2016-10-25 04:16:47 +02:00
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function CryptoService(constantsService) {
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this.constantsService = constantsService;
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2016-09-04 06:34:24 +02:00
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initCryptoService();
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2016-09-03 06:03:13 +02:00
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};
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2016-09-02 06:50:57 +02:00
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2016-09-04 06:34:24 +02:00
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function initCryptoService() {
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2016-09-03 06:03:13 +02:00
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var _key,
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_b64Key,
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2016-10-25 04:16:47 +02:00
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_keyHash,
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_b64KeyHash,
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2016-12-10 16:33:58 +01:00
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_aes,
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_aesWithMac;
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2016-09-03 06:03:13 +02:00
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2016-09-05 07:49:44 +02:00
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sjcl.beware["CBC mode is dangerous because it doesn't protect message integrity."]();
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2016-09-03 06:03:13 +02:00
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CryptoService.prototype.setKey = function (key, callback) {
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2016-09-02 06:50:57 +02:00
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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2016-10-25 04:16:47 +02:00
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var self = this;
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2016-09-02 06:50:57 +02:00
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_key = key;
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2016-10-25 04:16:47 +02:00
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chrome.storage.local.get(self.constantsService.lockOptionKey, function (obj) {
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if (obj && (obj[self.constantsService.lockOptionKey] || obj[self.constantsService.lockOptionKey] === 0)) {
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// if we have a lock option set, we do not store the key
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callback();
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return;
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}
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chrome.storage.local.set({
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'key': sjcl.codec.base64.fromBits(key)
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}, function () {
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callback();
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});
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});
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}
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CryptoService.prototype.setKeyHash = function (keyHash, callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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_keyHash = sjcl.codec.base64.toBits(keyHash);
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2016-09-02 06:50:57 +02:00
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chrome.storage.local.set({
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2016-10-25 04:16:47 +02:00
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'keyHash': keyHash
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2016-09-02 06:50:57 +02:00
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}, function () {
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callback();
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});
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2016-09-03 06:03:13 +02:00
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}
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2016-09-02 06:50:57 +02:00
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2016-09-03 06:03:13 +02:00
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CryptoService.prototype.getKey = function (b64, callback) {
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2016-09-02 06:50:57 +02:00
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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if (b64 && b64 === true && _b64Key) {
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2016-10-25 04:16:47 +02:00
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callback(_b64Key);
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return;
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2016-09-02 06:50:57 +02:00
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}
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else if (!b64 && _key) {
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2016-10-25 04:16:47 +02:00
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callback(_key);
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return;
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}
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else if (b64 && b64 === true && _key && !_b64Key) {
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_b64Key = sjcl.codec.base64.fromBits(_key);
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callback(_b64Key);
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return;
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2016-09-02 06:50:57 +02:00
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}
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2016-10-25 04:16:47 +02:00
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var self = this;
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chrome.storage.local.get(self.constantsService.lockOptionKey, function (obj) {
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if (obj && (obj[self.constantsService.lockOptionKey] || obj[self.constantsService.lockOptionKey] === 0)) {
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// if we have a lock option set, we do not try to fetch the storage key since it should not even be there
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callback(null);
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return;
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2016-09-02 06:50:57 +02:00
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}
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2016-10-25 04:16:47 +02:00
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chrome.storage.local.get('key', function (obj) {
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if (obj && obj.key) {
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_key = sjcl.codec.base64.toBits(obj.key);
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if (b64 && b64 === true) {
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_b64Key = obj.key;
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callback(_b64Key);
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return;
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}
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}
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callback(_key);
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});
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});
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};
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2016-12-10 16:33:58 +01:00
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CryptoService.prototype.getEncKey = function (callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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this.getKey(false, function (key) {
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callback(key.slice(0, 4));
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});
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};
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CryptoService.prototype.getMacKey = function (callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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this.getKey(false, function (key) {
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callback(key.slice(4));
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});
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};
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2016-10-25 04:16:47 +02:00
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CryptoService.prototype.getKeyHash = function (b64, callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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if (b64 && b64 === true && _b64KeyHash) {
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callback(_b64KeyHash);
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}
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else if (!b64 && _keyHash) {
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callback(_keyHash);
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return;
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}
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else if (b64 && b64 === true && _keyHash && !_b64KeyHash) {
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_b64KeyHash = sjcl.codec.base64.fromBits(_keyHash);
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callback(_b64KeyHash);
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return;
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}
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chrome.storage.local.get('keyHash', function (obj) {
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if (obj && obj.keyHash) {
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_keyHash = sjcl.codec.base64.toBits(obj.keyHash);
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if (b64 && b64 === true) {
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_b64KeyHash = obj.keyHash;
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callback(_b64KeyHash);
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return;
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}
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2016-09-02 06:50:57 +02:00
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}
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2016-10-25 04:16:47 +02:00
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callback(_keyHash);
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2016-09-02 06:50:57 +02:00
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});
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};
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2016-09-03 06:03:13 +02:00
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CryptoService.prototype.clearKey = function (callback) {
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2016-09-02 06:50:57 +02:00
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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2016-12-10 16:33:58 +01:00
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_key = _b64Key = _aes = _aesWithMac = null;
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2016-09-02 06:50:57 +02:00
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chrome.storage.local.remove('key', function () {
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callback();
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});
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};
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2016-10-25 04:16:47 +02:00
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CryptoService.prototype.clearKeyHash = function (callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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_keyHash = _b64KeyHash = null;
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chrome.storage.local.remove('keyHash', function () {
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callback();
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});
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};
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CryptoService.prototype.toggleKey = function (callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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var self = this;
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self.getKey(false, function (key) {
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chrome.storage.local.get(self.constantsService.lockOptionKey, function (obj) {
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if (obj && (obj[self.constantsService.lockOptionKey] || obj[self.constantsService.lockOptionKey] === 0)) {
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// if we have a lock option set, clear the key
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self.clearKey(function () {
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_key = key;
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callback();
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return;
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});
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}
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else {
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// no lock option, so store the current key
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self.setKey(key, function () {
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callback();
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return;
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});
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}
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});
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});
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};
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2016-09-03 06:03:13 +02:00
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CryptoService.prototype.makeKey = function (password, salt, b64) {
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2016-09-02 06:50:57 +02:00
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var key = sjcl.misc.pbkdf2(password, salt, 5000, 256, null);
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if (b64 && b64 === true) {
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return sjcl.codec.base64.fromBits(key);
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}
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return key;
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};
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2016-09-05 06:03:49 +02:00
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CryptoService.prototype.hashPassword = function (password, key, callback) {
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this.getKey(false, function (storedKey) {
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if (!key) {
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key = storedKey;
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}
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2016-09-02 06:50:57 +02:00
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2016-09-05 06:03:49 +02:00
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if (!password || !key) {
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throw 'Invalid parameters.';
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}
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2016-09-02 06:50:57 +02:00
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2016-09-05 06:03:49 +02:00
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var hashBits = sjcl.misc.pbkdf2(key, password, 1, 256, null);
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callback(sjcl.codec.base64.fromBits(hashBits));
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});
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2016-09-02 06:50:57 +02:00
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};
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2016-09-04 06:34:24 +02:00
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CryptoService.prototype.getAes = function (callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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2016-09-02 06:50:57 +02:00
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}
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2016-09-04 06:34:24 +02:00
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this.getKey(false, function (key) {
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if (!_aes && key) {
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_aes = new sjcl.cipher.aes(key);
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}
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callback(_aes);
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});
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2016-09-02 06:50:57 +02:00
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};
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2016-12-10 16:33:58 +01:00
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CryptoService.prototype.getAesWithMac = function (callback) {
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if (!callback || typeof callback !== 'function') {
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throw 'callback function required';
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}
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this.getEncKey(function (encKey) {
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if (!_aesWithMac && encKey) {
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_aesWithMac = new sjcl.cipher.aes(encKey);
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}
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callback(_aesWithMac);
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});
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};
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2016-09-17 05:47:50 +02:00
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CryptoService.prototype.encrypt = function (plaintextValue) {
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2016-12-10 16:33:58 +01:00
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var self = this;
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2016-09-17 05:47:50 +02:00
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var deferred = Q.defer();
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2016-09-02 06:50:57 +02:00
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2016-09-05 07:49:44 +02:00
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if (plaintextValue === null || plaintextValue === undefined) {
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2016-09-17 05:47:50 +02:00
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deferred.resolve(null);
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}
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else {
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2016-12-10 16:33:58 +01:00
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self.getKey(false, function (key) {
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self.getEncKey(function (theEncKey) {
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self.getMacKey(function (macKey) {
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if (!key || !theEncKey || !macKey) {
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throw 'Encryption key unavailable.';
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}
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2016-09-17 05:47:50 +02:00
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2016-12-10 16:33:58 +01:00
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// TODO: Turn on whenever ready to support encrypt-then-mac
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var encKey = false ? theEncKey : key;
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2016-09-17 05:47:50 +02:00
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2016-12-10 16:33:58 +01:00
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var response = {};
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var params = {
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mode: 'cbc',
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iv: sjcl.random.randomWords(4, 10)
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};
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2016-09-17 05:47:50 +02:00
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2016-12-10 16:33:58 +01:00
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var ctJson = sjcl.encrypt(encKey, plaintextValue, params, response);
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2016-09-17 05:47:50 +02:00
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2016-12-10 16:33:58 +01:00
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var ct = ctJson.match(/"ct":"([^"]*)"/)[1];
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var iv = sjcl.codec.base64.fromBits(response.iv);
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var cipherString = iv + '|' + ct;
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// TODO: Turn on whenever ready to support encrypt-then-mac
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if (false) {
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var mac = computeMac(ct, response.iv, macKey);
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cipherString = cipherString + '|' + mac;
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}
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var cs = new CipherString(cipherString);
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deferred.resolve(cs);
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});
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});
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2016-09-17 05:47:50 +02:00
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});
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2016-09-05 07:49:44 +02:00
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}
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2016-09-17 05:47:50 +02:00
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return deferred.promise;
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2016-09-02 06:50:57 +02:00
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};
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2016-09-17 05:47:50 +02:00
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CryptoService.prototype.decrypt = function (cipherString) {
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var deferred = Q.defer();
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2016-12-10 16:33:58 +01:00
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var self = this;
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2016-09-02 06:50:57 +02:00
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2016-09-05 17:05:27 +02:00
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if (cipherString === null || cipherString === undefined || !cipherString.encryptedString) {
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2016-09-05 07:49:44 +02:00
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throw 'cannot decrypt nothing';
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}
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2016-12-10 16:33:58 +01:00
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self.getMacKey(function (macKey) {
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if (!macKey) {
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throw 'MAC key unavailable.';
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2016-09-04 06:34:24 +02:00
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}
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2016-12-10 16:33:58 +01:00
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self.getAes(function (aes) {
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self.getAesWithMac(function (aesWithMac) {
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if (!aes || !aesWithMac) {
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throw 'AES encryption unavailable.';
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}
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var ivBits = sjcl.codec.base64.toBits(cipherString.initializationVector);
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var ctBits = sjcl.codec.base64.toBits(cipherString.cipherText);
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2016-09-02 06:50:57 +02:00
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2016-12-10 16:33:58 +01:00
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var computedMac = null;
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if (cipherString.mac) {
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computedMac = computeMac(ctBits, ivBits, macKey);
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if (computedMac !== cipherString.mac) {
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console.error('MAC failed.');
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deferred.reject('MAC failed.');
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}
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}
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var decBits = sjcl.mode.cbc.decrypt(computedMac ? aesWithMac : aes, ctBits, ivBits, null);
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var decValue = sjcl.codec.utf8String.fromBits(decBits);
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deferred.resolve(decValue);
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});
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});
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2016-09-04 06:34:24 +02:00
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});
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2016-09-17 05:47:50 +02:00
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return deferred.promise;
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2016-09-02 06:50:57 +02:00
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};
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2016-12-10 16:33:58 +01:00
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function computeMac(ct, iv, macKey) {
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if (typeof ct === 'string') {
|
|
|
|
ct = sjcl.codec.base64.toBits(ct);
|
|
|
|
}
|
|
|
|
if (typeof iv === 'string') {
|
|
|
|
iv = sjcl.codec.base64.toBits(iv);
|
|
|
|
}
|
|
|
|
|
|
|
|
var hmac = new sjcl.misc.hmac(macKey, sjcl.hash.sha256);
|
|
|
|
var bits = iv.concat(ct);
|
|
|
|
var mac = hmac.encrypt(bits);
|
|
|
|
return sjcl.codec.base64.fromBits(mac);
|
|
|
|
}
|
2016-09-04 06:34:24 +02:00
|
|
|
};
|