diff --git a/lib/key.js b/lib/key.js
index bec7295..a73bae2 100644
--- a/lib/key.js
+++ b/lib/key.js
@@ -1,8 +1,7 @@
 var Address = require('../lib/address');
 var Privkey = require('./privkey');
 var Pubkey = require('./pubkey');
-var Random = require('./random');
-var Bn = require('./bn');
+var BN = require('./bn');
 var point = require('./point');
 
 var Key = function Key(obj) {
@@ -19,11 +18,7 @@ Key.prototype.set = function(obj) {
 };
 
 Key.prototype.fromRandom = function() {
-  do {
-    var privbuf = Random.getRandomBuffer(32);
-    this.privkey = new Privkey({bn: Bn(privbuf)});
-    var condition = this.privkey.bn.lt(point.getN());
-  } while (!condition);
+  this.privkey = Privkey().fromRandom();
   this.privkey2pubkey();
   return this;
 };
diff --git a/lib/privkey.js b/lib/privkey.js
index d012fa8..d04972a 100644
--- a/lib/privkey.js
+++ b/lib/privkey.js
@@ -1,7 +1,8 @@
-var Bn = require('./bn');
+var BN = require('./bn');
 var point = require('./point');
 var constants = require('./constants');
 var base58check = require('./base58check');
+var Random = require('./random');
 
 var Privkey = function Privkey(obj) {
   if (!(this instanceof Privkey))
@@ -17,6 +18,16 @@ Privkey.prototype.set = function(obj) {
   return this;
 };
 
+Privkey.prototype.fromRandom = function() {
+  do {
+    var privbuf = Random.getRandomBuffer(32);
+    var bn = BN().fromBuffer(privbuf);
+    var condition = bn.lt(point.getN());
+  } while (!condition);
+  this.bn = bn;
+  return this;
+};
+
 Privkey.prototype.validate = function() {
   if (!this.bn.lt(point.getN()))
     throw new Error('Number must be less than N');
@@ -62,7 +73,7 @@ Privkey.prototype.fromWIF = function(str) {
   else
     throw new Error('Invalid networkstr');
 
-  this.bn = Bn.fromBuffer(buf.slice(1, 32 + 1));
+  this.bn = BN.fromBuffer(buf.slice(1, 32 + 1));
 };
 
 Privkey.prototype.toString = function() {
diff --git a/test/test.privkey.js b/test/test.privkey.js
index ed0a4ce..6cc0afa 100644
--- a/test/test.privkey.js
+++ b/test/test.privkey.js
@@ -1,6 +1,7 @@
 var Privkey = require('../lib/privkey');
 var base58check = require('../lib/base58check');
-var Bn = require('../lib/bn');
+var BN = require('../lib/bn');
+var Point = require('../lib/point');
 var should = require('chai').should();
 
 describe('Privkey', function() {
@@ -17,24 +18,34 @@ describe('Privkey', function() {
   });
 
   it('should create a mainnet private key', function() {
-    var privkey = new Privkey({bn: Bn.fromBuffer(buf), networkstr: 'mainnet', compressed: true});
+    var privkey = new Privkey({bn: BN.fromBuffer(buf), networkstr: 'mainnet', compressed: true});
     privkey.toString().should.equal(encmainnet);
   });
 
   it('should create an uncompressed testnet private key', function() {
-    var privkey = new Privkey({bn: Bn.fromBuffer(buf), networkstr: 'testnet', compressed: false});
+    var privkey = new Privkey({bn: BN.fromBuffer(buf), networkstr: 'testnet', compressed: false});
     privkey.toString().should.equal(enctu);
   });
 
   it('should create an uncompressed mainnet private key', function() {
-    var privkey = new Privkey({bn: Bn.fromBuffer(buf), networkstr: 'mainnet', compressed: false});
+    var privkey = new Privkey({bn: BN.fromBuffer(buf), networkstr: 'mainnet', compressed: false});
     privkey.toString().should.equal(encmu);
   });
 
   describe('#set', function() {
     
     it('should set bn', function() {
-      should.exist(Privkey().set({bn: Bn.fromBuffer(buf)}).bn);
+      should.exist(Privkey().set({bn: BN.fromBuffer(buf)}).bn);
+    });
+
+  });
+
+  describe('#fromRandom', function() {
+    
+    it('should set bn gt 0 and lt n', function() {
+      var privkey = Privkey().fromRandom();
+      privkey.bn.gt(BN(0)).should.equal(true);
+      privkey.bn.lt(Point.getN()).should.equal(true);
     });
 
   });