diff --git a/lib/crypto/crypto.js b/lib/crypto/crypto.js
index 3575e0d1..083c0655 100644
--- a/lib/crypto/crypto.js
+++ b/lib/crypto/crypto.js
@@ -9,6 +9,8 @@
 
 var assert = require('assert');
 var random = require('./random');
+var scrypt = require('./scrypt');
+var scryptAsync = require('./scrypt-async');
 var native = require('../utils/native');
 var nativeCrypto, supersha, hash, aes;
 
@@ -139,7 +141,7 @@ if (native)
   crypto.hmac = native.hmac;
 
 /**
- * Perform key stretching using PBKDF2.
+ * Perform key derivation using PBKDF2.
  * @param {Buffer} key
  * @param {Buffer} salt
  * @param {Number} iter
@@ -148,7 +150,7 @@ if (native)
  * @returns {Buffer}
  */
 
-crypto.pbkdf2Sync = function pbkdf2Sync(key, salt, iter, len, alg) {
+crypto.pbkdf2 = function pbkdf2(key, salt, iter, len, alg) {
   if (typeof key === 'string')
     key = new Buffer(key, 'utf8');
 
@@ -171,7 +173,7 @@ crypto.pbkdf2Sync = function pbkdf2Sync(key, salt, iter, len, alg) {
  * @param {Function} callback
  */
 
-crypto.pbkdf2 = function pbkdf2(key, salt, iter, len, alg, callback) {
+crypto.pbkdf2Async = function pbkdf2Async(key, salt, iter, len, alg, callback) {
   var result;
 
   if (typeof key === 'string')
@@ -192,6 +194,48 @@ crypto.pbkdf2 = function pbkdf2(key, salt, iter, len, alg, callback) {
   return callback(null, result);
 };
 
+/**
+ * Perform key derivation using scrypt.
+ * @param {Buffer} passwd
+ * @param {Buffer} salt
+ * @param {Number} N
+ * @param {Number} r
+ * @param {Number} p
+ * @param {Number} len
+ * @returns {Buffer}
+ */
+
+crypto.scrypt = function _scrypt(passwd, salt, N, r, p, len) {
+  if (typeof passwd === 'string')
+    passwd = new Buffer(passwd, 'utf8');
+
+  if (typeof salt === 'string')
+    salt = new Buffer(salt, 'utf8');
+
+  return scrypt(passwd, salt, N, r, p, len);
+};
+
+/**
+ * Execute scrypt asynchronously.
+ * @param {Buffer} passwd
+ * @param {Buffer} salt
+ * @param {Number} N
+ * @param {Number} r
+ * @param {Number} p
+ * @param {Number} len
+ * @param {Function} callback
+ */
+
+crypto.scryptAsync = function _scryptAsync(passwd, salt, N, r, p, len, callback) {
+  if (typeof passwd === 'string')
+    passwd = new Buffer(passwd, 'utf8');
+
+  if (typeof salt === 'string')
+    salt = new Buffer(salt, 'utf8');
+
+  return scryptAsync(passwd, salt, N, r, p, len, callback);
+};
+
 /**
  * Derive a key using pbkdf2 with 50,000 iterations.
  * @param {Buffer|String} passphrase
@@ -199,7 +243,7 @@ crypto.pbkdf2 = function pbkdf2(key, salt, iter, len, alg, callback) {
  */
 
 crypto.derive = function derive(passphrase, callback) {
-  crypto.pbkdf2(passphrase, 'bcoin', 50000, 32, 'sha256', callback);
+  crypto.pbkdf2Async(passphrase, 'bcoin', 50000, 32, 'sha256', callback);
 };
 
 /**
@@ -304,7 +348,7 @@ crypto.decipher = function decipher(data, key, iv) {
 };
 
 /**
- * Perform key stretching using PBKDF2.
+ * Perform key derivation using PBKDF2.
  * @private
  * @param {Buffer} key
  * @param {Buffer} salt
diff --git a/lib/crypto/scrypt-async.js b/lib/crypto/scrypt-async.js
index 2eb14fd9..419f1afa 100644
--- a/lib/crypto/scrypt-async.js
+++ b/lib/crypto/scrypt-async.js
@@ -51,18 +51,9 @@ var U32Array = typeof Uint32Array === 'function' ? Uint32Array : Array;
  * @returns {Buffer}
  */
 
-function scrypt(passwd, salt, N, r, p, len, callback) {
+function scryptAsync(passwd, salt, N, r, p, len, callback) {
   var V, XY;
 
-  if (typeof passwd === 'string')
-    passwd = new Buffer(passwd, 'utf8');
-
-  if (typeof salt === 'string')
-    salt = new Buffer(salt, 'utf8');
-
-  if (native)
-    return native.scryptAsync(passwd, salt, N, r, p, len, callback);
-
   if (r * p >= (1 << 30))
     return callback(new Error('EFBIG'));
 
@@ -75,7 +66,7 @@ function scrypt(passwd, salt, N, r, p, len, callback) {
   XY = new Buffer(256 * r);
   V = new Buffer(128 * r * N);
 
-  crypto.pbkdf2(passwd, salt, 1, p * 128 * r, 'sha256', function(err, B) {
+  crypto.pbkdf2Async(passwd, salt, 1, p * 128 * r, 'sha256', function(err, B) {
     if (err)
       return callback(err);
 
@@ -85,11 +76,14 @@ function scrypt(passwd, salt, N, r, p, len, callback) {
       if (err)
         return callback(err);
 
-      crypto.pbkdf2(passwd, B, 1, len, 'sha256', callback);
+      crypto.pbkdf2Async(passwd, B, 1, len, 'sha256', callback);
     });
   });
 }
 
+if (native)
+  scryptAsync = native.scryptAsync;
+
 function salsa20_8(B) {
   var B32 = new U32Array(16);
   var x = new U32Array(16);
@@ -232,4 +226,4 @@ function forRangeSerial(from, to, iter, callback) {
  * Expose
  */
 
-module.exports = scrypt;
+module.exports = scryptAsync;
diff --git a/lib/crypto/scrypt.js b/lib/crypto/scrypt.js
index 4a8294f5..873610f1 100644
--- a/lib/crypto/scrypt.js
+++ b/lib/crypto/scrypt.js
@@ -53,15 +53,6 @@ var U32Array = typeof Uint32Array === 'function' ? Uint32Array : Array;
 function scrypt(passwd, salt, N, r, p, len) {
   var i, B, V, XY;
 
-  if (typeof passwd === 'string')
-    passwd = new Buffer(passwd, 'utf8');
-
-  if (typeof salt === 'string')
-    salt = new Buffer(salt, 'utf8');
-
-  if (native)
-    return native.scrypt(passwd, salt, N, r, p, len);
-
   if (r * p >= (1 << 30))
     throw new Error('EFBIG');
 
@@ -74,14 +65,17 @@ function scrypt(passwd, salt, N, r, p, len) {
   XY = new Buffer(256 * r);
   V = new Buffer(128 * r * N);
 
-  B = crypto.pbkdf2Sync(passwd, salt, 1, p * 128 * r, 'sha256');
+  B = crypto.pbkdf2(passwd, salt, 1, p * 128 * r, 'sha256');
 
   for (i = 0; i < p; i++)
     smix(B, i * 128 * r, r, N, V, XY);
 
-  return crypto.pbkdf2Sync(passwd, B, 1, len, 'sha256');
+  return crypto.pbkdf2(passwd, B, 1, len, 'sha256');
 }
 
+if (native)
+  scrypt = native.scrypt;
+
 function salsa20_8(B) {
   var B32 = new U32Array(16);
   var x = new U32Array(16);
diff --git a/lib/hd/mnemonic.js b/lib/hd/mnemonic.js
index 93d44509..7b8dc365 100644
--- a/lib/hd/mnemonic.js
+++ b/lib/hd/mnemonic.js
@@ -142,7 +142,7 @@ Mnemonic.prototype.toSeed = function toSeed(passphrase) {
 
   this.passphrase = passphrase;
 
-  return crypto.pbkdf2Sync(
+  return crypto.pbkdf2(
     nfkd(this.getPhrase()),
     nfkd('mnemonic' + passphrase),
     2048, 64, 'sha512');
diff --git a/test/aes-test.js b/test/aes-test.js
index 21d62eab..d4617102 100644
--- a/test/aes-test.js
+++ b/test/aes-test.js
@@ -9,7 +9,7 @@ var nativeCrypto = require('crypto');
 
 describe('AES', function() {
   function pbkdf2key(passphrase, iterations, dkLen, ivLen, alg) {
-    var key = crypto.pbkdf2Sync(passphrase, '', iterations, dkLen + ivLen, 'sha512');
+    var key = crypto.pbkdf2(passphrase, '', iterations, dkLen + ivLen, 'sha512');
     return {
       key: key.slice(0, dkLen),
       iv: key.slice(dkLen, dkLen + ivLen)
diff --git a/test/hd-test.js b/test/hd-test.js
index 89e0e72a..c6cb3865 100644
--- a/test/hd-test.js
+++ b/test/hd-test.js
@@ -91,7 +91,7 @@ describe('HD', function() {
   var master, child1, child2, child3, child4, child5, child6;
 
   it('should create a pbkdf2 seed', function() {
-    var checkSeed = crypto.pbkdf2Sync(
+    var checkSeed = crypto.pbkdf2(
       phrase, 'mnemonic' + 'foo', 2048, 64, 'sha512').toString('hex');
     assert.equal(checkSeed, seed);
   });
diff --git a/test/scrypt-test.js b/test/scrypt-test.js
index fd409e1b..7de5c701 100644
--- a/test/scrypt-test.js
+++ b/test/scrypt-test.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var assert = require('assert');
-var scrypt = require('../lib/crypto/scrypt');
+var scrypt = require('../lib/crypto/crypto').scrypt;
 
 describe('Scrypt', function() {
   it('should perform scrypt with N=16', function() {
@@ -13,7 +13,7 @@ describe('Scrypt', function() {
   });
 
   it('should perform scrypt with N=1024', function() {
-    var result = scrypt('password', 'NaCl', 1024, 8, 16, 64)
+    var result = scrypt('password', 'NaCl', 1024, 8, 16, 64);
     assert.equal(result.toString('hex'), ''
       + 'fdbabe1c9d3472007856e7190d01e9fe7c6ad7cbc8237830e773'
       + '76634b3731622eaf30d92e22a3886ff109279d9830dac727afb9'