Hi,
On Jun 2, 2011, at 10:02 AM, Damian Rusinek wrote:
> Unfortunately encrypting the ciper again does not decrypt it.
In the sample code, try setting the plain text to
uint8_t aes_plaintext[16] = {
0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,
0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a,
};
and check what the encrypted text is. Make sure the rest of the sample code
is unchanged!
> To
> decrypt, you need to provide generated keys in inverted order. That's
> what I want to achieve.
I am not sure what you mean by that. In general, the CC2420 needs inversion
of the key-bytes, because the key is read like that (i.e., backwards) into RAM.
But this affects encryption as well as decryption and is already done by that
library. You should not need to invert anything.
Best,
Jakob
> 2011/6/2 Jakob Bieling <[email protected]>:
>> try "encryting" the cipher text again. The CC2420 AES works in CTR mode,
>> meaning encryption and decryption are the same operation.
>>
>> Moreover, if you send your packets anyway, you can use the built-in
>> functionality of the CC2420 chip to encrypt all outgoing packets on the fly.
>> It will also decrypt incoming packets automatically. TinyOS already allows
>> for this, simply Google for "tinyos cc2420 security tutorial". Note that the
>> actual wiki seems to be down, but you use the Google cache. That worked for
>> me.
>>
>> On Jun 2, 2011, at 9:07 AM, Damian Rusinek wrote:
>>
>>> Hello.
>>> I'm using 'The Standalone AES Encryption of CC2420' which is described
>>> here:
>>> http://cis.sjtu.edu.cn/index.php/The_Standalone_AES_Encryption_of_CC2420_(TinyOS_2.10_and_MICAz)
>>>
>>> I encrypt the payload of my packet before sending.
>>> The question is how can I decrypt it?
>>> Does anybody use this library?
--
net.cs.bonn.edu/bieling
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