References: crypto/internal/fips140/ecdsa.

var crypto/internal/fips140/ecdsa._P521

2 uses

	crypto/internal/fips140/ecdsa (current package)
		ecdsa.go#L137: func P521() *Curve[*nistec.P521Point] { return _P521() }
		ecdsa.go#L139: var _P521 = sync.OnceValue(func() *Curve[*nistec.P521Point] {

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