Entropy with more than 4 decks can be calculated

[perso/Immae/Projets/Cryptomonnaies/BIP39.git] / bip39-standalone.html

diff --git a/bip39-standalone.html b/bip39-standalone.html
index 4bad422a672a0999a644d43b0fed096dbe49fd26..0da24437181736c881cac998976602e85ebb11cf 100644 (file)
--- a/bip39-standalone.html
+++ b/bip39-standalone.html
@@ -18467,7 +18467,12 @@ window.Entropy = new (function() {
         }
         // Work out the total number of bits for this many decks
         // See http://crypto.stackexchange.com/q/41886
-        var gainedBits = Math.log2(factorial(52 * numberOfDecks));
+        var gainedBits = 0;
+        // Equivalent of Math.log2(factorial(52*numberOfDecks))
+        // which becomes infinity for numberOfDecks > 4
+        for (var i=1; i<=52*numberOfDecks; i++) {
+            gainedBits = gainedBits + Math.log2(i);
+        }
         var lostBits = 52 * Math.log2(factorial(numberOfDecks));
         var maxBits = gainedBits - lostBits;
         // Convert the drawn cards to a binary representation.