src/java/iotcloud/Table.java

   1 package iotcloud;
   2 import java.util.HashMap;
   3 import javax.crypto.spec.*;
   4 import javax.crypto.*;
   5
   6 public class Table {
   7         int numslots;
   8         HashMap table=new HashMap();
   9         CloudComm cloud;
  10         private Cipher encryptCipher;
  11         private Cipher decryptCipher;
  12         private Mac hmac;
  13
  14         public Table(String baseurl, String password) {
  15                 cloud=new CloudComm(baseurl);
  16                 initCiphers(password);
  17         }
  18
  19         private void initCiphers(String password) {
  20                 try {
  21                         SecretKeySpec secret=getKey(password);
  22                         encryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
  23                         encryptCipher.init(Cipher.ENCRYPT_MODE, secret);
  24                         decryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
  25                         decryptCipher.init(Cipher.DECRYPT_MODE, secret);
  26                         hmac = Mac.getInstance("HmacSHA256");
  27                         hmac.init(secret);
  28                 } catch (Exception e) {
  29                         throw new Error("Failed To Initialize Ciphers");
  30                 }
  31         }
  32
  33         private SecretKeySpec getKey(String password) {
  34                 try {
  35                         PBEKeySpec keyspec = new PBEKeySpec(password.toCharArray());
  36                         SecretKey key = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256").generateSecret(keyspec);
  37                         SecretKeySpec secret = new SecretKeySpec(key.getEncoded(), "AES");
  38                         return secret;
  39                 } catch (Exception e) {
  40                         throw new Error("Failed generating key.");
  41                 }
  42         }
  43 }