Optionally user supplied entropy, instead of the browser PRNG

Disabled by default.  Use only if you know what you are doing,
and are using enough entropy.

A hash of the supplied string is used as the random seed.

monero-wallet-generator.html

@@ -8278,6 +8278,8 @@ var cnBase58 = (function () {
         }
         return out.join("");
     }
+    this.bintohex = bintohex;
+    b58.bintohex = bintohex;
 
     function strtobin(str) {
         var res = new Uint8Array(str.length);
@@ -10250,6 +10252,8 @@ bC0zLjUsMjAuNGgtNkwyNDQuOCwzMTAuNkwyNDQuOCwzMTAuNnoiLz4KPC9nPgo8L3N2Zz4K">
         <div class="col s4 right-align ">
                 <input class="btn orange" type="button" onclick="js:genwallet(null);"
                        value="Generate wallet" action=""/>
+                <p>Custom entropy (leave empty to use PRNG)</p>
+                <input type="text" value="" id="user_entropy_widget" />
         </div>
         <div class="col s1 offset-s1"><h4>or</h4></div>
         <div class="col s5 offset-s1">
@@ -10444,21 +10448,28 @@ current_lang='english';
 keys = null;
 function genwallet(lang)
 {
+  spend_key_widget = document.getElementById("spend_key_widget");
+  view_key_widget = document.getElementById("view_key_widget");
+  address_widget = document.getElementById("address_widget");
+  address_qr_widget = document.getElementById("address_qr_widget");
+  mnemonic_widget = document.getElementById("mnemonic_widget");
+  user_entropy_widget = document.getElementById("user_entropy_widget")
+
   if (lang!=null) {
     current_lang = lang;
   }
   else {
-    seed = cnUtil.sc_reduce32(cnUtil.rand_32());
+    var user_entropy = user_entropy_widget.value;
+    if (user_entropy === "") {
+      seed = cnUtil.sc_reduce32(cnUtil.rand_32());
+    }
+    else {
+      seed = cnUtil.sc_reduce32(cnUtil.cn_fast_hash(cnBase58.bintohex(user_entropy)));
+    }
     keys = cnUtil.create_address(seed);
   }
   mnemonic = mn_encode(seed,current_lang);
 
-  spend_key_widget = document.getElementById("spend_key_widget");
-  view_key_widget = document.getElementById("view_key_widget");
-  address_widget = document.getElementById("address_widget");
-  address_qr_widget = document.getElementById("address_qr_widget");
-  mnemonic_widget = document.getElementById("mnemonic_widget");
-
   spend_key_widget.innerHTML = keys.spend.sec;
   view_key_widget.innerHTML = keys.view.sec;
   address_widget.innerHTML = keys.public_addr;

monero-wallet-generator.html.asc

@@ -1,17 +1,17 @@
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+aZkgXOzI2ArMN1LQ/tmQ
+=eAUx
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