From 940f6f100fbf73bd42b186cee6d29a2b207f8041 Mon Sep 17 00:00:00 2001
From: Andreas Linde <42185+DerAndereAndi@users.noreply.github.com>
Date: Sat, 1 Oct 2022 19:15:29 +0200
Subject: [PATCH] Check for patched go crypto lib at runtime (#4671)

Panic if the used crypto library is not being used for compiling
---
 server/eebus.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/server/eebus.go b/server/eebus.go
index c1f6e9c20..0ce8f7930 100644
--- a/server/eebus.go
+++ b/server/eebus.go
@@ -19,6 +19,7 @@ import (
 	"github.com/evcc-io/evcc/util"
 	"github.com/evcc-io/evcc/util/machine"
 	"github.com/libp2p/zeroconf/v2"
+	"golang.org/x/crypto/cryptobyte"
 )
 
 var EEBUSDetails = communication.ManufacturerDetails{
@@ -92,6 +93,13 @@ func NewEEBus(other map[string]interface{}) (*EEBus, error) {
 		return nil, err
 	}
 
+	// Test if go is patched for accepting the buggy Elli certificate
+	var res bool
+	b := cryptobyte.String([]byte{0x01, 0x01, 0x01})
+	if ok := b.ReadASN1Boolean(&res); !ok {
+		panic("EEBUS needs a patched go crypto library. Run `make patch-asn1` before compiling.")
+	}
+
 	srv := &server.Server{
 		Log:         log.TRACE,
 		Addr:        cc.Uri,