1const path = require("path");
 2
 3const bigInt = require("big-integer");
 4const tester = require("circom").tester;
 5
 6const babyJub = require("../src/babyjub.js");
 7const pedersen = require("../src/pedersenHash.js");
 8
 9
10describe("Pedersen test", function() {
11    let circuit;
12    this.timeout(100000);
13    before( async() => {
14
15        circuit = await tester(path.join(__dirname, "circuits", "pedersen2_test.circom"));
16    });
17    it("Should pedersen at zero", async () => {
18
19        let w;
20
21        w = await circuit.calculateWitness({ in: 0});
22
23        const b = Buffer.alloc(32);
24
25        const h = pedersen.hash(b);
26        const hP = babyJub.unpackPoint(h);
27
28        await circuit.assertOut(w, {out: hP});
29
30    });
31    it("Should pedersen with 253 ones", async () => {
32
33        let w;
34
35        const n = bigInt.one.shiftLeft(253).minus(bigInt.one);
36
37        w = await circuit.calculateWitness({ in: n});
38
39        const b = Buffer.alloc(32);
40        for (let i=0; i<31; i++) b[i] = 0xFF;
41        b[31] = 0x1F;
42
43        const h = pedersen.hash(b);
44        const hP = babyJub.unpackPoint(h);
45
46        await circuit.assertOut(w, {out: hP});
47
48    });
49});