bip32

secrecy: rework the `SecretBox` type (#1140) #758

Job	Run time
build (1.65.0, armv7a-none-eabi)	2m 20s
build (1.65.0, thumbv7em-none-eabi)	2m 28s
build (1.65.0, wasm32-unknown-unknown)	2m 20s
build (stable, armv7a-none-eabi)	17s
build (stable, thumbv7em-none-eabi)	18s
test (ubuntu-latest, 1.65.0)	2m 26s
build (stable, wasm32-unknown-unknown)	22s
test (ubuntu-latest, stable)	24s
test (macos-latest, 1.65.0)	4m 37s
test (macos-latest, stable)	40s
test (windows-latest, 1.65.0)	3m 23s
test (windows-latest, stable)	1m 7s
	20m 42s

Provide feedback