crypto:aes problem

Nils Müllner nils.muellner@REDACTED
Tue Mar 7 18:25:55 CET 2006

there seems to be a problem with the server. correct url:

> hi,
> i wrote a little "benchmark" in erlang, using the crypto:aes_cbc. but 
> it happens, that crypto:aes_cbc produces 2 different results with the 
> same input and the benchmark fails. i wanted to compare the power of 
> distributed computing against one single pc. even the power of 
> multi-cpu-systems could been measured by starting multiple 
> client-nodes. can somebody help please ;-)
> the code is available at
> for use please take the following steps:
> 1. ensure that your erlang dist supports aes and you have the 
> .erlang.cookie set
> 2. edit the values "talona" in the code to the name of your machine, 
> talona was mine... (should be 4 times)
> 3. start 3 consoles, go to the dir containing the db3.erl
> 4. run
> erl -sname server on the first,
> erl -sname keyserver on 2nd and
> erl -sname client on 3rd
> 5. run c(db3). on all of them
> 6. on server@REDACTED run
> db3:start_server(). on client@REDACTED run
> db3:start_client(). and on keyserver@REDACTED run
> db3:start_keyserver().
> 7. finally, to start the whole mess type db3:start().
> the used key is set to
> Key = 
> <<16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#00,16#0F,16#0F>>, 
> so the server is supposed to stop after 16*256 steps. the output 
> proofs that the function gets the right values (if you interrupt by 
> pressing ctrl+c while the client tests the key), but crypto:aes is 
> producing the wrong result. i have looked over the program the last 2 
> days and i cant find a mistake in my program. can anyone test this and 
> tell me wether im wrong or there is a bug?
> nils
> p.s.
> this is not intended to break any cipher!! its just for benchmarking 
> and comparing systems! i know it costs a lot of computing time to 
> generate the whole output. but the output is just for debugging. the 
> final version will just consist of a result output.

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