get Jwk Curve
Extracts the cryptographic curve information from a Jwk object.
This function parses and returns the curve type used in a Jwk. May return null
if the curve information is not present or unsupported.
Return
The JwaCurve used in the Jwk, or null
if the curve is not defined or recognized.
Parameters
jwk
The Jwk object from which to extract curve information.