remove cryptojs dependency from Key

lib/browser/Key.js

@@ -1,6 +1,4 @@
-var ECKey = require('../../browser/vendor-bundle.js').ECKey;
 var SecureRandom = require('../SecureRandom');
-var Curve = require('../Curve');
 var bignum = require('bignum');
 var elliptic = require('elliptic');
 
@@ -42,10 +40,24 @@ Object.defineProperty(Key.prototype, 'compressed', {
       return;
     var oldp = this._pub;
     if (this._pub) {
-      var eckey = new ECKey();
-      eckey.setPub(bufferToArray(this.public));
-      eckey.setCompressed(this._compressed);
-      this._pub = new Buffer(eckey.getPub());
+      if (this._compressed) {
+        var xbuf = this._pub.slice(1, 33);
+        var ybuf = this._pub.slice(33, 65);
+        var x = new bignum(xbuf);
+        var y = new bignum(ybuf);
+        var p = new Point(x, y);
+        this._pub = p.toCompressedPubKey();
+      } else {
+        var ec = elliptic.curves.secp256k1;
+        var xbuf = this._pub.slice(1, 33);
+        var odd = this._pub[0] == 3 ? true : false;
+        var p = ec.curve.pointFromX(odd, xbuf);
+        var ybuf = new Buffer(p.y.toArray());
+        var xb = new bignum(xbuf);
+        var yb = new bignum(ybuf);
+        var pb = new Point(xb, yb);
+        this._pub = pb.toUncompressedPubKey();
+      }
     }
     if (!this._compressed) {
       //bug in eckey
@@ -60,25 +72,19 @@ Object.defineProperty(Key.prototype, 'compressed', {
 Key.generateSync = function() {
   var privbuf;
 
+  var ec = elliptic.curves.secp256k1;
   while (true) {
     privbuf = SecureRandom.getRandomBuffer(32);
     if ((bignum.fromBuffer(privbuf, {
       size: 32
-    })).cmp(Curve.getN()) < 0)
+    })).cmp(ec.n) < 0)
       break;
   }
 
-  var privhex = privbuf.toString('hex');
-  var eck = new ECKey(privhex);
-  eck.setCompressed(true);
-  var pub = eck.getPub();
-
-  ret = new Key();
-  ret.private = privbuf;
-  ret._compressed = true;
-  ret.public = new Buffer(eck.getPub());
-
-  return ret;
+  var key = new Key();
+  key.private = privbuf;
+  key.regenerateSync();
+  return key;
 };
 
 Key.prototype.regenerateSync = function() {
@@ -101,12 +107,6 @@ Key.prototype.regenerateSync = function() {
 };
 
 Key.prototype.signSync = function(hash) {
-  /*
-  var getSECCurveByName = require('../../browser/vendor-bundle.js').getSECCurveByName;
-  var BigInteger = require('../../browser/vendor-bundle.js').BigInteger;
-  var rng = new SecureRandom();
-  var ecparams = getSECCurveByName('secp256k1');
-  */
   var ec = elliptic.curves.secp256k1;
 
   var genk = function() {
@@ -116,9 +116,7 @@ Key.prototype.signSync = function(hash) {
 
   var sign = function(hash, priv) {
     var d = priv;
-    //var n = ecparams.getN();
     var n = ec.n;
-    //var e = BigInteger.fromByteArrayUnsigned(hash);
     var e = new bignum(hash);
 
     do {
@@ -158,10 +156,7 @@ Key.prototype.signSync = function(hash) {
   if (!Buffer.isBuffer(hash) || hash.length !== 32) {
     throw new Error('Arg should be a 32 bytes hash buffer');
   }
-  //var privhex = this.private.toString('hex');
-  //var privnum = new BigInteger(privhex, 16);
   var privnum = new bignum(this.private);
-  //var signature = sign(bufferToArray(hash), privnum);
   var signature = sign(hash, privnum);
 
   return new Buffer(signature);
@@ -177,24 +172,12 @@ Key.prototype.verifySignature = function(hash, sig, callback) {
 };
 
 Key.prototype.verifySignatureSync = function(hash, sig) {
-  var self = this;
-
-  if (!Buffer.isBuffer(hash) || hash.length !== 32) {
-    throw new Error('Arg 1 should be a 32 bytes hash buffer');
-  }
-  if (!Buffer.isBuffer(sig)) {
-    throw new Error('Arg 2 should be a buffer');
-  }
-  if (!self.public) {
-    throw new Error('Key does not have a public key set');
-  }
-
-  var eck = new ECKey();
-  eck.setPub(bufferToArray(self.public));
-  eck.setCompressed(self._compressed);
-  var sigA = bufferToArray(sig);
-  var ret = eck.verify(bufferToArray(hash), sigA);
-  return ret;
+  var ec = new elliptic.ec(elliptic.curves.secp256k1);
+  var msg = hash.toString('hex');
+  var pub = this._pub.toString('hex');
+  var sig = sig.toString('hex');
+  var v = ec.verify(msg, sig, pub);
+  return v;
 };
 
 module.exports = Key;