1 files changed, 68 insertions, 0 deletions
diff --git a/node_modules/pbkdf2/browser.js b/node_modules/pbkdf2/browser.js
new file mode 100644
index 000000000..e07b5ad5a
--- /dev/null
+++ b/node_modules/pbkdf2/browser.js
@@ -0,0 +1,68 @@
+var createHmac = require('create-hmac')
+var checkParameters = require('./precondition')
+
+exports.pbkdf2 = function (password, salt, iterations, keylen, digest, callback) {
+  if (typeof digest === 'function') {
+    callback = digest
+    digest = undefined
+  }
+
+  checkParameters(iterations, keylen)
+  if (typeof callback !== 'function') throw new Error('No callback provided to pbkdf2')
+
+  setTimeout(function () {
+    callback(null, exports.pbkdf2Sync(password, salt, iterations, keylen, digest))
+  })
+}
+
+var defaultEncoding
+if (process.browser) {
+  defaultEncoding = 'utf-8'
+} else {
+  var pVersionMajor = parseInt(process.version.split('.')[0].slice(1), 10)
+
+  defaultEncoding = pVersionMajor >= 6 ? 'utf-8' : 'binary'
+}
+
+exports.pbkdf2Sync = function (password, salt, iterations, keylen, digest) {
+  if (!Buffer.isBuffer(password)) password = new Buffer(password, defaultEncoding)
+  if (!Buffer.isBuffer(salt)) salt = new Buffer(salt, defaultEncoding)
+
+  checkParameters(iterations, keylen)
+
+  digest = digest || 'sha1'
+
+  var hLen
+  var l = 1
+  var DK = new Buffer(keylen)
+  var block1 = new Buffer(salt.length + 4)
+  salt.copy(block1, 0, 0, salt.length)
+
+  var r
+  var T
+
+  for (var i = 1; i <= l; i++) {
+    block1.writeUInt32BE(i, salt.length)
+    var U = createHmac(digest, password).update(block1).digest()
+
+    if (!hLen) {
+      hLen = U.length
+      T = new Buffer(hLen)
+      l = Math.ceil(keylen / hLen)
+      r = keylen - (l - 1) * hLen
+    }
+
+    U.copy(T, 0, 0, hLen)
+
+    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]
+    }
+
+    var destPos = (i - 1) * hLen
+    var len = (i === l ? r : hLen)
+    T.copy(DK, destPos, 0, len)
+  }
+
+  return DK
+}