diff --git a/src/util.js b/src/crypto.js
similarity index 100%
rename from src/util.js
rename to src/crypto.js
diff --git a/src/eckey.js b/src/eckey.js
index 190e6de..c6acd4c 100644
--- a/src/eckey.js
+++ b/src/eckey.js
@@ -7,7 +7,7 @@ var ecdsa = require('./ecdsa')
 var ECPointFp = require('./jsbn/ec').ECPointFp
 var sec = require('./jsbn/sec')
 var Network = require('./network')
-var util = require('./util')
+var crypto = require('./crypto')
 var ecparams = sec("secp256k1")
 
 // input can be nothing, array of bytes, hex string, or base58 string
@@ -175,7 +175,7 @@ ECPubKey.prototype.toString = ECPubKey.prototype.toHex
 ECPubKey.prototype.getAddress = function(version) {
   version = version || Network.mainnet.addressVersion
 
-  return new Address(util.sha256ripe160(this.toBytes()), version)
+  return new Address(crypto.sha256ripe160(this.toBytes()), version)
 }
 
 ECPubKey.prototype.verify = function(hash, sig) {
diff --git a/src/hdwallet.js b/src/hdwallet.js
index a6998b5..9bfabd8 100644
--- a/src/hdwallet.js
+++ b/src/hdwallet.js
@@ -2,7 +2,7 @@ var convert = require('./convert.js')
 var base58 = require('./base58.js')
 var assert = require('assert')
 var format = require('util').format
-var util = require('./util.js')
+var crypto = require('./crypto')
 var Crypto = require('crypto-js')
 var HmacSHA512 = Crypto.HmacSHA512
 var HMAC= Crypto.algo.HMAC
@@ -11,10 +11,10 @@ var ECPubKey = require('./eckey.js').ECPubKey
 var Address = require('./address.js')
 var Network = require('./network')
 
-var crypto = require('crypto')
+var crypto2 = require('crypto')
 
 function sha256(buf) {
-  var hash = crypto.createHash('sha256')
+  var hash = crypto2.createHash('sha256')
   hash.update(buf)
 
   return hash.digest()
@@ -131,7 +131,7 @@ HDWallet.fromBytes = function(input) {
 }
 
 HDWallet.prototype.getIdentifier = function() {
-  return util.sha256ripe160(this.pub.toBytes())
+  return crypto.sha256ripe160(this.pub.toBytes())
 }
 
 HDWallet.prototype.getFingerprint = function() {
@@ -139,7 +139,7 @@ HDWallet.prototype.getFingerprint = function() {
 }
 
 HDWallet.prototype.getAddress = function() {
-  return new Address(util.sha256ripe160(this.pub.toBytes()), this.getKeyVersion())
+  return new Address(crypto.sha256ripe160(this.pub.toBytes()), this.getKeyVersion())
 }
 
 HDWallet.prototype.toBytes = function(priv) {
diff --git a/src/index.js b/src/index.js
index 52fd4f4..040216b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -12,7 +12,7 @@ module.exports = {
   Script: require('./script'),
   Opcode: require('./opcode'),
   Transaction: T.Transaction,
-  Util: require('./util'),
+  crypto: require('./crypto'),
   TransactionIn: T.TransactionIn,
   TransactionOut: T.TransactionOut,
   ECPointFp: require('./jsbn/ec').ECPointFp,
diff --git a/src/script.js b/src/script.js
index 49d78fa..1a21484 100644
--- a/src/script.js
+++ b/src/script.js
@@ -1,5 +1,5 @@
 var Opcode = require('./opcode')
-var util = require('./util')
+var crypto = require('./crypto')
 var convert = require('./convert')
 var Address = require('./address')
 var network = require('./network')
@@ -144,10 +144,10 @@ Script.prototype.toScriptHash = function() {
   }
 
   if (outType == 'P2SH') {
-    return util.sha256ripe160(this.buffer)
+    return crypto.sha256ripe160(this.buffer)
   }
 
-  return util.sha256ripe160(this.buffer)
+  return crypto.sha256ripe160(this.buffer)
 }
 
 //TODO: support testnet
@@ -257,7 +257,7 @@ Script.prototype.simpleInPubKey = function() {
  * This method is useful for indexing transactions.
  */
 Script.prototype.simpleInHash = function() {
-  return util.sha256ripe160(this.simpleInPubKey())
+  return crypto.sha256ripe160(this.simpleInPubKey())
 }
 
 /**
diff --git a/src/transaction.js b/src/transaction.js
index 55e9954..2edec9c 100644
--- a/src/transaction.js
+++ b/src/transaction.js
@@ -1,6 +1,6 @@
 var BigInteger = require('./jsbn/jsbn')
 var Script = require('./script')
-var util = require('./util')
+var crypto = require('./crypto')
 var convert = require('./convert')
 var ECKey = require('./eckey').ECKey
 var ECDSA = require('./ecdsa')
@@ -303,7 +303,7 @@ Transaction.prototype.sign = function(index, key, type) {
   // TODO: getPub is slow, sha256ripe160 probably is too.
   // This could be sped up a lot by providing these as inputs.
   var pub = key.getPub().toBytes(),
-  hash160 = util.sha256ripe160(pub),
+  hash160 = crypto.sha256ripe160(pub),
   script = Script.createOutputScript(new Address(hash160)),
   hash = this.hashTransactionForSignature(script, index, type),
   sig = key.sign(hash).concat([type])
diff --git a/test/script.js b/test/script.js
index b6ce5e9..ddf0101 100644
--- a/test/script.js
+++ b/test/script.js
@@ -2,8 +2,8 @@ var Script = require('../src/script.js')
 var assert = require('assert')
 var Address = require('../src/address.js')
 var Network = require('../src/network.js')
-var Util = require('../src/util.js')
-var sha256ripe160 = Util.sha256ripe160
+var crypto = require('../').crypto
+var sha256ripe160 = crypto.sha256ripe160
 var Convert = require('../src/convert.js')
 var bytesToHex = Convert.bytesToHex
 var hexToBytes = Convert.hexToBytes