assignment 3

assignments/assignment3/Twofish.java

@@ -0,0 +1,31 @@
+import java.util.Base64;
+
+public class Twofish implements Cryptable {
+    private static final String SECRET_KEY = "AnotherSecretKey";  // Simple key for XOR
+
+    @Override
+    public String encrypt(String data) {
+        byte[] dataBytes = data.getBytes();
+        byte[] encryptedData = new byte[dataBytes.length];
+
+        // XOR encryption
+        for (int i = 0; i < dataBytes.length; i++) {
+            encryptedData[i] = (byte) (dataBytes[i] ^ SECRET_KEY.charAt(i % SECRET_KEY.length()));
+        }
+
+        return Base64.getEncoder().encodeToString(encryptedData);
+    }
+
+    @Override
+    public String decrypt(String cryptedData) {
+        byte[] encryptedData = Base64.getDecoder().decode(cryptedData);
+        byte[] decryptedData = new byte[encryptedData.length];
+
+        // XOR decryption (same as encryption)
+        for (int i = 0; i < encryptedData.length; i++) {
+            decryptedData[i] = (byte) (encryptedData[i] ^ SECRET_KEY.charAt(i % SECRET_KEY.length()));
+        }
+
+        return new String(decryptedData);
+    }
+}