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On Friday, May 12, 2023 at 7:09:38 PM UTC+1 Jeffrey Walton wrote:

> On Fri, May 12, 2023 at 1:09 PM Dwight Kulkarni <dwi...@realtime-7.com> 
> wrote:
> >
> > Update: It seems to be an issue with CFB mode. If I switch to ECB: 12 ms 
> to process the workload.
> >
> > in encrypt aes
> > Encrypted 1at: 05/12/2023 17:06:54.838
> > Encrypted 2at: 05/12/2023 17:06:54.838
> > Encrypted 3at: 05/12/2023 17:06:54.838
> > returning cipher
> > Encrypted 4at: 05/12/2023 17:06:54.850
>
> Yeah, CFB mode is a hard mode in software. The software is effectively
> providing a linear feedback shift register, and it does a lot of
> [non-accelerated] bit twiddling. That's why it needs 4+ cycles to
> process a byte.
>
> I think you would have better results with GCM mode. First, GCM mode
> is an authenticated encryption mode, so you get authenticity
> assurances over the ciphertext. Second, you get hardware acceleration
> with both the bulk cipher encryption (AES), and the mac over the
> ciphertext (GMAC).
>
> Also see https://www.cryptopp.com/wiki/Authenticated_Encryption .
>
> Jeff
>

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