[PATCH] digest-openssl: improve OpenSSL v3 support

[Damien Miller]

On Sun, 31 Aug 2025, Dimitri John Ledkov wrote:

> From OpenSSL v3 documentation https://docs.openssl.org/3.0/man3/EVP_sha1/#notes:
> 
>   Developers should be aware of the negative performance implications
>   of calling this function multiple times and should consider using
>   EVP_MD_fetch(3) with EVP_MD-SHA1(7) instead. See "Performance" in
>   crypto(7) for further information.

hash/MAC instantiation doesn't happen very often in OpenSSH. Does this
change yield any observable performance benefit? ("make unit-bench"
might help here).

-d