card-sharing/build/utils/cryptographic-block.js

card sharing config generator by parsing online sources

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var CryptographicBlock = function () {
  function CryptographicBlock() {
    _classCallCheck(this, CryptographicBlock);
  }

  _createClass(CryptographicBlock, [{
    key: "init",
    value: function init(key) {
      var len = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : key.length;

      this.keytable = [];

      for (var i = 0; i < 256; i++) {
        this.keytable.push(i);
      }

      var j = 0;
      var aux = null;
      for (var _i = 0; _i < 256; _i++) {
        j = 0xff & j + key[_i % len] + this.keytable[_i];
        aux = this.keytable[_i];
        this.keytable[_i] = this.keytable[j];
        this.keytable[j] = aux;
      }

      this.state = key[0];
      this.counter = 0;
      this.sum = 0;
    }
  }, {
    key: "decrypt",
    value: function decrypt(data) {
      var len = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : data.length;

      for (var i = 0; i < len; i++) {
        this.counter = 0xff & this.counter + 1;
        this.sum = this.sum + this.keytable[this.counter];
        var aux = this.keytable[this.sum & 0xFF];
        this.keytable[this.sum & 0xFF] = this.keytable[this.counter];
        this.keytable[this.counter] = aux;
        var z = data[i];
        data[i] = z ^ this.keytable[this.keytable[this.counter] + this.keytable[this.sum & 0xFF] & 0xFF] ^ this.state;
        z = data[i];
        this.state = 0xff & (this.state ^ z);
      }
    }
  }, {
    key: "encrypt",
    value: function encrypt(data) {
      var len = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : data.length;

      if (!len) len = data.length;
      for (var i = 0; i < len; i++) {
        this.counter = 0xff & this.counter + 1;
        this.sum = this.sum + this.keytable[this.counter];
        var aux = this.keytable[this.counter];
        this.keytable[this.counter] = this.keytable[this.sum & 0xFF];
        this.keytable[this.sum & 0xFF] = aux;
        var z = data[i];
        data[i] = z ^ this.keytable[this.keytable[this.counter & 0xFF] + this.keytable[this.sum & 0xFF] & 0xff] ^ this.state;
        this.state = 0xff & (this.state ^ z);
      }
    }
  }]);

  return CryptographicBlock;
}();

exports.default = CryptographicBlock;