dsa

ecdsa: use `EcdsaCurve` in bounds (#792) #551

Job	Run time
build (thumbv7em-none-eabi, 1.72.0)	21s
build (thumbv7em-none-eabi, stable)	20s
test (ubuntu-latest, 1.72.0)	40s
build (wasm32-unknown-unknown, 1.72.0)	22s
test (ubuntu-latest, stable)	36s
build (wasm32-unknown-unknown, stable)	14s
test (macos-latest, 1.72.0)	1m 19s
test (macos-latest, stable)	1m 13s
test (windows-latest, 1.72.0)	1m 13s
test (windows-latest, stable)	1m 53s
	8m 11s

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