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//Copyright 2014-2015 Google Inc. All rights reserved.

//Use of this source code is governed by a BSD-style
//license that can be found in the LICENSE file or at
//https://developers.google.com/open-source/licenses/bsd

// ref: https://github.com/google/u2f-ref-code/blob/master/u2f-gae-demo/war/js/u2f-api.js

/**
 * @fileoverview The U2F api.
 */
'use strict';

/**
 * Modification:
 * Wrap implementation so that we can exit if window.u2f is already supplied by the browser (see below).
 */
(function (root) {
    /**
     * Modification:
     * Only continue load this library if window.u2f is not already supplied by the browser.
     */
    var isFirefox = navigator.userAgent.indexOf('Firefox') !== -1 || navigator.userAgent.indexOf('Gecko/') !== -1;
    var browserImplementsU2f = !!((typeof root.u2f !== 'undefined') && root.u2f.register);

    if (isFirefox && browserImplementsU2f) {
        root.u2f.isSupported = true;
        return;
    }

    /**
     * Namespace for the U2F api.
     * @type {Object}
     */
    var u2f = root.u2f || {};

    /**
     * Modification:
     * Check if browser supports U2F API before this wrapper was added.
     */
    u2f.isSupported = !!(((typeof u2f !== 'undefined') && u2f.register) || ((typeof chrome !== 'undefined') && chrome.runtime));

    /**
     * FIDO U2F Javascript API Version
     * @number
     */
    var js_api_version;

    /**
     * The U2F extension id
     * @const {string}
     */
    // The Chrome packaged app extension ID.
    // Uncomment this if you want to deploy a server instance that uses
    // the package Chrome app and does not require installing the U2F Chrome extension.
    u2f.EXTENSION_ID = 'kmendfapggjehodndflmmgagdbamhnfd';
    // The U2F Chrome extension ID.
    // Uncomment this if you want to deploy a server instance that uses
    // the U2F Chrome extension to authenticate.
    // u2f.EXTENSION_ID = 'pfboblefjcgdjicmnffhdgionmgcdmne';


    /**
     * Message types for messsages to/from the extension
     * @const
     * @enum {string}
     */
    u2f.MessageTypes = {
        'U2F_REGISTER_REQUEST': 'u2f_register_request',
        'U2F_REGISTER_RESPONSE': 'u2f_register_response',
        'U2F_SIGN_REQUEST': 'u2f_sign_request',
        'U2F_SIGN_RESPONSE': 'u2f_sign_response',
        'U2F_GET_API_VERSION_REQUEST': 'u2f_get_api_version_request',
        'U2F_GET_API_VERSION_RESPONSE': 'u2f_get_api_version_response'
    };


    /**
     * Response status codes
     * @const
     * @enum {number}
     */
    u2f.ErrorCodes = {
        'OK': 0,
        'OTHER_ERROR': 1,
        'BAD_REQUEST': 2,
        'CONFIGURATION_UNSUPPORTED': 3,
        'DEVICE_INELIGIBLE': 4,
        'TIMEOUT': 5
    };


    /**
     * A message for registration requests
     * @typedef {{
     *   type: u2f.MessageTypes,
     *   appId: ?string,
     *   timeoutSeconds: ?number,
     *   requestId: ?number
     * }}
     */
    u2f.U2fRequest;


    /**
     * A message for registration responses
     * @typedef {{
     *   type: u2f.MessageTypes,
     *   responseData: (u2f.Error | u2f.RegisterResponse | u2f.SignResponse),
     *   requestId: ?number
     * }}
     */
    u2f.U2fResponse;


    /**
     * An error object for responses
     * @typedef {{
     *   errorCode: u2f.ErrorCodes,
     *   errorMessage: ?string
     * }}
     */
    u2f.Error;

    /**
     * Data object for a single sign request.
     * @typedef {enum {BLUETOOTH_RADIO, BLUETOOTH_LOW_ENERGY, USB, NFC}}
     */
    u2f.Transport;


    /**
     * Data object for a single sign request.
     * @typedef {Array<u2f.Transport>}
     */
    u2f.Transports;

    /**
     * Data object for a single sign request.
     * @typedef {{
     *   version: string,
     *   challenge: string,
     *   keyHandle: string,
     *   appId: string
     * }}
     */
    u2f.SignRequest;


    /**
     * Data object for a sign response.
     * @typedef {{
     *   keyHandle: string,
     *   signatureData: string,
     *   clientData: string
     * }}
     */
    u2f.SignResponse;


    /**
     * Data object for a registration request.
     * @typedef {{
     *   version: string,
     *   challenge: string
     * }}
     */
    u2f.RegisterRequest;


    /**
     * Data object for a registration response.
     * @typedef {{
     *   version: string,
     *   keyHandle: string,
     *   transports: Transports,
     *   appId: string
     * }}
     */
    u2f.RegisterResponse;


    /**
     * Data object for a registered key.
     * @typedef {{
     *   version: string,
     *   keyHandle: string,
     *   transports: ?Transports,
     *   appId: ?string
     * }}
     */
    u2f.RegisteredKey;


    /**
     * Data object for a get API register response.
     * @typedef {{
     *   js_api_version: number
     * }}
     */
    u2f.GetJsApiVersionResponse;


    //Low level MessagePort API support

    /**
     * Sets up a MessagePort to the U2F extension using the
     * available mechanisms.
     * @param {function((MessagePort|u2f.WrappedChromeRuntimePort_))} callback
     */
    u2f.getMessagePort = function (callback) {
        if (typeof chrome != 'undefined' && chrome.runtime) {
            // The actual message here does not matter, but we need to get a reply
            // for the callback to run. Thus, send an empty signature request
            // in order to get a failure response.
            var msg = {
                type: u2f.MessageTypes.U2F_SIGN_REQUEST,
                signRequests: []
            };
            chrome.runtime.sendMessage(u2f.EXTENSION_ID, msg, function () {
                if (!chrome.runtime.lastError) {
                    // We are on a whitelisted origin and can talk directly
                    // with the extension.
                    u2f.getChromeRuntimePort_(callback);
                } else {
                    // chrome.runtime was available, but we couldn't message
                    // the extension directly, use iframe
                    u2f.getIframePort_(callback);
                }
            });
        } else if (u2f.isAndroidChrome_()) {
            u2f.getAuthenticatorPort_(callback);
        } else if (u2f.isIosChrome_()) {
            u2f.getIosPort_(callback);
        } else {
            // chrome.runtime was not available at all, which is normal
            // when this origin doesn't have access to any extensions.
            u2f.getIframePort_(callback);
        }
    };

    /**
     * Detect chrome running on android based on the browser's useragent.
     * @private
     */
    u2f.isAndroidChrome_ = function () {
        var userAgent = navigator.userAgent;
        return userAgent.indexOf('Chrome') != -1 &&
            userAgent.indexOf('Android') != -1;
    };

    /**
     * Detect chrome running on iOS based on the browser's platform.
     * @private
     */
    u2f.isIosChrome_ = function () {
        return ["iPhone", "iPad", "iPod"].indexOf(navigator.platform) > -1;
    };

    /**
     * Connects directly to the extension via chrome.runtime.connect.
     * @param {function(u2f.WrappedChromeRuntimePort_)} callback
     * @private
     */
    u2f.getChromeRuntimePort_ = function (callback) {
        var port = chrome.runtime.connect(u2f.EXTENSION_ID,
            { 'includeTlsChannelId': true });
        setTimeout(function () {
            callback(new u2f.WrappedChromeRuntimePort_(port));
        }, 0);
    };

    /**
     * Return a 'port' abstraction to the Authenticator app.
     * @param {function(u2f.WrappedAuthenticatorPort_)} callback
     * @private
     */
    u2f.getAuthenticatorPort_ = function (callback) {
        setTimeout(function () {
            callback(new u2f.WrappedAuthenticatorPort_());
        }, 0);
    };

    /**
     * Return a 'port' abstraction to the iOS client app.
     * @param {function(u2f.WrappedIosPort_)} callback
     * @private
     */
    u2f.getIosPort_ = function (callback) {
        setTimeout(function () {
            callback(new u2f.WrappedIosPort_());
        }, 0);
    };

    /**
     * A wrapper for chrome.runtime.Port that is compatible with MessagePort.
     * @param {Port} port
     * @constructor
     * @private
     */
    u2f.WrappedChromeRuntimePort_ = function (port) {
        this.port_ = port;
    };

    /**
     * Format and return a sign request compliant with the JS API version supported by the extension.
     * @param {Array<u2f.SignRequest>} signRequests
     * @param {number} timeoutSeconds
     * @param {number} reqId
     * @return {Object}
     */
    u2f.formatSignRequest_ =
        function (appId, challenge, registeredKeys, timeoutSeconds, reqId) {
            if (js_api_version === undefined || js_api_version < 1.1) {
                // Adapt request to the 1.0 JS API
                var signRequests = [];
                for (var i = 0; i < registeredKeys.length; i++) {
                    signRequests[i] = {
                        version: registeredKeys[i].version,
                        challenge: challenge,
                        keyHandle: registeredKeys[i].keyHandle,
                        appId: appId
                    };
                }
                return {
                    type: u2f.MessageTypes.U2F_SIGN_REQUEST,
                    signRequests: signRequests,
                    timeoutSeconds: timeoutSeconds,
                    requestId: reqId
                };
            }
            // JS 1.1 API
            return {
                type: u2f.MessageTypes.U2F_SIGN_REQUEST,
                appId: appId,
                challenge: challenge,
                registeredKeys: registeredKeys,
                timeoutSeconds: timeoutSeconds,
                requestId: reqId
            };
        };

    /**
     * Format and return a register request compliant with the JS API version supported by the extension..
     * @param {Array<u2f.SignRequest>} signRequests
     * @param {Array<u2f.RegisterRequest>} signRequests
     * @param {number} timeoutSeconds
     * @param {number} reqId
     * @return {Object}
     */
    u2f.formatRegisterRequest_ =
        function (appId, registeredKeys, registerRequests, timeoutSeconds, reqId) {
            if (js_api_version === undefined || js_api_version < 1.1) {
                // Adapt request to the 1.0 JS API
                for (var i = 0; i < registerRequests.length; i++) {
                    registerRequests[i].appId = appId;
                }
                var signRequests = [];
                for (var i = 0; i < registeredKeys.length; i++) {
                    signRequests[i] = {
                        version: registeredKeys[i].version,
                        challenge: registerRequests[0],
                        keyHandle: registeredKeys[i].keyHandle,
                        appId: appId
                    };
                }
                return {
                    type: u2f.MessageTypes.U2F_REGISTER_REQUEST,
                    signRequests: signRequests,
                    registerRequests: registerRequests,
                    timeoutSeconds: timeoutSeconds,
                    requestId: reqId
                };
            }
            // JS 1.1 API
            return {
                type: u2f.MessageTypes.U2F_REGISTER_REQUEST,
                appId: appId,
                registerRequests: registerRequests,
                registeredKeys: registeredKeys,
                timeoutSeconds: timeoutSeconds,
                requestId: reqId
            };
        };


    /**
     * Posts a message on the underlying channel.
     * @param {Object} message
     */
    u2f.WrappedChromeRuntimePort_.prototype.postMessage = function (message) {
        this.port_.postMessage(message);
    };


    /**
     * Emulates the HTML 5 addEventListener interface. Works only for the
     * onmessage event, which is hooked up to the chrome.runtime.Port.onMessage.
     * @param {string} eventName
     * @param {function({data: Object})} handler
     */
    u2f.WrappedChromeRuntimePort_.prototype.addEventListener =
        function (eventName, handler) {
            var name = eventName.toLowerCase();
            if (name == 'message' || name == 'onmessage') {
                this.port_.onMessage.addListener(function (message) {
                    // Emulate a minimal MessageEvent object
                    handler({ 'data': message });
                });
            } else {
                console.error('WrappedChromeRuntimePort only supports onMessage');
            }
        };

    /**
     * Wrap the Authenticator app with a MessagePort interface.
     * @constructor
     * @private
     */
    u2f.WrappedAuthenticatorPort_ = function () {
        this.requestId_ = -1;
        this.requestObject_ = null;
    }

    /**
     * Launch the Authenticator intent.
     * @param {Object} message
     */
    u2f.WrappedAuthenticatorPort_.prototype.postMessage = function (message) {
        var intentUrl =
            u2f.WrappedAuthenticatorPort_.INTENT_URL_BASE_ +
            ';S.request=' + encodeURIComponent(JSON.stringify(message)) +
            ';end';
        document.location = intentUrl;
    };

    /**
     * Tells what type of port this is.
     * @return {String} port type
     */
    u2f.WrappedAuthenticatorPort_.prototype.getPortType = function () {
        return "WrappedAuthenticatorPort_";
    };


    /**
     * Emulates the HTML 5 addEventListener interface.
     * @param {string} eventName
     * @param {function({data: Object})} handler
     */
    u2f.WrappedAuthenticatorPort_.prototype.addEventListener = function (eventName, handler) {
        var name = eventName.toLowerCase();
        if (name == 'message') {
            var self = this;
            /* Register a callback to that executes when
             * chrome injects the response. */
            window.addEventListener(
                'message', self.onRequestUpdate_.bind(self, handler), false);
        } else {
            console.error('WrappedAuthenticatorPort only supports message');
        }
    };

    /**
     * Callback invoked  when a response is received from the Authenticator.
     * @param function({data: Object}) callback
     * @param {Object} message message Object
     */
    u2f.WrappedAuthenticatorPort_.prototype.onRequestUpdate_ =
        function (callback, message) {
            var messageObject = JSON.parse(message.data);
            var intentUrl = messageObject['intentURL'];

            var errorCode = messageObject['errorCode'];
            var responseObject = null;
            if (messageObject.hasOwnProperty('data')) {
                responseObject = /** @type {Object} */ (
                    JSON.parse(messageObject['data']));
            }

            callback({ 'data': responseObject });
        };

    /**
     * Base URL for intents to Authenticator.
     * @const
     * @private
     */
    u2f.WrappedAuthenticatorPort_.INTENT_URL_BASE_ =
        'intent:#Intent;action=com.google.android.apps.authenticator.AUTHENTICATE';

    /**
     * Wrap the iOS client app with a MessagePort interface.
     * @constructor
     * @private
     */
    u2f.WrappedIosPort_ = function () { };

    /**
     * Launch the iOS client app request
     * @param {Object} message
     */
    u2f.WrappedIosPort_.prototype.postMessage = function (message) {
        var str = JSON.stringify(message);
        var url = "u2f://auth?" + encodeURI(str);
        location.replace(url);
    };

    /**
     * Tells what type of port this is.
     * @return {String} port type
     */
    u2f.WrappedIosPort_.prototype.getPortType = function () {
        return "WrappedIosPort_";
    };

    /**
     * Emulates the HTML 5 addEventListener interface.
     * @param {string} eventName
     * @param {function({data: Object})} handler
     */
    u2f.WrappedIosPort_.prototype.addEventListener = function (eventName, handler) {
        var name = eventName.toLowerCase();
        if (name !== 'message') {
            console.error('WrappedIosPort only supports message');
        }
    };

    /**
     * Sets up an embedded trampoline iframe, sourced from the extension.
     * @param {function(MessagePort)} callback
     * @private
     */
    u2f.getIframePort_ = function (callback) {
        // Create the iframe
        var iframeOrigin = 'chrome-extension://' + u2f.EXTENSION_ID;
        var iframe = document.createElement('iframe');
        iframe.src = iframeOrigin + '/u2f-comms.html';
        iframe.setAttribute('style', 'display:none');
        document.body.appendChild(iframe);

        var channel = new MessageChannel();
        var ready = function (message) {
            if (message.data == 'ready') {
                channel.port1.removeEventListener('message', ready);
                callback(channel.port1);
            } else {
                console.error('First event on iframe port was not "ready"');
            }
        };
        channel.port1.addEventListener('message', ready);
        channel.port1.start();

        iframe.addEventListener('load', function () {
            // Deliver the port to the iframe and initialize
            iframe.contentWindow.postMessage('init', iframeOrigin, [channel.port2]);
        });
    };


    //High-level JS API

    /**
     * Default extension response timeout in seconds.
     * @const
     */
    u2f.EXTENSION_TIMEOUT_SEC = 30;

    /**
     * A singleton instance for a MessagePort to the extension.
     * @type {MessagePort|u2f.WrappedChromeRuntimePort_}
     * @private
     */
    u2f.port_ = null;

    /**
     * Callbacks waiting for a port
     * @type {Array<function((MessagePort|u2f.WrappedChromeRuntimePort_))>}
     * @private
     */
    u2f.waitingForPort_ = [];

    /**
     * A counter for requestIds.
     * @type {number}
     * @private
     */
    u2f.reqCounter_ = 0;

    /**
     * A map from requestIds to client callbacks
     * @type {Object.<number,(function((u2f.Error|u2f.RegisterResponse))
     *                       |function((u2f.Error|u2f.SignResponse)))>}
     * @private
     */
    u2f.callbackMap_ = {};

    /**
     * Creates or retrieves the MessagePort singleton to use.
     * @param {function((MessagePort|u2f.WrappedChromeRuntimePort_))} callback
     * @private
     */
    u2f.getPortSingleton_ = function (callback) {
        if (u2f.port_) {
            callback(u2f.port_);
        } else {
            if (u2f.waitingForPort_.length == 0) {
                u2f.getMessagePort(function (port) {
                    u2f.port_ = port;
                    u2f.port_.addEventListener('message',
            /** @type {function(Event)} */(u2f.responseHandler_));

                    // Careful, here be async callbacks. Maybe.
                    while (u2f.waitingForPort_.length)
                        u2f.waitingForPort_.shift()(u2f.port_);
                });
            }
            u2f.waitingForPort_.push(callback);
        }
    };

    /**
     * Handles response messages from the extension.
     * @param {MessageEvent.<u2f.Response>} message
     * @private
     */
    u2f.responseHandler_ = function (message) {
        var response = message.data;
        var reqId = response['requestId'];
        if (!reqId || !u2f.callbackMap_[reqId]) {
            console.error('Unknown or missing requestId in response.');
            return;
        }
        var cb = u2f.callbackMap_[reqId];
        delete u2f.callbackMap_[reqId];
        cb(response['responseData']);
    };

    /**
     * Dispatches an array of sign requests to available U2F tokens.
     * If the JS API version supported by the extension is unknown, it first sends a
     * message to the extension to find out the supported API version and then it sends
     * the sign request.
     * @param {string=} appId
     * @param {string=} challenge
     * @param {Array<u2f.RegisteredKey>} registeredKeys
     * @param {function((u2f.Error|u2f.SignResponse))} callback
     * @param {number=} opt_timeoutSeconds
     */
    u2f.sign = function (appId, challenge, registeredKeys, callback, opt_timeoutSeconds) {
        if (js_api_version === undefined) {
            // Send a message to get the extension to JS API version, then send the actual sign request.
            u2f.getApiVersion(
                function (response) {
                    js_api_version = response['js_api_version'] === undefined ? 0 : response['js_api_version'];
                    console.log("Extension JS API Version: ", js_api_version);
                    u2f.sendSignRequest(appId, challenge, registeredKeys, callback, opt_timeoutSeconds);
                });
        } else {
            // We know the JS API version. Send the actual sign request in the supported API version.
            u2f.sendSignRequest(appId, challenge, registeredKeys, callback, opt_timeoutSeconds);
        }
    };

    /**
     * Dispatches an array of sign requests to available U2F tokens.
     * @param {string=} appId
     * @param {string=} challenge
     * @param {Array<u2f.RegisteredKey>} registeredKeys
     * @param {function((u2f.Error|u2f.SignResponse))} callback
     * @param {number=} opt_timeoutSeconds
     */
    u2f.sendSignRequest = function (appId, challenge, registeredKeys, callback, opt_timeoutSeconds) {
        u2f.getPortSingleton_(function (port) {
            var reqId = ++u2f.reqCounter_;
            u2f.callbackMap_[reqId] = callback;
            var timeoutSeconds = (typeof opt_timeoutSeconds !== 'undefined' ?
                opt_timeoutSeconds : u2f.EXTENSION_TIMEOUT_SEC);
            var req = u2f.formatSignRequest_(appId, challenge, registeredKeys, timeoutSeconds, reqId);
            port.postMessage(req);
        });
    };

    /**
     * Dispatches register requests to available U2F tokens. An array of sign
     * requests identifies already registered tokens.
     * If the JS API version supported by the extension is unknown, it first sends a
     * message to the extension to find out the supported API version and then it sends
     * the register request.
     * @param {string=} appId
     * @param {Array<u2f.RegisterRequest>} registerRequests
     * @param {Array<u2f.RegisteredKey>} registeredKeys
     * @param {function((u2f.Error|u2f.RegisterResponse))} callback
     * @param {number=} opt_timeoutSeconds
     */
    u2f.register = function (appId, registerRequests, registeredKeys, callback, opt_timeoutSeconds) {
        if (js_api_version === undefined) {
            // Send a message to get the extension to JS API version, then send the actual register request.
            u2f.getApiVersion(
                function (response) {
                    js_api_version = response['js_api_version'] === undefined ? 0 : response['js_api_version'];
                    console.log("Extension JS API Version: ", js_api_version);
                    u2f.sendRegisterRequest(appId, registerRequests, registeredKeys,
                        callback, opt_timeoutSeconds);
                });
        } else {
            // We know the JS API version. Send the actual register request in the supported API version.
            u2f.sendRegisterRequest(appId, registerRequests, registeredKeys,
                callback, opt_timeoutSeconds);
        }
    };

    /**
     * Dispatches register requests to available U2F tokens. An array of sign
     * requests identifies already registered tokens.
     * @param {string=} appId
     * @param {Array<u2f.RegisterRequest>} registerRequests
     * @param {Array<u2f.RegisteredKey>} registeredKeys
     * @param {function((u2f.Error|u2f.RegisterResponse))} callback
     * @param {number=} opt_timeoutSeconds
     */
    u2f.sendRegisterRequest = function (appId, registerRequests, registeredKeys, callback, opt_timeoutSeconds) {
        u2f.getPortSingleton_(function (port) {
            var reqId = ++u2f.reqCounter_;
            u2f.callbackMap_[reqId] = callback;
            var timeoutSeconds = (typeof opt_timeoutSeconds !== 'undefined' ?
                opt_timeoutSeconds : u2f.EXTENSION_TIMEOUT_SEC);
            var req = u2f.formatRegisterRequest_(
                appId, registeredKeys, registerRequests, timeoutSeconds, reqId);
            port.postMessage(req);
        });
    };


    /**
     * Dispatches a message to the extension to find out the supported
     * JS API version.
     * If the user is on a mobile phone and is thus using Google Authenticator instead
     * of the Chrome extension, don't send the request and simply return 0.
     * @param {function((u2f.Error|u2f.GetJsApiVersionResponse))} callback
     * @param {number=} opt_timeoutSeconds
     */
    u2f.getApiVersion = function (callback, opt_timeoutSeconds) {
        u2f.getPortSingleton_(function (port) {
            // If we are using Android Google Authenticator or iOS client app,
            // do not fire an intent to ask which JS API version to use.
            if (port.getPortType) {
                var apiVersion;
                switch (port.getPortType()) {
                    case 'WrappedIosPort_':
                    case 'WrappedAuthenticatorPort_':
                        apiVersion = 1.1;
                        break;

                    default:
                        apiVersion = 0;
                        break;
                }
                callback({ 'js_api_version': apiVersion });
                return;
            }
            var reqId = ++u2f.reqCounter_;
            u2f.callbackMap_[reqId] = callback;
            var req = {
                type: u2f.MessageTypes.U2F_GET_API_VERSION_REQUEST,
                timeoutSeconds: (typeof opt_timeoutSeconds !== 'undefined' ?
                    opt_timeoutSeconds : u2f.EXTENSION_TIMEOUT_SEC),
                requestId: reqId
            };
            port.postMessage(req);
        });
    };

    /**
     * Modification:
     * Assign u2f back to window (root) scope.
     */
    root.u2f = u2f;
}(this));

/**
 * @file Web Cryptography API shim
 * @author Artem S Vybornov <vybornov@gmail.com>
 * @license MIT
 */
!function (global) {
    'use strict';

    // We are using an angular promise polyfill which is loaded after this script
    //if (typeof Promise !== 'function')
    //    throw "Promise support required";

    var _crypto = global.crypto || global.msCrypto;
    if (!_crypto) return;

    var _subtle = _crypto.subtle || _crypto.webkitSubtle;
    if (!_subtle) return;

    var _Crypto = global.Crypto || _crypto.constructor || Object,
        _SubtleCrypto = global.SubtleCrypto || _subtle.constructor || Object,
        _CryptoKey = global.CryptoKey || global.Key || Object;

    var isIE = !!global.msCrypto,
        // ref PR: https://github.com/vibornoff/webcrypto-shim/pull/15
        isWebkit = !_crypto.subtle && !!_crypto.webkitSubtle;
    if (!isIE && !isWebkit) return;

    // Added
    global.cryptoShimmed = true;

    function s2a(s) {
        return btoa(s).replace(/\=+$/, '').replace(/\+/g, '-').replace(/\//g, '_');
    }

    function a2s(s) {
        s += '===', s = s.slice(0, -s.length % 4);
        return atob(s.replace(/-/g, '+').replace(/_/g, '/'));
    }

    function s2b(s) {
        var b = new Uint8Array(s.length);
        for (var i = 0; i < s.length; i++) b[i] = s.charCodeAt(i);
        return b;
    }

    function b2s(b) {
        if (b instanceof ArrayBuffer) b = new Uint8Array(b);
        return String.fromCharCode.apply(String, b);
    }

    function alg(a) {
        var r = { 'name': (a.name || a || '').toUpperCase().replace('V', 'v') };
        switch (r.name) {
            case 'SHA-1':
            case 'SHA-256':
            case 'SHA-384':
            case 'SHA-512':
                break;
            case 'AES-CBC':
            case 'AES-GCM':
            case 'AES-KW':
                if (a.length) r['length'] = a.length;
                break;
            case 'HMAC':
                if (a.hash) r['hash'] = alg(a.hash);
                if (a.length) r['length'] = a.length;
                break;
            case 'RSAES-PKCS1-v1_5':
                if (a.publicExponent) r['publicExponent'] = new Uint8Array(a.publicExponent);
                if (a.modulusLength) r['modulusLength'] = a.modulusLength;
                break;
            case 'RSASSA-PKCS1-v1_5':
            case 'RSA-OAEP':
                if (a.hash) r['hash'] = alg(a.hash);
                if (a.publicExponent) r['publicExponent'] = new Uint8Array(a.publicExponent);
                if (a.modulusLength) r['modulusLength'] = a.modulusLength;
                break;
            default:
                throw new SyntaxError("Bad algorithm name");
        }
        return r;
    };

    function jwkAlg(a) {
        return {
            'HMAC': {
                'SHA-1': 'HS1',
                'SHA-256': 'HS256',
                'SHA-384': 'HS384',
                'SHA-512': 'HS512',
            },
            'RSASSA-PKCS1-v1_5': {
                'SHA-1': 'RS1',
                'SHA-256': 'RS256',
                'SHA-384': 'RS384',
                'SHA-512': 'RS512',
            },
            'RSAES-PKCS1-v1_5': {
                '': 'RSA1_5',
            },
            'RSA-OAEP': {
                'SHA-1': 'RSA-OAEP',
                'SHA-256': 'RSA-OAEP-256',
            },
            'AES-KW': {
                '128': 'A128KW',
                '192': 'A192KW',
                '256': 'A256KW',
            },
            'AES-GCM': {
                '128': 'A128GCM',
                '192': 'A192GCM',
                '256': 'A256GCM',
            },
            'AES-CBC': {
                '128': 'A128CBC',
                '192': 'A192CBC',
                '256': 'A256CBC',
            },
        }[a.name][(a.hash || {}).name || a.length || ''];
    }

    function b2jwk(k) {
        if (k instanceof ArrayBuffer || k instanceof Uint8Array) k = JSON.parse(decodeURIComponent(escape(b2s(k))));
        var jwk = { 'kty': k.kty, 'alg': k.alg, 'ext': k.ext || k.extractable };
        switch (jwk.kty) {
            case 'oct':
                jwk.k = k.k;
            case 'RSA':
                ['n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi', 'oth'].forEach(function (x) { if (x in k) jwk[x] = k[x] });
                break;
            default:
                throw new TypeError("Unsupported key type");
        }
        return jwk;
    }

    function jwk2b(k) {
        var jwk = b2jwk(k);
        if (isIE) jwk['extractable'] = jwk.ext, delete jwk.ext;
        return s2b(unescape(encodeURIComponent(JSON.stringify(jwk)))).buffer;
    }

    function pkcs2jwk(k) {
        var info = b2der(k), prv = false;
        if (info.length > 2) prv = true, info.shift(); // remove version from PKCS#8 PrivateKeyInfo structure
        var jwk = { 'ext': true };
        switch (info[0][0]) {
            case '1.2.840.113549.1.1.1':
                var rsaComp = ['n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi'],
                    rsaKey = b2der(info[1]);
                if (prv) rsaKey.shift(); // remove version from PKCS#1 RSAPrivateKey structure
                for (var i = 0; i < rsaKey.length; i++) {
                    if (!rsaKey[i][0]) rsaKey[i] = rsaKey[i].subarray(1);
                    jwk[rsaComp[i]] = s2a(b2s(rsaKey[i]));
                }
                jwk['kty'] = 'RSA';
                break;
            default:
                throw new TypeError("Unsupported key type");
        }
        return jwk;
    }

    function jwk2pkcs(k) {
        var key, info = [['', null]], prv = false;
        switch (k.kty) {
            case 'RSA':
                var rsaComp = ['n', 'e', 'd', 'p', 'q', 'dp', 'dq', 'qi'],
                    rsaKey = [];
                for (var i = 0; i < rsaComp.length; i++) {
                    if (!(rsaComp[i] in k)) break;
                    var b = rsaKey[i] = s2b(a2s(k[rsaComp[i]]));
                    if (b[0] & 0x80) rsaKey[i] = new Uint8Array(b.length + 1), rsaKey[i].set(b, 1);
                }
                if (rsaKey.length > 2) prv = true, rsaKey.unshift(new Uint8Array([0])); // add version to PKCS#1 RSAPrivateKey structure
                info[0][0] = '1.2.840.113549.1.1.1';
                key = rsaKey;
                break;
            default:
                throw new TypeError("Unsupported key type");
        }
        info.push(new Uint8Array(der2b(key)).buffer);
        if (!prv) info[1] = { 'tag': 0x03, 'value': info[1] };
        else info.unshift(new Uint8Array([0])); // add version to PKCS#8 PrivateKeyInfo structure
        return new Uint8Array(der2b(info)).buffer;
    }

    var oid2str = { 'KoZIhvcNAQEB': '1.2.840.113549.1.1.1' },
        str2oid = { '1.2.840.113549.1.1.1': 'KoZIhvcNAQEB' };

    function b2der(buf, ctx) {
        if (buf instanceof ArrayBuffer) buf = new Uint8Array(buf);
        if (!ctx) ctx = { pos: 0, end: buf.length };

        if (ctx.end - ctx.pos < 2 || ctx.end > buf.length) throw new RangeError("Malformed DER");

        var tag = buf[ctx.pos++],
            len = buf[ctx.pos++];

        if (len >= 0x80) {
            len &= 0x7f;
            if (ctx.end - ctx.pos < len) throw new RangeError("Malformed DER");
            for (var xlen = 0; len--;) xlen <<= 8, xlen |= buf[ctx.pos++];
            len = xlen;
        }

        if (ctx.end - ctx.pos < len) throw new RangeError("Malformed DER");

        var rv;

        switch (tag) {
            case 0x02: // Universal Primitive INTEGER
                rv = buf.subarray(ctx.pos, ctx.pos += len);
                break;
            case 0x03: // Universal Primitive BIT STRING
                if (buf[ctx.pos++]) throw new Error("Unsupported bit string");
                len--;
            case 0x04: // Universal Primitive OCTET STRING
                rv = new Uint8Array(buf.subarray(ctx.pos, ctx.pos += len)).buffer;
                break;
            case 0x05: // Universal Primitive NULL
                rv = null;
                break;
            case 0x06: // Universal Primitive OBJECT IDENTIFIER
                var oid = btoa(b2s(buf.subarray(ctx.pos, ctx.pos += len)));
                if (!(oid in oid2str)) throw new Error("Unsupported OBJECT ID " + oid);
                rv = oid2str[oid];
                break;
            case 0x30: // Universal Constructed SEQUENCE
                rv = [];
                for (var end = ctx.pos + len; ctx.pos < end;) rv.push(b2der(buf, ctx));
                break;
            default:
                throw new Error("Unsupported DER tag 0x" + tag.toString(16));
        }

        return rv;
    }

    function der2b(val, buf) {
        if (!buf) buf = [];

        var tag = 0, len = 0,
            pos = buf.length + 2;

        buf.push(0, 0); // placeholder

        if (val instanceof Uint8Array) {  // Universal Primitive INTEGER
            tag = 0x02, len = val.length;
            for (var i = 0; i < len; i++) buf.push(val[i]);
        }
        else if (val instanceof ArrayBuffer) { // Universal Primitive OCTET STRING
            tag = 0x04, len = val.byteLength, val = new Uint8Array(val);
            for (var i = 0; i < len; i++) buf.push(val[i]);
        }
        else if (val === null) { // Universal Primitive NULL
            tag = 0x05, len = 0;
        }
        else if (typeof val === 'string' && val in str2oid) { // Universal Primitive OBJECT IDENTIFIER
            var oid = s2b(atob(str2oid[val]));
            tag = 0x06, len = oid.length;
            for (var i = 0; i < len; i++) buf.push(oid[i]);
        }
        else if (val instanceof Array) { // Universal Constructed SEQUENCE
            for (var i = 0; i < val.length; i++) der2b(val[i], buf);
            tag = 0x30, len = buf.length - pos;
        }
        else if (typeof val === 'object' && val.tag === 0x03 && val.value instanceof ArrayBuffer) { // Tag hint
            val = new Uint8Array(val.value), tag = 0x03, len = val.byteLength;
            buf.push(0); for (var i = 0; i < len; i++) buf.push(val[i]);
            len++;
        }
        else {
            throw new Error("Unsupported DER value " + val);
        }

        if (len >= 0x80) {
            var xlen = len, len = 4;
            buf.splice(pos, 0, (xlen >> 24) & 0xff, (xlen >> 16) & 0xff, (xlen >> 8) & 0xff, xlen & 0xff);
            while (len > 1 && !(xlen >> 24)) xlen <<= 8, len--;
            if (len < 4) buf.splice(pos, 4 - len);
            len |= 0x80;
        }

        buf.splice(pos - 2, 2, tag, len);

        return buf;
    }

    function CryptoKey(key, alg, ext, use) {
        Object.defineProperties(this, {
            _key: {
                value: key
            },
            type: {
                value: key.type,
                enumerable: true,
            },
            extractable: {
                value: (ext === undefined) ? key.extractable : ext,
                enumerable: true,
            },
            algorithm: {
                value: (alg === undefined) ? key.algorithm : alg,
                enumerable: true,
            },
            usages: {
                value: (use === undefined) ? key.usages : use,
                enumerable: true,
            },
        });
    }

    function isPubKeyUse(u) {
        return u === 'verify' || u === 'encrypt' || u === 'wrapKey';
    }

    function isPrvKeyUse(u) {
        return u === 'sign' || u === 'decrypt' || u === 'unwrapKey';
    }

    ['generateKey', 'importKey', 'unwrapKey']
        .forEach(function (m) {
            var _fn = _subtle[m];

            _subtle[m] = function (a, b, c) {
                var args = [].slice.call(arguments),
                    ka, kx, ku;

                switch (m) {
                    case 'generateKey':
                        ka = alg(a), kx = b, ku = c;
                        break;
                    case 'importKey':
                        ka = alg(c), kx = args[3], ku = args[4];
                        if (a === 'jwk') {
                            b = b2jwk(b);
                            if (!b.alg) b.alg = jwkAlg(ka);
                            if (!b.key_ops) b.key_ops = (b.kty !== 'oct') ? ('d' in b) ? ku.filter(isPrvKeyUse) : ku.filter(isPubKeyUse) : ku.slice();
                            args[1] = jwk2b(b);
                        }
                        break;
                    case 'unwrapKey':
                        ka = args[4], kx = args[5], ku = args[6];
                        args[2] = c._key;
                        break;
                }

                if (m === 'generateKey' && ka.name === 'HMAC' && ka.hash) {
                    ka.length = ka.length || { 'SHA-1': 512, 'SHA-256': 512, 'SHA-384': 1024, 'SHA-512': 1024 }[ka.hash.name];
                    return _subtle.importKey('raw', _crypto.getRandomValues(new Uint8Array((ka.length + 7) >> 3)), ka, kx, ku);
                }

                if (isWebkit && m === 'generateKey' && ka.name === 'RSASSA-PKCS1-v1_5' && (!ka.modulusLength || ka.modulusLength >= 2048)) {
                    a = alg(a), a.name = 'RSAES-PKCS1-v1_5', delete a.hash;
                    return _subtle.generateKey(a, true, ['encrypt', 'decrypt'])
                        .then(function (k) {
                            return Promise.all([
                                _subtle.exportKey('jwk', k.publicKey),
                                _subtle.exportKey('jwk', k.privateKey),
                            ]);
                        })
                        .then(function (keys) {
                            keys[0].alg = keys[1].alg = jwkAlg(ka);
                            keys[0].key_ops = ku.filter(isPubKeyUse), keys[1].key_ops = ku.filter(isPrvKeyUse);
                            return Promise.all([
                                _subtle.importKey('jwk', keys[0], ka, true, keys[0].key_ops),
                                _subtle.importKey('jwk', keys[1], ka, kx, keys[1].key_ops),
                            ]);
                        })
                        .then(function (keys) {
                            return {
                                publicKey: keys[0],
                                privateKey: keys[1],
                            };
                        });
                }

                if ((isWebkit || (isIE && (ka.hash || {}).name === 'SHA-1'))
                    && m === 'importKey' && a === 'jwk' && ka.name === 'HMAC' && b.kty === 'oct') {
                    return _subtle.importKey('raw', s2b(a2s(b.k)), c, args[3], args[4]);
                }

                if (isWebkit && m === 'importKey' && (a === 'spki' || a === 'pkcs8')) {
                    return _subtle.importKey('jwk', pkcs2jwk(b), c, args[3], args[4]);
                }

                if (isIE && m === 'unwrapKey') {
                    return _subtle.decrypt(args[3], c, b)
                        .then(function (k) {
                            return _subtle.importKey(a, k, args[4], args[5], args[6]);
                        });
                }

                var op;
                try {
                    op = _fn.apply(_subtle, args);
                }
                catch (e) {
                    return Promise.reject(e);
                }

                if (isIE) {
                    op = new Promise(function (res, rej) {
                        op.onabort =
                            op.onerror = function (e) { rej(e) };
                        op.oncomplete = function (r) { res(r.target.result) };
                    });
                }

                op = op.then(function (k) {
                    if (ka.name === 'HMAC') {
                        if (!ka.length) ka.length = 8 * k.algorithm.length;
                    }
                    if (ka.name.search('RSA') == 0) {
                        if (!ka.modulusLength) ka.modulusLength = (k.publicKey || k).algorithm.modulusLength;
                        if (!ka.publicExponent) ka.publicExponent = (k.publicKey || k).algorithm.publicExponent;
                    }
                    if (k.publicKey && k.privateKey) {
                        k = {
                            publicKey: new CryptoKey(k.publicKey, ka, kx, ku.filter(isPubKeyUse)),
                            privateKey: new CryptoKey(k.privateKey, ka, kx, ku.filter(isPrvKeyUse)),
                        };
                    }
                    else {
                        k = new CryptoKey(k, ka, kx, ku);
                    }
                    return k;
                });

                return op;
            }
        });

    ['exportKey', 'wrapKey']
        .forEach(function (m) {
            var _fn = _subtle[m];

            _subtle[m] = function (a, b, c) {
                var args = [].slice.call(arguments);

                switch (m) {
                    case 'exportKey':
                        args[1] = b._key;
                        break;
                    case 'wrapKey':
                        args[1] = b._key, args[2] = c._key;
                        break;
                }

                if ((isWebkit || (isIE && (b.algorithm.hash || {}).name === 'SHA-1'))
                    && m === 'exportKey' && a === 'jwk' && b.algorithm.name === 'HMAC') {
                    args[0] = 'raw';
                }

                if (isWebkit && m === 'exportKey' && (a === 'spki' || a === 'pkcs8')) {
                    args[0] = 'jwk';
                }

                if (isIE && m === 'wrapKey') {
                    return _subtle.exportKey(a, b)
                        .then(function (k) {
                            if (a === 'jwk') k = s2b(unescape(encodeURIComponent(JSON.stringify(b2jwk(k)))));
                            return _subtle.encrypt(args[3], c, k);
                        });
                }

                var op;
                try {
                    op = _fn.apply(_subtle, args);
                }
                catch (e) {
                    return Promise.reject(e);
                }

                if (isIE) {
                    op = new Promise(function (res, rej) {
                        op.onabort =
                            op.onerror = function (e) { rej(e) };
                        op.oncomplete = function (r) { res(r.target.result) };
                    });
                }

                if (m === 'exportKey' && a === 'jwk') {
                    op = op.then(function (k) {
                        if ((isWebkit || (isIE && (b.algorithm.hash || {}).name === 'SHA-1'))
                            && b.algorithm.name === 'HMAC') {
                            return { 'kty': 'oct', 'alg': jwkAlg(b.algorithm), 'key_ops': b.usages.slice(), 'ext': true, 'k': s2a(b2s(k)) };
                        }
                        k = b2jwk(k);
                        if (!k.alg) k['alg'] = jwkAlg(b.algorithm);
                        if (!k.key_ops) k['key_ops'] = (b.type === 'public') ? b.usages.filter(isPubKeyUse) : (b.type === 'private') ? b.usages.filter(isPrvKeyUse) : b.usages.slice();
                        return k;
                    });
                }

                if (isWebkit && m === 'exportKey' && (a === 'spki' || a === 'pkcs8')) {
                    op = op.then(function (k) {
                        k = jwk2pkcs(b2jwk(k));
                        return k;
                    });
                }

                return op;
            }
        });

    ['encrypt', 'decrypt', 'sign', 'verify']
        .forEach(function (m) {
            var _fn = _subtle[m];

            _subtle[m] = function (a, b, c, d) {
                if (isIE && (!c.byteLength || (d && !d.byteLength)))
                    throw new Error("Empy input is not allowed");

                var args = [].slice.call(arguments),
                    ka = alg(a);

                if (isIE && m === 'decrypt' && ka.name === 'AES-GCM') {
                    var tl = a.tagLength >> 3;
                    args[2] = (c.buffer || c).slice(0, c.byteLength - tl),
                        a.tag = (c.buffer || c).slice(c.byteLength - tl);
                }

                args[1] = b._key;

                var op;
                try {
                    op = _fn.apply(_subtle, args);
                }
                catch (e) {
                    return Promise.reject(e);
                }

                if (isIE) {
                    op = new Promise(function (res, rej) {
                        op.onabort =
                            op.onerror = function (e) {
                                rej(e);
                            };

                        op.oncomplete = function (r) {
                            var r = r.target.result;

                            if (m === 'encrypt' && r instanceof AesGcmEncryptResult) {
                                var c = r.ciphertext, t = r.tag;
                                r = new Uint8Array(c.byteLength + t.byteLength);
                                r.set(new Uint8Array(c), 0);
                                r.set(new Uint8Array(t), c.byteLength);
                                r = r.buffer;
                            }

                            res(r);
                        };
                    });
                }

                return op;
            }
        });

    if (isIE) {
        var _digest = _subtle.digest;

        _subtle['digest'] = function (a, b) {
            if (!b.byteLength)
                throw new Error("Empy input is not allowed");

            var op;
            try {
                op = _digest.call(_subtle, a, b);
            }
            catch (e) {
                return Promise.reject(e);
            }

            op = new Promise(function (res, rej) {
                op.onabort =
                    op.onerror = function (e) { rej(e) };
                op.oncomplete = function (r) { res(r.target.result) };
            });

            return op;
        };

        global.crypto = Object.create(_crypto, {
            getRandomValues: { value: function (a) { return _crypto.getRandomValues(a) } },
            subtle: { value: _subtle },
        });

        global.CryptoKey = CryptoKey;
    }

    if (isWebkit) {
        _crypto.subtle = _subtle;

        global.Crypto = _Crypto;
        global.SubtleCrypto = _SubtleCrypto;
        global.CryptoKey = CryptoKey;
    }
}(typeof window === 'undefined' ? typeof self === 'undefined' ? this : self : window);