10000 Improvements of `stringArrayEncoding`: `base64` and `rc4` · sec-js/javascript-obfuscator@7eb25bb · GitHub
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sanex3339
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Improvements of stringArrayEncoding: base64 and rc4 
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‎CHANGELOG.md

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@@ -1,5 +1,9 @@
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Change Log
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v1.3.0
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---
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* Improvements of `stringArrayEncoding`: `base64` and `rc4`
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v1.2.2
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---
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* Fixed performance regression of `Initializing` stage after `1.2.0`

‎dist/index.browser.js

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‎dist/index.cli.js

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‎dist/index.js

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‎package.json

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@@ -1,6 +1,6 @@
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{
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"name": "javascript-obfuscator",
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"version": "1.2.2",
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"version": "1.3.0",
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"description": "JavaScript obfuscator",
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"keywords": [
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"obfuscator",

‎src/custom-code-helpers/string-array/StringArrayCallsWrapperCodeHelper.ts

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@@ -10,13 +10,11 @@ import { IEscapeSequenceEncoder } from '../../interfaces/utils/IEscapeSequenceEn
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import { IOptions } from '../../interfaces/options/IOptions';
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import { IRandomGenerator } from '../../interfaces/utils/IRandomGenerator';
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13-
import { ObfuscationTarget } from '../../enums/ObfuscationTarget';
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import { StringArrayEncoding } from '../../enums/StringArrayEncoding';
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import { initializable } from '../../decorators/Initializable';
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import { AtobTemplate } from './templates/string-array-calls-wrapper/AtobTemplate';
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import { GlobalVariableNoEvalTemplate } from '../common/templates/GlobalVariableNoEvalTemplate';
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import { Rc4Template } from './templates/string-array-calls-wrapper/Rc4Template';
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import { SelfDefendingTemplate } from './templates/string-array-calls-wrapper/SelfDefendingTemplate';
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import { StringArrayBase64DecodeTemplate } from './templates/string-array-calls-wrapper/StringArrayBase64DecodeTemplate';
@@ -28,6 +26,12 @@ import { NodeUtils } from '../../node/NodeUtils';
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@injectable()
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export class StringArrayCallsWrapperCodeHelper extends AbstractCustomCodeHelper {
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/**
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* @type {string}
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*/
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@initializable()
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private atobFunctionName!: string;
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/**
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* @type {string}
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*/
@@ -76,13 +80,16 @@ export class StringArrayCallsWrapperCodeHelper extends AbstractCustomCodeHelper
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/**
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* @param {string} stringArrayName
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* @param {string} stringArrayCallsWrapperName
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* @param {string} atobFunctionName
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*/
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public initialize (
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stringArrayName: string,
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stringArrayCallsWrapperName: string
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stringArrayCallsWrapperName: string,
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atobFunctionName: string
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): void {
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this.stringArrayName = stringArrayName;
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this.stringArrayCallsWrapperName = stringArrayCallsWrapperName;
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this.atobFunctionName = atobFunctionName;
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}
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/**
@@ -117,10 +124,12 @@ export class StringArrayCallsWrapperCodeHelper extends AbstractCustomCodeHelper
117124
* @returns {string}
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*/
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private getDecodeStringArrayTemplate (): string {
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const globalVariableTemplate: string = this.options.target !== ObfuscationTarget.BrowserNoEval
121-
? this.getGlobalVariableTemplate()
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: GlobalVariableNoEvalTemplate();
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const atobPolyfill: string = this.customCodeHelperFormatter.formatTemplate(AtobTemplate(), { globalVariableTemplate });
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const atobPolyfill: string = this.customCodeHelperFormatter.formatTemplate(AtobTemplate(), {
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atobFunctionName: this.atobFunctionName
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});
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const rc4Polyfill: string = this.customCodeHelperFormatter.formatTemplate(Rc4Template(), {
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atobFunctionName: this.atobFunctionName
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});
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let decodeStringArrayTemplate: string = '';
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let selfDefendingCode: string = '';
@@ -144,8 +153,8 @@ export class StringArrayCallsWrapperCodeHelper extends AbstractCustomCodeHelper
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StringArrayRC4DecodeTemplate(this.randomGenerator),
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{
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atobPolyfill,
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rc4Polyfill,
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selfDefendingCode,
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rc4Polyfill: Rc4Template(),
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stringArrayCallsWrapperName: this.stringArrayCallsWrapperName
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}
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);
@@ -157,6 +166,7 @@ export class StringArrayCallsWrapperCodeHelper extends AbstractCustomCodeHelper
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StringArrayBase64DecodeTemplate(this.randomGenerator),
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{
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atobPolyfill,
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atobFunctionName: this.atobFunctionName,
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selfDefendingCode,
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stringArrayCallsWrapperName: this.stringArrayCallsWrapperName
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}

‎src/custom-code-helpers/string-array/group/StringArrayCodeHelperGroup.ts

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@@ -118,9 +118,10 @@ export class StringArrayCodeHelperGroup extends AbstractCustomCodeHelperGroup {
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const stringArrayName: string = this.stringArrayStorage.getStorageName();
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const stringArrayCallsWrapperName: string = this.stringArrayStorage.getStorageCallsWrapperName();
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const stringArrayRotationAmount: number = this.stringArrayStorage.getRotationAmount();
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const atobFunctionName: string = this.randomGenerator.getRandomString(6);
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stringArrayCodeHelper.initialize(this.stringArrayStorage, stringArrayName);
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stringArrayCallsWrapperCodeHelper.initialize(stringArrayName, stringArrayCallsWrapperName);
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stringArrayCallsWrapperCodeHelper.initialize(stringArrayName, stringArrayCallsWrapperName, atobFunctionName);
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stringArrayRotateFunctionCodeHelper.initialize(stringArrayName, stringArrayRotationAmount);
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this.customCodeHelpers.set(CustomCodeHelper.StringArray, stringArrayCodeHelper);

‎src/custom-code-helpers/string-array/templates/string-array-calls-wrapper/AtobTemplate.ts

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@@ -6,27 +6,22 @@ import { numbersString } from '../../../../constants/NumbersString';
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* @returns {string}
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*/
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export function AtobTemplate (): string {
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// swapped lowercase and uppercase groups of alphabet to prevent easy decode!!!!
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return `
10-
(function () {
11-
{globalVariableTemplate}
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const chars = '${alphabetStringUppercase}${alphabetString}${numbersString}+/=';
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var {atobFunctionName} = function (input) {
12+
const chars = '${alphabetString}${alphabetStringUppercase}${numbersString}+/=';
1413
15-
that.atob || (
16-
that.atob = function(input) {
17-
const str = String(input).replace(/=+$/, '');
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let output = '';
19-
for (
20-
let bc = 0, bs, buffer, idx = 0;
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buffer = str.charAt(idx++);
22-
~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
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bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
24-
) {
25-
buffer = chars.indexOf(buffer);
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}
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return output;
28-
}
29-
);
30-
})();
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const str = String(input).replace(/=+$/, '');
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let output = '';
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for (
17+
let bc = 0, bs, buffer, idx = 0;
18+
buffer = str.charAt(idx++);
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~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
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bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
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) {
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buffer = chars.indexOf(buffer);
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}
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return output;
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};
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`;
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}

‎src/custom-code-helpers/string-array/templates/string-array-calls-wrapper/Rc4Template.ts

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@@ -6,7 +6,7 @@ export function Rc4Template (): string {
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const rc4 = function (str, key) {
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let s = [], j = 0, x, res = '', newStr = '';
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9-
str = atob(str);
9+
str = {atobFunctionName}(str);
1010
1111
for (let k = 0, length = str.length; k < length; k++) {
1212
newStr += '%' + ('00' + str.charCodeAt(k).toString(16)).slice(-2);

‎src/custom-code-helpers/string-array/templates/string-array-calls-wrapper/StringArrayBase64DecodeTemplate.ts

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@@ -18,7 +18,7 @@ export function StringArrayBase64DecodeTemplate (
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{atobPolyfill}
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{stringArrayCallsWrapperName}.${base64DecodeFunctionIdentifier} = function (str) {
21-
const string = atob(str);
21+
const string = {atobFunctionName}(str);
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let newStringChars = [];
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for (let i = 0, length = string.length; i < length; i++) {

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