Merge pull request #482 from ryanxcharles/bug/k-too-small

k should be 32 bytes, not 8 bytes

lib/common/Key.js

@@ -159,7 +159,8 @@ Key.calcPubKeyRecoveryParam = function(e, r, s, Q) {
 
 Key.genk = function() {
   //TODO: account for when >= n
-  return new bignum(SecureRandom.getRandomBuffer(8));
+  var k = new bignum(SecureRandom.getRandomBuffer(32))
+  return k;
 };
 
 module.exports = Key;