1 files changed, 102 insertions, 0 deletions
diff --git a/node_modules/pbkdf2/lib/async.js b/node_modules/pbkdf2/lib/async.js
new file mode 100644
index 0000000..9ef67c3
--- /dev/null
+++ b/node_modules/pbkdf2/lib/async.js
@@ -0,0 +1,102 @@
+var Buffer = require('safe-buffer').Buffer
+
+var checkParameters = require('./precondition')
+var defaultEncoding = require('./default-encoding')
+var sync = require('./sync')
+var toBuffer = require('./to-buffer')
+
+var ZERO_BUF
+var subtle = global.crypto && global.crypto.subtle
+var toBrowser = {
+  sha: 'SHA-1',
+  'sha-1': 'SHA-1',
+  sha1: 'SHA-1',
+  sha256: 'SHA-256',
+  'sha-256': 'SHA-256',
+  sha384: 'SHA-384',
+  'sha-384': 'SHA-384',
+  'sha-512': 'SHA-512',
+  sha512: 'SHA-512'
+}
+var checks = []
+function checkNative (algo) {
+  if (global.process && !global.process.browser) {
+    return Promise.resolve(false)
+  }
+  if (!subtle || !subtle.importKey || !subtle.deriveBits) {
+    return Promise.resolve(false)
+  }
+  if (checks[algo] !== undefined) {
+    return checks[algo]
+  }
+  ZERO_BUF = ZERO_BUF || Buffer.alloc(8)
+  var prom = browserPbkdf2(ZERO_BUF, ZERO_BUF, 10, 128, algo)
+    .then(function () {
+      return true
+    }).catch(function () {
+      return false
+    })
+  checks[algo] = prom
+  return prom
+}
+
+function browserPbkdf2 (password, salt, iterations, length, algo) {
+  return subtle.importKey(
+    'raw', password, { name: 'PBKDF2' }, false, ['deriveBits']
+  ).then(function (key) {
+    return subtle.deriveBits({
+      name: 'PBKDF2',
+      salt: salt,
+      iterations: iterations,
+      hash: {
+        name: algo
+      }
+    }, key, length << 3)
+  }).then(function (res) {
+    return Buffer.from(res)
+  })
+}
+
+function resolvePromise (promise, callback) {
+  promise.then(function (out) {
+    process.nextTick(function () {
+      callback(null, out)
+    })
+  }, function (e) {
+    process.nextTick(function () {
+      callback(e)
+    })
+  })
+}
+module.exports = function (password, salt, iterations, keylen, digest, callback) {
+  if (typeof digest === 'function') {
+    callback = digest
+    digest = undefined
+  }
+
+  digest = digest || 'sha1'
+  var algo = toBrowser[digest.toLowerCase()]
+
+  if (!algo || typeof global.Promise !== 'function') {
+    return process.nextTick(function () {
+      var out
+      try {
+        out = sync(password, salt, iterations, keylen, digest)
+      } catch (e) {
+        return callback(e)
+      }
+      callback(null, out)
+    })
+  }
+
+  checkParameters(iterations, keylen)
+  password = toBuffer(password, defaultEncoding, 'Password')
+  salt = toBuffer(salt, defaultEncoding, 'Salt')
+  if (typeof callback !== 'function') throw new Error('No callback provided to pbkdf2')
+
+  resolvePromise(checkNative(algo).then(function (resp) {
+    if (resp) return browserPbkdf2(password, salt, iterations, keylen, algo)
+
+    return sync(password, salt, iterations, keylen, digest)
+  }), callback)
+}