[Cryptech Tech] trng ready for play

[Joachim Strömbergson]

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Aloha!

Joachim Strömbergson wrote:
> My core does 1.25 cycles/byte. The clock frequency is way lower than
> a modern, desktop/server CPU and can be beaten core for core. But
> that is not the point.

And that value was off by four. The correct value is 20 cycles for 64
bytes, or 0.3 cycles/byte. With a 50 MHz clock we can generate random
numbers at about 1.6 Gbps speed with one ChaCha core.

The best benchmark result for ChaCha20 as given by the extensive
measurements by DJB et al is 1.07 cycles/byte on x86:

http://bench.cr.yp.to/results-stream.html

Looking further down the list, ARM gets something between 8 and 16
cycles/byte. This means that we are between 27 and 50+ times faster
cycle for cycle than an ARM core.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
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 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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