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 tried to cut down stack use to a minimum (1 push/pop per round) and
optimize the code as much as possible. 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.
Benchmarks:
-------------------
Performance on a dm-crypt volume increased about 30% while reading. With
256bit keylength it even outperformed the 128bit aes assembler code.
http://homepages.tu-darmstadt.de/~fritschi/twofish/output_20060417_185029_x86.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-i586-asm-2.6.17.diff
Please have a look, try, improve and criticise.
Regards,
Joachim
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