diff --git a/src/main/java/model/User.java b/src/main/java/model/User.java
index 0a49865..28590b2 100644
--- a/src/main/java/model/User.java
+++ b/src/main/java/model/User.java
@@ -1,4 +1,43 @@
 package model;
 
+import password.PasswordHash;
+
 public class User {
+  private final String userName;
+  private final String phoneNumber;
+  private final String eMail;
+  private final PasswordHash password;
+
+  public User(String userName, String phoneNumber, PasswordHash password, String eMail) {
+    this.userName = userName;
+    this.phoneNumber = phoneNumber;
+    this.eMail = eMail;
+    this.password = password;
+
+    if ( userName == null || userName.isBlank() ) {
+      throw new IllegalArgumentException("Username has to be filled in");
+    }
+
+    if ( eMail == null || eMail.isBlank() ) {
+      throw new IllegalArgumentException("E-mail has to be filled in");
+    }
+
+    if ( phoneNumber == null || phoneNumber.isBlank() ) {
+      throw new IllegalArgumentException("Phonenumber has to be filled in");
+    }
+
+    if ( phoneNumber.length() != 8 ) {
+      throw new IllegalArgumentException("Fill in a phonenumber with 8 digits");
+    }
+  }
+
+  public String getUsername() { return userName; }
+
+  public String getPhoneNumber() { return phoneNumber; }
+
+  public String getEMail() { return eMail; }
+
+  public PasswordHash getPasswordHash() { return password; }
+
+
 }
diff --git a/src/main/java/password/PasswordHash.java b/src/main/java/password/PasswordHash.java
index 796f855..cda7ced 100644
--- a/src/main/java/password/PasswordHash.java
+++ b/src/main/java/password/PasswordHash.java
@@ -1,4 +1,26 @@
 package password;
 
+import java.security.MessageDigest;
+
 public class PasswordHash {
+
+    public static String hash(String password) {
+      try {
+        MessageDigest md = MessageDigest.getInstance("SHA-256");
+        byte[] hashedBytes = md.digest(password.getBytes());
+
+        StringBuilder sb = new StringBuilder();
+        for (byte b : hashedBytes) {
+          sb.append(String.format("%02x", b));
+        }
+        return sb.toString();
+      } catch (Exception e) {
+        throw new RuntimeException("Feil ved hashing: ", e);
+      }
+    }
+
+    public static boolean mathches(String password, String hashedPassword) {
+      String newHash = hash(password);
+      return newHash.equals(hashedPassword);
+    }
 }
diff --git a/src/main/java/register/UserRegister.java b/src/main/java/register/UserRegister.java
index db37c81..398cee3 100644
--- a/src/main/java/register/UserRegister.java
+++ b/src/main/java/register/UserRegister.java
@@ -1,4 +1,20 @@
 package register;
 
+import java.util.HashMap;
+import java.util.Map;
+import model.User;
+
 public class UserRegister {
+  private final Map<String, User> users;
+
+
+  public UserRegister(String userName, User user) {
+    this.users = new HashMap<>();
+  }
+
+  public void addUser(User user) {
+    if (!users.containsKey(user.getUsername())) {
+      users.put(user.getUsername(), user);
+    }
+  }
 }
diff --git a/src/main/java/service/AuthService.java b/src/main/java/service/AuthService.java
new file mode 100644
index 0000000..c60b35e
--- /dev/null
+++ b/src/main/java/service/AuthService.java
@@ -0,0 +1,4 @@
+package service;
+
+public class AuthService {
+}