MyCrypto/common/vendor/ledger3.js

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