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implementation of md6 in pure rust #1136

Job	Run time
minimal-versions / minimal-versions	38s
set-msrv / set-msrv	5s
build (1.81.0, thumbv7em-none-eabi)	25s
build (1.81.0, wasm32-unknown-unknown)	19s
build (1.81.0, loongarch64-unknown-linux-gnu)	20s
linux (x86_64-unknown-linux-gnu, 1.81.0)	35s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	12s
linux (x86_64-unknown-linux-gnu, stable)	27s
build (stable, loongarch64-unknown-linux-gnu)	15s
macos (1.81.0)	27s
windows (x86_64-pc-windows-gnu, 1.81.0)	58s
macos (stable)	21s
windows (x86_64-pc-windows-gnu, stable)	2m 6s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	48s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	36s
cross (stable, aarch64-unknown-linux-gnu, default)	52s
cross (stable, powerpc-unknown-linux-gnu, default)	29s
	10m 11s

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