1const chai = require("chai");
 2const path = require("path");
 3const wasm_tester = require("circom_tester").wasm;
 4const buildBabyjub = require("circomlibjs").buildBabyjub;
 5const Scalar = require("ffjavascript").Scalar;
 6
 7const assert = chai.assert;
 8
 9function print(circuit, w, s) {
10    console.log(s + ": " + w[circuit.getSignalIdx(s)]);
11}
12
13describe("Escalarmul test", function () {
14    let babyJub;
15    let Fr;
16    let circuit;
17
18    this.timeout(100000);
19
20
21    before( async() => {
22        babyJub = await buildBabyjub();
23        Fr = babyJub.F;
24        circuit = await wasm_tester(path.join(__dirname, "circuits", "escalarmulfix_test.circom"));
25    });
26
27    it("Should generate Same escalar mul", async () => {
28
29        const w = await circuit.calculateWitness({"e": 0});
30
31        await circuit.checkConstraints(w);
32
33        await circuit.assertOut(w, {out: [0,1]}, true);
34
35    });
36
37    it("Should generate Same escalar mul", async () => {
38
39        const w = await circuit.calculateWitness({"e": 1}, true);
40
41        await circuit.checkConstraints(w);
42
43        await circuit.assertOut(w, {out: [Fr.toObject(babyJub.Base8[0]), Fr.toObject(babyJub.Base8[1])]});
44
45    });
46
47    it("Should generate scalar mul of a specific constant", async () => {
48
49        const s = Scalar.e("2351960337287830298912035165133676222414898052661454064215017316447594616519");
50        const base8 = [
51            Fr.e("5299619240641551281634865583518297030282874472190772894086521144482721001553"),
52            Fr.e("16950150798460657717958625567821834550301663161624707787222815936182638968203")
53        ];
54
55        const w = await circuit.calculateWitness({"e": s}, true);
56
57        await circuit.checkConstraints(w);
58
59        const expectedRes = babyJub.mulPointEscalar(base8, s);
60
61        await circuit.assertOut(w, {out: [Fr.toObject(expectedRes[0]), Fr.toObject(expectedRes[1])]});
62
63    });
64
65    it("Should generate scalar mul of the firsts 50 elements", async () => {
66
67        const base8 = [
68            Fr.e("5299619240641551281634865583518297030282874472190772894086521144482721001553"),
69            Fr.e("16950150798460657717958625567821834550301663161624707787222815936182638968203")
70        ];
71
72        for (let i=0; i<50; i++) {
73            const s = Scalar.e(i);
74
75            const w = await circuit.calculateWitness({"e": s}, true);
76
77            await circuit.checkConstraints(w);
78
79            const expectedRes = babyJub.mulPointEscalar(base8, s);
80
81            await circuit.assertOut(w, {out: [Fr.toObject(expectedRes[0]), Fr.toObject(expectedRes[1])]});
82        }
83    });
84
85    it("If multiply by order should return 0", async () => {
86
87        const w = await circuit.calculateWitness({"e": babyJub.subOrder }, true);
88
89        await circuit.checkConstraints(w);
90
91        await circuit.assertOut(w, {out: [0,1]});
92    });
93
94});
95