streaming_protection_vo_ClearKeyKeySet.js
/**
* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @classdesc A collection of ClearKey encryption keys with an (optional) associated
* type
* @ignore
*/
class ClearKeyKeySet {
/**
* @param {Array.<KeyPair>} keyPairs
* @param {string} type the type of keys in this set. One of either 'persistent'
* or 'temporary'. Can also be null or undefined.
* @class
* @ignore
*/
constructor(keyPairs, type) {
if (type && type !== 'persistent' && type !== 'temporary')
throw new Error('Invalid ClearKey key set type! Must be one of \'persistent\' or \'temporary\'');
this.keyPairs = keyPairs;
this.type = type;
}
/**
* Convert this key set to its JSON Web Key (JWK) representation
*
* @return {ArrayBuffer} JWK object UTF-8 encoded as ArrayBuffer
*/
toJWK() {
let i;
let numKeys = this.keyPairs.length;
let jwk = {keys: []};
for (i = 0; i < numKeys; i++) {
let key = {
kty: 'oct',
alg: 'A128KW',
kid: this.keyPairs[i].keyID,
k: this.keyPairs[i].key
};
jwk.keys.push(key);
}
if (this.type) {
jwk.type = this.type;
}
let jwkString = JSON.stringify(jwk);
const len = jwkString.length;
// Convert JSON string to ArrayBuffer
let buf = new ArrayBuffer(len);
let bView = new Uint8Array(buf);
for (i = 0; i < len; i++)
bView[i] = jwkString.charCodeAt(i);
return buf;
}
}
export default ClearKeyKeySet;