Pick a curve
c := elliptic.P256()
// Pass into ecdsa.GenerateKey / ecdh.P256(), etc.crypto/elliptic
Named NIST curves (P-224, P-256, P-384, P-521). Most new code uses crypto/ecdsa or crypto/ecdh instead — this is the lower-level curve API.
Usage
Point encoding
// Marshal/Unmarshal is deprecated in new code;
// use crypto/ecdh for exchange and crypto/ecdsa for signatures.