func GenerateSigEc()

in image/create.go [206:228]

• 19 lines of code
• 4 McCabe index (conditional complexity)

func GenerateSigEc(key sec.PrivSignKey, hash []byte) ([]byte, error) {
	r, s, err := ecdsa.Sign(rand.Reader, key.Ec, hash)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to compute signature")
	}

	ECDSA := ECDSASig{
		R: r,
		S: s,
	}

	signature, err := asn1.Marshal(ECDSA)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to construct signature")
	}

	sigLen := key.SigLen()
	if len(signature) > int(sigLen) {
		return nil, errors.Errorf("signature truncated")
	}

	return signature, nil
}