4 files changed, 32 insertions, 36 deletions
diff --git a/node_modules/pbkdf2/index.js b/node_modules/pbkdf2/index.js
index c3e4f5cb3..74df093e6 100644
--- a/node_modules/pbkdf2/index.js
+++ b/node_modules/pbkdf2/index.js
@@ -1,8 +1,9 @@
 var crypto = require('crypto')
 /* istanbul ignore next */
-if (crypto.pbkdf2Sync.toString().indexOf('keylen, digest') === -1) {
-  throw new Error('Unsupported crypto version')
+if (crypto && crypto.pbkdf2Sync && crypto.pbkdf2Sync.toString().indexOf('keylen, digest') === -1) {
+  exports.pbkdf2 = require('./lib/async')
+  exports.pbkdf2Sync = require('./lib/sync')
+} else {
+  exports.pbkdf2Sync = crypto.pbkdf2Sync
+  exports.pbkdf2 = crypto.pbkdf2
 }
-
-exports.pbkdf2Sync = crypto.pbkdf2Sync
-exports.pbkdf2 = crypto.pbkdf2
diff --git a/node_modules/pbkdf2/lib/sync-browser.js b/node_modules/pbkdf2/lib/sync-browser.js
index 2452e9fe3..7f0bf9131 100644
--- a/node_modules/pbkdf2/lib/sync-browser.js
+++ b/node_modules/pbkdf2/lib/sync-browser.js
@@ -16,6 +16,7 @@ var sizes = {
   rmd160: 20,
   ripemd160: 20
 }
+
 function Hmac (alg, key, saltLen) {
   var hash = getDigest(alg)
   var blocksize = (alg === 'sha512' || alg === 'sha384') ? 128 : 64
@@ -52,16 +53,16 @@ Hmac.prototype.run = function (data, ipad) {
 }
 
 function getDigest (alg) {
-  if (alg === 'rmd160' || alg === 'ripemd160') return rmd160
-  if (alg === 'md5') return md5
-  return shaFunc
-
   function shaFunc (data) {
     return sha(alg).update(data).digest()
   }
+
+  if (alg === 'rmd160' || alg === 'ripemd160') return rmd160
+  if (alg === 'md5') return md5
+  return shaFunc
 }
 
-module.exports = function (password, salt, iterations, keylen, digest) {
+function pbkdf2 (password, salt, iterations, keylen, digest) {
   if (!Buffer.isBuffer(password)) password = Buffer.from(password, defaultEncoding)
   if (!Buffer.isBuffer(salt)) salt = Buffer.from(salt, defaultEncoding)
 
@@ -75,28 +76,26 @@ module.exports = function (password, salt, iterations, keylen, digest) {
   var block1 = Buffer.allocUnsafe(salt.length + 4)
   salt.copy(block1, 0, 0, salt.length)
 
-  var U, j, destPos, len
-
-  var hLen = hmac.size
-  var T = Buffer.allocUnsafe(hLen)
+  var destPos = 0
+  var hLen = sizes[digest]
   var l = Math.ceil(keylen / hLen)
-  var r = keylen - (l - 1) * hLen
 
   for (var i = 1; i <= l; i++) {
     block1.writeUInt32BE(i, salt.length)
-    U = hmac.run(block1, hmac.ipad1)
 
-    U.copy(T, 0, 0, hLen)
+    var T = hmac.run(block1, hmac.ipad1)
+    var U = T
 
-    for (j = 1; j < iterations; j++) {
+    for (var j = 1; j < iterations; j++) {
       U = hmac.run(U, hmac.ipad2)
       for (var k = 0; k < hLen; k++) T[k] ^= U[k]
     }
 
-    destPos = (i - 1) * hLen
-    len = (i === l ? r : hLen)
-    T.copy(DK, destPos, 0, len)
+    T.copy(DK, destPos)
+    destPos += hLen
   }
 
   return DK
 }
+
+module.exports = pbkdf2
diff --git a/node_modules/pbkdf2/lib/sync.js b/node_modules/pbkdf2/lib/sync.js
index 762e2f4e4..67b2e543d 100644
--- a/node_modules/pbkdf2/lib/sync.js
+++ b/node_modules/pbkdf2/lib/sync.js
@@ -13,41 +13,38 @@ var createHmac = require('create-hmac')
 var checkParameters = require('../lib/precondition')
 var defaultEncoding = require('../lib/default-encoding')
 var Buffer = require('safe-buffer').Buffer
-module.exports = pbkdf2
+
 function pbkdf2 (password, salt, iterations, keylen, digest) {
   if (!Buffer.isBuffer(password)) password = Buffer.from(password, defaultEncoding)
   if (!Buffer.isBuffer(salt)) salt = Buffer.from(salt, defaultEncoding)
 
   checkParameters(iterations, keylen)
-
   digest = digest || 'sha1'
 
   var DK = Buffer.allocUnsafe(keylen)
   var block1 = Buffer.allocUnsafe(salt.length + 4)
   salt.copy(block1, 0, 0, salt.length)
 
-  var U, j, destPos, len
-
+  var destPos = 0
   var hLen = sizes[digest]
-  var T = Buffer.allocUnsafe(hLen)
   var l = Math.ceil(keylen / hLen)
-  var r = keylen - (l - 1) * hLen
 
   for (var i = 1; i <= l; i++) {
     block1.writeUInt32BE(i, salt.length)
-    U = createHmac(digest, password).update(block1).digest()
 
-    U.copy(T, 0, 0, hLen)
+    var T = createHmac(digest, password).update(block1).digest()
+    var U = T
 
-    for (j = 1; j < iterations; j++) {
+    for (var j = 1; j < iterations; j++) {
       U = createHmac(digest, password).update(U).digest()
       for (var k = 0; k < hLen; k++) T[k] ^= U[k]
     }
 
-    destPos = (i - 1) * hLen
-    len = (i === l ? r : hLen)
-    T.copy(DK, destPos, 0, len)
+    T.copy(DK, destPos)
+    destPos += hLen
   }
 
   return DK
 }
+
+module.exports = pbkdf2
diff --git a/node_modules/pbkdf2/package.json b/node_modules/pbkdf2/package.json
index fbd101898..716b50631 100644
--- a/node_modules/pbkdf2/package.json
+++ b/node_modules/pbkdf2/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pbkdf2",
-  "version": "3.0.12",
+  "version": "3.0.13",
   "description": "This library provides the functionality of PBKDF2 with the ability to use any supported hashing algorithm returned from crypto.getHashes()",
   "keywords": [
     "pbkdf2",
@@ -42,8 +42,7 @@
     "browserify": "*",
     "nyc": "^6.4.0",
     "standard": "*",
-    "tape": "^4.5.1",
-    "microtime": "^2.1.3"
+    "tape": "^4.5.1"
   },
   "dependencies": {
     "create-hash": "^1.1.2",