stegcloak.js

"use strict";

const R = require("ramda");

const {
  encrypt,
  decrypt
} = require("./components/encrypt");

const {
  compress,
  decompress,
  zwcHuffMan
} = require("./components/compact");

const {
  zwcOperations,
  embed
} = require("./components/message");

const zwc = ["‌", "‍", "⁡", "⁢", "⁣", "⁤"]; // 200c,200d,2061,2062,2063,2064 Where the magic happens !

const {
  toConceal,
  toConcealHmac,
  concealToData,
  noCrypt,
  detach,
} = zwcOperations(zwc);

const {
  shrink,
  expand
} = zwcHuffMan(zwc);

const {
  byteToBin,
  compliment
} = require("./components/util");

class StegCloak {
  constructor(_encrypt = true, _integrity = false) {
    this.encrypt = _encrypt;

    this.integrity = _integrity;
  }

  static get zwc() {
    return zwc;
  }

  hide(message, password, cover = "This is a confidential text") {
    if (cover.split(" ").length === 1) {
      throw new Error("Minimum two words required");
    }

    const integrity = this.integrity;

    const crypt = this.encrypt;

    const secret = R.pipe(compress, compliment)(message); // Compress and compliment to prepare the secret

    const payload = crypt ?
      encrypt({
        password: password,
        data: secret,
        integrity,
      }) :
      secret; // Encrypt if needed or proxy secret

    const invisibleStream = R.pipe(
      byteToBin,
      integrity && crypt ? toConcealHmac : crypt ? toConceal : noCrypt,
      shrink
    )(payload); // Create an optimal invisible stream of secret

    return embed(cover, invisibleStream); // Embed stream  with cover text
  }

  reveal(secret, password) {
    // Detach invisible characters and convert back to visible characters and also returns analysis of if encryption or integrity check was done

    const {
      data,
      integrity,
      encrypt
    } = R.pipe(
      detach,
      expand,
      concealToData
    )(secret);

    const decryptStream = encrypt ?
      decrypt({
        password,
        data,
        integrity,
      }) :
      data; // Decrypt if needed or proxy secret

    return R.pipe(compliment, decompress)(decryptStream); // Receive the secret
  }
}

module.exports = StegCloak;