Improvements of stringArrayEncoding: base64 and rc4

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

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

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

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

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

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

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

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

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

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

src/utils/CryptUtils.ts

@@ -32,7 +32,8 @@ export class CryptUtils implements ICryptUtils {
      * @returns {string}
      */
     public btoa (string: string): string {
-        const chars: string = `${alphabetStringUppercase}${alphabetString}${numbersString}+/=`;
+        // swapped lowercase and uppercase groups of alphabet to prevent easy decode!!!!
+        const chars: string = `${alphabetString}${alphabetStringUppercase}${numbersString}+/=`;
 
         let output: string = '';