hmac

Implementation of GMAC #524

Job	Run time
test (stable)	11s
test (1.85.0)	8s
build (1.85.0, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	12s
build (stable, thumbv7em-none-eabi)	11s
build (1.85.0, wasm32-unknown-unknown)	13s
minimal-versions / minimal-versions	15s
	1m 27s

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