Implementation:
-----------------------
This code is based on the current linux twofish cipher c implementation. Only
the decrypt/encrypt routines were replaced by optimized assembler code. The
in-kernel code by Matthew Skala takes care of the keysetup and precomputation
of the sbox lookup tables.
I have eliminated stack use, tried to optimize the code as much as possible
and limit code size. The patch is similar to the existing aes assembler
implementation.
Testing:
-----------
The code passed the kernel test module and passed automated tests on a
dm-crypt volume reading/writing large files with alternating modules ( c /
assembler ) and comparing results. It is also running on my workstation for
over a week now.
Benchmarks:
-------------------
Performance on a dm-crypt volume increased about 47% while reading. With
256bit keylength its pretty close to the speed of the aes assembler version.
http://homepages.tu-darmstadt.de/~fritschi/twofish/output_20060426_175710_x86_64.html
The write performance in this benchmark was limited by the harddrive and not
the algorithm / system speed. Any suggestions how to benchmark the overall
speed accurately are welcome.
Patch:
----------
http://homepages.tu-darmstadt.de/~fritschi/twofish/twofish-x86_64-asm-2.6.17.diff
Please have a look, try, improve and criticise.
Regards,
Joachim
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