p192

p521: initial `ecdsa` support with FIPS 186-4 test vectors #205

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	6m 12s
doc	19s
build (1.65.0, wasm32-unknown-unknown)	3m 35s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	6m 14s
build (stable, thumbv7em-none-eabi)	37s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 8s
build (stable, wasm32-unknown-unknown)	18s
test (x86_64-unknown-linux-gnu, 1.65.0)	5m 35s
test (x86_64-unknown-linux-gnu, stable)	59s
	24m 57s

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