src/cx/fbn/nevernote/utilities/AESEncrypter.java

   1 /*\r
   2  * This file is part of NixNote \r
   3  * Copyright 2009 Randy Baumgarte\r
   4  * \r
   5  * This file may be licensed under the terms of of the\r
   6  * GNU General Public License Version 2 (the ``GPL'').\r
   7  *\r
   8  * Software distributed under the License is distributed\r
   9  * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either\r
  10  * express or implied. See the GPL for the specific language\r
  11  * governing rights and limitations.\r
  12  *\r
  13  * You should have received a copy of the GPL along with this\r
  14  * program. If not, go to http://www.gnu.org/licenses/gpl.html\r
  15  * or write to the Free Software Foundation, Inc.,\r
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.\r
  17  *\r
  18 */\r
  19 package cx.fbn.nevernote.utilities;\r
  20 \r
  21 //RSA - Rivest, Shamir, & Adleman\r
  22 \r
  23 import java.io.InputStream;\r
  24 import java.io.OutputStream;\r
  25 import java.security.InvalidAlgorithmParameterException;\r
  26 import java.security.InvalidKeyException;\r
  27 import java.security.spec.AlgorithmParameterSpec;\r
  28 \r
  29 import javax.crypto.Cipher;\r
  30 import javax.crypto.CipherInputStream;\r
  31 import javax.crypto.CipherOutputStream;\r
  32 import javax.crypto.spec.IvParameterSpec;\r
  33 import javax.crypto.spec.SecretKeySpec;\r
  34  \r
  35 public class AESEncrypter\r
  36 {\r
  37         private Cipher cipher;\r
  38         private String string;\r
  39         private final SecretKeySpec skeySpec;\r
  40         private final AlgorithmParameterSpec paramSpec;\r
  41         \r
  42         public AESEncrypter()\r
  43         {\r
  44                 String key = "x331aq5wDQ8xO81v";\r
  45                 skeySpec = new SecretKeySpec(key.getBytes(), "AES");\r
  46                 string = new String("");\r
  47                 \r
  48                 // Create an 8-byte initialization vector\r
  49                 byte[] iv = new byte[]\r
  50                 {\r
  51                         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f\r
  52                 };\r
  53                 \r
  54                 paramSpec = new IvParameterSpec(iv);\r
  55                 try\r
  56                 {\r
  57                         cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");\r
  58                 }\r
  59                 catch (Exception e)\r
  60                 {\r
  61                         e.printStackTrace();\r
  62                 }\r
  63         }\r
  64         public void setString(String s) {\r
  65                 string = s;\r
  66         }\r
  67         public String getString() {\r
  68                 return string;\r
  69         }\r
  70         \r
  71         public void encrypt(OutputStream out)\r
  72         {\r
  73                 // CBC requires an initialization vector\r
  74                 try {\r
  75                         cipher.init(Cipher.ENCRYPT_MODE, skeySpec, paramSpec);\r
  76                         out = new CipherOutputStream(out, cipher);\r
  77 \r
  78 //                      String u = new String(userid +" " +password);\r
  79                         StringBuffer u = new StringBuffer(1024);\r
  80                         u.append(string);\r
  81                         for (int i=u.length(); i<128; i++)\r
  82                                 u.append('\0');\r
  83 \r
  84                         out.write(u.toString().getBytes());\r
  85                         out.close();\r
  86                 }\r
  87                 catch (java.io.IOException e)\r
  88                 {\r
  89                         System.out.println("Encrypt i/o exception");\r
  90                 } catch (InvalidKeyException e1) {\r
  91                         e1.printStackTrace();\r
  92                 } catch (InvalidAlgorithmParameterException e1) {\r
  93                         e1.printStackTrace();\r
  94                 }\r
  95         }\r
  96         \r
  97         public void decrypt(InputStream in)\r
  98         {\r
  99                 byte[] buf = new byte[1024];\r
 100                 // CBC requires an initialization vector\r
 101                 try {\r
 102                         cipher.init(Cipher.DECRYPT_MODE, skeySpec, paramSpec);\r
 103                         // Bytes read from in will be decrypted\r
 104                         in = new CipherInputStream(in, cipher);\r
 105                         if (in.read(buf) >= 0)\r
 106                         {\r
 107                                 string = new String(buf);       \r
 108                         }\r
 109                         in.close();\r
 110                 } catch (java.io.IOException e) {\r
 111                         return;\r
 112                 } catch (InvalidKeyException e1) {\r
 113                         return; \r
 114                 } catch (InvalidAlgorithmParameterException e1) {\r
 115                         return;\r
 116                 }\r
 117         }\r
 118 }\r