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diff --git a/lang/js/DemoExtension/maindemo.js b/lang/js/DemoExtension/maindemo.js
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+/* gpgme.js - Javascript integration for gpgme
+ * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1+
+ *
+ * Author(s):
+ *     Maximilian Krambach <[email protected]>
+ */
+
+/* global document, Gpgmejs */
+
+document.addEventListener('DOMContentLoaded', function () {
+    Gpgmejs.init().then(function (gpgmejs){
+        document.getElementById('buttonencrypt').addEventListener('click',
+            function (){
+                let data = document.getElementById('inputtext').value;
+                let keyId = document.getElementById('pubkey').value;
+                gpgmejs.encrypt(data, keyId).then(
+                    function (answer){
+                        if (answer.data){
+                            document.getElementById(
+                                'answer').value = answer.data;
+                        }
+                    }, function (errormsg){
+                        alert( errormsg.message);
+                    });
+            });
+
+        document.getElementById('buttondecrypt').addEventListener('click',
+            function (){
+                let data = document.getElementById('inputtext').value;
+                gpgmejs.decrypt(data).then(
+                    function (answer){
+                        if (answer.data){
+                            document.getElementById(
+                                'answer').value = answer.data;
+                        }
+                    }, function (errormsg){
+                        alert(errormsg.message);
+                    });
+            });
+
+        document.getElementById('getdefaultkey').addEventListener('click',
+            function (){
+                gpgmejs.Keyring.getDefaultKey().then(function (answer){
+                    document.getElementById('pubkey').value =
+                        answer.fingerprint;
+                }, function (errormsg){
+                    alert(errormsg.message);
+                });
+            });
+
+        document.getElementById('signtext').addEventListener('click',
+            function (){
+                let data = document.getElementById('inputtext').value;
+                let keyId = document.getElementById('pubkey').value;
+                gpgmejs.sign(data, keyId).then(
+                    function (answer){
+                        if (answer.data){
+                            document.getElementById(
+                                'answer').value = answer.data;
+                        }
+                    }, function (errormsg){
+                        alert( errormsg.message);
+                    });
+            });
+
+        document.getElementById('verifytext').addEventListener('click',
+            function (){
+                let data = document.getElementById('inputtext').value;
+                gpgmejs.verify(data).then(
+                    function (answer){
+                        let vals = '';
+                        if (answer.all_valid === true){
+                            vals = 'Success! ';
+                        } else {
+                            vals = 'Failure! ';
+                        }
+                        vals = vals + (answer.count - answer.failures) + 'of '
+                            + answer.count + ' signature(s) were successfully '
+                            + 'verified.\n\n' + answer.data;
+                        document.getElementById('answer').value = vals;
+                    }, function (errormsg){
+                        alert( errormsg.message);
+                    });
+            });
+        document.getElementById('searchkey').addEventListener('click',
+            function (){
+                let data = document.getElementById('inputtext').value;
+                gpgmejs.Keyring.getKeys(data, true, true).then(function (keys){
+                    if (keys.length === 1){
+                        document.getElementById(
+                            'pubkey').value = keys[0].fingerprint;
+                    } else if (keys.length > 1) {
+                        alert('The pattern was not unambigious enough for a Key. '
+                        + keys.length + ' Keys were found');
+                    } else {
+                        alert('No keys found');
+                    }
+                }, function (errormsg){
+                    alert( errormsg.message);
+                });
+            });
+    });
+});