Fix line endings

src/main/java/step1/Main.java

@@ -10,14 +10,12 @@ import java.net.*;
 import java.nio.charset.StandardCharsets;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
-import java.util.ArrayList;
 import java.util.Base64;
-import java.util.List;
 
 public class Main {
 
     private static final String ALGORITHM = "DESede";
-    private static final String TRANSFORMATION = "DESede/CBC/PKCS5Padding";
+    private static final String TRANSFORMATION = "DESede/ECB/PKCS5Padding";
 
     public static void main(String[] args){
 
@@ -39,10 +37,9 @@ public class Main {
             SecretKey key = get3DESKey();
             byte[] encodedKey = key.getEncoded();
             String base64Key = Base64.getEncoder().encodeToString(encodedKey);
-            String formattedKey = String.format("%s\r\n", base64Key);
 
             //Sending the key
-            send(socket, formattedKey);
+            send(socket, base64Key);
             System.out.println("Key sent to server.");
 
             //Reading the message sent by the server
@@ -50,7 +47,7 @@ public class Main {
             System.out.println("Received message: " + text);
 
             //Encrypting the message
-            String encryptedMessage = encrypt(encodedKey, text);
+            String encryptedMessage = encrypt(key, text);
             String base64Message = Base64.getEncoder().encodeToString(encryptedMessage.getBytes());
             System.out.println("Encrypted message to send : " + encryptedMessage);
 
@@ -70,8 +67,7 @@ public class Main {
 
     public static void send(Socket socket, String message) throws IOException {
         OutputStream output = socket.getOutputStream();
-
-        output.write(message.getBytes(StandardCharsets.UTF_8));
+        output.write(String.format("%s\r\n", message).getBytes(StandardCharsets.UTF_8));
         output.flush();
     }
 
@@ -85,25 +81,13 @@ public class Main {
         return keyGen.generateKey();
     }
 
-    public static String encrypt(byte[] keyBytes, String plaintext) throws Exception {
-        SecretKey key = new SecretKeySpec(keyBytes, ALGORITHM);
-
-        byte[] iv = new byte[8];
-        new SecureRandom().nextBytes(iv);
-        IvParameterSpec ivSpec = new IvParameterSpec(iv);
-
+    public static String encrypt(SecretKey key, String message) throws Exception {
         Cipher cipher = Cipher.getInstance(TRANSFORMATION);
-        cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
+        cipher.init(Cipher.ENCRYPT_MODE, key);
 
-        byte[] plaintextBytes = plaintext.getBytes(StandardCharsets.UTF_8);
-        byte[] ciphertext = cipher.doFinal(plaintextBytes);
+        byte[] ciphertext = cipher.doFinal(message.getBytes());
 
-        // Prepend IV to ciphertext so receiver can extract it
-        byte[] ivPlusCipher = new byte[iv.length + ciphertext.length];
-        System.arraycopy(iv, 0, ivPlusCipher, 0, iv.length);
-        System.arraycopy(ciphertext, 0, ivPlusCipher, iv.length, ciphertext.length);
-
-        return Base64.getEncoder().encodeToString(ivPlusCipher);
+        return Base64.getEncoder().encodeToString(ciphertext);
     }
 
     public static String decrypt(byte[] keyBytes, String base64IvAndCiphertext) throws Exception {