Rfc2898DeriveBytes.GetBytes raised an exception under Android

Hello,

I need to encrypt some data for my game (before storing it).
Everything is ok in the editor.
But once it run on my test device it raised an exception.

It seems that this code is not ok

var password = new Rfc2898DeriveBytes(passPhrase, saltStringBytes, DerivationIterations);
var keyBytes = password.GetBytes(Keysize / 8);

Here is my logs

Exception catched GetBytes: Object reference not set to an instance of an object
04-06 23:48:54.560 28450 28495 E Unity : at System.Security.Cryptography.HMAC.Initialize () [0x00000] in <filename unknown>:0
04-06 23:48:54.560 28450 28495 E Unity : at System.Security.Cryptography.HMAC.HashCore (System.Byte[] rgb, Int32 ib, Int32 cb) [0x00000] in <filename unknown>:0
04-06 23:48:54.560 28450 28495 E Unity : at System.Security.Cryptography.HashAlgorithm.ComputeHash (System.Byte[] buffer, Int32 offset, Int32 count) [0x00000] in <filename unknown>:0
04-06 23:48:54.560 28450 28495 E Unity : at System.Security.Cryptography.HashAlgorithm.ComputeHash (System.Byte[] buffer) [0x00000] in <filename unknown>:0
04-06 23:48:54.560 28450 28495 E Unity : at System.Security.Cryptography.Rfc2898DeriveBytes.F (System.Byte[] s, Int32 c, Int32 i) [0x00000] in <filename unknown>:0
04-06 23:48:54.560 28450 28495 E Unity : at System.Security.Cryptography.Rfc2898DeriveBytes.GetBytes (Int32 cb) [0x00000] in <filename unknown>:0
04-06 23:48:54.560 28450 28495 E Unity : at StringCipher.Encrypt (System.String plainText, System.String passPhrase) [0x000b9] in /Users/nicolas/dev/git/project/Assets/Scripts/Managers/PlayerGameData.cs:326

If found something quite similar here
http://answers.unity3d.com/questions/991254/aes-encryption-in-ios-nullreferenceexception.html
but it seems to be related to iOS only ... which is not my case (yet).

@JoshPeterson, as you answered the question about AES under iOS perhaps you have an idea ?

Do someone else as any idea ?

I am using Unity3D 5.2.4f1
And my test device is a nexus 5 with android 6.0.1

Thanks

 

ok the problem was due to the stripping of the player
if a disable it everything is ok
thanks

 

In fact I have not solved this problem.
I try to use link.xml but I continue to have the exception raised.
Cannot find what to add to link.xml to solve the problem.
Or the problem is not directly linked to link.xml file but perhaps to the code it self.

If I look for this king on problem usign google, it seems I am not the only one to encouter problems when using encryption with stripped player. But I am the only one to use "Rfc2898DeriveBytes". Perhaps I will think to change to encryption code.

 

in fact I found the solution ... a little problem in the link.xml file ...

 

I am also facing the same issue. Can you please share the fix?

 

Kindly share what the issue is

 

here is the link.xml is use

Code (CSharp):

1. <linker>
2.     <assembly fullname="mscorlib">
3.         <namespace fullname="System.Security.Cryptography" preserve="all"/>
4.     </assembly>
5. </linker>