Hello,
First of all it looks like the function your call to
AES_set_encrypt_key is working. I'm guessing that you send in some array
representing the key, then inside the dll you are calculating a new key based
on the value of the first (based on AES). I have had no problems sending
or receiving the data from this call. I'm guessing that you want to first
compute a key value, then call the AES_encrypt function with a byte[] and the
key to encrypt a string of data. The error is occurring inside of the dll,
and my guess is that you are improperly accessing memory from an array.
If I directly connect the output key value coming from the AES set encrypt key
function to the input (of the same datatype) of the encrypt function I can see
the crash you are talking about. I notice that you do not have any
elements in your "out" array (the array being fed to the library
node) which could be causing problems if you are trying to access or add those
elements in the dll. If you want to return an array of data from a dll to
use in LabVIEW you will either need to pass in an appropriately sized array
(almost certainly something larger than 0 elements), or you will need to use
CIN functions found prototyped in extcode.h. I believe you are attempting
to go with the first (and easiest) strategy. First double check that you
are not accessing data that is no longer valid -- make sure that you use the
data that you pass directly into the dll and perform no allocations in the dll
that might be returned to LabVIEW. Next you will want to make sure that
your structs are being passed properly. The links below discuss some of
those issues.
http://digital.ni.com/manuals.nsf/websearch/8D930295FFBF9F7686256D2C00624728
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3F05B56A4E034080020E74861&p_...
http://digital.ni.com/public.nsf/websearch/3FF4805467498BA986256CB80082FED8?OpenDocument
http://digital.ni.com/public.nsf/websearch/F7E5C9169D09E98586256AF300717B33?OpenDocument
http://digital.ni.com/public.nsf/websearch/5F94E0FD2BD4732786256547007D8EBB?OpenDocument
http://forums.ni.com/ni/board/message?board.id=170&message.id=22134
Hopefully this helps.
Incidentally if you aren’t specifically dedicated to the AES
cryptosystem there are easy to use alternatives! One is ready to use and can be found here: http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=CC84926E4DB6109EE034080020E74861&p_....
Thanks for posting, and good luck!
Travis M
LabVIEW R&D
National Instruments
