merkle Tree from data", async () => {
+    tree = new IncrementalMerkleTree(hashFn, depth, zeroValue, arity)
+    for (let i = 0; i < numberOfLeaves; i += 1) {
+      tree.insert(BigInt(i + 1))
+    }
+  })
+
+  var merkleProof
+  it ("create proof", async () => {
+    merkleProof = tree.createProof(0)
+  })
+
+  it ("verify proof", async () => {
+    assert(tree.verifyProof(merkleProof))
+    console.warn(merkleProof)
+  })
+
+  const wtns = {type: "mem"};
+  it ("witness calculate", async () => {
+
+    // inputs defined in circuit:
+    //   signal input chunks[qLen][blockSize];
+    //   signal input chunkHashes[qLen];
+    //   signal input indices[qLen];
+    //   signal input treeSiblings[qLen][nLevels];
+    //   signal input root;
+
+    console.warn(hashFn([1]))
+    let chunks = [[1,2]]
+    await snarkjs.wtns.calculate(
+      { chunks: chunks,
+        chunkHashes: [hashFn(chunks[0])],
+        indices: [0],
+        treeSiblings: [merkleProof.siblings.slice(1)],
+        root: merkleProof.root
+      }, wasmPath, wtns);
+    console.warn("witness: ", wtns);
+    // console.warn("witness: ", wtns.data.length, " bytes");
+    // console.warn("witness: ", sizeOf(wtns.data), " bytes");
+  })
+})