From 5637d8e53fad9f62f079a4dece0d970e3ae9163a Mon Sep 17 00:00:00 2001
From: Christian Baltzer <christian@baltzer.de>
Date: Sat, 13 Jul 2019 17:28:39 +0200
Subject: [PATCH] Password wird generiert

---
 src/main/java/com/ugsbo/Crypto/Payload.java | 41 +++++++++++++++------
 1 file changed, 29 insertions(+), 12 deletions(-)

diff --git a/src/main/java/com/ugsbo/Crypto/Payload.java b/src/main/java/com/ugsbo/Crypto/Payload.java
index ebc4fd2..80638a1 100644
--- a/src/main/java/com/ugsbo/Crypto/Payload.java
+++ b/src/main/java/com/ugsbo/Crypto/Payload.java
@@ -1,17 +1,32 @@
 package com.ugsbo.Crypto;
 
+import java.io.UnsupportedEncodingException;
+import java.security.GeneralSecurityException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
 import javax.crypto.*;
+import javax.crypto.spec.SecretKeySpec;
 
 public class Payload {
 
   String offen;
   String verschlüsselt;
-  String password;
+  SecretKeySpec password;
   
   public Payload() {
     offen = "";
     verschlüsselt = "";
-    password = "";
+    
+    try {
+      this.setPassword("");
+    } catch (UnsupportedEncodingException e) {
+      // TODO Auto-generated catch block
+      e.printStackTrace();
+    } catch (GeneralSecurityException e) {
+      // TODO Auto-generated catch block
+      e.printStackTrace();
+    }
   }
   
   
@@ -25,14 +40,6 @@ public class Payload {
     return verschlüsselt;
   }
 
-
-
-  public String getPassword() {
-    return password;
-  }
-
-
-
   public void setOffen(String offen) {
     this.offen = offen;
   }
@@ -45,8 +52,18 @@ public class Payload {
 
 
 
-  public void setPassword(String password) {
-    this.password = password;
+  public void setPassword(String password) throws GeneralSecurityException, UnsupportedEncodingException {
+    byte[] key = (password).getBytes("UTF-8");
+    
+   // aus dem Array einen Hash-Wert erzeugen mit MD5 oder SHA
+   MessageDigest sha = MessageDigest.getInstance("SHA-256");
+   key = sha.digest(key);
+   
+   // nur die ersten 128 bit nutzen
+   key = Arrays.copyOf(key, 16); 
+   
+   // der fertige Schluessel
+   this.password = new SecretKeySpec(key, "AES");
   }