acme_ES512.go

package main

import (
	"context"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"errors"
	"log"
	"net/http"

	"golang.org/x/crypto/acme"
)

type MockTransport struct{}

func (mt *MockTransport) RoundTrip(r *http.Request) (*http.Response, error) {
	return nil, errors.New("Not implemented")
}

func main() {

	key, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
	if err != nil {
		log.Fatal("Failed to generate key: ", err)
	}

	cl := &acme.Client{
		Key: key,
		HTTPClient: &http.Client{
			Transport: new(MockTransport),
		},
	}

	_, err = cl.GetReg(context.Background(), "http://example.com/registration")
	if err == acme.ErrUnsupportedKey {
		log.Fatal("Should support ES512 signatures")
	}
}