88 lines
2.6 KiB
JavaScript
88 lines
2.6 KiB
JavaScript
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/* prettier-ignore */
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/********************************************************************************
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* Ledger Communication toolkit
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* (c) 2016 Ledger
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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********************************************************************************/
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'use strict';
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// MEW - Require u2f instead of expecting it in global scope
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var u2f = require('./u2f-api');
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var Ledger3 = function(scrambleKey, timeoutSeconds) {
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this.scrambleKey = new Buffer(scrambleKey, 'ascii');
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this.timeoutSeconds = timeoutSeconds;
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};
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Ledger3.wrapApdu = function(apdu, key) {
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var result = new Buffer(apdu.length);
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for (var i = 0; i < apdu.length; i++) {
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result[i] = apdu[i] ^ key[i % key.length];
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}
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return result;
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};
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// Convert from normal to web-safe, strip trailing "="s
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Ledger3.webSafe64 = function(base64) {
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return base64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
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};
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// Convert from web-safe to normal, add trailing "="s
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Ledger3.normal64 = function(base64) {
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return (
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base64.replace(/\-/g, '+').replace(/_/g, '/') +
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'=='.substring(0, 3 * base64.length % 4)
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);
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};
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Ledger3.prototype.u2fCallback = function(response, callback) {
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if (typeof response['signatureData'] != 'undefined') {
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var data = new Buffer(
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Ledger3.normal64(response['signatureData']),
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'base64'
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);
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callback(data.toString('hex', 5));
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} else {
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callback(undefined, response);
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}
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};
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// callback is function(response, error)
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Ledger3.prototype.exchange = function(apduHex, callback) {
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var apdu = new Buffer(apduHex, 'hex');
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var keyHandle = Ledger3.wrapApdu(apdu, this.scrambleKey);
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var challenge = new Buffer(
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'0000000000000000000000000000000000000000000000000000000000000000',
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'hex'
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);
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var key = {};
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key['version'] = 'U2F_V2';
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key['keyHandle'] = Ledger3.webSafe64(keyHandle.toString('base64'));
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var self = this;
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var localCallback = function(result) {
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self.u2fCallback(result, callback);
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};
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u2f.sign(
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location.origin,
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Ledger3.webSafe64(challenge.toString('base64')),
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[key],
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localCallback,
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this.timeoutSeconds
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);
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};
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module.exports = Ledger3;
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