feat: update SecurityUtil.java to accomodate hash and salt

src/main/java/edujin/util/SecurityUtil.java

 package edujin.util;
+
+import org.springframework.security.crypto.bcrypt.BCrypt;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 
 import java.security.SecureRandom;
@@ -20,8 +22,20 @@ public class SecurityUtil {
         return sb.toString();
     }
 
-    public static void main(String[] args) {
-        String randomString = generateRandomString(32); // Change 16 to desired length
-        System.out.println("Random String: " + randomString);
+    public static String hashPassword(String password) {
+        // Already salted
+        BCryptPasswordEncoder encoder = new BCryptPasswordEncoder(12);
+        return encoder.encode(password);
+    }
+
+    public static Boolean checkPassword(String enteredPassword, String hashedPassword) {
+        return BCrypt.checkpw(enteredPassword, hashedPassword);
+    }
+
+    public static void main (String[] args) {
+        String pw = "vjrcYqbuYaCnLCDE7bm7ZU99lGfEZCJx";
+        String hashedPassword = hashPassword(pw);
+        Boolean b = BCrypt.checkpw(pw, hashedPassword);
+        System.out.println(b);
     }
 }