//
// Copyright (c) Microsoft and contributors. All rights reserved.
//
// 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.
//
// Module dependencies.
var crypto = require('crypto');
/**
* Creates a new HmacSHA256Sign object.
*
* @constructor
*/
function HmacSha256Sign(accessKey) {
this._accessKey = accessKey;
this._decodedAccessKey = new Buffer(this._accessKey, 'base64');
}
/**
* Computes a signature for the specified string using the HMAC-SHA256 algorithm.
*
* @param {string} stringToSign The UTF-8-encoded string to sign.
* @return A String that contains the HMAC-SHA256-encoded signature.
*/
HmacSha256Sign.prototype.sign = function (stringToSign) {
// Encoding the Signature
// Signature=Base64(HMAC-SHA256(UTF8(StringToSign)))
return crypto.createHmac('sha256', this._decodedAccessKey).update(stringToSign, 'utf-8').digest('base64');
};
module.exports = HmacSha256Sign; |