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const chai = require("chai");
const path = require("path");
const snarkjs = require("snarkjs");
const crypto = require("crypto");
const assert = chai.assert;
const sha256 = require("./helpers/sha256");
const tester = require("circom").tester;
// const printSignal = require("./helpers/printsignal");
function buffer2bitArray(b) {
const res = [];
for (let i=0; i<b.length; i++) {
for (let j=0; j<8; j++) {
res.push((b[i] >> (7-j) &1));
}
}
return res;
}
function bitArray2buffer(a) {
const len = Math.floor((a.length -1 )/8)+1;
const b = new Buffer.alloc(len);
for (let i=0; i<a.length; i++) {
const p = Math.floor(i/8);
b[p] = b[p] | (Number(a[i]) << ( 7 - (i%8) ));
}
return b;
}
describe("SHA256 test", function () {
this.timeout(100000);
it("Should work bits to array and array to bits", async () => {
const b = new Buffer.alloc(64);
for (let i=0; i<64; i++) {
b[i] = i+1;
}
const a = buffer2bitArray(b);
const b2 = bitArray2buffer(a);
assert.equal(b.toString("hex"), b2.toString("hex"));
});
it("Should calculate a hash of 1 compressor", async () => {
const cir = await tester(path.join(__dirname, "circuits", "sha256_2_test.circom"));
const witness = await cir.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);
it("Should calculate a hash of 2 compressor", async () => {
const cir = await tester(path.join(__dirname, "circuits", "sha256_test512.circom"));
const b = new Buffer.alloc(64);
for (let i=0; i<64; i++) {
b[i] = i+1;
}
const hash = crypto.createHash("sha256")
.update(b)
.digest("hex");
const arrIn = buffer2bitArray(b);
const witness = await cir.calculateWitness({ "in": arrIn });
const arrOut = witness.slice(1, 257);
const hash2 = bitArray2buffer(arrOut).toString("hex");
assert.equal(hash, hash2);
}).timeout(1000000);
it ("Should calculate a hash of 2 compressor", async () => {
const cir = await tester(path.join(__dirname, "circuits", "sha256_test448.circom"));
const testStr = "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
const b = Buffer.from(testStr, "utf8");
const hash = crypto.createHash("sha256")
.update(b)
.digest("hex");
const arrIn = buffer2bitArray(b);
const witness = await cir.calculateWitness({ "in": arrIn });
const arrOut = witness.slice(1, 257);
const hash2 = bitArray2buffer(arrOut).toString("hex");
assert.equal(hash, hash2);
});
});