Re: [PATCH] crypto: CTR DRBG - in-place cipher operation

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On Fri, Jul 20, 2018 at 07:42:01PM +0200, Stephan Müller wrote:
> The cipher implementations of the kernel crypto API favor in-place
> cipher operations. Thus, switch the CTR cipher operation in the DRBG to
> perform in-place operations. This is implemented by using the output
> buffer as input buffer and zeroizing it before the cipher operation to
> implement a CTR encryption of a NULL buffer.
> 
> The speed improvement is quite visibile with the following comparison
> using the LRNG implementation.
> 
> Without the patch set:
> 
>       16 bytes|           12.267661 MB/s|    61338304 bytes |  5000000213 ns
>       32 bytes|           23.603770 MB/s|   118018848 bytes |  5000000073 ns
>       64 bytes|           46.732262 MB/s|   233661312 bytes |  5000000241 ns
>      128 bytes|           90.038042 MB/s|   450190208 bytes |  5000000244 ns
>      256 bytes|          160.399616 MB/s|   801998080 bytes |  5000000393 ns
>      512 bytes|          259.878400 MB/s|  1299392000 bytes |  5000001675 ns
>     1024 bytes|          386.050662 MB/s|  1930253312 bytes |  5000001661 ns
>     2048 bytes|          493.641728 MB/s|  2468208640 bytes |  5000001598 ns
>     4096 bytes|          581.835981 MB/s|  2909179904 bytes |  5000003426 ns
> 
> With the patch set:
> 
>       16 bytes |         17.051142 MB/s |     85255712 bytes |  5000000854 ns
>       32 bytes |         32.695898 MB/s |    163479488 bytes |  5000000544 ns
>       64 bytes |         64.490739 MB/s |    322453696 bytes |  5000000954 ns
>      128 bytes |        123.285043 MB/s |    616425216 bytes |  5000000201 ns
>      256 bytes |        233.434573 MB/s |   1167172864 bytes |  5000000573 ns
>      512 bytes |        384.405197 MB/s |   1922025984 bytes |  5000000671 ns
>     1024 bytes |        566.313370 MB/s |   2831566848 bytes |  5000001080 ns
>     2048 bytes |        744.518042 MB/s |   3722590208 bytes |  5000000926 ns
>     4096 bytes |        867.501670 MB/s |   4337508352 bytes |  5000002181 ns
> 
> Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt



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