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         // Check there's a root key to derive from
 328         if (!bip32RootKey) {
 329             return bip32RootKey;
 330         }
 331         var extendedKey = bip32RootKey;
 332         // Derive the key from the path
 333         var pathBits = path.split("/");
 334         for (var i=0; i<pathBits.length; i++) {
 335             var bit = pathBits[i];
 336             var index = parseInt(bit);
 337             if (isNaN(index)) {
 338                 continue;
 339             }
 340             var hardened = bit[bit.length-1] == "'";
 341             var isPriv = "privKey" in extendedKey;
 342             var invalidDerivationPath = hardened && !isPriv;
 343             if (invalidDerivationPath) {
 344                 extendedKey = null;
 345             }
 346             else if (hardened) {
 347                 extendedKey = extendedKey.deriveHardened(index);
 348             }
 349             else {
 350                 extendedKey = extendedKey.derive(index);
 351             }
 352         }
 353         return extendedKey
 354     }
 355
 356     function showValidationError(errorText) {
 357         DOM.feedback
 358             .text(errorText)
 359             .show();
 360     }
 361
 362     function hideValidationError() {
 363         DOM.feedback
 364             .text("")
 365             .hide();
 366     }
 367
 368     function findPhraseErrors(phrase) {
 369         // Preprocess the words
 370         phrase = mnemonic.normalizeString(phrase);
 371         var words = phraseToWordArray(phrase);
 372         // Detect blank phrase
 373         if (words.length == 0) {
 374             return "Blank mnemonic";
 375         }
 376         // Check each word
 377         for (var i=0; i<words.length; i++) {
 378             var word = words[i];
 379             var language = getLanguage();
 380             if (WORDLISTS[language].indexOf(word) == -1) {
 381                 console.log("Finding closest match to " + word);
 382                 var nearestWord = findNearestWord(word);
 383                 return word + " not in wordlist, did you mean " + nearestWord + "?";
 384             }
 385         }
 386         // Check the words are valid
 387         var properPhrase = wordArrayToPhrase(words);
 388         var isValid = mnemonic.check(properPhrase);
 389         if (!isValid) {
 390             return "Invalid mnemonic";
 391         }
 392         return false;
 393     }
 394
 395     function validateRootKey(rootKeyBase58) {
 396         try {
 397             bitcoin.HDNode.fromBase58(rootKeyBase58);
 398         }
 399         catch (e) {
 400             return "Invalid root key";
 401         }
 402         return "";
 403     }
 404
 405     function getDerivationPath() {
 406         if (bip44TabSelected()) {
 407             var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);
 408             var coin = parseIntNoNaN(DOM.bip44coin.val(), 0);
 409             var account = parseIntNoNaN(DOM.bip44account.val(), 0);
 410             var change = parseIntNoNaN(DOM.bip44change.val(), 0);
 411             var path = "m/";
 412             path += purpose + "'/";
 413             path += coin + "'/";
 414             path += account + "'/";
 415             path += change;
 416             DOM.bip44path.val(path);
 417             var derivationPath = DOM.bip44path.val();
 418             console.log("Using derivation path from BIP44 tab: " + derivationPath);
 419             return derivationPath;
 420         }
 421         else if (bip32TabSelected()) {
 422             var derivationPath = DOM.bip32path.val();
 423             console.log("Using derivation path from BIP32 tab: " + derivationPath);
 424             return derivationPath;
 425         }
 426         else {
 427             console.log("Unknown derivation path");
 428         }
 429     }
 430
 431     function findDerivationPathErrors(path) {
 432         // TODO is not perfect but is better than nothing
 433         // Inspired by
 434         // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#test-vectors
 435         // and
 436         // https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#extended-keys
 437         var maxDepth = 255; // TODO verify this!!
 438         var maxIndexValue = Math.pow(2, 31); // TODO verify this!!
 439         if (path[0] != "m") {
 440             return "First character must be 'm'";
 441         }
 442         if (path.length > 1) {
 443             if (path[1] != "/") {
 444                 return "Separator must be '/'";
 445             }
 446             var indexes = path.split("/");
 447             if (indexes.length > maxDepth) {
 448                 return "Derivation depth is " + indexes.length + ", must be less than " + maxDepth;
 449             }
 450             for (var depth = 1; depth<indexes.length; depth++) {
 451                 var index = indexes[depth];
 452                 var invalidChars = index.replace(/^[0-9]+'?$/g, "")
 453                 if (invalidChars.length > 0) {
 454                     return "Invalid characters " + invalidChars + " found at depth " + depth;
 455                 }
 456                 var indexValue = parseInt(index.replace("'", ""));
 457                 if (isNaN(depth)) {
 458                     return "Invalid number at depth " + depth;
 459                 }
 460                 if (indexValue > maxIndexValue) {
 461                     return "Value of " + indexValue + " at depth " + depth + " must be less than " + maxIndexValue;
 462                 }
 463             }
 464         }
 465         // Check root key exists or else derivation path is useless!
 466         if (!bip32RootKey) {
 467             return "No root key";
 468         }
 469         // Check no hardened derivation path when using xpub keys
 470         var hardened = path.indexOf("'") > -1;
 471         var isXpubkey = !("privKey" in bip32RootKey);
 472         if (hardened && isXpubkey) {
 473             return "Hardened derivation path is invalid with xpub key";
 474         }
 475         return false;
 476     }
 477
 478     function displayBip44Info() {
 479         // Get the derivation path for the account
 480         var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);
 481         var coin = parseIntNoNaN(DOM.bip44coin.val(), 0);
 482         var account = parseIntNoNaN(DOM.bip44account.val(), 0);
 483         var path = "m/";
 484         path += purpose + "'/";
 485         path += coin + "'/";
 486         path += account + "'/";
 487         // Calculate the account extended keys
 488         var accountExtendedKey = calcBip32ExtendedKey(path);
 489         var accountXprv = accountExtendedKey.toBase58();
 490         var accountXpub = accountExtendedKey.toBase58(false);
 491         // Display the extended keys
 492         DOM.bip44accountXprv.val(accountXprv);
 493         DOM.bip44accountXpub.val(accountXpub);
 494     }
 495
 496     function displayBip32Info() {
 497         // Display the key
 498         DOM.seed.val(seed);
 499         var rootKey = bip32RootKey.toBase58();
 500         DOM.rootKey.val(rootKey);
 501         var xprvkeyB58 = "NA";
 502         if (bip32ExtendedKey.privKey) {
 503             xprvkeyB58 = bip32ExtendedKey.toBase58();
 504         }
 505         var extendedPrivKey = xprvkeyB58;
 506         DOM.extendedPrivKey.val(extendedPrivKey);
 507         var extendedPubKey = bip32ExtendedKey.toBase58(false);
 508         DOM.extendedPubKey.val(extendedPubKey);
 509         // Display the addresses and privkeys
 510         clearAddressesList();
 511         displayAddresses(0, 20);
 512     }
 513
 514     function displayAddresses(start, total) {
 515         for (var i=0; i<total; i++) {
 516             var index = i + start;
 517             new TableRow(index);
 518         }
 519     }
 520
 521     function TableRow(index) {
 522
 523         var useHardenedAddresses = DOM.hardenedAddresses.prop("checked");
 524
 525         function init() {
 526             calculateValues();
 527         }
 528
 529         function calculateValues() {
 530             setTimeout(function() {
 531                 var key = "";
 532                 if (useHardenedAddresses) {
 533                     key = bip32ExtendedKey.deriveHardened(index);
 534                 }
 535                 else {
 536                     key = bip32ExtendedKey.derive(index);
 537                 }
 538                 var address = key.getAddress().toString();
 539                 var privkey = "NA";
 540                 if (key.privKey) {
 541                     privkey = key.privKey.toWIF(network);
 542                 }
 543                 var pubkey = key.pubKey.toHex();
 544                 var indexText = getDerivationPath() + "/" + index;
 545                 if (useHardenedAddresses) {
 546                     indexText = indexText + "'";
 547                 }
 548                 addAddressToList(indexText, address, pubkey, privkey);
 549             }, 50)
 550         }
 551
 552         init();
 553
 554     }
 555
 556     function showMore() {
 557         var start = DOM.addresses.children().length;
 558         var rowsToAdd = parseInt(DOM.rowsToAdd.val());
 559         if (isNaN(rowsToAdd)) {
 560             rowsToAdd = 20;
 561             DOM.rowsToAdd.val("20");
 562         }
 563         if (rowsToAdd > 200) {
 564             var msg = "Generating " + rowsToAdd + " rows could take a while. ";
 565             msg += "Do you want to continue?";
 566             if (!confirm(msg)) {
 567                 return;
 568             }
 569         }
 570         displayAddresses(start, rowsToAdd);
 571     }
 572
 573     function clearDisplay() {
 574         clearAddressesList();
 575         clearKey();
 576         hideValidationError();
 577     }
 578
 579     function clearAddressesList() {
 580         DOM.addresses.empty();
 581     }
 582
 583     function clearKey() {
 584         DOM.rootKey.val("");
 585         DOM.extendedPrivKey.val("");
 586         DOM.extendedPubKey.val("");
 587     }
 588
 589     function addAddressToList(indexText, address, pubkey, privkey) {
 590         var row = $(addressRowTemplate.html());
 591         // Elements
 592         var indexCell = row.find(".index span");
 593         var addressCell = row.find(".address span");
 594         var pubkeyCell = row.find(".pubkey span");
 595         var privkeyCell = row.find(".privkey span");
 596         // Content
 597         indexCell.text(indexText);
 598         addressCell.text(address);
 599         pubkeyCell.text(pubkey);
 600         privkeyCell.text(privkey);
 601         // Visibility
 602         if (!showIndex) {
 603             indexCell.addClass("invisible");
 604         }
 605         if (!showAddress) {
 606             addressCell.addClass("invisible");
 607         }
 608         if (!showPubKey) {
 609             pubkeyCell.addClass("invisible");
 610         }
 611         if (!showPrivKey) {
 612             privkeyCell.addClass("invisible");
 613         }
 614         DOM.addresses.append(row);
 615         var rowShowQrEls = row.find("[data-show-qr]");
 616         setQrEvents(rowShowQrEls);
 617     }
 618
 619     function hasStrongRandom() {
 620         return 'crypto' in window && window['crypto'] !== null;
 621     }
 622
 623     function disableForms() {
 624         $("form").on("submit", function(e) {
 625             e.preventDefault();
 626         });
 627     }
 628
 629     function parseIntNoNaN(val, defaultVal) {
 630         var v = parseInt(val);
 631         if (isNaN(v)) {
 632             return defaultVal;
 633         }
 634         return v;
 635     }
 636
 637     function showPending() {
 638         DOM.feedback
 639             .text("Calculating...")
 640             .show();
 641     }
 642
 643     function findNearestWord(word) {
 644         var language = getLanguage();
 645         var words = WORDLISTS[language];
 646         var minDistance = 99;
 647         var closestWord = words[0];
 648         for (var i=0; i<words.length; i++) {
 649             var comparedTo = words[i];
 650             if (comparedTo.indexOf(word) == 0) {
 651                 return comparedTo;
 652             }
 653             var distance = Levenshtein.get(word, comparedTo);
 654             if (distance < minDistance) {
 655                 closestWord = comparedTo;
 656                 minDistance = distance;
 657             }
 658         }
 659         return closestWord;
 660     }
 661
 662     function hidePending() {
 663         DOM.feedback
 664             .text("")
 665             .hide();
 666     }
 667
 668     function populateNetworkSelect() {
 669         for (var i=0; i<networks.length; i++) {
 670             var network = networks[i];
 671             var option = $("<option>");
 672             option.attr("value", i);
 673             option.text(network.name);
 674             DOM.phraseNetwork.append(option);
 675         }
 676     }
 677
 678     function getLanguage() {
 679         var defaultLanguage = "english";
 680         // Try to get from existing phrase
 681         var language = getLanguageFromPhrase();
 682         // Try to get from url if not from phrase
 683         if (language.length == 0) {
 684             language = getLanguageFromUrl();
 685         }
 686         // Default to English if no other option
 687         if (language.length == 0) {
 688             language = defaultLanguage;
 689         }
 690         return language;
 691     }
 692
 693     function getLanguageFromPhrase(phrase) {
 694         // Check if how many words from existing phrase match a language.
 695         var language = "";
 696         if (!phrase) {
 697             phrase = DOM.phrase.val();
 698         }
 699         if (phrase.length > 0) {
 700             var words = phraseToWordArray(phrase);
 701             var languageMatches = {};
 702             for (l in WORDLISTS) {
 703                 // Track how many words match in this language
 704                 languageMatches[l] = 0;
 705                 for (var i=0; i<words.length; i++) {
 706                     var wordInLanguage = WORDLISTS[l].indexOf(words[i]) > -1;
 707                     if (wordInLanguage) {
 708                         languageMatches[l]++;
 709                     }
 710                 }
 711                 // Find languages with most word matches.
 712                 // This is made difficult due to commonalities between Chinese
 713                 // simplified vs traditional.
 714                 var mostMatches = 0;
 715                 var mostMatchedLanguages = [];
 716                 for (var l in languageMatches) {
 717                     var numMatches = languageMatches[l];
 718                     if (numMatches > mostMatches) {
 719                         mostMatches = numMatches;
 720                         mostMatchedLanguages = [l];
 721                     }
 722                     else if (numMatches == mostMatches) {
 723                         mostMatchedLanguages.push(l);
 724                     }
 725                 }
 726             }
 727             if (mostMatchedLanguages.length > 0) {
 728                 // Use first language and warn if multiple detected
 729                 language = mostMatchedLanguages[0];
 730                 if (mostMatchedLanguages.length > 1) {
 731                     console.warn("Multiple possible languages");
 732                     console.warn(mostMatchedLanguages);
 733                 }
 734             }
 735         }
 736         return language;
 737     }
 738
 739     function getLanguageFromUrl() {
 740         for (var language in WORDLISTS) {
 741             if (window.location.hash.indexOf(language) > -1) {
 742                 return language;
 743             }
 744         }
 745         return "";
 746     }
 747
 748     function setMnemonicLanguage() {
 749         var language = getLanguage();
 750         // Load the bip39 mnemonic generator for this language if required
 751         if (!(language in mnemonics)) {
 752             mnemonics[language] = new Mnemonic(language);
 753         }
 754         mnemonic = mnemonics[language];
 755     }
 756
 757     function convertPhraseToNewLanguage() {
 758         var oldLanguage = getLanguageFromPhrase();
 759         var newLanguage = getLanguageFromUrl();
 760         var oldPhrase = DOM.phrase.val();
 761         var oldWords = phraseToWordArray(oldPhrase);
 762         var newWords = [];
 763         for (var i=0; i<oldWords.length; i++) {
 764             var oldWord = oldWords[i];
 765             var index = WORDLISTS[oldLanguage].indexOf(oldWord);
 766             var newWord = WORDLISTS[newLanguage][index];
 767             newWords.push(newWord);
 768         }
 769         newPhrase = wordArrayToPhrase(newWords);
 770         return newPhrase;
 771     }
 772
 773     // TODO look at jsbip39 - mnemonic.splitWords
 774     function phraseToWordArray(phrase) {
 775         var words = phrase.split(/\s/g);
 776         var noBlanks = [];
 777         for (var i=0; i<words.length; i++) {
 778             var word = words[i];
 779             if (word.length > 0) {
 780                 noBlanks.push(word);
 781             }
 782         }
 783         return noBlanks;
 784     }
 785
 786     // TODO look at jsbip39 - mnemonic.joinWords
 787     function wordArrayToPhrase(words) {
 788         var phrase = words.join(" ");
 789         var language = getLanguageFromPhrase(phrase);
 790         if (language == "japanese") {
 791             phrase = words.join("\u3000");
 792         }
 793         return phrase;
 794     }
 795
 796     function isUsingOwnEntropy() {
 797         return DOM.useEntropy.prop("checked");
 798     }
 799
 800     function setMnemonicFromEntropy() {
 801         clearEntropyFeedback();
 802         // Get entropy value
 803         var entropyStr = DOM.entropy.val();
 804         // Work out minimum base for entropy
 805         var entropy = Entropy.fromString(entropyStr);
 806         if (entropy.binaryStr.length == 0) {
 807             return;
 808         }
 809         // Show entropy details
 810         showEntropyFeedback(entropy);
 811         // Use entropy hash if not using raw entropy
 812         var bits = entropy.binaryStr;
 813         var mnemonicLength = DOM.entropyMnemonicLength.val();
 814         if (mnemonicLength != "raw") {
 815             // Get bits by hashing entropy with SHA256
 816             var hash = sjcl.hash.sha256.hash(entropy.cleanStr);
 817             var hex = sjcl.codec.hex.fromBits(hash);
 818             bits = BigInteger.parse(hex, 16).toString(2);
 819             for (var i=0; i<256-bits.length; i++) {
 820                 bits = "0" + bits;
 821             }
 822             // Truncate hash to suit number of words
 823             mnemonicLength = parseInt(mnemonicLength);
 824             var numberOfBits = 32 * mnemonicLength / 3;
 825             bits = bits.substring(0, numberOfBits);
 826         }
 827         // Discard trailing entropy
 828         var bitsToUse = Math.floor(bits.length / 32) * 32;
 829         var start = bits.length - bitsToUse;
 830         var binaryStr = bits.substring(start);
 831         // Convert entropy string to numeric array
 832         var entropyArr = [];
 833         for (var i=0; i<binaryStr.length / 8; i++) {
 834             var byteAsBits = binaryStr.substring(i*8, i*8+8);
 835             var entropyByte = parseInt(byteAsBits, 2);
 836             entropyArr.push(entropyByte)
 837         }
 838         // Convert entropy array to mnemonic
 839         var phrase = mnemonic.toMnemonic(entropyArr);
 840         // Set the mnemonic in the UI
 841         DOM.phrase.val(phrase);
 842     }
 843
 844     function clearEntropyFeedback() {
 845         DOM.entropyStrength.text("...");
 846         DOM.entropyType.text("");
 847         DOM.entropyWordCount.text("0");
 848         DOM.entropyEventCount.text("0");
 849         DOM.entropyBitsPerEvent.text("0");
 850         DOM.entropyBits.text("0");
 851         DOM.entropyFiltered.html("&nbsp;");
 852         DOM.entropyBinary.html("&nbsp;");
 853     }
 854
 855     function showEntropyFeedback(entropy) {
 856         var numberOfBits = entropy.binaryStr.length;
 857         var strength = "extremely weak";
 858         if (numberOfBits >= 64) {
 859             strength = "very weak";
 860         }
 861         if (numberOfBits >= 96) {
 862             strength = "weak";
 863         }
 864         if (numberOfBits >= 128) {
 865             strength = "strong";
 866         }
 867         if (numberOfBits >= 160) {
 868             strength = "very strong";
 869         }
 870         if (numberOfBits >= 192) {
 871             strength = "extremely strong";
 872         }
 873         // If time to crack is less than one day, and password is considered
 874         // strong or better based on the number of bits, rename strength to
 875         // 'easily cracked'.
 876         try {
 877             var z = zxcvbn(entropy.base.parts.join(""));
 878             var timeToCrack = z.crack_times_seconds.offline_fast_hashing_1e10_per_second;
 879             if (timeToCrack < 86400 && entropy.binaryStr.length >= 128) {
 880                 strength = "easily cracked";
 881                 if (z.feedback.warning != "") {
 882                     strength = strength + " - " + z.feedback.warning;
 883                 };
 884             }
 885         }
 886         catch (e) {
 887             strength = "unknown";
 888             console.log("Error detecting entropy strength with zxcvbn:");
 889             console.log(e);
 890         }
 891         var entropyTypeStr = getEntropyTypeStr(entropy);
 892         var wordCount = Math.floor(numberOfBits / 32) * 3;
 893         var bitsPerEvent = entropy.bitsPerEvent.toFixed(2);
 894         DOM.entropyFiltered.html(entropy.cleanHtml);
 895         DOM.entropyType.text(entropyTypeStr);
 896         DOM.entropyStrength.text(strength);
 897         DOM.entropyEventCount.text(entropy.base.ints.length);
 898         DOM.entropyBits.text(numberOfBits);
 899         DOM.entropyWordCount.text(wordCount);
 900         DOM.entropyBinary.text(entropy.binaryStr);
 901         DOM.entropyBitsPerEvent.text(bitsPerEvent);
 902     }
 903
 904     function getEntropyTypeStr(entropy) {
 905         var typeStr = entropy.base.str;
 906         // Add some detail if these are cards
 907         if (entropy.base.asInt == 52) {
 908             var cardDetail = []; // array of message strings
 909             // Detect duplicates
 910             var dupes = [];
 911             var dupeTracker = {};
 912             for (var i=0; i<entropy.base.parts.length; i++) {
 913                 var card = entropy.base.parts[i];
 914                 var cardUpper = card.toUpperCase();
 915                 if (cardUpper in dupeTracker) {
 916                     dupes.push(card);
 917                 }
 918                 dupeTracker[cardUpper] = true;
 919             }
 920             if (dupes.length > 0) {
 921                 var dupeWord = "duplicates";
 922                 if (dupes.length == 1) {
 923                     dupeWord = "duplicate";
 924                 }
 925                 var msg = dupes.length + " " + dupeWord + ": " + dupes.slice(0,3).join(" ");
 926                 if (dupes.length > 3) {
 927                     msg += "...";
 928                 }
 929                 cardDetail.push(msg);
 930             }
 931             // Detect full deck
 932             var uniqueCards = [];
 933             for (var uniqueCard in dupeTracker) {
 934                 uniqueCards.push(uniqueCard);
 935             }
 936             if (uniqueCards.length == 52) {
 937                 cardDetail.unshift("full deck");
 938             }
 939             // Detect missing cards
 940             var values = "A23456789TJQK";
 941             var suits = "CDHS";
 942             var missingCards = [];
 943             for (var i=0; i<suits.length; i++) {
 944                 for (var j=0; j<values.length; j++) {
 945                     var card = values[j] + suits[i];
 946                     if (!(card in dupeTracker)) {
 947                         missingCards.push(card);
 948                     }
 949                 }
 950             }
 951             // Display missing cards if six or less, ie clearly going for full deck
 952             if (missingCards.length > 0 && missingCards.length <= 6) {
 953                 var msg = missingCards.length + " missing: " + missingCards.slice(0,3).join(" ");
 954                 if (missingCards.length > 3) {
 955                     msg += "...";
 956                 }
 957                 cardDetail.push(msg);
 958             }
 959             // Add card details to typeStr
 960             if (cardDetail.length > 0) {
 961                 typeStr += " (" + cardDetail.join(", ") + ")";
 962             }
 963         }
 964         return typeStr;
 965     }
 966
 967     function setQrEvents(els) {
 968         els.on("mouseenter", createQr);
 969         els.on("mouseleave", destroyQr);
 970         els.on("click", toggleQr);
 971     }
 972
 973     function createQr(e) {
 974         var content = e.target.textContent || e.target.value;
 975         if (content) {
 976             var size = 130;
 977             DOM.qrImage.qrcode({width: size, height: size, text: content});
 978             if (!showQr) {
 979                 DOM.qrHider.addClass("hidden");
 980             }
 981             else {
 982                 DOM.qrHider.removeClass("hidden");
 983             }
 984             DOM.qrContainer.removeClass("hidden");
 985         }
 986     }
 987
 988     function destroyQr() {
 989         DOM.qrImage.text("");
 990         DOM.qrContainer.addClass("hidden");
 991     }
 992
 993     function toggleQr() {
 994         showQr = !showQr;
 995         DOM.qrHider.toggleClass("hidden");
 996         DOM.qrHint.toggleClass("hidden");
 997     }
 998
 999     function bip44TabSelected() {
1000         return DOM.bip44tab.hasClass("active");
1001     }
1002
1003     function bip32TabSelected() {
1004         return DOM.bip32tab.hasClass("active");
1005     }
1006
1007     var networks = [
1008         {
1009             name: "Bitcoin",
1010             onSelect: function() {
1011                 network = bitcoin.networks.bitcoin;
1012                 DOM.bip44coin.val(0);
1013             },
1014         },
1015         {
1016             name: "Bitcoin Testnet",
1017             onSelect: function() {
1018                 network = bitcoin.networks.testnet;
1019                 DOM.bip44coin.val(1);
1020             },
1021         },
1022         {
1023             name: "Litecoin",
1024             onSelect: function() {
1025                 network = bitcoin.networks.litecoin;
1026                 DOM.bip44coin.val(2);
1027             },
1028         },
1029         {
1030             name: "Dogecoin",
1031             onSelect: function() {
1032                 network = bitcoin.networks.dogecoin;
1033                 DOM.bip44coin.val(3);
1034             },
1035         },
1036         {
1037             name: "ShadowCash",
1038             onSelect: function() {
1039                 network = bitcoin.networks.shadow;
1040                 DOM.bip44coin.val(35);
1041             },
1042         },
1043         {
1044             name: "ShadowCash Testnet",
1045             onSelect: function() {
1046                 network = bitcoin.networks.shadowtn;
1047                 DOM.bip44coin.val(1);
1048             },
1049         },
1050         {
1051             name: "Viacoin",
1052             onSelect: function() {
1053                 network = bitcoin.networks.viacoin;
1054                 DOM.bip44coin.val(14);
1055             },
1056         },
1057         {
1058             name: "Viacoin Testnet",
1059             onSelect: function() {
1060                 network = bitcoin.networks.viacointestnet;
1061                 DOM.bip44coin.val(1);
1062             },
1063         },
1064         {
1065             name: "Jumbucks",
1066             onSelect: function() {
1067                 network = bitcoin.networks.jumbucks;
1068                 DOM.bip44coin.val(26);
1069             },
1070         },
1071         {
1072             name: "CLAM",
1073             onSelect: function() {
1074                 network = bitcoin.networks.clam;
1075                 DOM.bip44coin.val(23);
1076             },
1077         },
1078         {
1079             name: "DASH",
1080             onSelect: function() {
1081                 network = bitcoin.networks.dash;
1082                 DOM.bip44coin.val(5);
1083             },
1084         },
1085         {
1086             name: "Namecoin",
1087             onSelect: function() {
1088                 network = bitcoin.networks.namecoin;
1089                 DOM.bip44coin.val(7);
1090             },
1091         },
1092         {
1093             name: "Peercoin",
1094             onSelect: function() {
1095                 network = bitcoin.networks.peercoin;
1096                 DOM.bip44coin.val(6);
1097             },
1098         },
1099     ]
1100
1101     init();
1102
1103 })();