TD-3: Create Player Service with Password Methods

src/main/java/de/towerdefence/server/player/Player.java

@@ -15,6 +15,8 @@ import jakarta.persistence.*;
 @Entity
 @Table(name = "player")
 public class Player {
+    public static final int PASSWORD_SALT_BYTE_LENGTH = 16;
+    public static final int PASSWORD_HASH_BYTE_LENGTH = 64;
 
     @Id
     private Long id;
@@ -24,10 +26,10 @@ public class Player {
     private String username;
 
     @NotNull
-    @Size(min = 64, max = 64)
+    @Size(min = PASSWORD_HASH_BYTE_LENGTH, max = PASSWORD_HASH_BYTE_LENGTH)
     private byte[] passwordHash;
 
     @NotNull
-    @Size(min = 16, max = 16)
+    @Size(min = PASSWORD_SALT_BYTE_LENGTH, max = PASSWORD_SALT_BYTE_LENGTH)
     private byte[] passwordSalt;
 }

src/main/java/de/towerdefence/server/player/PlayerService.java

@@ -32,7 +32,7 @@ public class PlayerService {
     }
 
     public void setPassword(Player player, String password) throws NoSuchAlgorithmException {
-        byte[] salt = new byte[16];
+        byte[] salt = new byte[Player.PASSWORD_SALT_BYTE_LENGTH];
         this.random.nextBytes(salt);
 
         byte[] passwordHash = hashPassword(