Encryption, Decryption
/**
* Encrypt local and inherited fields with the password.
*/
public void encrypt(String password) throws Exception {
if (password == null || password.length() == 0)
return;
// generate the key with password
KeyGenerator generator = KeyGenerator.getInstance("DES");
generator.init(new SecureRandom(password.getBytes()));
Key key = generator.generateKey();
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
// do encryption
// this is for padding
BASE64Encoder encoder = new BASE64Encoder();
program = encoder.encode(cipher.doFinal(program.getBytes()));
}
/**
* Decrypt the local and inherited feilds with the password.
*/
public void decrypt(String password) throws Exception {
if (password == null || password.length() == 0)
return;
// generate the key with password
KeyGenerator generator = KeyGenerator.getInstance("DES");
generator.init(new SecureRandom(password.getBytes()));
Key key = generator.generateKey();
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
// do encryption
// this is for padding
BASE64Decoder decoder = newBASE64Decoder();
program = new String(cipher.doFinal(decoder.decodeBuffer(program)));
}
