fix(GODT-2625): Update bridge pubkey and add option to verify in hasher.

internal/updater/keyring.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2023 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+package updater
+
+import (
+	"github.com/ProtonMail/gopenpgp/v2/crypto"
+	"github.com/sirupsen/logrus"
+)
+
+func GetDefaultKeyring() (*crypto.KeyRing, error) {
+	l := logrus.WithField("pkg", "updater")
+
+	key, err := crypto.NewKeyFromArmored(DefaultPublicKey)
+	if err != nil {
+		l.WithError(err).Error("Failed to create new verification key")
+		return nil, err
+	}
+
+	kr, err := crypto.NewKeyRing(key)
+	if err != nil {
+		l.WithError(err).Fatal("Failed to create new verification keyring")
+	}
+
+	return kr, nil
+}