made generate salt and hashpassword

src/main/java/dao/UserDAO.java

@@ -2,6 +2,7 @@ package dao;
 
 import data.User;
 
+import java.io.NotActiveException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
@@ -183,7 +184,12 @@ public class UserDAO {
      * @return a random salt
      */
     public byte[] generateSalt() {
-        return null;
+        byte salt[];
+        SecureRandom random = new SecureRandom();
+        salt = new byte[16];
+        random.nextBytes(salt);
+        return salt;
+
     }
 
     /**
@@ -193,6 +199,25 @@ public class UserDAO {
      * @return hashedPassword, null if unsuccessful
      */
     public String hashPassword(String password, byte[] salt){
+        try {
+            MessageDigest md = MessageDigest.getInstance("SHA-512");
+            md.update(password.getBytes());
+            byte[] bytes = md.digest();
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < bytes.length; i++) {
+                sb.append(Integer.toString((bytes[i] & 0xff) + 0x100));
+            }
+            String hashedPassword = sb.toString();
+            StringBuilder hb = new StringBuilder();
+            for (byte b : salt) {
+                sb.append(String.format("%02x", b));
+            }
+            String salted = hb.toString();
+            return hashedPassword+"|"+salted;
+
+        }catch (NoSuchAlgorithmException e){
+            e.printStackTrace();
+        }
         return null;
     }