we check it. panic(err) } return priv, nil } // randomPoint returns a random scalar and the corresponding point using a // procedure equivalent to FIPS 186-5, Appendix A.2.2 (ECDSA Key Pair Generation // by Rejection Sampling) and to Appendix A.3.2 (Per-Message Secret Number // Generation of Private Keys by Rejection Sampling) or Appendix A.3.3 // (Per-Message Secret Number Generation for Deterministic ECDSA) followed by // Step 5 of Section 6.4.1. func randomPoint[P Point[P]](c *Curve[P], generate...