iud_key_imp10/Quellcodes/iud_key_rsachat/Nachricht.java

/**
  *
  * 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
    
}