I have this piece of code that I use to encrypt/decrypt password that are
stored on a sqlite3 database. Up until now, I've been using my app on my
HTC Desire (Android 2.2.2) without any problems. Recently I got a Nexus 7
and to my surprise, my app didn't work. When trying to decrypt the
passwords, all the passwords come as "error", which is what I return when a
Exception occurs.
I decided to debug it on Eclipse, and I discovered that my code only fails
on Android 4.x. Works fine with 2.2 and 3.0. How is it possible that the
same code doesn't work? Has really javax.crypto changed on Android 4.x?
Thanks a lot in advance for any help.
The error from LogCat:
> 01-04 16:05:48.419: W/System.err(1452): javax.crypto.BadPaddingException:
> pad block corrupted
> 01-04 16:05:48.419: W/System.err(1452): at
> com.android.org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(BaseBlockCipher.java:709)
> 01-04 16:05:48.419: W/System.err(1452): at
> javax.crypto.Cipher.doFinal(Cipher.java:1111)
> 01-04 16:05:48.419: W/System.err(1452): at
> info.datavase.passkeep.Crypto.decrypt(Crypto.java:60)
> 01-04 16:05:48.419: W/System.err(1452): at
> info.datavase.passkeep.Crypto.decrypt(Crypto.java:28)
> 01-04 16:05:48.419: W/System.err(1452): at
> info.datavase.passkeep.ViewSite.unlockPassword(ViewSite.java:59)
> 01-04 16:05:48.439: W/System.err(1452): at
> java.lang.reflect.Method.invokeNative(Native Method)
> 01-04 16:05:48.439: W/System.err(1452): at
> java.lang.reflect.Method.invoke(Method.java:511)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.view.View$1.onClick(View.java:3592)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.view.View.performClick(View.java:4202)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.view.View$PerformClick.run(View.java:17340)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.os.Handler.handleCallback(Handler.java:725)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.os.Handler.dispatchMessage(Handler.java:92)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.os.Looper.loop(Looper.java:137)
> 01-04 16:05:48.439: W/System.err(1452): at
> android.app.ActivityThread.main(ActivityThread.java:5039)
> 01-04 16:05:48.439: W/System.err(1452): at
> java.lang.reflect.Method.invokeNative(Native Method)
> 01-04 16:05:48.439: W/System.err(1452): at
> java.lang.reflect.Method.invoke(Method.java:511)
> 01-04 16:05:48.449: W/System.err(1452): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
> 01-04 16:05:48.449: W/System.err(1452): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
> 01-04 16:05:48.449: W/System.err(1452): at
> dalvik.system.NativeStart.main(Native Method)
My class:
package info.datavase.passkeep;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;
public class Crypto {
public static String encrypt(String seed, String cleartext) {
try {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] result = encrypt(rawKey, cleartext.getBytes());
return Base64.encodeToString(result, Base64.NO_WRAP);
}
catch(Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "error";
}
public static String decrypt(String seed, String encrypted) {
try {
byte[] rawKey = getRawKey(seed.getBytes());
byte[] enc = Base64.decode(encrypted, Base64.NO_WRAP);
byte[] result = decrypt(rawKey, enc);
return new String(result);
}
catch(Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "error";
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(128, sr);
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws
Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws
Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
}
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