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diff --git a/lang/js/src/Helpers.js b/lang/js/src/Helpers.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+
+ */
+import { gpgme_error } from "./Errors";
+import { GPGME_Key } from "./Key";
+
+/**
+ * Tries to return an array of fingerprints, either from input fingerprints or
+ * from Key objects
+ * @param {Key |Array<Key>| GPGME_Key | Array<GPGME_Key>|String|Array<String>} input
+ * @returns {Array<String>} Array of fingerprints.
+ */
+
+export function toKeyIdArray(input){
+    if (!input){
+        gpgme_error('MSG_NO_KEYS');
+        return [];
+    }
+    if (!Array.isArray(input)){
+        input = [input];
+    }
+    let result = [];
+    for (let i=0; i < input.length; i++){
+        if (typeof(input[i]) === 'string'){
+            if (isFingerprint(input[i]) === true){
+                result.push(input[i]);
+            } else {
+                gpgme_error('MSG_NOT_A_FPR');
+            }
+        } else if (typeof(input[i]) === 'object'){
+            let fpr = '';
+            if (input[i] instanceof GPGME_Key){
+                fpr = input[i].fingerprint;
+            } else if (input[i].hasOwnProperty('primaryKey') &&
+                input[i].primaryKey.hasOwnProperty('getFingerprint')){
+                    fpr = input[i].primaryKey.getFingerprint();
+            }
+            if (isFingerprint(fpr) === true){
+                result.push(fpr);
+            } else {
+                gpgme_error('MSG_NOT_A_FPR');
+            }
+        } else {
+            return gpgme_error('PARAM_WRONG');
+        }
+    }
+    if (result.length === 0){
+        gpgme_error('MSG_NO_KEYS');
+        return [];
+    } else {
+        return result;
+    }
+};
+
+/**
+ * check if values are valid hexadecimal values of a specified length
+ * @param {*} key input value.
+ * @param {int} len the expected length of the value
+ */
+function hextest(key, len){
+    if (!key || typeof(key) !== "string"){
+        return false;
+    }
+    if (key.length !== len){
+        return false;
+    }
+    let regexp= /^[0-9a-fA-F]*$/i;
+    return regexp.test(key);
+};
+
+/**
+ * check if the input is a valid Hex string with a length of 40
+ */
+export function isFingerprint(string){
+    return hextest(string, 40);
+};
+/**
+ *  TODO no usage; check if the input is a valid Hex string with a length of 16
+ */
+function isLongId(string){
+    return hextest(string, 16);
+};
+
+// TODO still not needed anywhere
+function isShortId(string){
+    return hextest(string, 8);
+};