[gnutls-devel] GnuTLS | Support building with Nettle 4 (!2075)

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Daiki Ueno commented on a discussion: https://gitlab.com/gnutls/gnutls/-/merge_requests/2075#note_3121292078


> if we do neither, is the performance hit significant?

I don't think so; the nettle version provides comparable performance (or even outperforms) the CRYPTOGAMS version:

```console
$ gnutls-cli --benchmark-ciphers
[...]
Checking MAC algorithms, payload size: 16384
            SHA1 1.05 GB/sec
          SHA256 0.46 GB/sec
          SHA512 0.68 GB/sec

$ GNUTLS_CPUID_OVERRIDE=0x1 gnutls-cli --benchmark-ciphers
[...]
Checking MAC algorithms, payload size: 16384
            SHA1 2.06 GB/sec
          SHA256 1.93 GB/sec
          SHA512 0.58 GB/sec
```

We may even want to drop the CRYPTOGAMS derived assembly for hashes and macs in 4.0. I've added the topic at https://gitlab.com/gnutls/gnutls/-/wikis/Planning-for-4.0.

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