Faster SHA-3 implementations

[erich-9]

Searching for fast Keccak implementations in Julia, I came across @tecosaur's package KangarooTwelve.jl. I think it should be straightforward to extract SHA-3 implementations from it. For example, changing the hardcoded number of rounds from 12 to 24 in ::Val{nrounds}=Val{12}()), the function SHA3-256 can be computed as follows:

tecosaur_sha3_256(message) = KangarooTwelve.turboshake(NTuple{32, UInt8}, message, 0b110, Val(512))

On my machine, it performs better for short messages

julia> msg = zeros(UInt8, 10);

julia> @btime SHA.sha3_256(msg);
  871.358 ns (5 allocations: 688 bytes)

julia> @btime tecosaur_sha3_256(msg);
  437.598 ns (1 allocation: 48 bytes)

and significantly better for long messages:

julia> msg = zeros(UInt8, 100_000_000);

julia> @btime SHA.sha3_256(msg);
  614.836 ms (5 allocations: 688 bytes)

julia> @btime tecosaur_sha3_256(msg);
  218.257 ms (1 allocation: 48 bytes)

I just wanted to leave this observation as a note. Feel free to close the issue.