XTS performance

dm-crypt Yaron Sheffer 1 participant 1 message Apr 30, 2012

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Yaron Sheffer

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2012-04-30 12:06 UTC #0 lore raw

Hi,

Looking back at the archives, it appears that AES-XTS in dm-crypt runs at half the speed of AES-CBC-ESSIV: http://www.saout.de/pipermail/dm-crypt/2010-November/001348.html. Milan explained it at the time by XTS doing 2 AES operations for each plaintext block. But my understanding of XTS is that it is similar to ESSIV: 1 AES op per 16-byte block, plus 1 op for the sector.

- Did I misread the definition of XTS, and it's really 2 AES ops per 16-byte block?

- Does anybody have more recent performance comparisons, confirming (or not) the performance difference?

Thanks,

Yaron