sha2

sha1: implement collision detection and mitigation #1089

Job	Run time
set-msrv / set-msrv	2s
minimal-versions / minimal-versions	50s
cross (1.72.0, aarch64-unknown-linux-gnu, default)	48s
build (1.72.0, thumbv7em-none-eabi)	43s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	57s
build (1.72.0, wasm32-unknown-unknown)	21s
cross (stable, aarch64-unknown-linux-gnu, default)	45s
build (1.72.0, loongarch64-unknown-linux-gnu)	22s
cross (stable, powerpc-unknown-linux-gnu, default)	33s
build (stable, thumbv7em-none-eabi)	19s
build (stable, wasm32-unknown-unknown)	22s
build (stable, loongarch64-unknown-linux-gnu)	23s
macos (1.72.0)	39s
linux (i686-unknown-linux-gnu, 1.72.0, sudo apt update && sudo apt install gcc-multilib)	1m 11s
macos (stable)	1m 2s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 11s
windows (1.72.0, x86_64-pc-windows-gnu)	51s
linux (x86_64-unknown-linux-gnu, 1.72.0)	1m 0s
windows (stable, x86_64-pc-windows-gnu)	1m 29s
linux (x86_64-unknown-linux-gnu, stable)	49s
	14m 37s

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