|
Message
From: Hemanth<hemanths@d...>
Date: Mon Oct 23 08:15:29 CEST 2006
Subject: [oc] AES128 Question
Hmm..,
I got where you are pointing at, I think I missed answering this in my
previous post. You are right the RTL does'nt ouput the inverse key. I
think my assumption was that the RTL need'nt take the burden of it. So
looks like you have to record the inverse key by looking at the waveform
or better still adding a piece of code to the TB to spy on the interior
signals of the key expander module at the end of its encryption/decryption
phase or even better you could have an excel spread sheet or some program
do that.
Hope this answers your doubts,
Hemanth
> Yes I understand Hemanth but the inverse key is not an output of the
> AES core, I dont know where to access it. Everything you said makes
> perfect sense so if I could figure out how to access the inverse key I'll
> be fine. Thanks!
>
> ----- Original Message -----
> From: Hemanth<hemanths@d...>
> To:
> Date: Wed Oct 18 13:37:36 CEST 2006
> Subject: [oc] AES128 Question
>
>> Hi Jonathan,
>> I am sorry for not being able to reply earlier, I have been
>> travelling a
>> lot and hardly have checked my mails in between. Hmm.. that was a
>> long
>> time back and dont remember exactly but if my memory is correct the
>> inverse key is the key that is output after an encryption is
>> completed. If
>> you observe, both data and key undergo a series of transformation
>> and at
>> the end there is both a garbled key and encrypted data coming out.
>> This
>> key is taken as the inverse key for decryption. Infact I have used
>> one set
>> of key pairs as default in my test bench. This information is also
>> explained in the FIPS document.
>> Hope this helps,
>> Hemanth
>> > While using the AES128 core (aes_crypto_core) I have come
>> across a
>> > problem; after encrypting data with a key and receiving an
>> output, how
>> > do I know what the inverse key is in order to decrypt the
>> output? I had
>> > an example from the fips document about AES so I was able to
>> test
>> > given their key and output key, and was successful in doing
>> so.
>> > However, making up a key wont work for me as I have no idea
>> what the
>> > inverse key is. Clearing this issue up would really help me
>> out. Thanks.
>> > _______________________________________________
>> > http://www.opencores.org/mailman/listinfo/cores
>> >
>> -----------------------------------------
>> Stay ahead of the information curve.
>> Receive EDA news and jobs on your desktop daily.
>> Subscribe today to the EDA CafeNews newsletter.
>> [ http://www10.edacafe.com/nl/newsletter_subscribe.php ]
>> It's informative and essential.
>> This message was sent to you from a machine at 128.88.255.123
>>
>>
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/cores
>
-----------------------------------------
Stay ahead of the information curve.
Receive EDA news and jobs on your desktop daily.
Subscribe today to the EDA CafeNews newsletter.
[ http://www10.edacafe.com/nl/newsletter_subscribe.php ]
It's informative and essential.
This message was sent to you from a machine at 128.88.255.35
|
 |
Browse
