Move parts from enterprise.platformKeysInternal to platformKeysInternal for reuse.

chrome/renderer/resources/extensions/enterprise_platform_keys/key.js

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-var utils = require('utils');
-
-/**
- * Enum of possible key types (subset of WebCrypto.KeyType).
- * @enum {string}
- */
-var KeyType = {
-  public: 'public',
-  private: 'private'
-};
-
-/**
- * Enum of possible key usages (subset of WebCrypto.KeyUsage).
- * @enum {string}
- */
-var KeyUsage = {
-  sign: 'sign',
-  verify: 'verify'
-};
-
-/**
- * Implementation of WebCrypto.Key used in enterprise.platformKeys.
- * @param {KeyType} type The type of the new key.
- * @param {ArrayBuffer} publicKeySpki The Subject Public Key Info in DER
- *   encoding.
- * @param {KeyAlgorithm} algorithm The algorithm identifier.
- * @param {KeyUsage[]} usages The allowed key usages.
- * @param {boolean} extractable Whether the key is extractable.
- * @constructor
- */
-var KeyImpl = function(type, publicKeySpki, algorithm, usages, extractable) {
-  this.type = type;
-  this.spki = publicKeySpki;
-  this.algorithm = algorithm;
-  this.usages = usages;
-  this.extractable = extractable;
-};
-
-var KeyBase = function() {};
-
-Object.defineProperty(KeyBase.prototype, 'algorithm', {
-  enumerable: true,
-  get: function() {
-    return utils.deepCopy(privates(this).impl.algorithm);
-  }
-});
-
-var Key = utils.expose(
-    'Key',
-    KeyImpl,
-    {superclass: KeyBase, readonly: ['extractable', 'type', 'usages']});
-
-/**
- * Returns |key|'s Subject Public Key Info. Throws an exception if |key| is not
- * a valid Key object.
- * @param {Key} key
- * @return {ArrayBuffer} The Subject Public Key Info in DER encoding of |key|.
- */
-function getSpki(key) {
-  if (!privates(key))
-    throw new Error('Invalid key object.');
-  var keyImpl = privates(key).impl;
-  if (!keyImpl || !keyImpl.spki)
-    throw new Error('Invalid key object.');
-  return keyImpl.spki;
-}
-
-exports.Key = Key;
-exports.KeyType = KeyType;
-exports.KeyUsage = KeyUsage;
-exports.getSpki = getSpki;