Bug 53784 - RijndaelManaged.CreateEncryptor returns a ill-configured Crimson.CommonCrypto.FastCryptorTransform
Summary: RijndaelManaged.CreateEncryptor returns a ill-configured Crimson.CommonCrypto...
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: master
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2017-03-22 13:04 UTC by Rodrigo Guimaraes
Modified: 2017-03-24 12:04 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Rodrigo Guimaraes 2017-03-22 13:04:48 UTC
I have a shared MyCrypto class that is being used for a Xamarin.Droid and a Xamarin.iOS project. It basically goes like this:

public static RijndaelManaged myRijndael = new RijndaelManaged();
myRijndael.Key = aesKey; //aesKey is received by the constructor
myRijndael.BlockSize = 128;
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.None;
And then on the beginning of the Encrypt function I do:

ICryptoTransform encryptor = myRijndael.CreateEncryptor(myRijndael.Key, myRijndael.IV);

On Android, myRijndael.CreateEncryptor returns a System.Security.Cryptography.RijndaelManagedTransform that works perfectly and is correctly configured. On iOS, though, a Crimson.CommonCrypto.FastCryptoTransform object is returned, and it seems like this object ignores some of my configurations, such as the PaddingMode.
Comment 1 Manuel de la Peña [MSFT] 2017-03-23 16:34:27 UTC

Could you please provide a test case that shows the bug in the returned class? Also, could you please provide the details of your environment?

The easiest way to get exact version information is to use the "Xamarin Studio" menu, "About Xamarin Studio" item, "Show Details" button and copy/paste the version informations (you can use the "Copy Information" button).
Comment 2 Rodrigo Guimaraes 2017-03-24 12:04:04 UTC
Sorry, a non-related bug was causing the initialization function not to be called. The bug is resolved.