@perion/crypto/test/aes.test.js

Exports the cryptography functions needed for MapleStory

const assert = require('assert');
const {AES} = require('../index.js');
describe('@perion/crypto.AES', function() {
  it('should scale the IV', function() {
    const scaled = AES.scaleIV(Buffer.from([0x1, 0x2, 0x3, 0x4]), 4, 4);
    assert.ok(scaled.length == 16);
    const expected = Buffer.from([
      0x1, 0x2, 0x3, 0x4,
      0x1, 0x2, 0x3, 0x4,
      0x1, 0x2, 0x3, 0x4,
      0x1, 0x2, 0x3, 0x4,
    ]);
    let same = true;
    expected.forEach((val, idx) => {
      if (expected[idx] !== scaled[idx]) same = false;
    });
    assert.ok(same);
  });
  it('should transform the data', function() {
    let iv = Buffer.from([0x1, 0x2, 0x3, 0x4]);
    const aes = new AES(iv, 83);
    const data1 = Buffer.from([0x1, 0x1, 0x1, 0x1]);
    const transformed = aes.transform(data1);
    const ans1 = Buffer.from([0xf1, 0xef, 0xa5, 0xd3]);
    assert.ok(transformed.compare(ans1) == 0);
  });
  it('should _transform the data', function() {
    let iv = Buffer.from([0x1, 0x2, 0x3, 0x4]);
    const aes = new AES(iv, 83);
    const data1 = Buffer.from([0x1, 0x1, 0x1, 0x1]);
    const transformed = aes._transform(data1);
    const ans1 = Buffer.from([0xf1, 0xef, 0xa5, 0xd3]);
    assert.ok(transformed.compare(ans1) == 0);
  });
  it('should transform the data twice to test morphIV()', function() {
    const iv = Buffer.from([0x1, 0x2, 0x3, 0x4]);
    const aes = new AES(iv, 83);
    const aesCopy = new AES(Buffer.from([0x1, 0x2, 0x3, 0x4]), 83);
    const data1 = Buffer.from([0x1, 0x1, 0x1, 0x1]);
    const transformed = aes.transform(data1);
    const transformed2 = aesCopy.transform(transformed);
    const ans1 = Buffer.from([0x01, 0x01, 0x01, 0x01]);
    assert.ok(transformed2.compare(ans1) == 0);
  });
  it('should get the packet header', function() {
    let iv = Buffer.from([0x1, 0x2, 0x3, 0x4]);
    const aes = new AES(iv, 83);
    const header = aes.getPacketHeader(4);
    assert.ok(header.compare(Buffer.from([0x03, 0xac, 0x07, 0xac])) == 0);
    assert.ok(aes._getPacketLength(header) === 4);
  });
});