aes-cmac/test/BufferTools.test.ts

AES-CMAC implementation in typescript

import assert from "node:assert";
import { describe, it } from "node:test";
import { BufferTools } from "../src/BufferTools";

describe("buffer-tools", () => {
  describe("bitShiftLeft", () => {
    function testBitShiftLeft(input: string): string {
      return Buffer.from(BufferTools.bitShiftLeft(Buffer.from(input, "hex"))).toString("hex");
    }

    it("returns a buffer bitshifted left 1 bit (buffer_value << 1)", () => {
      assert.strictEqual(testBitShiftLeft("01"), "02");
      assert.strictEqual(testBitShiftLeft("02"), "04");
      assert.strictEqual(testBitShiftLeft("04"), "08");
      assert.strictEqual(testBitShiftLeft("08"), "10");
      assert.strictEqual(testBitShiftLeft("10"), "20");
      assert.strictEqual(testBitShiftLeft("20"), "40");
      assert.strictEqual(testBitShiftLeft("40"), "80");
      assert.strictEqual(testBitShiftLeft("80"), "00");
      assert.strictEqual(testBitShiftLeft("55cc33"), "ab9866");
    });
  });

  describe("xor", () => {
    function testXor(a: string, b: string): string {
      return Buffer.from(BufferTools.xor(Buffer.from(a, "hex"), Buffer.from(b, "hex"))).toString(
        "hex",
      );
    }

    it("returns the logical XOR of two buffers", () => {
      assert.strictEqual(testXor("5a", "a5"), "ff");
      assert.strictEqual(testXor("5a", "5a"), "00");
      assert.strictEqual(testXor("5a", "ff"), "a5");
      assert.strictEqual(testXor("5a", "00"), "5a");
      assert.strictEqual(testXor("5a", "c3"), "99");
      assert.strictEqual(testXor("5a", "99"), "c3");
      assert.strictEqual(testXor("abcd", "0123"), "aaee");
      assert.strictEqual(testXor("123456", "789abc"), "6aaeea");
    });
  });

  describe("toBinaryString", () => {
    function testToBinaryString(input: string): string {
      return BufferTools.toBinaryString(Buffer.from(input, "hex"));
    }

    it("returns the binary string representation of a buffer", () => {
      assert.strictEqual(testToBinaryString("0f"), "00001111");
      assert.strictEqual(testToBinaryString("5ac3"), "0101101011000011");
      assert.strictEqual(testToBinaryString("deadbeef"), "11011110101011011011111011101111");
    });
  });
});