hmac

Implementation of GMAC #534

Job	Run time
test (1.85.0)	32s
test (stable)	33s
build (1.85.0, thumbv7em-none-eabi)	20s
build (stable, thumbv7em-none-eabi)	23s
build (1.85.0, wasm32-unknown-unknown)	20s
minimal-versions / minimal-versions	25s
build (stable, wasm32-unknown-unknown)	19s
	2m 52s

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