wampy-cra/dist/wampy-cra.js

Wampy.js challenge response authentication (CRA) plugin

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.deriveKey = deriveKey;
exports.setCrypto = setCrypto;
exports.sign = sign;
exports.signManual = signManual;

function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }

/**
 * Project: wampy-cra.js
 *
 * https://github.com/KSDaemon/wampy-cra
 *
 * Wampy.js Challenge Response Authentication plugin
 *
 * Copyright 2016 KSDaemon. Licensed under the MIT License.
 * See @license text at http://www.opensource.org/licenses/mit-license.php
 *
 */
var isNode = (typeof process === "undefined" ? "undefined" : _typeof(process)) === 'object' && Object.prototype.toString.call(process) === '[object process]';
var crypto;

function setCrypto(lib) {
  crypto = lib;
}

function deriveKey(secret, salt) {
  var iterations = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1000;
  var keylen = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 32;
  var key;

  if (isNode) {
    key = crypto.pbkdf2Sync(secret, salt, iterations, keylen, 'sha256');
    return key.toString('base64');
  } else {
    var config = {
      keySize: keylen / 4,
      iterations: iterations,
      hasher: crypto.algo.SHA256
    };
    key = crypto.PBKDF2(secret, salt, config);
    return key.toString(crypto.enc.Base64);
  }
}

function signManual(key, challenge) {
  if (isNode) {
    var hmac = crypto.createHmac('sha256', key);
    hmac.update(challenge);
    return hmac.digest('base64');
  } else {
    return crypto.HmacSHA256(challenge, key).toString(crypto.enc.Base64);
  }
}

function sign(secret) {
  return function (method, info) {
    if (method === 'wampcra') {
      if (info.salt) {
        return signManual(deriveKey(secret, info.salt, info.iterations, info.keylen), info.challenge);
      } else {
        return signManual(secret, info.challenge);
      }
    } else {
      throw new Error('Unknown authentication method requested!');
    }
  };
}
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