BIP32 Root Key can be specified by user

2 files changed, 75 insertions, 12 deletions

diff --git a/src/index.html b/src/index.html
index 6708675..fcdf109 100644
--- a/src/index.html
+++ b/src/index.html
@@ -105,7 +105,7 @@
                         <div class="form-group">
                             <label for="root-key" class="col-sm-2 control-label">BIP32 Root Key</label>
                             <div class="col-sm-10">
-                                <textarea id="root-key" class="root-key form-control" readonly="readonly"></textarea>
+                                <textarea id="root-key" class="root-key form-control"></textarea>
                             </div>
                         </div>
                     </form>
diff --git a/src/js/index.js b/src/js/index.js
index f3582b0..88e891c 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -12,6 +12,7 @@
     var showPrivKey = true;
 
     var phraseChangeTimeoutEvent = null;
+    var rootKeyChangedTimeoutEvent = null;
 
     var DOM = {};
     DOM.network = $(".network");
@@ -50,12 +51,13 @@
         DOM.passphrase.on("input", delayedPhraseChanged);
         DOM.generate.on("click", generateClicked);
         DOM.more.on("click", showMore);
-        DOM.bip32path.on("input", delayedPhraseChanged);
-        DOM.bip44purpose.on("input", delayedPhraseChanged);
-        DOM.bip44coin.on("input", delayedPhraseChanged);
-        DOM.bip44account.on("input", delayedPhraseChanged);
-        DOM.bip44change.on("input", delayedPhraseChanged);
-        DOM.tab.on("click", delayedPhraseChanged);
+        DOM.rootKey.on("input", delayedRootKeyChanged);
+        DOM.bip32path.on("input", calcForDerivationPath);
+        DOM.bip44purpose.on("input", calcForDerivationPath);
+        DOM.bip44coin.on("input", calcForDerivationPath);
+        DOM.bip44account.on("input", calcForDerivationPath);
+        DOM.bip44change.on("input", calcForDerivationPath);
+        DOM.tab.on("shown.bs.tab", calcForDerivationPath);
         DOM.indexToggle.on("click", toggleIndexes);
         DOM.addressToggle.on("click", toggleAddresses);
         DOM.privateKeyToggle.on("click", togglePrivateKeys);
@@ -70,7 +72,7 @@
     function networkChanged(e) {
         var network = e.target.value;
         networks[network].onSelect();
-        delayedPhraseChanged();
+        displayBip32Info();
     }
 
     function delayedPhraseChanged() {
@@ -87,12 +89,57 @@
         hideValidationError();
         // Get the mnemonic phrase
         var phrase = DOM.phrase.val();
-        var passphrase = DOM.passphrase.val();
         var errorText = findPhraseErrors(phrase);
         if (errorText) {
             showValidationError(errorText);
             return;
         }
+        // Calculate and display
+        var passphrase = DOM.passphrase.val();
+        calcBip32RootKeyFromSeed(phrase, passphrase);
+        calcForDerivationPath();
+        hidePending();
+    }
+
+    function delayedRootKeyChanged() {
+        // Warn if there is an existing mnemonic or passphrase.
+        if (DOM.phrase.val().length > 0 || DOM.passphrase.val().length > 0) {
+            if (!confirm("This will clear existing mnemonic and passphrase")) {
+                DOM.rootKey.val(bip32RootKey);
+                return
+            }
+        }
+        hideValidationError();
+        showPending();
+        // Clear existing mnemonic and passphrase
+        DOM.phrase.val("");
+        DOM.passphrase.val("");
+        seed = null;
+        if (rootKeyChangedTimeoutEvent != null) {
+            clearTimeout(rootKeyChangedTimeoutEvent);
+        }
+        rootKeyChangedTimeoutEvent = setTimeout(rootKeyChanged, 400);
+    }
+
+    function rootKeyChanged() {
+        showPending();
+        hideValidationError();
+        // Validate the root key TODO
+        var rootKeyBase58 = DOM.rootKey.val();
+        var errorText = validateRootKey(rootKeyBase58);
+        if (errorText) {
+            showValidationError(errorText);
+            return;
+        }
+        // Calculate and display
+        calcBip32RootKeyFromBase58(rootKeyBase58);
+        calcForDerivationPath();
+        hidePending();
+    }
+
+    function calcForDerivationPath() {
+        showPending();
+        hideValidationError();
         // Get the derivation path
         var derivationPath = getDerivationPath();
         var errorText = findDerivationPathErrors(derivationPath);
@@ -100,8 +147,7 @@
             showValidationError(errorText);
             return;
         }
-        // Calculate and display
-        calcBip32Seed(phrase, passphrase, derivationPath);
+        calcBip32ExtendedKey(derivationPath);
         displayBip32Info();
         hidePending();
     }
@@ -148,9 +194,16 @@
         return words;
     }
 
-    function calcBip32Seed(phrase, passphrase, path) {
+    function calcBip32RootKeyFromSeed(phrase, passphrase) {
         seed = mnemonic.toSeed(phrase, passphrase);
         bip32RootKey = bitcoin.HDNode.fromSeedHex(seed, network);
+    }
+
+    function calcBip32RootKeyFromBase58(rootKeyBase58) {
+        bip32RootKey = bitcoin.HDNode.fromBase58(rootKeyBase58);
+    }
+
+    function calcBip32ExtendedKey(path) {
         bip32ExtendedKey = bip32RootKey;
         // Derive the key from the path
         var pathBits = path.split("/");
@@ -213,6 +266,16 @@
         return false;
     }
 
+    function validateRootKey(rootKeyBase58) {
+        try {
+            bitcoin.HDNode.fromBase58(rootKeyBase58);
+        }
+        catch (e) {
+            return "Invalid root key";
+        }
+        return "";
+    }
+
     function getDerivationPath() {
         if (DOM.bip44tab.hasClass("active")) {
             var purpose = parseIntNoNaN(DOM.bip44purpose.val(), 44);