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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
import { CommonUtils } from "resource://services-common/utils.sys.mjs";
import { Log } from "resource://gre/modules/Log.sys.mjs";
import { Weave } from "resource://services-sync/main.sys.mjs";
/**
* Represents a pair of keys.
*
* Each key stored in a key bundle is 256 bits. One key is used for symmetric
* encryption. The other is used for HMAC.
*
* A KeyBundle by itself is just an anonymous pair of keys. Other types
* deriving from this one add semantics, such as associated collections or
* generating a key bundle via HKDF from another key.
*/
function KeyBundle() {
this._encrypt = null;
this._encryptB64 = null;
this._hmac = null;
this._hmacB64 = null;
}
KeyBundle.prototype = {
_encrypt: null,
_encryptB64: null,
_hmac: null,
_hmacB64: null,
equals: function equals(bundle) {
return (
bundle &&
bundle.hmacKey == this.hmacKey &&
bundle.encryptionKey == this.encryptionKey
);
},
/*
* Accessors for the two keys.
*/
get encryptionKey() {
return this._encrypt;
},
set encryptionKey(value) {
if (!value || typeof value != "string") {
throw new Error("Encryption key can only be set to string values.");
}
if (value.length < 16) {
throw new Error("Encryption key must be at least 128 bits long.");
}
this._encrypt = value;
this._encryptB64 = btoa(value);
},
get encryptionKeyB64() {
return this._encryptB64;
},
get hmacKey() {
return this._hmac;
},
set hmacKey(value) {
if (!value || typeof value != "string") {
throw new Error("HMAC key can only be set to string values.");
}
if (value.length < 16) {
throw new Error("HMAC key must be at least 128 bits long.");
}
this._hmac = value;
this._hmacB64 = btoa(value);
},
get hmacKeyB64() {
return this._hmacB64;
},
/**
* Populate this key pair with 2 new, randomly generated keys.
*/
async generateRandom() {
// Compute both at that same time
let [generatedHMAC, generatedEncr] = await Promise.all([
Weave.Crypto.generateRandomKey(),
Weave.Crypto.generateRandomKey(),
]);
this.keyPairB64 = [generatedEncr, generatedHMAC];
},
};
/**
* Represents a KeyBundle associated with a collection.
*
* This is just a KeyBundle with a collection attached.
*/
export function BulkKeyBundle(collection) {
let log = Log.repository.getLogger("Sync.BulkKeyBundle");
log.info("BulkKeyBundle being created for " + collection);
KeyBundle.call(this);
this._collection = collection;
}
BulkKeyBundle.fromHexKey = function (hexKey) {
let key = CommonUtils.hexToBytes(hexKey);
let bundle = new BulkKeyBundle();
// [encryptionKey, hmacKey]
bundle.keyPair = [key.slice(0, 32), key.slice(32, 64)];
return bundle;
};
BulkKeyBundle.fromJWK = function (jwk) {
if (!jwk || !jwk.k || jwk.kty !== "oct") {
throw new Error("Invalid JWK provided to BulkKeyBundle.fromJWK");
}
return BulkKeyBundle.fromHexKey(CommonUtils.base64urlToHex(jwk.k));
};
BulkKeyBundle.prototype = {
get collection() {
return this._collection;
},
/**
* Obtain the key pair in this key bundle.
*
* The returned keys are represented as raw byte strings.
*/
get keyPair() {
return [this.encryptionKey, this.hmacKey];
},
set keyPair(value) {
if (!Array.isArray(value) || value.length != 2) {
throw new Error("BulkKeyBundle.keyPair value must be array of 2 keys.");
}
this.encryptionKey = value[0];
this.hmacKey = value[1];
},
get keyPairB64() {
return [this.encryptionKeyB64, this.hmacKeyB64];
},
set keyPairB64(value) {
if (!Array.isArray(value) || value.length != 2) {
throw new Error(
"BulkKeyBundle.keyPairB64 value must be an array of 2 keys."
);
}
this.encryptionKey = CommonUtils.safeAtoB(value[0]);
this.hmacKey = CommonUtils.safeAtoB(value[1]);
},
};
Object.setPrototypeOf(BulkKeyBundle.prototype, KeyBundle.prototype);
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