Pad eth private keys correctly

Fixes #469

2 files changed, 23 insertions, 1 deletions

diff --git a/src/js/index.js b/src/js/index.js
index 96fc451..c502208 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -1238,7 +1238,7 @@
                     address = libs.ethUtil.addHexPrefix(checksumAddress);
                     pubkey = libs.ethUtil.addHexPrefix(pubkey);
                     if (hasPrivkey) {
-                        privkey = libs.ethUtil.bufferToHex(keyPair.d.toBuffer());
+                        privkey = libs.ethUtil.bufferToHex(keyPair.d.toBuffer(32));
                     }
                 }
                 //TRX is different
diff --git a/tests/spec/tests.js b/tests/spec/tests.js
index 10575ef..d57b753 100644
--- a/tests/spec/tests.js
+++ b/tests/spec/tests.js
@@ -5122,4 +5122,26 @@ it('Generates ethereum addresses from a public key', function(done) {
     });
 });
 
+// https://github.com/iancoleman/bip39/issues/469
+fit('Generates ethereum private keys with the correct padding', function(done) {
+  var phrase = "flip vicious divorce angle toward say derive blue refuse load word creek once expire bounce";
+  let withoutPadding = "0x53121fc5d193e623d2dbf43b2a96640bbed16bd530947fff8dda12f1aec828";
+  let withPadding = "0x0053121fc5d193e623d2dbf43b2a96640bbed16bd530947fff8dda12f1aec828";
+  let skIndex = 15;
+  driver.findElement(By.css('.phrase'))
+      .sendKeys(phrase);
+    selectNetwork('ETH - Ethereum');
+    driver.sleep(generateDelay).then(function() {
+        driver.findElements(By.css(".privkey"))
+            .then(function(els) {
+                els[skIndex].getText()
+                    .then(function(sk) {
+                        expect(sk).toBe(withPadding);
+                        expect(sk).not.toBe(withoutPadding);
+                        done();
+                    });
+            })
+    });
+});
+
 });