src/js/index.js

   1 (function() {
   2
   3     // mnemonics is populated as required by getLanguage
   4     var mnemonics = { "english": new Mnemonic("english") };
   5     var mnemonic = mnemonics["english"];
   6     var seed = null
   7     var bip32RootKey = null;
   8     var bip32ExtendedKey = null;
   9     var network = bitcoin.networks.bitcoin;
  10     var addressRowTemplate = $("#address-row-template");
  11
  12     var showIndex = true;
  13     var showAddress = true;
  14     var showPubKey = true;
  15     var showPrivKey = true;
  16     var showQr = false;
  17
  18     var entropyChangeTimeoutEvent = null;
  19     var phraseChangeTimeoutEvent = null;
  20     var rootKeyChangedTimeoutEvent = null;
  21
  22     var DOM = {};
  23     DOM.network = $(".network");
  24     DOM.phraseNetwork = $("#network-phrase");
  25     DOM.useEntropy = $(".use-entropy");
  26     DOM.entropyContainer = $(".entropy-container");
  27     DOM.entropy = $(".entropy");
  28     DOM.entropyFiltered = DOM.entropyContainer.find(".filtered");
  29     DOM.entropyType = DOM.entropyContainer.find(".type");
  30     DOM.entropyStrength = DOM.entropyContainer.find(".strength");
  31     DOM.entropyEventCount = DOM.entropyContainer.find(".event-count");
  32     DOM.entropyBits = DOM.entropyContainer.find(".bits");
  33     DOM.entropyBitsPerEvent = DOM.entropyContainer.find(".bits-per-event");
  34     DOM.entropyWordCount = DOM.entropyContainer.find(".word-count");
  35     DOM.entropyBinary = DOM.entropyContainer.find(".binary");
  36     DOM.entropyMnemonicLength = DOM.entropyContainer.find(".mnemonic-length");
  37     DOM.phrase = $(".phrase");
  38     DOM.passphrase = $(".passphrase");
  39     DOM.generateContainer = $(".generate-container");
  40     DOM.generate = $(".generate");
  41     DOM.seed = $(".seed");
  42     DOM.rootKey = $(".root-key");
  43     DOM.extendedPrivKey = $(".extended-priv-key");
  44     DOM.extendedPubKey = $(".extended-pub-key");
  45     DOM.bip32tab = $("#bip32-tab");
  46     DOM.bip44tab = $("#bip44-tab");
  47     DOM.bip32panel = $("#bip32");
  48     DOM.bip44panel = $("#bip44");
  49     DOM.bip32path = $("#bip32-path");
  50     DOM.bip44path = $("#bip44-path");
  51     DOM.bip44purpose = $("#bip44 .purpose");
  52     DOM.bip44coin = $("#bip44 .coin");
  53     DOM.bip44account = $("#bip44 .account");
  54     DOM.bip44accountXprv = $("#bip44 .account-xprv");
  55     DOM.bip44accountXpub = $("#bip44 .account-xpub");
  56     DOM.bip44change = $("#bip44 .change");
  57     DOM.generatedStrength = $(".generate-container .strength");
  58     DOM.hardenedAddresses = $(".hardened-addresses");
  59     DOM.addresses = $(".addresses");
  60     DOM.rowsToAdd = $(".rows-to-add");
  61     DOM.more = $(".more");
  62     DOM.feedback = $(".feedback");
  63     DOM.tab = $(".derivation-type a");
  64     DOM.indexToggle = $(".index-toggle");
  65     DOM.addressToggle = $(".address-toggle");
  66     DOM.publicKeyToggle = $(".public-key-toggle");
  67     DOM.privateKeyToggle = $(".private-key-toggle");
  68     DOM.languages = $(".languages a");
  69     DOM.qrContainer = $(".qr-container");
  70     DOM.qrHider = DOM.qrContainer.find(".qr-hider");
  71     DOM.qrImage = DOM.qrContainer.find(".qr-image");
  72     DOM.qrHint = DOM.qrContainer.find(".qr-hint");
  73     DOM.showQrEls = $("[data-show-qr]");
  74
  75     function init() {
  76         // Events
  77         DOM.network.on("change", networkChanged);
  78         DOM.useEntropy.on("change", setEntropyVisibility);
  79         DOM.entropy.on("input", delayedEntropyChanged);
  80         DOM.entropyMnemonicLength.on("change", entropyChanged);
  81         DOM.phrase.on("input", delayedPhraseChanged);
  82         DOM.passphrase.on("input", delayedPhraseChanged);
  83         DOM.generate.on("click", generateClicked);
  84         DOM.more.on("click", showMore);
  85         DOM.rootKey.on("input", delayedRootKeyChanged);
  86         DOM.bip32path.on("input", calcForDerivationPath);
  87         DOM.bip44purpose.on("input", calcForDerivationPath);
  88         DOM.bip44coin.on("input", calcForDerivationPath);
  89         DOM.bip44account.on("input", calcForDerivationPath);
  90         DOM.bip44change.on("input", calcForDerivationPath);
  91         DOM.tab.on("shown.bs.tab", calcForDerivationPath);
  92         DOM.hardenedAddresses.on("change", calcForDerivationPath);
  93         DOM.indexToggle.on("click", toggleIndexes);
  94         DOM.addressToggle.on("click", toggleAddresses);
  95         DOM.publicKeyToggle.on("click", togglePublicKeys);
  96         DOM.privateKeyToggle.on("click", togglePrivateKeys);
  97         DOM.languages.on("click", languageChanged);
  98         setQrEvents(DOM.showQrEls);
  99         disableForms();
 100         hidePending();
 101         hideValidationError();
 102         populateNetworkSelect();
 103     }
 104
 105     // Event handlers
 106
 107     function networkChanged(e) {
 108         var networkIndex = e.target.value;
 109         networks[networkIndex].onSelect();
 110         if (seed != null) {
 111             phraseChanged();
 112         }
 113         else {
 114             rootKeyChanged();
 115         }
 116     }
 117
 118     function setEntropyVisibility() {
 119         if (isUsingOwnEntropy()) {
 120             DOM.entropyContainer.removeClass("hidden");
 121             DOM.generateContainer.addClass("hidden");
 122             DOM.phrase.prop("readonly", true);
 123             DOM.entropy.focus();
 124             entropyChanged();
 125         }
 126         else {
 127             DOM.entropyContainer.addClass("hidden");
 128             DOM.generateContainer.removeClass("hidden");
 129             DOM.phrase.prop("readonly", false);
 130             hidePending();
 131         }
 132     }
 133
 134     function delayedPhraseChanged() {
 135         hideValidationError();
 136         showPending();
 137         if (phraseChangeTimeoutEvent != null) {
 138             clearTimeout(phraseChangeTimeoutEvent);
 139         }
 140         phraseChangeTimeoutEvent = setTimeout(phraseChanged, 400);
 141     }
 142
 143     function phraseChanged() {
 144         showPending();
 145         hideValidationError();
 146         setMnemonicLanguage();
 147         // Get the mnemonic phrase
 148         var phrase = DOM.phrase.val();
 149         var errorText = findPhraseErrors(phrase);
 150         if (errorText) {
 151             showValidationError(errorText);
 152             return;
 153         }
 154         // Calculate and display
 155         var passphrase = DOM.passphrase.val();
 156         calcBip32RootKeyFromSeed(phrase, passphrase);
 157         calcForDerivationPath();
 158         hidePending();
 159     }
 160
 161     function delayedEntropyChanged() {
 162         hideValidationError();
 163         showPending();
 164         if (entropyChangeTimeoutEvent != null) {
 165             clearTimeout(entropyChangeTimeoutEvent);
 166         }
 167         entropyChangeTimeoutEvent = setTimeout(entropyChanged, 400);
 168     }
 169
 170     function entropyChanged() {
 171         // If blank entropy, clear mnemonic, addresses, errors
 172         if (DOM.entropy.val().trim().length == 0) {
 173             clearDisplay();
 174             clearEntropyFeedback();
 175             DOM.phrase.val("");
 176             showValidationError("Blank entropy");
 177             return;
 178         }
 179         // Get the current phrase to detect changes
 180         var phrase = DOM.phrase.val();
 181         // Set the phrase from the entropy
 182         setMnemonicFromEntropy();
 183         // Recalc addresses if the phrase has changed
 184         var newPhrase = DOM.phrase.val();
 185         if (newPhrase != phrase) {
 186             if (newPhrase.length == 0) {
 187                 clearDisplay();
 188             }
 189             else {
 190                 phraseChanged();
 191             }
 192         }
 193         else {
 194             hidePending();
 195         }
 196     }
 197
 198     function delayedRootKeyChanged() {
 199         // Warn if there is an existing mnemonic or passphrase.
 200         if (DOM.phrase.val().length > 0 || DOM.passphrase.val().length > 0) {
 201             if (!confirm("This will clear existing mnemonic and passphrase")) {
 202                 DOM.rootKey.val(bip32RootKey);
 203                 return
 204             }
 205         }
 206         hideValidationError();
 207         showPending();
 208         // Clear existing mnemonic and passphrase
 209         DOM.phrase.val("");
 210         DOM.passphrase.val("");
 211         seed = null;
 212         if (rootKeyChangedTimeoutEvent != null) {
 213             clearTimeout(rootKeyChangedTimeoutEvent);
 214         }
 215         rootKeyChangedTimeoutEvent = setTimeout(rootKeyChanged, 400);
 216     }
 217
 218     function rootKeyChanged() {
 219         showPending();
 220         hideValidationError();
 221         // Validate the root key TODO
 222         var rootKeyBase58 = DOM.rootKey.val();
 223         var errorText = validateRootKey(rootKeyBase58);
 224         if (errorText) {
 225             showValidationError(errorText);
 226             return;
 227         }
 228         // Calculate and display
 229         calcBip32RootKeyFromBase58(rootKeyBase58);
 230         calcForDerivationPath();
 231     }
 232
 233     function calcForDerivationPath() {
 234         showPending();
 235         clearAddressesList();
 236         hideValidationError();
 237         // Get the derivation path
 238         var derivationPath = getDerivationPath();
 239         var errorText = findDerivationPathErrors(derivationPath);
 240         if (errorText) {
 241             showValidationError(errorText);
 242             return;
 243         }
 244         bip32ExtendedKey = calcBip32ExtendedKey(derivationPath);
 245         if (bip44TabSelected()) {
 246             displayBip44Info();
 247         }
 248         displayBip32Info();
 249         hidePending();
 250     }
 251
 252     function generateClicked() {
 253         if (isUsingOwnEntropy()) {
 254             return;
 255         }
 256         clearDisplay();
 257         showPending();
 258         setTimeout(function() {
 259             setMnemonicLanguage();
 260             var phrase = generateRandomPhrase();
 261             if (!phrase) {
 262                 return;
 263             }
 264             phraseChanged();
 265         }, 50);
 266     }
 267
 268     function languageChanged() {
 269         setTimeout(function() {
 270             setMnemonicLanguage();
 271             if (DOM.phrase.val().length > 0) {
 272                 var newPhrase = convertPhraseToNewLanguage();
 273                 DOM.phrase.val(newPhrase);
 274                 phraseChanged();
 275             }
 276             else {
 277                 DOM.generate.trigger("click");
 278             }
 279         }, 50);
 280     }
 281
 282     function toggleIndexes() {
 283         showIndex = !showIndex;
 284         $("td.index span").toggleClass("invisible");
 285     }
 286
 287     function toggleAddresses() {
 288         showAddress = !showAddress;
 289         $("td.address span").toggleClass("invisible");
 290     }
 291
 292     function togglePublicKeys() {
 293         showPubKey = !showPubKey;
 294         $("td.pubkey span").toggleClass("invisible");
 295     }
 296
 297     function togglePrivateKeys() {
 298         showPrivKey = !showPrivKey;
 299         $("td.privkey span").toggleClass("invisible");
 300     }
 301
 302     // Private methods
 303
 304     function generateRandomPhrase() {
 305         if (!hasStrongRandom()) {
 306             var errorText = "This browser does not support strong randomness";
 307             showValidationError(errorText);
 308             return;
 309         }
 310         var numWords = parseInt(DOM.generatedStrength.val());
 311         var strength = numWords / 3 * 32;
 312         var words = mnemonic.generate(strength);
 313         DOM.phrase.val(words);
 314         return words;
 315     }
 316
 317     function calcBip32RootKeyFromSeed(phrase, passphrase) {
 318         seed = mnemonic.toSeed(phrase, passphrase);
 319         bip32RootKey = bitcoin.HDNode.fromSeedHex(seed, network);
 320     }
 321
 322     function calcBip32RootKeyFromBase58(rootKeyBase58) {
 323         bip32RootKey = bitcoin.HDNode.fromBase58(rootKeyBase58, network);
 324     }
 325
 326     function calcBip32ExtendedKey(path) {
 327         var extendedKey = bip32RootKey;
 328         // Derive the key from the path
 329         var pathBits = path.split("/");
 330         for (var i=0; i<pathBits.length; i++) {
 331             var bit = pathBits[i];
 332             var index = parseInt(bit);
 333             if (isNaN(index)) {
 334                 continue;
 335             }
 336             var hardened = bit[bit.length-1] == "'";
 337             var isPriv = "privKey" in extendedKey;
 338             var invalidDerivationPath = hardened && !isPriv;
 339             if (invalidDerivationPath) {
 340                 extendedKey = null;
 341             }
 342             else if (hardened) {
 343                 extendedKey = extendedKey.deriveHardened(index);
 344             }
 345             else {
 346                 extendedKey = extendedKey.derive(index);
 347             }
 348         }
 349         return extendedKey
 350     }
 351
 352     function showValidationError(errorText) {
 353         DOM.feedback
 354             .text(errorText)
 355             .show();
 356     }
 357
 358     function hideValidationError() {
 359         DOM.feedback
 360             .text("")
 361             .hide();
 362     }
 363
 364     function findPhraseErrors(phrase) {
 365         // Preprocess the words
 366         phrase = mnemonic.normalizeString(phrase);
 367         var words = phraseToWordArray(phrase);
 368         // Detect blank phrase
 369         if (words.length == 0) {
 370             return "Blank mnemonic";
 371         }
 372         // Check each word
 373         for (var i=0; i<words.length; i++) {
 374             var word = words[i];
 375             var language = getLanguage();
 376             if (WORDLISTS[language].indexOf(word) == -1) {
 377                 console.log("Finding closest match to " + word);
 378                 var nearestWord = findNearestWord(word);
 379                 return word + " not in wordlist, did you mean " + nearestWord + "?";
 380             }
 381         }
 382         // Check the words are valid
 383         var properPhrase = wordArrayToPhrase(words);
 384         var isValid = mnemonic.check(properPhrase);
 385         if (!isValid) {
 386             return "Invalid mnemonic";
 387         }
 388         return false;
 389     }
 390
 391     function validateRootKey(rootKeyBase58) {
 392         try {
 393             bitcoin.HDNode.fromBase58(rootKeyBase58);
 394         }
 395         catch (e) {
 396             return "Invalid root key";
 397         }
 398         return "";
 399     }
 400
 401     function getDerivationPath() {
 402         if (bip44TabSelected()) {
 403             var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);
 404             var coin = parseIntNoNaN(DOM.bip44coin.val(), 0);
 405             var account = parseIntNoNaN(DOM.bip44account.val(), 0);
 406             var change = parseIntNoNaN(DOM.bip44change.val(), 0);
 407             var path = "m/";
 408             path += purpose + "'/";
 409             path += coin + "'/";
 410             path += account + "'/";
 411             path += change;
 412             DOM.bip44path.val(path);
 413             var derivationPath = DOM.bip44path.val();
 414             console.log("Using derivation path from BIP44 tab: " + derivationPath);
 415             return derivationPath;
 416         }
 417         else if (bip32TabSelected()) {
 418             var derivationPath = DOM.bip32path.val();
 419             console.log("Using derivation path from BIP32 tab: " + derivationPath);
 420             return derivationPath;
 421         }
 422         else {
 423             console.log("Unknown derivation path");
 424         }
 425     }
 426
 427     function findDerivationPathErrors(path) {
 428         // TODO is not perfect but is better than nothing
 429         // Inspired by
 430         // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#test-vectors
 431         // and
 432         // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#extended-keys
 433         var maxDepth = 255; // TODO verify this!!
 434         var maxIndexValue = Math.pow(2, 31); // TODO verify this!!
 435         if (path[0] != "m") {
 436             return "First character must be 'm'";
 437         }
 438         if (path.length > 1) {
 439             if (path[1] != "/") {
 440                 return "Separator must be '/'";
 441             }
 442             var indexes = path.split("/");
 443             if (indexes.length > maxDepth) {
 444                 return "Derivation depth is " + indexes.length + ", must be less than " + maxDepth;
 445             }
 446             for (var depth = 1; depth<indexes.length; depth++) {
 447                 var index = indexes[depth];
 448                 var invalidChars = index.replace(/^[0-9]+'?$/g, "")
 449                 if (invalidChars.length > 0) {
 450                     return "Invalid characters " + invalidChars + " found at depth " + depth;
 451                 }
 452                 var indexValue = parseInt(index.replace("'", ""));
 453                 if (isNaN(depth)) {
 454                     return "Invalid number at depth " + depth;
 455                 }
 456                 if (indexValue > maxIndexValue) {
 457                     return "Value of " + indexValue + " at depth " + depth + " must be less than " + maxIndexValue;
 458                 }
 459             }
 460         }
 461         // Check no hardened derivation path when using xpub keys
 462         var hardened = path.indexOf("'") > -1;
 463         var isXpubkey = !("privKey" in bip32RootKey);
 464         if (hardened && isXpubkey) {
 465             return "Hardened derivation path is invalid with xpub key";
 466         }
 467         return false;
 468     }
 469
 470     function displayBip44Info() {
 471         // Get the derivation path for the account
 472         var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);
 473         var coin = parseIntNoNaN(DOM.bip44coin.val(), 0);
 474         var account = parseIntNoNaN(DOM.bip44account.val(), 0);
 475         var path = "m/";
 476         path += purpose + "'/";
 477         path += coin + "'/";
 478         path += account + "'/";
 479         // Calculate the account extended keys
 480         var accountExtendedKey = calcBip32ExtendedKey(path);
 481         var accountXprv = accountExtendedKey.toBase58();
 482         var accountXpub = accountExtendedKey.toBase58(false);
 483         // Display the extended keys
 484         DOM.bip44accountXprv.val(accountXprv);
 485         DOM.bip44accountXpub.val(accountXpub);
 486     }
 487
 488     function displayBip32Info() {
 489         // Display the key
 490         DOM.seed.val(seed);
 491         var rootKey = bip32RootKey.toBase58();
 492         DOM.rootKey.val(rootKey);
 493         var xprvkeyB58 = "NA";
 494         if (bip32ExtendedKey.privKey) {
 495             xprvkeyB58 = bip32ExtendedKey.toBase58();
 496         }
 497         var extendedPrivKey = xprvkeyB58;
 498         DOM.extendedPrivKey.val(extendedPrivKey);
 499         var extendedPubKey = bip32ExtendedKey.toBase58(false);
 500         DOM.extendedPubKey.val(extendedPubKey);
 501         // Display the addresses and privkeys
 502         clearAddressesList();
 503         displayAddresses(0, 20);
 504     }
 505
 506     function displayAddresses(start, total) {
 507         for (var i=0; i<total; i++) {
 508             var index = i + start;
 509             new TableRow(index);
 510         }
 511     }
 512
 513     function TableRow(index) {
 514
 515         var useHardenedAddresses = DOM.hardenedAddresses.prop("checked");
 516
 517         function init() {
 518             calculateValues();
 519         }
 520
 521         function calculateValues() {
 522             setTimeout(function() {
 523                 var key = "";
 524                 if (useHardenedAddresses) {
 525                     key = bip32ExtendedKey.deriveHardened(index);
 526                 }
 527                 else {
 528                     key = bip32ExtendedKey.derive(index);
 529                 }
 530                 var address = key.getAddress().toString();
 531                 var privkey = "NA";
 532                 if (key.privKey) {
 533                     privkey = key.privKey.toWIF(network);
 534                 }
 535                 var pubkey = key.pubKey.toHex();
 536                 var indexText = getDerivationPath() + "/" + index;
 537                 if (useHardenedAddresses) {
 538                     indexText = indexText + "'";
 539                 }
 540                 addAddressToList(indexText, address, pubkey, privkey);
 541             }, 50)
 542         }
 543
 544         init();
 545
 546     }
 547
 548     function showMore() {
 549         var start = DOM.addresses.children().length;
 550         var rowsToAdd = parseInt(DOM.rowsToAdd.val());
 551         if (isNaN(rowsToAdd)) {
 552             rowsToAdd = 20;
 553             DOM.rowsToAdd.val("20");
 554         }
 555         if (rowsToAdd > 200) {
 556             var msg = "Generating " + rowsToAdd + " rows could take a while. ";
 557             msg += "Do you want to continue?";
 558             if (!confirm(msg)) {
 559                 return;
 560             }
 561         }
 562         displayAddresses(start, rowsToAdd);
 563     }
 564
 565     function clearDisplay() {
 566         clearAddressesList();
 567         clearKey();
 568         hideValidationError();
 569     }
 570
 571     function clearAddressesList() {
 572         DOM.addresses.empty();
 573     }
 574
 575     function clearKey() {
 576         DOM.rootKey.val("");
 577         DOM.extendedPrivKey.val("");
 578         DOM.extendedPubKey.val("");
 579     }
 580
 581     function addAddressToList(indexText, address, pubkey, privkey) {
 582         var row = $(addressRowTemplate.html());
 583         // Elements
 584         var indexCell = row.find(".index span");
 585         var addressCell = row.find(".address span");
 586         var pubkeyCell = row.find(".pubkey span");
 587         var privkeyCell = row.find(".privkey span");
 588         // Content
 589         indexCell.text(indexText);
 590         addressCell.text(address);
 591         pubkeyCell.text(pubkey);
 592         privkeyCell.text(privkey);
 593         // Visibility
 594         if (!showIndex) {
 595             indexCell.addClass("invisible");
 596         }
 597         if (!showAddress) {
 598             addressCell.addClass("invisible");
 599         }
 600         if (!showPubKey) {
 601             pubkeyCell.addClass("invisible");
 602         }
 603         if (!showPrivKey) {
 604             privkeyCell.addClass("invisible");
 605         }
 606         DOM.addresses.append(row);
 607         var rowShowQrEls = row.find("[data-show-qr]");
 608         setQrEvents(rowShowQrEls);
 609     }
 610
 611     function hasStrongRandom() {
 612         return 'crypto' in window && window['crypto'] !== null;
 613     }
 614
 615     function disableForms() {
 616         $("form").on("submit", function(e) {
 617             e.preventDefault();
 618         });
 619     }
 620
 621     function parseIntNoNaN(val, defaultVal) {
 622         var v = parseInt(val);
 623         if (isNaN(v)) {
 624             return defaultVal;
 625         }
 626         return v;
 627     }
 628
 629     function showPending() {
 630         DOM.feedback
 631             .text("Calculating...")
 632             .show();
 633     }
 634
 635     function findNearestWord(word) {
 636         var language = getLanguage();
 637         var words = WORDLISTS[language];
 638         var minDistance = 99;
 639         var closestWord = words[0];
 640         for (var i=0; i<words.length; i++) {
 641             var comparedTo = words[i];
 642             var distance = Levenshtein.get(word, comparedTo);
 643             if (distance < minDistance) {
 644                 closestWord = comparedTo;
 645                 minDistance = distance;
 646             }
 647         }
 648         return closestWord;
 649     }
 650
 651     function hidePending() {
 652         DOM.feedback
 653             .text("")
 654             .hide();
 655     }
 656
 657     function populateNetworkSelect() {
 658         for (var i=0; i<networks.length; i++) {
 659             var network = networks[i];
 660             var option = $("<option>");
 661             option.attr("value", i);
 662             option.text(network.name);
 663             DOM.phraseNetwork.append(option);
 664         }
 665     }
 666
 667     function getLanguage() {
 668         var defaultLanguage = "english";
 669         // Try to get from existing phrase
 670         var language = getLanguageFromPhrase();
 671         // Try to get from url if not from phrase
 672         if (language.length == 0) {
 673             language = getLanguageFromUrl();
 674         }
 675         // Default to English if no other option
 676         if (language.length == 0) {
 677             language = defaultLanguage;
 678         }
 679         return language;
 680     }
 681
 682     function getLanguageFromPhrase(phrase) {
 683         // Check if how many words from existing phrase match a language.
 684         var language = "";
 685         if (!phrase) {
 686             phrase = DOM.phrase.val();
 687         }
 688         if (phrase.length > 0) {
 689             var words = phraseToWordArray(phrase);
 690             var languageMatches = {};
 691             for (l in WORDLISTS) {
 692                 // Track how many words match in this language
 693                 languageMatches[l] = 0;
 694                 for (var i=0; i<words.length; i++) {
 695                     var wordInLanguage = WORDLISTS[l].indexOf(words[i]) > -1;
 696                     if (wordInLanguage) {
 697                         languageMatches[l]++;
 698                     }
 699                 }
 700                 // Find languages with most word matches.
 701                 // This is made difficult due to commonalities between Chinese
 702                 // simplified vs traditional.
 703                 var mostMatches = 0;
 704                 var mostMatchedLanguages = [];
 705                 for (var l in languageMatches) {
 706                     var numMatches = languageMatches[l];
 707                     if (numMatches > mostMatches) {
 708                         mostMatches = numMatches;
 709                         mostMatchedLanguages = [l];
 710                     }
 711                     else if (numMatches == mostMatches) {
 712                         mostMatchedLanguages.push(l);
 713                     }
 714                 }
 715             }
 716             if (mostMatchedLanguages.length > 0) {
 717                 // Use first language and warn if multiple detected
 718                 language = mostMatchedLanguages[0];
 719                 if (mostMatchedLanguages.length > 1) {
 720                     console.warn("Multiple possible languages");
 721                     console.warn(mostMatchedLanguages);
 722                 }
 723             }
 724         }
 725         return language;
 726     }
 727
 728     function getLanguageFromUrl() {
 729         for (var language in WORDLISTS) {
 730             if (window.location.hash.indexOf(language) > -1) {
 731                 return language;
 732             }
 733         }
 734         return "";
 735     }
 736
 737     function setMnemonicLanguage() {
 738         var language = getLanguage();
 739         // Load the bip39 mnemonic generator for this language if required
 740         if (!(language in mnemonics)) {
 741             mnemonics[language] = new Mnemonic(language);
 742         }
 743         mnemonic = mnemonics[language];
 744     }
 745
 746     function convertPhraseToNewLanguage() {
 747         var oldLanguage = getLanguageFromPhrase();
 748         var newLanguage = getLanguageFromUrl();
 749         var oldPhrase = DOM.phrase.val();
 750         var oldWords = phraseToWordArray(oldPhrase);
 751         var newWords = [];
 752         for (var i=0; i<oldWords.length; i++) {
 753             var oldWord = oldWords[i];
 754             var index = WORDLISTS[oldLanguage].indexOf(oldWord);
 755             var newWord = WORDLISTS[newLanguage][index];
 756             newWords.push(newWord);
 757         }
 758         newPhrase = wordArrayToPhrase(newWords);
 759         return newPhrase;
 760     }
 761
 762     // TODO look at jsbip39 - mnemonic.splitWords
 763     function phraseToWordArray(phrase) {
 764         var words = phrase.split(/\s/g);
 765         var noBlanks = [];
 766         for (var i=0; i<words.length; i++) {
 767             var word = words[i];
 768             if (word.length > 0) {
 769                 noBlanks.push(word);
 770             }
 771         }
 772         return noBlanks;
 773     }
 774
 775     // TODO look at jsbip39 - mnemonic.joinWords
 776     function wordArrayToPhrase(words) {
 777         var phrase = words.join(" ");
 778         var language = getLanguageFromPhrase(phrase);
 779         if (language == "japanese") {
 780             phrase = words.join("\u3000");
 781         }
 782         return phrase;
 783     }
 784
 785     function isUsingOwnEntropy() {
 786         return DOM.useEntropy.prop("checked");
 787     }
 788
 789     function setMnemonicFromEntropy() {
 790         clearEntropyFeedback();
 791         // Get entropy value
 792         var entropyStr = DOM.entropy.val();
 793         // Work out minimum base for entropy
 794         var entropy = Entropy.fromString(entropyStr);
 795         if (entropy.binaryStr.length == 0) {
 796             return;
 797         }
 798         // Show entropy details
 799         showEntropyFeedback(entropy);
 800         // Use entropy hash if not using raw entropy
 801         var bits = entropy.binaryStr;
 802         var mnemonicLength = DOM.entropyMnemonicLength.val();
 803         if (mnemonicLength != "raw") {
 804             // Get bits by hashing entropy with SHA256
 805             var hash = sjcl.hash.sha256.hash(entropy.cleanStr);
 806             var hex = sjcl.codec.hex.fromBits(hash);
 807             bits = BigInteger.parse(hex, 16).toString(2);
 808             for (var i=0; i<256-bits.length; i++) {
 809                 bits = "0" + bits;
 810             }
 811             // Truncate hash to suit number of words
 812             mnemonicLength = parseInt(mnemonicLength);
 813             var numberOfBits = 32 * mnemonicLength / 3;
 814             bits = bits.substring(0, numberOfBits);
 815         }
 816         // Discard trailing entropy
 817         var bitsToUse = Math.floor(bits.length / 32) * 32;
 818         var start = bits.length - bitsToUse;
 819         var binaryStr = bits.substring(start);
 820         // Convert entropy string to numeric array
 821         var entropyArr = [];
 822         for (var i=0; i<binaryStr.length / 8; i++) {
 823             var byteAsBits = binaryStr.substring(i*8, i*8+8);
 824             var entropyByte = parseInt(byteAsBits, 2);
 825             entropyArr.push(entropyByte)
 826         }
 827         // Convert entropy array to mnemonic
 828         var phrase = mnemonic.toMnemonic(entropyArr);
 829         // Set the mnemonic in the UI
 830         DOM.phrase.val(phrase);
 831     }
 832
 833     function clearEntropyFeedback() {
 834         DOM.entropyStrength.text("...");
 835         DOM.entropyType.text("");
 836         DOM.entropyWordCount.text("0");
 837         DOM.entropyEventCount.text("0");
 838         DOM.entropyBitsPerEvent.text("0");
 839         DOM.entropyBits.text("0");
 840         DOM.entropyFiltered.html("&nbsp;");
 841         DOM.entropyBinary.html("&nbsp;");
 842     }
 843
 844     function showEntropyFeedback(entropy) {
 845         var numberOfBits = entropy.binaryStr.length;
 846         var strength = "extremely weak";
 847         if (numberOfBits >= 64) {
 848             strength = "very weak";
 849         }
 850         if (numberOfBits >= 96) {
 851             strength = "weak";
 852         }
 853         if (numberOfBits >= 128) {
 854             strength = "strong";
 855         }
 856         if (numberOfBits >= 160) {
 857             strength = "very strong";
 858         }
 859         if (numberOfBits >= 192) {
 860             strength = "extremely strong";
 861         }
 862         // If time to crack is less than one day, and password is considered
 863         // strong or better based on the number of bits, rename strength to
 864         // 'easily cracked'.
 865         try {
 866             var z = zxcvbn(entropy.base.parts.join(""));
 867             var timeToCrack = z.crack_times_seconds.offline_fast_hashing_1e10_per_second;
 868             if (timeToCrack < 86400 && entropy.binaryStr.length >= 128) {
 869                 strength = "easily cracked";
 870                 if (z.feedback.warning != "") {
 871                     strength = strength + " - " + z.feedback.warning;
 872                 };
 873             }
 874         }
 875         catch (e) {
 876             strength = "unknown";
 877             console.log("Error detecting entropy strength with zxcvbn:");
 878             console.log(e);
 879         }
 880         var entropyTypeStr = getEntropyTypeStr(entropy);
 881         var wordCount = Math.floor(numberOfBits / 32) * 3;
 882         var bitsPerEvent = entropy.bitsPerEvent.toFixed(2);
 883         DOM.entropyFiltered.html(entropy.cleanHtml);
 884         DOM.entropyType.text(entropyTypeStr);
 885         DOM.entropyStrength.text(strength);
 886         DOM.entropyEventCount.text(entropy.base.ints.length);
 887         DOM.entropyBits.text(numberOfBits);
 888         DOM.entropyWordCount.text(wordCount);
 889         DOM.entropyBinary.text(entropy.binaryStr);
 890         DOM.entropyBitsPerEvent.text(bitsPerEvent);
 891     }
 892
 893     function getEntropyTypeStr(entropy) {
 894         var typeStr = entropy.base.str;
 895         // Add some detail if these are cards
 896         if (entropy.base.asInt == 52) {
 897             var cardDetail = []; // array of message strings
 898             // Detect duplicates
 899             var dupes = [];
 900             var dupeTracker = {};
 901             for (var i=0; i<entropy.base.parts.length; i++) {
 902                 var card = entropy.base.parts[i];
 903                 var cardUpper = card.toUpperCase();
 904                 if (cardUpper in dupeTracker) {
 905                     dupes.push(card);
 906                 }
 907                 dupeTracker[cardUpper] = true;
 908             }
 909             if (dupes.length > 0) {
 910                 var dupeWord = "duplicates";
 911                 if (dupes.length == 1) {
 912                     dupeWord = "duplicate";
 913                 }
 914                 var msg = dupes.length + " " + dupeWord + ": " + dupes.slice(0,3).join(" ");
 915                 if (dupes.length > 3) {
 916                     msg += "...";
 917                 }
 918                 cardDetail.push(msg);
 919             }
 920             // Detect full deck
 921             var uniqueCards = [];
 922             for (var uniqueCard in dupeTracker) {
 923                 uniqueCards.push(uniqueCard);
 924             }
 925             if (uniqueCards.length == 52) {
 926                 cardDetail.unshift("full deck");
 927             }
 928             // Detect missing cards
 929             var values = "A23456789TJQK";
 930             var suits = "CDHS";
 931             var missingCards = [];
 932             for (var i=0; i<suits.length; i++) {
 933                 for (var j=0; j<values.length; j++) {
 934                     var card = values[j] + suits[i];
 935                     if (!(card in dupeTracker)) {
 936                         missingCards.push(card);
 937                     }
 938                 }
 939             }
 940             // Display missing cards if six or less, ie clearly going for full deck
 941             if (missingCards.length > 0 && missingCards.length <= 6) {
 942                 var msg = missingCards.length + " missing: " + missingCards.slice(0,3).join(" ");
 943                 if (missingCards.length > 3) {
 944                     msg += "...";
 945                 }
 946                 cardDetail.push(msg);
 947             }
 948             // Add card details to typeStr
 949             if (cardDetail.length > 0) {
 950                 typeStr += " (" + cardDetail.join(", ") + ")";
 951             }
 952         }
 953         return typeStr;
 954     }
 955
 956     function setQrEvents(els) {
 957         els.on("mouseenter", createQr);
 958         els.on("mouseleave", destroyQr);
 959         els.on("click", toggleQr);
 960     }
 961
 962     function createQr(e) {
 963         var content = e.target.textContent || e.target.value;
 964         if (content) {
 965             var size = 130;
 966             DOM.qrImage.qrcode({width: size, height: size, text: content});
 967             if (!showQr) {
 968                 DOM.qrHider.addClass("hidden");
 969             }
 970             else {
 971                 DOM.qrHider.removeClass("hidden");
 972             }
 973             DOM.qrContainer.removeClass("hidden");
 974         }
 975     }
 976
 977     function destroyQr() {
 978         DOM.qrImage.text("");
 979         DOM.qrContainer.addClass("hidden");
 980     }
 981
 982     function toggleQr() {
 983         showQr = !showQr;
 984         DOM.qrHider.toggleClass("hidden");
 985         DOM.qrHint.toggleClass("hidden");
 986     }
 987
 988     function bip44TabSelected() {
 989         return DOM.bip44tab.hasClass("active");
 990     }
 991
 992     function bip32TabSelected() {
 993         return DOM.bip32tab.hasClass("active");
 994     }
 995
 996     var networks = [
 997         {
 998             name: "Bitcoin",
 999             onSelect: function() {
1000                 network = bitcoin.networks.bitcoin;
1001                 DOM.bip44coin.val(0);
1002             },
1003         },
1004         {
1005             name: "Bitcoin Testnet",
1006             onSelect: function() {
1007                 network = bitcoin.networks.testnet;
1008                 DOM.bip44coin.val(1);
1009             },
1010         },
1011         {
1012             name: "Litecoin",
1013             onSelect: function() {
1014                 network = bitcoin.networks.litecoin;
1015                 DOM.bip44coin.val(2);
1016             },
1017         },
1018         {
1019             name: "Dogecoin",
1020             onSelect: function() {
1021                 network = bitcoin.networks.dogecoin;
1022                 DOM.bip44coin.val(3);
1023             },
1024         },
1025         {
1026             name: "ShadowCash",
1027             onSelect: function() {
1028                 network = bitcoin.networks.shadow;
1029                 DOM.bip44coin.val(35);
1030             },
1031         },
1032         {
1033             name: "ShadowCash Testnet",
1034             onSelect: function() {
1035                 network = bitcoin.networks.shadowtn;
1036                 DOM.bip44coin.val(1);
1037             },
1038         },
1039         {
1040             name: "Viacoin",
1041             onSelect: function() {
1042                 network = bitcoin.networks.viacoin;
1043                 DOM.bip44coin.val(14);
1044             },
1045         },
1046         {
1047             name: "Viacoin Testnet",
1048             onSelect: function() {
1049                 network = bitcoin.networks.viacointestnet;
1050                 DOM.bip44coin.val(1);
1051             },
1052         },
1053         {
1054             name: "Jumbucks",
1055             onSelect: function() {
1056                 network = bitcoin.networks.jumbucks;
1057                 DOM.bip44coin.val(26);
1058             },
1059         },
1060         {
1061             name: "CLAM",
1062             onSelect: function() {
1063                 network = bitcoin.networks.clam;
1064                 DOM.bip44coin.val(23);
1065             },
1066         },
1067         {
1068             name: "DASH",
1069             onSelect: function() {
1070                 network = bitcoin.networks.dash;
1071                 DOM.bip44coin.val(5);
1072             },
1073         },
1074         {
1075             name: "Namecoin",
1076             onSelect: function() {
1077                 network = bitcoin.networks.namecoin;
1078                 DOM.bip44coin.val(7);
1079             },
1080         },
1081         {
1082             name: "Peercoin",
1083             onSelect: function() {
1084                 network = bitcoin.networks.peercoin;
1085                 DOM.bip44coin.val(6);
1086             },
1087         },
1088     ]
1089
1090     init();
1091
1092 })();