Enigma: Enable keypair generation on Internet Explorer 11

CHANGELOG

@@ -77,6 +77,7 @@ CHANGELOG Roundcube Webmail
 - Fix parsing date strings (e.g. from a Date: mail header) with comments (#6216)
 - Fix possible IMAP command injection and type juggling vulnerabilities (#6229)
 - Enigma: Fix key selection for signing
+- Enigma: Enable keypair generation on Internet Explorer 11
 - Fix check_request() bypass in places using get_uids() [CVE-2018-9846] (#6238)
 - Fix bug where usernames without domain part could be malformed or converted to lower-case on logon (#6224)
 

plugins/enigma/enigma.js

@@ -151,7 +151,7 @@ rcube_webmail.prototype.enigma_key_create_save = function()
 
     // generate keys
     // use OpenPGP.js if browser supports required features
-    if (window.openpgp && window.crypto && (window.crypto.getRandomValues || window.crypto.subtle)) {
+    if (window.openpgp && (window.msCrypto || (window.crypto && (window.crypto.getRandomValues || window.crypto.subtle)))) {
         lock = this.set_busy(true, 'enigma.keygenerating');
         options = {
             numBits: size,