sm3

blake2: add unkeyed hashing (#612) #716

Job	Run time
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	5s
build (1.81.0, thumbv7em-none-eabi)	28s
build (1.81.0, wasm32-unknown-unknown)	19s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	25s
test (1.81.0)	28s
test (stable)	25s
	3m 10s

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