Merge pull request #279 from mctrivia/master

Added Split Phrase Card Output

2 files changed, 34 insertions, 0 deletions

diff --git a/src/index.html b/src/index.html
index 95fccc1..8862904 100644
--- a/src/index.html
+++ b/src/index.html
@@ -173,6 +173,12 @@
                             </div>
                         </div>
                         <div class="form-group">
+                            <label for="phrase" class="col-sm-2 control-label">BIP39 Split Mnemonic</label>
+                            <div class="col-sm-10">
+                                <textarea id="phraseSplit" class="phraseSplit private-data form-control" title="Only 2 of 3 cards needed to recover."></textarea>
+                            </div>
+                        </div>
+                        <div class="form-group">
                             <label for="passphrase" class="col-sm-2 control-label">BIP39 Passphrase (optional)</label>
                             <div class="col-sm-10">
                                 <textarea id="passphrase" class="passphrase private-data form-control" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"></textarea>
diff --git a/src/js/index.js b/src/js/index.js
index da901f6..035a2b3 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -44,6 +44,7 @@
     DOM.entropyWeakEntropyOverrideWarning = DOM.entropyContainer.find(".weak-entropy-override-warning");
     DOM.entropyFilterWarning = DOM.entropyContainer.find(".filter-warning");
     DOM.phrase = $(".phrase");
+        DOM.splitPhrase = $(".phraseSplit");
     DOM.passphrase = $(".passphrase");
     DOM.generateContainer = $(".generate-container");
     DOM.generate = $(".generate");
@@ -304,6 +305,7 @@
             clearDisplay();
             clearEntropyFeedback();
             DOM.phrase.val("");
+                        DOM.phraseSplit.val("");
             showValidationError("Blank entropy");
             return;
         }
@@ -338,6 +340,7 @@
         showPending();
         // Clear existing mnemonic and passphrase
         DOM.phrase.val("");
+                DOM.phraseSplit.val("");
         DOM.passphrase.val("");
         seed = null;
         if (rootKeyChangedTimeoutEvent != null) {
@@ -424,6 +427,7 @@
             if (DOM.phrase.val().length > 0) {
                 var newPhrase = convertPhraseToNewLanguage();
                 DOM.phrase.val(newPhrase);
+                                writeSplitPhrase(newPhrase);
                 phraseChanged();
             }
             else {
@@ -484,6 +488,7 @@
         // show the words
         var words = mnemonic.toMnemonic(data);
         DOM.phrase.val(words);
+                writeSplitPhrase(words);
         // show the entropy
         var entropyHex = uint8ArrayToHex(data);
         DOM.entropy.val(entropyHex);
@@ -1422,6 +1427,28 @@
         }
         return phrase;
     }
+        
+        function writeSplitPhrase(phrase) {
+                var wordCount = phrase.split(/\s/g).length;                                                             //get number of words in phrase       
+                var left=[];                                                                                                                    //initialize array of indexs
+                for (var i=0;i<wordCount;i++) left.push(i);                                                             //add all indexs to array
+                var group=[[],[],[]],                                                                                                   //make array for 3 groups
+                        groupI=-1;                                                                                                                      //initialize group index
+                var seed = Math.abs(sjcl.hash.sha256.hash(phrase)[0])% 2147483647;              //start seed at sudo random value based on hash of words
+                while (left.length>0) {                                                                                                 //while indexs left
+                        groupI=(groupI+1)%3;                                                                                            //get next group to insert index into
+                        seed = seed * 16807 % 2147483647;                                                                       //change random value.(simple predicatable random number generator works well for this use)
+                        var selected=Math.floor(left.length*(seed - 1) / 2147483646);           //get index in left we will use for this group
+                        group[groupI].push(left[selected]);                                                                     //add index to group
+                        left.splice(selected,1);                                                                                        //remove selected index
+                }
+                var cards=[phrase.split(/\s/g),phrase.split(/\s/g),phrase.split(/\s/g)];//make array of cards
+                for (var i=0;i<3;i++) {                                                                                                 //go through each card
+                        for (var ii=0;ii<wordCount/3;ii++) cards[i][group[i][ii]]='XXXX';       //erase words listed in the group
+                        cards[i]='Card '+(i+1)+': '+wordArrayToPhrase(cards[i]);                                                                //combine words on card back to string
+                }
+                DOM.splitPhrase.val(cards.join("\r\n"));                                                                //make words visible
+        }
 
     function isUsingOwnEntropy() {
         return DOM.useEntropy.prop("checked");
@@ -1480,6 +1507,7 @@
         var phrase = mnemonic.toMnemonic(entropyArr);
         // Set the mnemonic in the UI
         DOM.phrase.val(phrase);
+                writeSplitPhrase(phrase);
         // Show the word indexes
         showWordIndexes();
         // Show the checksum