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1 files changed, 28 insertions, 0 deletions

diff --git a/node_modules/pbkdf2/lib/precondition.js b/node_modules/pbkdf2/lib/precondition.js
new file mode 100644
index 00000000..683db563
--- /dev/null
+++ b/node_modules/pbkdf2/lib/precondition.js
@@ -0,0 +1,28 @@
+var MAX_ALLOC = Math.pow(2, 30) - 1 // default in iojs
+
+function checkBuffer (buf, name) {
+  if (typeof buf !== 'string' && !Buffer.isBuffer(buf)) {
+    throw new TypeError(name + ' must be a buffer or string')
+  }
+}
+
+module.exports = function (password, salt, iterations, keylen) {
+  checkBuffer(password, 'Password')
+  checkBuffer(salt, 'Salt')
+
+  if (typeof iterations !== 'number') {
+    throw new TypeError('Iterations not a number')
+  }
+
+  if (iterations < 0) {
+    throw new TypeError('Bad iterations')
+  }
+
+  if (typeof keylen !== 'number') {
+    throw new TypeError('Key length not a number')
+  }
+
+  if (keylen < 0 || keylen > MAX_ALLOC || keylen !== keylen) { /* eslint no-self-compare: 0 */
+    throw new TypeError('Bad key length')
+  }
+}