blake2: add unkeyed hashing (#612) #116

Job	Run time
minimal-versions	0s
set-msrv / set-msrv	2s
build (1.81.0, thumbv7em-none-eabi)	26s
build (1.81.0, wasm32-unknown-unknown)	18s
build (1.81.0, loongarch64-unknown-linux-gnu)	19s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	24s
build (stable, loongarch64-unknown-linux-gnu)	21s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	43s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	40s
linux (x86_64-unknown-linux-gnu, 1.81.0)	40s
cross (stable, aarch64-unknown-linux-gnu, default)	40s
linux (x86_64-unknown-linux-gnu, stable)	37s
cross (stable, powerpc-unknown-linux-gnu, default)	57s
macos (1.81.0)	42s
windows (x86_64-pc-windows-gnu, 1.81.0)	1m 2s
macos (stable)	26s
windows (x86_64-pc-windows-gnu, stable)	2m 13s
	10m 50s

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