sha2

implementation of md6 in pure rust #1256

Job	Run time
riscv32-zknh	1m 26s
riscv64-zknh	1m 35s
minimal-versions / minimal-versions	40s
set-msrv / set-msrv	2s
linux (i686-unknown-linux-gnu, 1.81.0, sudo apt update && sudo apt install gcc-multilib)	1m 5s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	47s
linux (x86_64-unknown-linux-gnu, 1.81.0)	51s
build (1.81.0, thumbv7em-none-eabi)	25s
build (1.81.0, wasm32-unknown-unknown)	22s
linux (x86_64-unknown-linux-gnu, stable)	39s
build (1.81.0, loongarch64-unknown-linux-gnu)	18s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	49s
build (stable, thumbv7em-none-eabi)	23s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	38s
build (stable, wasm32-unknown-unknown)	19s
cross (stable, aarch64-unknown-linux-gnu, default)	29s
build (stable, loongarch64-unknown-linux-gnu)	23s
macos (1.81.0)	34s
cross (stable, powerpc-unknown-linux-gnu, default)	32s
macos (stable)	26s
wasm (1.81.0, -C target-feature=-simd128)	58s
windows (1.81.0, x86_64-pc-windows-gnu)	1m 13s
wasm (stable, -C target-feature=-simd128)	49s
windows (stable, x86_64-pc-windows-gnu)	1m 29s
wasm (1.81.0, -C target-feature=+simd128)	35s
wasm (stable, -C target-feature=+simd128)	28s
	18m 15s

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