can encode and autodecode but using own keys at this time

.gitignore

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+/*~

lor-cryptomsg.js

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+// ==UserScript==
+// @name       CryptoMessages for LOR
+// @namespace  ru.bvn13.lor.cryptomsg
+// @version    0.1
+// @description  Brings private dialogs for LOR
+// @include     https://www.linux.org.ru/*
+// @grant       none
+// @copyright  2018+, bvn13
+// @require http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js
+// @require http://travistidwell.com/jsencrypt/bin/jsencrypt.js
+// ==/UserScript==
+
+(function() {
+
+
+    var publicKey = `-----BEGIN PUBLIC KEY-----
+MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlOJu6TyygqxfWT7eLtGDwajtN
+FOb9I5XRb6khyfD1Yt3YiCgQWMNW649887VGJiGr/L5i2osbl8C9+WJTeucF+S76
+xFxdU6jE0NQ+Z+zEdhUTooNRaY5nZiu5PgDB0ED/ZKBUSLKL7eibMxZtMlUDHjm4
+gwQco1KRMDSmXSMkDwIDAQAB
+-----END PUBLIC KEY-----`;
+
+    var privateKey = `-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----`;
+
+    var encryptedRegexp = /\[ENCRYPTED\]([\s\S]+)\[\/ENCRYPTED\]/mgi;
+
+    var insertText = function(textarea, text) {
+
+        var startPos = textarea.selectionStart;
+        var endPos = textarea.selectionEnd;
+
+        textarea.value = textarea.value.substring(0, startPos)
+            + '\n\n' + text + '\n\n'
+            + textarea.value.substring(endPos, textarea.value.length);
+
+        textarea.selectionStart = startPos + text.length;
+        textarea.selectionEnd = startPos + text.length;
+
+    }
+
+    var decryptFn = function(messageTag) {
+
+        var msg = messageTag.querySelectorAll('p');
+
+        if (msg && msg.length)  {
+
+            Array.prototype.forEach.call(msg, function(p) {
+                var msg = p.innerText;
+                if (msg.trim() != '' && encryptedRegexp.test(msg)) {
+
+                    msg = msg.replace(encryptedRegexp, '$1').trim();
+
+                    var decrypt = new JSEncrypt.JSEncrypt();
+                    decrypt.setPrivateKey(privateKey);
+
+                    var decryptedMsg = decrypt.decrypt(msg);
+                    p.innerText = '[DECRYPTED]'+decryptedMsg+'[/DECRYTED]';
+                }
+            });
+        }
+    }
+
+    var insertEncryptButton = function(textarea) {
+
+        var button = document.createElement('input');
+        button.type = 'button';
+        button.value = 'Encrypt it!';
+        textarea.parentNode.insertBefore(button, textarea.nextSibling);
+
+        button.addEventListener('click', function() {
+
+            var startPos = textarea.selectionStart;
+            var endPos = textarea.selectionEnd;
+            var msg = textarea.value.substring(startPos, endPos);
+
+            if (msg.trim() == '') {
+                alert('Nothing to encrypt! Please select text.');
+                return;
+            }
+
+            var encrypt = new JSEncrypt.JSEncrypt();
+            encrypt.setPublicKey(publicKey);
+
+            var encryptedMsg = encrypt.encrypt(msg);
+            insertText(textarea, '\n\n[ENCRYPTED]' + encryptedMsg + '[/ENCRYPTED]\n\n');
+
+        });
+
+        var description = document.createElement('div');
+        description.innerHTML = 'Зашифровать выделенный текст';
+        textarea.parentNode.insertBefore(description, button);
+
+    }
+
+
+    window.addEventListener('load', function() {
+
+        //loadProto(function() {
+            console.log("JSEncrypt has been loaded");
+
+            //autodecrypt
+            var messages = $('.msg_body');
+            if (messages && messages.length) {
+                Array.prototype.forEach.call(messages, decryptFn);
+            }
+
+            //create Encrypt button
+            var textareas = document.getElementsByTagName('textarea');
+            if (textareas && textareas.length) {
+                Array.prototype.forEach.call(textareas, insertEncryptButton);
+            }
+
+        //});
+
+
+    });
+
+})();