block-buffer: remove dependency on crypto-common #705

Job	Run time
build (1.60.0, armv7a-none-eabi)	50s
build (1.60.0, thumbv7em-none-eabi)	51s
build (1.60.0, wasm32-unknown-unknown)	58s
cross (aarch64-unknown-linux-gnu, 1.60.0)	1m 8s
build (stable, armv7a-none-eabi)	14s
cross (aarch64-unknown-linux-gnu, stable)	31s
build (stable, thumbv7em-none-eabi)	14s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	1m 7s
cross (powerpc-unknown-linux-gnu, 1.60.0)	1m 9s
build (stable, wasm32-unknown-unknown)	13s
cross (powerpc-unknown-linux-gnu, stable)	43s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	21s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	51s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	19s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	6s
x86 (x86_64-unknown-linux-gnu, stable)	13s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	53s
test (x86_64-apple-darwin, macos-latest, stable)	14s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	37s
test (x86_64-pc-windows-msvc, windows-latest, stable)	2m 35s
minimal-versions / minimal-versions	52s
	14m 59s

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