circomlib/test/sha256.js

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2018-12-06 19:32:49 +03:00
const chai = require("chai");
const path = require("path");
const snarkjs = require("snarkjs");
const crypto = require("crypto");
const compiler = require("circom");
const assert = chai.assert;
const sha256 = require("./helpers/sha256");
// const printSignal = require("./helpers/printsignal");
describe("SHA256 test", () => {
it("Should calculate a hash", async () => {
const cirDef = await compiler(path.join(__dirname, "circuits", "sha256_2_test.circom"));
const circuit = new snarkjs.Circuit(cirDef);
console.log("Vars: "+circuit.nVars);
console.log("Constraints: "+circuit.nConstraints);
const witness = circuit.calculateWitness({ "a": "1", "b": "2" });
const b = new Buffer.alloc(54);
b[26] = 1;
b[53] = 2;
const hash = crypto.createHash("sha256")
.update(b)
.digest("hex");
const r = "0x" + hash.slice(10);
const hash2 = sha256.hash(b.toString("hex"), {msgFormat: "hex-bytes"});
assert.equal(hash, hash2);
assert(witness[1].equals(snarkjs.bigInt(r)));
}).timeout(1000000);
});