svenkapudija svenkapudija - 3 months ago 63
Android Question

Fast and simple String encrypt/decrypt in JAVA

I need fast and simple way to encrypt/decrypt a "lot" of String data.
I tried jasypt but it crashes on my Android phone. I have about 2000 records (strings).

BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
textEncryptor.setPassword("password");
String myEncryptedText = textEncryptor.encrypt(input);


Is there some other way? I don't need extremely high security, it needs to be fast!

Answer

Java - encrypt / decrypt user name and password from a configuration file

Code from above link

DESKeySpec keySpec = new DESKeySpec("Your secret Key phrase".getBytes("UTF8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(keySpec);
sun.misc.BASE64Encoder base64encoder = new BASE64Encoder();
sun.misc.BASE64Decoder base64decoder = new BASE64Decoder();
.........

// ENCODE plainTextPassword String
byte[] cleartext = plainTextPassword.getBytes("UTF8");      

Cipher cipher = Cipher.getInstance("DES"); // cipher is not thread safe
cipher.init(Cipher.ENCRYPT_MODE, key);
String encryptedPwd = base64encoder.encode(cipher.doFinal(cleartext));
// now you can store it 
......

// DECODE encryptedPwd String
byte[] encrypedPwdBytes = base64decoder.decodeBuffer(encryptedPwd);

Cipher cipher = Cipher.getInstance("DES");// cipher is not thread safe
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] plainTextPwdBytes = (cipher.doFinal(encrypedPwdBytes));