Messages in this thread | | | From | Joachim Fritschi <> | Subject | [RFC][PATCH 2/2] Twofish cipher x86_64-asm optimized | Date | Sun, 7 May 2006 11:57:03 +0200 |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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