1const chai = require("chai");
  2const path = require("path");
  3const snarkjs = require("snarkjs");
  4const crypto = require("crypto");
  5
  6const assert = chai.assert;
  7
  8const sha256 = require("./helpers/sha256");
  9
 10const tester = require("circom").tester;
 11
 12// const printSignal = require("./helpers/printsignal");
 13
 14
 15function buffer2bitArray(b) {
 16    const res = [];
 17    for (let i=0; i<b.length; i++) {
 18        for (let j=0; j<8; j++) {
 19            res.push((b[i] >> (7-j) &1));
 20        }
 21    }
 22    return res;
 23}
 24
 25function bitArray2buffer(a) {
 26    const len = Math.floor((a.length -1 )/8)+1;
 27    const b = new Buffer.alloc(len);
 28
 29    for (let i=0; i<a.length; i++) {
 30        const p = Math.floor(i/8);
 31        b[p] = b[p] | (Number(a[i]) << ( 7 - (i%8)  ));
 32    }
 33    return b;
 34}
 35
 36
 37describe("SHA256 test", function () {
 38    this.timeout(100000);
 39
 40
 41    it("Should work bits to array and array to bits", async () => {
 42        const b = new Buffer.alloc(64);
 43        for (let i=0; i<64; i++) {
 44            b[i] = i+1;
 45        }
 46        const a = buffer2bitArray(b);
 47        const b2 = bitArray2buffer(a);
 48
 49        assert.equal(b.toString("hex"), b2.toString("hex"));
 50    });
 51
 52    it("Should calculate a hash of 1 compressor", async () => {
 53        const cir = await tester(path.join(__dirname, "circuits", "sha256_2_test.circom"));
 54
 55        const witness = await cir.calculateWitness({ "a": "1", "b": "2" });
 56
 57        const b = new Buffer.alloc(54);
 58        b[26] = 1;
 59        b[53] = 2;
 60
 61        const hash = crypto.createHash("sha256")
 62            .update(b)
 63            .digest("hex");
 64        const r = "0x" + hash.slice(10);
 65
 66        const hash2 = sha256.hash(b.toString("hex"), {msgFormat: "hex-bytes"});
 67
 68        assert.equal(hash, hash2);
 69
 70        assert(witness[1].equals(snarkjs.bigInt(r)));
 71    }).timeout(1000000);
 72
 73    it("Should calculate a hash of 2 compressor", async () => {
 74        const cir = await tester(path.join(__dirname, "circuits", "sha256_test512.circom"));
 75
 76        const b = new Buffer.alloc(64);
 77        for (let i=0; i<64; i++) {
 78            b[i] = i+1;
 79        }
 80
 81        const hash = crypto.createHash("sha256")
 82            .update(b)
 83            .digest("hex");
 84
 85        const arrIn = buffer2bitArray(b);
 86        const witness = await cir.calculateWitness({ "in": arrIn });
 87
 88        const arrOut = witness.slice(1, 257);
 89        const hash2 = bitArray2buffer(arrOut).toString("hex");
 90
 91        assert.equal(hash, hash2);
 92
 93    }).timeout(1000000);
 94    it ("Should calculate a hash of 2 compressor", async () => {
 95        const cir = await tester(path.join(__dirname, "circuits", "sha256_test448.circom"));
 96
 97        const testStr = "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
 98
 99        const b = Buffer.from(testStr, "utf8");
100
101        const hash = crypto.createHash("sha256")
102            .update(b)
103            .digest("hex");
104
105        const arrIn = buffer2bitArray(b);
106
107        const witness = await cir.calculateWitness({ "in": arrIn });
108
109        const arrOut = witness.slice(1, 257);
110        const hash2 = bitArray2buffer(arrOut).toString("hex");
111
112        assert.equal(hash, hash2);
113    });
114
115});