 [det]crypto_name_curve(+Name, 
-Curve)Obtain a handle for a named elliptic curve. Name is an 
atom, and
Curve is unified with an opaque object that represents the 
curve. Currently, only elliptic curves over prime fields are supported. 
Examples of such curves are
[det]crypto_name_curve(+Name, 
-Curve)Obtain a handle for a named elliptic curve. Name is an 
atom, and
Curve is unified with an opaque object that represents the 
curve. Currently, only elliptic curves over prime fields are supported. 
Examples of such curves are prime256v1 and
secp256k1.
If you have OpenSSL installed, you can get a list of supported curves 
via:
$ openssl ecparam -list_curves