sha2

Remove dependency on crates from asm-hashes #1033

Job	Run time
minimal-versions / minimal-versions	53s
set-msrv / set-msrv	8s
build (1.72.0, thumbv7em-none-eabi)	21s
linux (i686-unknown-linux-gnu, 1.72.0, sudo apt update && sudo apt install gcc-multilib)	56s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 4s
linux (x86_64-unknown-linux-gnu, 1.72.0)	35s
build (1.72.0, wasm32-unknown-unknown)	22s
macos (1.72.0)	45s
linux (x86_64-unknown-linux-gnu, stable)	33s
build (1.72.0, loongarch64-unknown-linux-gnu)	25s
macos (stable)	55s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	16s
build (stable, loongarch64-unknown-linux-gnu)	26s
cross (1.72.0, aarch64-unknown-linux-gnu, default)	40s
windows (1.72.0, x86_64-pc-windows-gnu)	1m 3s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	49s
windows (stable, x86_64-pc-windows-gnu)	3m 58s
cross (stable, aarch64-unknown-linux-gnu, default)	49s
cross (stable, powerpc-unknown-linux-gnu, default)	39s
	15m 59s

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