Пример #1
0
  /**
   * Generate a new MWK
   *
   * @return Hex String of the new encrypted MWK ready for transmission to ValueLink
   */
  public byte[] generateMwk() {
    KeyGenerator keyGen = null;
    try {
      keyGen = KeyGenerator.getInstance("DES");
    } catch (NoSuchAlgorithmException e) {
      Debug.logError(e, module);
    }

    // generate the DES key 1
    SecretKey des1 = keyGen.generateKey();
    SecretKey des2 = keyGen.generateKey();

    if (des1 != null && des2 != null) {
      byte[] desByte1 = des1.getEncoded();
      byte[] desByte2 = des2.getEncoded();
      byte[] desByte3 = des1.getEncoded();

      // check for weak keys
      try {
        if (DESKeySpec.isWeak(des1.getEncoded(), 0) || DESKeySpec.isWeak(des2.getEncoded(), 0)) {
          return generateMwk();
        }
      } catch (Exception e) {
        Debug.logError(e, module);
      }

      byte[] des3 = copyBytes(desByte1, copyBytes(desByte2, desByte3, 0), 0);
      return generateMwk(des3);
    } else {
      Debug.logInfo("Null DES keys returned", module);
    }

    return null;
  }
    protected SecretKey engineGenerateSecret(KeySpec keySpec) throws InvalidKeySpecException {
      if (keySpec instanceof DESKeySpec) {
        DESKeySpec desKeySpec = (DESKeySpec) keySpec;
        return new SecretKeySpec(desKeySpec.getKey(), "DES");
      }

      return super.engineGenerateSecret(keySpec);
    }
Пример #3
0
  public static void encryptPassword(String password) throws Exception {
    KeyGenerator kg = KeyGenerator.getInstance("DES");
    kg.init(new SecureRandom());
    SecretKey key = kg.generateKey();
    SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
    Class spec = Class.forName("javax.crypto.spec.DESKeySpec");
    DESKeySpec ks = (DESKeySpec) skf.getKeySpec(key, spec);
    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("keyfile"));
    oos.writeObject(ks.getKey());

    Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
    c.init(Cipher.ENCRYPT_MODE, key);
    CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("ciphertext"), c);
    PrintWriter pw = new PrintWriter(new OutputStreamWriter(cos));
    pw.println(password);
    pw.close();
    oos.writeObject(c.getIV());
    oos.close();
  }