app/src/main/java/de/dhbwloe/campusapp/Tools.java

   1 package de.dhbwloe.campusapp;
   2
   3 import android.view.View;
   4 import android.view.ViewGroup;
   5 import android.widget.AdapterView;
   6
   7 import java.security.MessageDigest;
   8 import java.security.NoSuchAlgorithmException;
   9
  10 import javax.crypto.Cipher;
  11 import javax.crypto.spec.SecretKeySpec;
  12
  13 /**
  14  * Created by pk910 on 25.01.2016.
  15  */
  16 public class Tools {
  17
  18     public static final String md5(final String s) {
  19         final String MD5 = "MD5";
  20         try {
  21             // Create MD5 Hash
  22             MessageDigest digest = java.security.MessageDigest.getInstance(MD5);
  23             digest.update(s.getBytes());
  24             byte messageDigest[] = digest.digest();
  25
  26             // Create Hex String
  27             StringBuilder hexString = new StringBuilder();
  28             for (byte aMessageDigest : messageDigest) {
  29                 String h = Integer.toHexString(0xFF & aMessageDigest);
  30                 while (h.length() < 2)
  31                     h = "0" + h;
  32                 hexString.append(h);
  33             }
  34             return hexString.toString();
  35
  36         } catch (NoSuchAlgorithmException e) {
  37             e.printStackTrace();
  38         }
  39         return "";
  40     }
  41
  42     public static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
  43         SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
  44         Cipher cipher = Cipher.getInstance("AES");
  45         cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
  46         byte[] encrypted = cipher.doFinal(clear);
  47         return encrypted;
  48     }
  49
  50     public static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
  51         SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
  52         Cipher cipher = Cipher.getInstance("AES");
  53         cipher.init(Cipher.DECRYPT_MODE, skeySpec);
  54         byte[] decrypted = cipher.doFinal(encrypted);
  55         return decrypted;
  56     }
  57
  58     public static void removeAllChildViews(ViewGroup viewGroup) {
  59         for (int i = 0; i < viewGroup.getChildCount(); i++) {
  60             View child = viewGroup.getChildAt(i);
  61             if (child instanceof ViewGroup) {
  62                 if (child instanceof AdapterView) {
  63                     viewGroup.removeView(child);
  64                     return;
  65                 }
  66                 removeAllChildViews(((ViewGroup) child));
  67             } else {
  68                 viewGroup.removeView(child);
  69             }
  70         }
  71     }
  72
  73 }