Sociopunk: text-based steganography

sociopunk.js

// Sociopunk plaintext steganography module aimed at social network posting

// Encoding: Sociopunk.enc(secretText, coverText) when cover text is in Latin
// or Sociopunk.enc(secretText, coverText, true) when cover text is in Cyrillic
// Decoding: Sociopunk.dec(coverText) or Socipunk.dec(coverText, true) respectively

Sociopunk = (function(){
  var msg2bin = m => unescape(encodeURIComponent(m)).split('').map(c=>('00000000'+c.charCodeAt(0).toString(2)).substr(-8)).join('').split('').map(Number),
  bin2msg = b => decodeURIComponent(escape(b.join('').match(/\d{8}/g).map(c => String.fromCharCode(Number('0b'+c))).join(''))),
  latinPattern = 'aeiocxAEIOCX', cyrPattern = 'аеіосхАЕІОСХ';
  return {
    enc: function(sText, cText, isCyr) {
      var pi, sBinRep = msg2bin(sText), sLen = sBinRep.length, cLen = cText.length, si=0, ci, outText='',
          homePattern = isCyr ? cyrPattern : latinPattern,
          guestPattern = isCyr ? latinPattern : cyrPattern
      for(ci=0;ci<cLen;ci++) {
        pi = homePattern.indexOf(cText[ci])
        if(pi > -1) {
          outText += sBinRep[si] === 1 ? guestPattern[pi] : homePattern[pi]
          si++
        }
        else outText += cText[ci]
      }
      return outText
    },
    dec: function(cText, isCyr) {
      var guestPattern = isCyr ? latinPattern : cyrPattern,
          seq = cText.match(RegExp('['+cyrPattern+latinPattern+']','g')),
          outSeq = [], seqLen = seq.length, i;
      for(i=0;i<seqLen;i++)
        outSeq.push(guestPattern.indexOf(seq[i]) > -1 ? 1 : 0)
      return bin2msg(outSeq)
    }
  }
})();