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implementation of md6 in pure rust #1134

Job	Run time
minimal-versions / minimal-versions	39s
set-msrv / set-msrv	3s
macos (1.81.0)	39s
build (1.81.0, thumbv7em-none-eabi)	19s
macos (stable)	23s
build (1.81.0, wasm32-unknown-unknown)	25s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	37s
build (1.81.0, loongarch64-unknown-linux-gnu)	18s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	43s
cross (stable, aarch64-unknown-linux-gnu, default)	34s
build (stable, thumbv7em-none-eabi)	13s
linux (x86_64-unknown-linux-gnu, 1.81.0)	35s
cross (stable, powerpc-unknown-linux-gnu, default)	29s
linux (x86_64-unknown-linux-gnu, stable)	31s
build (stable, wasm32-unknown-unknown)	13s
build (stable, loongarch64-unknown-linux-gnu)	20s
windows (x86_64-pc-windows-gnu, 1.81.0)	51s
windows (x86_64-pc-windows-gnu, stable)	1m 56s
	9m 48s

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