Comments on: AES interoperability between .Net and iPhone

By: Mitesh Khatri

Mitesh Khatri — Fri, 23 Jul 2010 09:19:16 +0000

Thanks. very nice code. it helps very much…

By: Karloz

Karloz — Fri, 04 Jun 2010 00:45:45 +0000

YOU ARE THE MAN !!!!

saved me !

thanks everyone for fixing the Base64 Problem !!!!

By: Guna

Guna — Wed, 02 Jun 2010 01:52:16 +0000

Thanks for the code, it gives the clear idea for encrypting data on the iPhone and decrypting it using .Net.

By: jeet

jeet — Mon, 19 Apr 2010 14:52:09 +0000

I am not taking my words back… you guys are great, but I struck at ground I was testing both versions in and out.
I am encrypting a string in objective-c and also encrypting the same string in C# using AES and am seeing some strange issues. The first part of the result matches up to a certain point but then it is different. Why?

I am using a source string of “this is going to be test and fingers are crossed” Using a key of “1234567891123456″

The result from Objective C is 5U6TAlyma3GbR5UYqyk7d7mdTY1Jy9obUTwlOaL0/wn72s7IVZQPi1zydeonLSqP

The result from C# is
5U6TAlyma3GbR5UYqyk7d7mdTY1Jy9obUTwlOaL0/wn72s7IVZQPi1zydeonLSqPwifBaSjG51fj6y4S
j7cS7w==

you notice that initial portion of strings are same but then it starting differs.

I’ve not added/modified anything except for those string and key.
Please assist… I am in do/die situation

thanks
Jeet

By: jeet

jeet — Sun, 18 Apr 2010 10:48:50 +0000

by the way guys, I am looking for interoperability between .Net and iPhone for compression mechanism, currently I am trying gZip that available in both platforms, but luck is not my way,
strings which i compressed from both mechanism gives me different decompressed strings

many thanks
Jeet

By: jeet

jeet — Sun, 18 Apr 2010 06:37:20 +0000

you guys are chittah (jaguars) – kudos and many thanks!

By: Rpmobile

Rpmobile — Thu, 08 Apr 2010 18:19:14 +0000

Just discovered this post while searching for iphone->.NET crypto interop. Did the base 64 bug get addressed?

Thanks!

By: Denny Ferrassoli

Denny Ferrassoli — Wed, 03 Mar 2010 18:47:49 +0000

Thank you so much for finding this! I was trying to figure this out over a year ago and eventually had to move on.

By: Ben

Ben — Thu, 25 Feb 2010 08:30:45 +0000

Thanks for the code. It is very useful for me.
And I would also like to thanks bbb. Otherwise, I cannot still find a way to decrypt the base32 string.

By: bbb

bbb — Tue, 23 Feb 2010 22:03:05 +0000

Because this was so helpful…

There seems to be a bug in the base64 file. The line with inbuf[3] outbuf[4] should be inbuf[4] outbuf[3].

And you need to use the base64 stuff if you are working off the .NET example.. So something like

NSData * encdata = [NSData dataWithBase64DecodedString:the_encrypted64strfromweb];

NSData* decData = [crypto decrypt:encdata ….

————–

Oh, and just use a 16 character key right off the bat….

Thanks