aead

elliptic-curve: leverage `CtOption::into_option` #2379

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 39s
build (1.65.0, wasm32-unknown-unknown)	1m 45s
test (1.65.0)	1m 30s
build (stable, thumbv7em-none-eabi)	15s
test (stable)	20s
build (stable, wasm32-unknown-unknown)	18s
	5m 47s

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