* (Optional) remove bias in password generation

ewpass.js

@@ -10,7 +10,7 @@
 
     var settings = {
         'checksum': undefined,
-        'DEFAULT': [ 16, 1, true ],
+        'DEFAULT': [ 16, 1, true, false ],
         'domains': {}
     };
     var currentDomain = undefined;
@@ -44,6 +44,9 @@
         var n = 0;
 
         while (m > 0) {
+            if (!allowBias && m < l)
+                break;
+
             m = Math.floor(m / l);
             n++;
         }
@@ -100,6 +103,7 @@
             $('#iteration').prop('disabled', 'disabled');
             $('#nextiter').prop('disabled', 'disabled');
             $('#extended').prop('disabled', 'disabled');
+            $('#allowbias').prop('disabled', 'disabled');
             $('#storedomain').prop('disabled', 'disabled');
             $('#docopy').prop('disabled', 'disabled');
 
@@ -122,11 +126,18 @@
         $('#iteration').val(_settings[1]);
         $('#extended').prop('checked', _settings[2] ? 'checked' : '');
 
+        if (_settings[3] === undefined) {
+            $('#allowbias').prop('checked', 'checked');
+        } else {
+            $('#allowbias').prop('checked', _settings[3] ? 'checked' : '');
+        }
+
         if (_settings !== settings.DEFAULT) {
             $('#length').prop('disabled', '');
             $('#iteration').prop('disabled', '');
             $('#nextiter').prop('disabled', '');
             $('#extended').prop('disabled', '');
+            $('#allowbias').prop('disabled', '');
             $('#storedomain').prop('disabled', '');
             $('#docopy').prop('disabled', '');
 
@@ -138,7 +149,8 @@
         _settings = [
             parseInt($('#length').val()),
             parseInt($('#iteration').val()),
-            $('#extended').prop('checked')
+            $('#extended').prop('checked'),
+            $('#allowbias').prop('checked')
         ];
 
         settings.domains[currentDomain] = _settings;
@@ -162,7 +174,7 @@
 
         const ENTROPY_SIZE = 8;
         const map = settings.domains[currentDomain][2] ? EXTENDED_MAP : BASIC_MAP;
-        const rounds = calcRounds(map.length);
+        const rounds = calcRounds(map.length, settings.domains[currentDomain][3] === undefined ? true : settings.domains[currentDomain][3]);
 
         if (settings.domains[currentDomain][0] > ENTROPY_SIZE * rounds) {
             settings.domains[currentDomain][0] = ENTROPY_SIZE * rounds;

index.html

@@ -51,6 +51,16 @@
                                     <label><input type="checkbox" id="extended" checked="checked" /> Use special characters</label>
                                 </td>
                             </tr>
+                            <tr>
+                                <td colspan="2">
+                                    <label>
+                                        <input type="checkbox" id="allowbias" /> Use all entropy<br />
+                                        <div style="padding-left: 2em; font-size: 70%;">
+                                            (Allows for longer passwords, but <br />makes them slightly more predictable)
+                                        </div>
+                                    </label>
+                                </td>
+                            </tr>
                             <tr>
                                 <td colspan="2">
                                     <input type="button" id="storedomain" value="Store" onclick="ewpass.storeSettingsForDomain();" />