optimized crypto A.T.S

[0x401000]

Seeking optimized by the size of the implementation of AES256, Twofish and Serpent. The total amount of code, tables, and expanded key has to be minimal. There is an acute shortage of memory and each kilobyte is very expensive. Thanks in advance!

[dsouza123]

Some of the new i5 Intel CPUs have 6 new AES instructions AES-NI using xmm registers.
AESENC, AESENCLAST, AESDEC, AESDELAST, AESIMC, AESKEYGENASSIST.

There is an informitive pdf from Intel using Intel syntax assembly code.

aes-instructions-set_wp.pdf


Also a newer one using mostly C with intrinsics and ATT syntax assembly,
also has some performance graphs.

AES_WP_Rev_03_Final_2010_01_26.pdf

Need the following URL to get the newer version.
http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set/

[0x401000]

Thanks, the program will be performed on older processors also. Information is very interesting. thanks!  :U

[Astro]

Hi,

What OS are you running?

Best regards,
Robin.

[theunknownguy]

On serpent it would be some kind of hard, but i think you can optimise the SBOXs and the KeyRounds.

But it depends on how you done them, if you already compress them i think there isnt much to do...

[donkey]

Seeking optimized by the size of the implementation of AES256, Twofish and Serpent. The total amount of code, tables, and expanded key has to be minimal. There is an acute shortage of memory and each kilobyte is very expensive. Thanks in advance!

Attached is an implementation of AES (rjindael) for GoAsm, it has switches for static or dynamic tables that will reduce the resulting size, just assemble it with:

#DEFINE AES_TABLES AES_DYNAMIC
#DEFINE AES_KEY_SIZE 256

which I think is the default anyway but you might check to be sure.

Edgar

[0x401000]

Thank you!  :U

[jj2007]

Or, rather the time needed to crack the key has been dramatically reduced (from 10 Mio years to only 3 Mio, assuming a Billion puters are working in parallel on the problem).

https://research.microsoft.com/en-us/projects/cryptanalysis/aes.aspx
:U