Subtrees hinzugefügt

Quellcodes/iud_key_rsachat/Nachricht.java

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+/**
+  *
+  * description
+  *
+  * @version 1.1 from 30.01.2020
+   * Änderungen: Hash-Funktion verbessert, damit ähnliche Texte nicht so ähnliche Hashes bekommen
+  * @author 
+  */
+  
+  import java.util.ArrayList;
+  import java.security.MessageDigest;
+  import java.nio.charset.StandardCharsets;
+
+public class Nachricht {
+  
+  // Anfang Attribute
+  private byte[] inhalt;
+  private String absender;
+  private String empfaenger;
+  private ArrayList<Key> keys;
+  private ArrayList<Key> hashKeys;
+  private byte[] hashCode;
+  private long time;
+  private boolean stopped;
+  private boolean sended;
+  // Ende Attribute
+  
+  public Nachricht(String absender, String empfaenger, String inhalt) {
+    setInhalt(inhalt);
+    this.absender = absender;
+    this.empfaenger = empfaenger;
+    this.keys = new ArrayList<Key>();
+    this.hashKeys = new ArrayList<Key>();
+    this.hashCode = ("").getBytes() ;
+    this.time = System.currentTimeMillis();
+    this.stopped = false;
+    this.sended = false;
+  }
+  
+  public Nachricht(String absender, String empfaenger, byte[] inhalt, byte[] hashCode) {
+    this.inhalt = inhalt;
+    this.absender = absender;
+    this.empfaenger = empfaenger;
+    this.keys = new ArrayList<Key>();
+    this.hashKeys = new ArrayList<Key>();
+    this.hashCode = hashCode;
+    this.time = System.currentTimeMillis();
+    this.stopped = false;
+    this.sended = false;
+    
+  }
+  
+  public Nachricht(String absender, String empfaenger, String inhalt, ArrayList<Key> keys, ArrayList<Key> hashKeys) {
+    setInhalt(inhalt);
+    this.absender = absender;
+    this.empfaenger = empfaenger;
+    this.keys = (ArrayList<Key>)keys.clone();
+    this.hashKeys = (ArrayList<Key>) hashKeys.clone();
+    this.hashCode = ("").getBytes() ;
+    this.time = System.currentTimeMillis();
+    this.stopped = false;
+    this.sended = false;
+    
+  }
+  
+  public Nachricht(String absender, String empfaenger, byte[] inhalt, byte[] hashCode, ArrayList<Key> keys, ArrayList<Key> hashKeys) {
+    this.inhalt = inhalt;
+    this.absender = absender;
+    this.empfaenger = empfaenger;
+    this.keys = (ArrayList<Key>)keys.clone();
+    this.hashKeys = (ArrayList<Key>) hashKeys.clone();
+    this.hashCode = hashCode;
+    this.time = System.currentTimeMillis();
+    this.stopped = false;
+    this.sended = false;
+  }
+  
+  // Anfang Methoden
+  public String getInhaltString() {
+    return new String(inhalt);
+  }
+  
+  public byte[] getInhalt() {
+    return inhalt;
+  }
+  
+  
+  public void setInhalt(String inhalt) {
+    this.inhalt = inhalt.getBytes();
+  }
+  
+  public void setInhalt(byte[] inhalt) {
+    this.inhalt = inhalt;
+  }
+  
+  public String getAbsender() {
+    return absender;
+  }
+  
+  public void setAbsender(String absender) {
+    this.absender = absender;
+  }
+    
+  public String getEmpfaenger() {
+    return empfaenger;
+  }
+    
+  public void setEmpfaenger(String empfaenger) {
+    this.empfaenger = empfaenger;
+  }
+    
+  public Nachricht copy() {
+    Nachricht n = new Nachricht(absender, "", inhalt, hashCode, keys, hashKeys);
+    return n;
+  }
+  public void addKey(Key k) {
+    
+    keys.add(k);
+  }
+  
+  public ArrayList<Key> getKeys() {
+    
+    return keys;
+  }
+  
+  public void addHashKey(Key k) {
+    
+    hashKeys.add(k);
+  }
+  
+  public ArrayList<Key> getHashKeys() {
+    
+    return hashKeys;
+  }
+  
+  public void generateHash() {
+    try{
+      MessageDigest digest = MessageDigest.getInstance("SHA-256");
+      hashCode = Base64.encode(digest.digest(getInhaltString().getBytes(StandardCharsets.UTF_8))).substring(0,10).getBytes();
+      
+    } catch(Exception e) {
+      System.out.println(e);
+      hashCode = new byte[0];
+    }
+
+  }
+  
+  public byte[] getHashCode() {
+    return hashCode;
+  }
+  
+  public void setHashCode(byte[] hashCode) {
+    this.hashCode = hashCode;
+  }
+  
+  public int getRestzeit() {
+    if (sended || stopped) {
+      return 0;
+    } // end of if
+    return 10 - (int) ((System.currentTimeMillis()-this.time)/1000);
+  }   
+  
+  
+  
+  public boolean getSended() {
+    return sended;
+  }
+  
+  public void setSended(boolean s) {
+    sended = s;
+  }
+     
+  
+  public boolean getStopped() {
+    return stopped;
+  }
+  
+  public void setStopped(boolean s) {
+    stopped = s;
+  }
+  // Ende Methoden
+    
+}