1124 lines
37 KiB
JavaScript
1124 lines
37 KiB
JavaScript
/*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* START CRAP TO BE DELETED */
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//TODO: Stolen from MDN (copyright...)
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function b64ToUint6 (nChr) {
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return nChr > 64 && nChr < 91 ?
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nChr - 65
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: nChr > 96 && nChr < 123 ?
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nChr - 71
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: nChr > 47 && nChr < 58 ?
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nChr + 4
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: nChr === 43 ?
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62
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: nChr === 47 ?
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63
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:
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0;
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}
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function base64DecToArr (sBase64, nBlocksSize) {
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var
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sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length,
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nOutLen = nBlocksSize ? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize : nInLen * 3 + 1 >> 2;
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var aBBytes = new ArrayBuffer(nOutLen);
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var taBytes = new Uint8Array(aBBytes);
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for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
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nMod4 = nInIdx & 3;
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nUint24 |= b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4;
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if (nMod4 === 3 || nInLen - nInIdx === 1) {
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for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
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taBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255;
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}
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nUint24 = 0;
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}
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}
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return aBBytes;
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}
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/* Base64 string to array encoding */
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function uint6ToB64 (nUint6) {
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return nUint6 < 26 ?
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nUint6 + 65
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: nUint6 < 52 ?
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nUint6 + 71
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: nUint6 < 62 ?
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nUint6 - 4
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: nUint6 === 62 ?
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43
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: nUint6 === 63 ?
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47
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:
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65;
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}
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function base64EncArr (aBytes) {
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var nMod3, sB64Enc = "";
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for (var nLen = aBytes.length, nUint24 = 0, nIdx = 0; nIdx < nLen; nIdx++) {
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nMod3 = nIdx % 3;
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//if (nIdx > 0 && (nIdx * 4 / 3) % 76 === 0) { sB64Enc += "\r\n"; }
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nUint24 |= aBytes[nIdx] << (16 >>> nMod3 & 24);
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if (nMod3 === 2 || aBytes.length - nIdx === 1) {
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sB64Enc += String.fromCharCode(uint6ToB64(nUint24 >>> 18 & 63), uint6ToB64(nUint24 >>> 12 & 63), uint6ToB64(nUint24 >>> 6 & 63), uint6ToB64(nUint24 & 63));
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nUint24 = 0;
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}
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}
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return sB64Enc.replace(/A(?=A$|$)/g, "=");
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}
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/* END CRAP TO BE DELETED */
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var USE_NACL = false;
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/*********************************
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*** Type conversion utilities ***
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*********************************/
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function intToArrayBuffer(nInt) {
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var res = new ArrayBuffer(4);
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var thing = new Uint8Array(res);
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thing[0] = (nInt >> 24) & 0xff;
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thing[1] = (nInt >> 16) & 0xff;
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thing[2] = (nInt >> 8 ) & 0xff;
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thing[3] = (nInt >> 0 ) & 0xff;
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return res;
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}
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// Strings/arrays
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//TODO: Throw all this shit in favor of consistent types
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var StaticByteBufferProto = new dcodeIO.ByteBuffer().__proto__;
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var StaticArrayBufferProto = new ArrayBuffer().__proto__;
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var StaticUint8ArrayProto = new Uint8Array().__proto__;
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var StaticWordArrayProto = CryptoJS.lib.WordArray.create('').__proto__;
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function getString(thing) {
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if (thing === Object(thing)) {
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if (thing.__proto__ == StaticUint8ArrayProto)
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return String.fromCharCode.apply(null, thing);
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if (thing.__proto__ == StaticArrayBufferProto)
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return getString(new Uint8Array(thing));
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if (thing.__proto__ == StaticByteBufferProto)
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return thing.toString("binary");
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if (thing.__proto__ == StaticWordArrayProto)
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return thing.toString(CryptoJS.enc.Latin1);
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}
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return thing;
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}
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function getStringable(thing) {
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return (typeof thing == "string" || typeof thing == "number" || typeof thing == "boolean" ||
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(thing === Object(thing) &&
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(thing.__proto__ == StaticArrayBufferProto ||
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thing.__proto__ == StaticUint8ArrayProto ||
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thing.__proto__ == StaticByteBufferProto ||
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thing.__proto__ == StaticWordArrayProto)));
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}
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function toArrayBuffer(thing) {
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//TODO: Optimize this for specific cases
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if (thing === undefined)
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return undefined;
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if (thing === Object(thing) && thing.__proto__ == StaticArrayBufferProto)
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return thing;
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if (thing instanceof Array) {
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// Assuming Uint16Array from curve25519
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var res = new ArrayBuffer(thing.length * 2);
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var uint = new Uint16Array(res);
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for (var i = 0; i < thing.length; i++)
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uint[i] = thing[i];
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return res;
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}
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if (!getStringable(thing))
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throw new Error("Tried to convert a non-stringable thing of type " + typeof thing + " to an array buffer");
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var str = getString(thing);
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var res = new ArrayBuffer(str.length);
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var uint = new Uint8Array(res);
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for (var i = 0; i < str.length; i++)
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uint[i] = str.charCodeAt(i);
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return res;
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}
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function assertIsArrayBuffer(thing) {
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if (thing !== Object(thing) || thing.__proto__ != StaticArrayBufferProto)
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console.log("WARNING: Needed a ArrayBuffer");
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return toArrayBuffer(thing);
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}
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function ensureStringed(thing) {
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if (getStringable(thing))
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return getString(thing);
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else if (thing instanceof Array) {
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var res = [];
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for (var i = 0; i < thing.length; i++)
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res[i] = ensureStringed(thing[i]);
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return res;
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} else if (thing === Object(thing)) {
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var res = {};
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for (key in thing)
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res[key] = ensureStringed(thing[key]);
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return res;
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}
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throw new Error("unsure of how to jsonify object of type " + typeof thing);
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}
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function jsonThing(thing) {
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return JSON.stringify(ensureStringed(thing));
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}
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function getArrayBuffer(string) {
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return base64DecToArr(btoa(string));
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}
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function base64ToArrayBuffer(string) {
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return base64DecToArr(string);
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}
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// Protobuf decodingA
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//TODO: throw on missing fields everywhere
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var IncomingPushMessageProtobuf = dcodeIO.ProtoBuf.loadProtoFile("protos/IncomingPushMessageSignal.proto").build("textsecure.IncomingPushMessageSignal");
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function decodeIncomingPushMessageProtobuf(string) {
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return IncomingPushMessageProtobuf.decode(btoa(string));
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}
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var PushMessageContentProtobuf = dcodeIO.ProtoBuf.loadProtoFile("protos/IncomingPushMessageSignal.proto").build("textsecure.PushMessageContent");
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function decodePushMessageContentProtobuf(string) {
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return PushMessageContentProtobuf.decode(btoa(string));
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}
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var WhisperMessageProtobuf = dcodeIO.ProtoBuf.loadProtoFile("protos/WhisperTextProtocol.proto").build("textsecure.WhisperMessage");
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function decodeWhisperMessageProtobuf(string) {
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return WhisperMessageProtobuf.decode(btoa(string));
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}
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var PreKeyWhisperMessageProtobuf = dcodeIO.ProtoBuf.loadProtoFile("protos/WhisperTextProtocol.proto").build("textsecure.PreKeyWhisperMessage");
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function decodePreKeyWhisperMessageProtobuf(string) {
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return PreKeyWhisperMessageProtobuf.decode(btoa(string));
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}
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var KeyExchangeMessageProtobuf = dcodeIO.ProtoBuf.loadProtoFile("protos/WhisperTextProtocol.proto").build("textsecure.KeyExchangeMessage");
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function decodeKeyExchangeMessageProtobuf(string) {
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return KeyExchangeMessageProtobuf.decode(btoa(string));
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}
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// Number formatting
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function getNumberFromString(string) {
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return string.split(".")[0];
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}
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function getEncodedNumber(number) {
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var split = number.split(".");
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if (split.length > 1) {
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if (split[1] == 1)
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return split[0];
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else
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return number;
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} else
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return number;
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}
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function verifyNumber(string) {
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//TODO: fancy country-code guessing and number verification
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return getEncodedNumber(string.trim());
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}
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function getDeviceId(encodedNumber) {
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var split = encodedNumber.split(".");
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if (split.length > 1)
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return split[1];
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return 1;
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}
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// Other
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function timestampToHumanReadable(timestamp) {
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var date = new Date();
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date.setTime(timestamp*1000);
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return date.toUTCString();
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}
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function objectContainsKeys(object) {
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var count = 0;
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for (key in object) {
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count++;
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break;
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}
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return count != 0;
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}
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/************************************************
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*** Utilities to store data in local storage ***
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************************************************/
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var storage = {};
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storage.putEncrypted = function(key, value) {
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//TODO
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if (value === undefined)
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throw new Error("Tried to store undefined");
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localStorage.setItem("e" + key, jsonThing(value));
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}
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storage.getEncrypted = function(key, defaultValue) {
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//TODO
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var value = localStorage.getItem("e" + key);
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if (value === null)
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return defaultValue;
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return JSON.parse(value);
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}
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storage.removeEncrypted = function(key) {
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localStorage.removeItem("e" + key);
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}
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storage.putUnencrypted = function(key, value) {
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if (value === undefined)
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throw new Error("Tried to store undefined");
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localStorage.setItem("u" + key, jsonThing(value));
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}
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storage.getUnencrypted = function(key, defaultValue) {
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var value = localStorage.getItem("u" + key);
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if (value === null)
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return defaultValue;
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return JSON.parse(value);
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}
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storage.removeUnencrypted = function(key) {
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localStorage.removeItem("u" + key);
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}
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function registrationDone() {
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storage.putUnencrypted("registration_done", "");
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//TODO: Fix dirty hack:
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chrome.runtime.reload();
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}
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function isRegistrationDone() {
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return storage.getUnencrypted("registration_done") !== undefined;
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}
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function getMessageMap() {
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return storage.getEncrypted("messageMap", {});
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}
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function storeMessage(messageObject) {
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var messageMap = getMessageMap();
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var conversation = messageMap[messageObject.pushMessage.source]; //TODO: Also support Group message IDs here
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if (conversation === undefined) {
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conversation = [];
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messageMap[messageObject.pushMessage.source] = conversation;
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}
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conversation[conversation.length] = { message: getString(messageObject.message.body),
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sender: messageObject.pushMessage.source,
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timestamp: messageObject.pushMessage.timestamp.div(dcodeIO.Long.fromNumber(1000)).toNumber() };
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storage.putEncrypted("messageMap", messageMap);
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chrome.runtime.sendMessage(conversation[conversation.length - 1]);
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}
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function getDeviceObject(encodedNumber) {
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return storage.getEncrypted("deviceObject" + getEncodedNumber(encodedNumber));
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}
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function getDeviceIdListFromNumber(number) {
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return storage.getEncrypted("deviceIdList" + getNumberFromString(number), []);
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}
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function addDeviceIdForNumber(number, deviceId) {
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var deviceIdList = getDeviceIdListFromNumber(getNumberFromString(number));
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for (var i = 0; i < deviceIdList.length; i++) {
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if (deviceIdList[i] == deviceId)
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return;
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}
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deviceIdList[deviceIdList.length] = deviceId;
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storage.putEncrypted("deviceIdList" + getNumberFromString(number), deviceIdList);
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}
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// throws "Identity key mismatch"
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function saveDeviceObject(deviceObject) {
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var existing = getDeviceObject(deviceObject.encodedNumber);
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if (existing === undefined)
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existing = {encodedNumber: getEncodedNumber(deviceObject.encodedNumber)};
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for (key in deviceObject) {
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if (key == "encodedNumber")
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continue;
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if (key == "identityKey" && deviceObject.identityKey != deviceObject.identityKey)
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throw new Error("Identity key mismatch");
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existing[key] = deviceObject[key];
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}
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storage.putEncrypted("deviceObject" + getEncodedNumber(deviceObject.encodedNumber), existing);
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addDeviceIdForNumber(deviceObject.encodedNumber, getDeviceId(deviceObject.encodedNumber));
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}
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function getDeviceObjectListFromNumber(number) {
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var deviceObjectList = [];
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var deviceIdList = getDeviceIdListFromNumber(number);
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for (var i = 0; i < deviceIdList.length; i++)
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deviceObjectList[deviceObjectList.length] = getDeviceObject(getNumberFromString(number) + "." + deviceIdList[i]);
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return deviceObjectList;
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}
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/**********************
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*** NaCL Interface ***
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**********************/
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var onLoadCallbacks = [];
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var naclLoaded = 0;
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function registerOnLoadFunction(func) {
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if (naclLoaded || !USE_NACL) {
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func();
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return;
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}
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onLoadCallbacks[onLoadCallbacks.length] = func;
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}
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var naclMessageNextId = 0;
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var naclMessageIdCallbackMap = {};
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function moduleDidLoad() {
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common.hideModule();
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naclLoaded = 1;
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for (var i = 0; i < onLoadCallbacks.length; i++)
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onLoadCallbacks[i]();
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onLoadCallbacks = [];
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}
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function handleMessage(message) {
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naclMessageIdCallbackMap[message.data.call_id](message.data);
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}
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function postNaclMessage(message, callback) {
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if (!USE_NACL)
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throw new Error("Attempted to make NaCL call with !USE_NACL?");
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naclMessageIdCallbackMap[naclMessageNextId] = callback;
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message.call_id = naclMessageNextId++;
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common.naclModule.postMessage(message);
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}
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/*******************************************
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*** Utilities to manage keys/randomness ***
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*******************************************/
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function getRandomBytes(size) {
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//TODO: Better random (https://www.grc.com/r&d/js.htm?)
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try {
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var buffer = new ArrayBuffer(size);
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var array = new Uint8Array(buffer);
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window.crypto.getRandomValues(array);
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return buffer;
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} catch (err) {
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//TODO: ummm...wat?
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throw err;
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}
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}
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// functions exposed for replacement and direct calling in test code
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var crypto_tests = {};
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(function(crypto, $, undefined) {
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crypto_tests.privToPub = function(privKey, isIdentity) {
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if (privKey.byteLength != 32)
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throw new Error("Invalid private key");
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var prependVersion = function(pubKey) {
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var origPub = new Uint8Array(pubKey);
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var pub = new ArrayBuffer(33);
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var pubWithPrefix = new Uint8Array(pub);
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for (var i = 0; i < 32; i++)
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pubWithPrefix[i+1] = origPub[i];
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pubWithPrefix[0] = 5;
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return pub;
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}
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if (USE_NACL) {
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return new Promise(function(resolve) {
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postNaclMessage({command: "bytesToPriv", priv: privKey}, function(message) {
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var priv = message.res;
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if (!isIdentity)
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new Uint8Array(priv)[0] |= 0x01;
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postNaclMessage({command: "privToPub", priv: priv}, function(message) {
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resolve({ pubKey: prependVersion(message.res), privKey: priv });
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});
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});
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});
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} else {
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privKey = privKey.slice(0);
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var priv = new Uint16Array(privKey);
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priv[0] &= 0xFFF8;
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priv[15] = (priv[15] & 0x7FFF) | 0x4000;
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if (!isIdentity)
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priv[0] |= 0x0001;
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//TODO: fscking type conversion
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return new Promise(function(resolve) { resolve({ pubKey: prependVersion(toArrayBuffer(curve25519(priv))), privKey: privKey}); });
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}
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}
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var privToPub = function(privKey, isIdentity, callback) { return crypto_tests.privToPub(privKey, isIdentity, callback); }
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crypto_tests.createNewKeyPair = function(isIdentity) {
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return privToPub(getRandomBytes(32), isIdentity);
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}
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var createNewKeyPair = function(isIdentity) { return crypto_tests.createNewKeyPair(isIdentity); }
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var crypto_storage = {};
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crypto_storage.getNewPubKeySTORINGPrivKey = function(keyName, isIdentity, callback) {
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createNewKeyPair(isIdentity).then(function(keyPair) {
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storage.putEncrypted("25519Key" + keyName, keyPair);
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callback(keyPair.pubKey);
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});
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}
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crypto_storage.getStoredPubKey = function(keyName) {
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return toArrayBuffer(storage.getEncrypted("25519Key" + keyName, { pubKey: undefined }).pubKey);
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}
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crypto_storage.getStoredKeyPair = function(keyName) {
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var res = storage.getEncrypted("25519Key" + keyName);
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if (res === undefined)
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return undefined;
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return { pubKey: toArrayBuffer(res.pubKey), privKey: toArrayBuffer(res.privKey) };
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}
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crypto_storage.getAndRemoveStoredKeyPair = function(keyName) {
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var keyPair = this.getStoredKeyPair(keyName);
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storage.removeEncrypted("25519Key" + keyName);
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return keyPair;
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}
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|
|
crypto_storage.getAndRemovePreKeyPair = function(keyId) {
|
|
return this.getAndRemoveStoredKeyPair("preKey" + keyId);
|
|
}
|
|
|
|
crypto_storage.getIdentityPrivKey = function() {
|
|
return this.getStoredKeyPair("identityKey").privKey;
|
|
}
|
|
|
|
crypto_storage.saveSession = function(encodedNumber, session) {
|
|
storage.putEncrypted("session" + getEncodedNumber(encodedNumber), session);
|
|
}
|
|
|
|
crypto_storage.getSession = function(encodedNumber) {
|
|
return storage.getEncrypted("session" + getEncodedNumber(encodedNumber));
|
|
}
|
|
|
|
|
|
/*****************************
|
|
*** Internal Crypto stuff ***
|
|
*****************************/
|
|
//TODO: Think about replacing CryptoJS stuff with optional NaCL-based implementations
|
|
// Probably means all of the low-level crypto stuff here needs pulled out into its own file
|
|
crypto_tests.ECDHE = function(pubKey, privKey) {
|
|
if (privKey !== undefined) {
|
|
privKey = toArrayBuffer(privKey);
|
|
if (privKey.byteLength != 32)
|
|
throw new Error("Invalid private key");
|
|
} else
|
|
throw new Error("Invalid private key");
|
|
|
|
if (pubKey !== undefined) {
|
|
pubKey = toArrayBuffer(pubKey);
|
|
var pubView = new Uint8Array(pubKey);
|
|
if (pubKey.byteLength == 33 && pubView[0] == 5) {
|
|
pubKey = new ArrayBuffer(32);
|
|
var pubCopy = new Uint8Array(pubKey);
|
|
for (var i = 0; i < 32; i++)
|
|
pubCopy[i] = pubView[i+1];
|
|
} else if (pubKey.byteLength != 32)
|
|
throw new Error("Invalid public key");
|
|
}
|
|
|
|
return new Promise(function(resolve) {
|
|
if (USE_NACL) {
|
|
postNaclMessage({command: "ECDHE", priv: privKey, pub: pubKey}, function(message) {
|
|
resolve(message.res);
|
|
});
|
|
} else {
|
|
resolve(toArrayBuffer(curve25519(new Uint16Array(privKey), new Uint16Array(pubKey))));
|
|
}
|
|
});
|
|
}
|
|
var ECDHE = function(pubKey, privKey) { return crypto_tests.ECDHE(pubKey, privKey); }
|
|
|
|
crypto_tests.HKDF = function(input, salt, info) {
|
|
// Specific implementation of RFC 5869 that only returns exactly 64 bytes
|
|
return HmacSHA256(salt, input).then(function(PRK) {
|
|
var infoString = getString(info);
|
|
// TextSecure implements a slightly tweaked version of RFC 5869: the 0 and 1 should be 1 and 2 here
|
|
return HmacSHA256(PRK, infoString + String.fromCharCode(0)).then(function(T1) {
|
|
return HmacSHA256(PRK, getString(T1) + infoString + String.fromCharCode(1)).then(function(T2) {
|
|
return [ T1, T2 ];
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
var HKDF = function(input, salt, info) {
|
|
// HKDF for TextSecure has a bit of additional handling - salts always end up being 32 bytes
|
|
if (salt == '') {
|
|
salt = new ArrayBuffer(32);
|
|
var uintKey = new Uint8Array(salt);
|
|
for (var i = 0; i < 32; i++)
|
|
uintKey[i] = 0;
|
|
}
|
|
|
|
salt = toArrayBuffer(salt);
|
|
|
|
if (salt.byteLength != 32)
|
|
throw new Error("Got salt of incorrect length");
|
|
|
|
return crypto_tests.HKDF(input, salt, info);
|
|
}
|
|
|
|
var verifyMACWithVersionByte = function(data, key, mac, version) {
|
|
if (version === undefined)
|
|
version = 1;
|
|
|
|
return HmacSHA256(key, String.fromCharCode(version) + getString(data)).then(function(calculated_mac) {
|
|
var macString = getString(mac);
|
|
|
|
if (calculated_mac.substring(0, macString.length) != macString)
|
|
throw new Error("Bad MAC");
|
|
});
|
|
}
|
|
|
|
var calculateMACWithVersionByte = function(data, key, version) {
|
|
if (version === undefined)
|
|
version = 1;
|
|
|
|
return HmacSHA256(key, String.fromCharCode(version) + getString(data));
|
|
}
|
|
|
|
/******************************
|
|
*** Ratchet implementation ***
|
|
******************************/
|
|
var calculateRatchet = function(session, remoteKey, sending) {
|
|
var ratchet = session.currentRatchet;
|
|
|
|
return ECDHE(remoteKey, ratchet.ephemeralKeyPair.privKey).then(function(sharedSecret) {
|
|
return HKDF(sharedSecret, ratchet.rootKey, "WhisperRatchet").then(function(masterKey) {
|
|
if (sending)
|
|
session[getString(ratchet.ephemeralKeyPair.pubKey)] = { messageKeys: {}, chainKey: { counter: -1, key: masterKey[1] } };
|
|
else
|
|
session[getString(remoteKey)] = { messageKeys: {}, chainKey: { counter: -1, key: masterKey[1] } };
|
|
ratchet.rootKey = masterKey[0];
|
|
});
|
|
});
|
|
}
|
|
|
|
var initSession = function(isInitiator, ourEphemeralKey, encodedNumber, theirIdentityPubKey, theirEphemeralPubKey) {
|
|
var ourIdentityPrivKey = crypto_storage.getIdentityPrivKey();
|
|
|
|
var sharedSecret;
|
|
return ECDHE(theirEphemeralPubKey, ourIdentityPrivKey).then(function(ecRes) {
|
|
sharedSecret = getString(ecRes);
|
|
|
|
function finishInit() {
|
|
return ECDHE(theirEphemeralPubKey, ourEphemeralKey.privKey).then(function(ecRes) {
|
|
sharedSecret += getString(ecRes);
|
|
|
|
return HKDF(toArrayBuffer(sharedSecret), '', "WhisperText").then(function(masterKey) {
|
|
var session = {currentRatchet: { rootKey: masterKey[0], lastRemoteEphemeralKey: theirEphemeralPubKey },
|
|
oldRatchetList: []
|
|
};
|
|
|
|
// If we're initiating we go ahead and set our first sending ephemeral key now,
|
|
// otherwise we figure it out when we first maybeStepRatchet with the remote's ephemeral key
|
|
if (isInitiator) {
|
|
return createNewKeyPair(false).then(function(ourSendingEphemeralKey) {
|
|
session.currentRatchet.ephemeralKeyPair = ourSendingEphemeralKey;
|
|
return calculateRatchet(session, theirEphemeralPubKey, true).then(function() {
|
|
crypto_storage.saveSession(encodedNumber, session);
|
|
});
|
|
});
|
|
} else {
|
|
session.currentRatchet.ephemeralKeyPair = ourEphemeralKey;
|
|
crypto_storage.saveSession(encodedNumber, session);
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
if (isInitiator)
|
|
return ECDHE(theirIdentityPubKey, ourEphemeralKey.privKey).then(function(ecRes) {
|
|
sharedSecret = sharedSecret + getString(ecRes);
|
|
}).then(finishInit);
|
|
else
|
|
return ECDHE(theirIdentityPubKey, ourEphemeralKey.privKey).then(function(ecRes) {
|
|
sharedSecret = getString(ecRes) + sharedSecret;
|
|
}).then(finishInit);
|
|
});
|
|
}
|
|
|
|
var initSessionFromPreKeyWhisperMessage = function(encodedNumber, message) {
|
|
//TODO: Check remote identity key matches known-good key
|
|
|
|
var preKeyPair = crypto_storage.getAndRemovePreKeyPair(message.preKeyId);
|
|
if (preKeyPair === undefined) {
|
|
if (crypto_storage.getSession(encodedNumber) !== undefined)
|
|
return new Promise(function(resolve) { resolve() });
|
|
else
|
|
throw new Error("Missing preKey for PreKeyWhisperMessage");
|
|
} else
|
|
return initSession(false, preKeyPair, encodedNumber, message.identityKey, message.baseKey);
|
|
}
|
|
|
|
var fillMessageKeys = function(chain, counter) {
|
|
if (chain.chainKey.counter + 1000 < counter) //TODO: maybe 1000 is too low/high in some cases?
|
|
return new Promise(function(resolve) { resolve() }); // Stalker, much?
|
|
|
|
if (chain.chainKey.counter < counter) {
|
|
return HmacSHA256(chain.chainKey.key, String.fromCharCode(1)).then(function(mac) {
|
|
return HmacSHA256(chain.chainKey.key, String.fromCharCode(2)).then(function(key) {
|
|
chain.messageKeys[chain.chainKey.counter + 1] = mac;
|
|
chain.chainKey.key = key
|
|
chain.chainKey.counter += 1;
|
|
return fillMessageKeys(chain, counter);
|
|
});
|
|
});
|
|
} else
|
|
return new Promise(function(resolve) { resolve() });
|
|
}
|
|
|
|
var maybeStepRatchet = function(session, remoteKey, previousCounter) {
|
|
if (session[getString(remoteKey)] !== undefined)
|
|
return new Promise(function(resolve) { resolve() });
|
|
|
|
var ratchet = session.currentRatchet;
|
|
|
|
var finish = function() {
|
|
return calculateRatchet(session, remoteKey, false).then(function() {
|
|
// Now swap the ephemeral key and calculate the new sending chain
|
|
var previousRatchet = getString(ratchet.ephemeralKeyPair.pubKey);
|
|
if (session[previousRatchet] !== undefined) {
|
|
ratchet.previousCounter = session[previousRatchet].chainKey.counter;
|
|
delete session[getString(ratchet.ephemeralKeyPair.pubKey)];
|
|
} else
|
|
// TODO: This is just an idiosyncrasy upstream, which we match for testing
|
|
// it should be changed upstream to something more reasonable.
|
|
ratchet.previousCounter = 4294967295;
|
|
|
|
return createNewKeyPair(false).then(function(keyPair) {
|
|
ratchet.ephemeralKeyPair = keyPair;
|
|
return calculateRatchet(session, remoteKey, true).then(function() {
|
|
ratchet.lastRemoteEphemeralKey = remoteKey;
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
var previousRatchet = session[getString(ratchet.lastRemoteEphemeralKey)];
|
|
if (previousRatchet !== undefined) {
|
|
return fillMessageKeys(previousRatchet, previousCounter).then(function() {
|
|
if (!objectContainsKeys(previousRatchet.messageKeys))
|
|
delete session[getString(ratchet.lastRemoteEphemeralKey)];
|
|
else
|
|
session.oldRatchetList[session.oldRatchetList.length] = { added: new Date().getTime(), ephemeralKey: ratchet.lastRemoteEphemeralKey };
|
|
}).then(finish);
|
|
} else
|
|
return finish();
|
|
}
|
|
|
|
// returns decrypted protobuf
|
|
var decryptWhisperMessage = function(encodedNumber, messageBytes) {
|
|
var session = crypto_storage.getSession(encodedNumber);
|
|
if (session === undefined)
|
|
throw new Error("No session currently open with " + encodedNumber);
|
|
|
|
if (messageBytes[0] != String.fromCharCode((2 << 4) | 2))
|
|
throw new Error("Bad version number on WhisperMessage");
|
|
|
|
var messageProto = messageBytes.substring(1, messageBytes.length - 8);
|
|
var mac = messageBytes.substring(messageBytes.length - 8, messageBytes.length);
|
|
|
|
var message = decodeWhisperMessageProtobuf(messageProto);
|
|
|
|
return maybeStepRatchet(session, message.ephemeralKey, message.previousCounter).then(function() {
|
|
var chain = session[getString(message.ephemeralKey)];
|
|
|
|
return fillMessageKeys(chain, message.counter).then(function() {
|
|
return HKDF(chain.messageKeys[message.counter], '', "WhisperMessageKeys").then(function(keys) {
|
|
delete chain.messageKeys[message.counter];
|
|
|
|
verifyMACWithVersionByte(messageProto, keys[1], mac, (2 << 4) | 2);
|
|
var iv = getString(intToArrayBuffer(message.counter));
|
|
return decryptAESCTR(message.ciphertext, keys[0], iv).then(function(plaintext) {
|
|
//TODO: removeOldChains(session);
|
|
delete session['pendingPreKey'];
|
|
|
|
crypto_storage.saveSession(encodedNumber, session);
|
|
return decodePushMessageContentProtobuf(getString(plaintext));
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
/*************************
|
|
*** Public crypto API ***
|
|
*************************/
|
|
// Decrypts message into a raw string
|
|
crypto.decryptWebsocketMessage = function(message) {
|
|
var signaling_key = storage.getEncrypted("signaling_key"); //TODO: in crypto_storage
|
|
var aes_key = signaling_key.substring(0, 32);
|
|
var mac_key = signaling_key.substring(32, 32 + 20);
|
|
|
|
var decodedMessage = new Uint8Array(base64DecToArr(getString(message)));
|
|
if (decodedMessage[0] != 1)
|
|
throw new Error("Got bad version number: " + decodedMessage[0]);
|
|
|
|
var iv = decodedMessage.subarray(1, 1 + 16);
|
|
var ciphertext = decodedMessage.subarray(1 + 16, decodedMessage.length - 10);
|
|
var ivAndCipherText = decodedMessage.subarray(1, decodedMessage.length - 10);
|
|
var mac = decodedMessage.subarray(decodedMessage.length - 10, decodedMessage.length);
|
|
|
|
return verifyMACWithVersionByte(ivAndCipherText, mac_key, mac).then(function() {
|
|
return decryptAESCBC(ciphertext, aes_key, iv);
|
|
});
|
|
};
|
|
|
|
crypto.handleIncomingPushMessageProto = function(proto, callback) {
|
|
switch(proto.type) {
|
|
case 0: //TYPE_MESSAGE_PLAINTEXT
|
|
callback({message: decodePushMessageContentProtobuf(getString(proto.message)), pushMessage:proto});
|
|
break;
|
|
case 1: //TYPE_MESSAGE_CIPHERTEXT
|
|
decryptWhisperMessage(proto.source, getString(proto.message)).then(function(result) {
|
|
callback({message: result, pushMessage: proto});
|
|
});
|
|
break;
|
|
case 3: //TYPE_MESSAGE_PREKEY_BUNDLE
|
|
if (proto.message.readUint8() != (2 << 4 | 2))
|
|
throw new Error("Bad version byte");
|
|
var preKeyProto = decodePreKeyWhisperMessageProtobuf(getString(proto.message));
|
|
initSessionFromPreKeyWhisperMessage(proto.source, preKeyProto).then(function() {
|
|
decryptWhisperMessage(proto.source, getString(preKeyProto.message)).then(function(result) {
|
|
callback({message: result, pushMessage: proto});
|
|
});
|
|
});
|
|
break;
|
|
}
|
|
}
|
|
|
|
// callback(encoded [PreKey]WhisperMessage)
|
|
crypto.encryptMessageFor = function(deviceObject, pushMessageContent, callback) {
|
|
var session = crypto_storage.getSession(deviceObject.encodedNumber);
|
|
|
|
var doEncryptPushMessageContent = function() {
|
|
var msg = new WhisperMessageProtobuf();
|
|
var plaintext = toArrayBuffer(pushMessageContent.encode());
|
|
|
|
msg.ephemeralKey = toArrayBuffer(session.currentRatchet.ephemeralKeyPair.pubKey);
|
|
var chain = session[getString(msg.ephemeralKey)];
|
|
|
|
return fillMessageKeys(chain, chain.chainKey.counter + 1).then(function() {
|
|
return HKDF(chain.messageKeys[chain.chainKey.counter], '', "WhisperMessageKeys").then(function(keys) {
|
|
delete chain.messageKeys[chain.chainKey.counter];
|
|
msg.counter = chain.chainKey.counter;
|
|
msg.previousCounter = session.currentRatchet.previousCounter;
|
|
|
|
var iv = intToArrayBuffer(chain.chainKey.counter);
|
|
return encryptAESCTR(plaintext, keys[0], iv).then(function(ciphertext) {
|
|
msg.ciphertext = ciphertext;
|
|
var encodedMsg = getString(msg.encode());
|
|
|
|
return calculateMACWithVersionByte(encodedMsg, keys[1], (2 << 4) | 2).then(function(mac) {
|
|
var result = String.fromCharCode((2 << 4) | 2) + encodedMsg + getString(mac).substring(0, 8);
|
|
crypto_storage.saveSession(deviceObject.encodedNumber, session);
|
|
return result;
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
var preKeyMsg = new PreKeyWhisperMessageProtobuf();
|
|
preKeyMsg.identityKey = toArrayBuffer(crypto_storage.getStoredPubKey("identityKey"));
|
|
preKeyMsg.preKeyId = deviceObject.preKeyId;
|
|
preKeyMsg.registrationId = deviceObject.registrationId;
|
|
|
|
if (session === undefined) {
|
|
createNewKeyPair(false).then(function(baseKey) {
|
|
preKeyMsg.baseKey = toArrayBuffer(baseKey.pubKey);
|
|
initSession(true, baseKey, deviceObject.encodedNumber, deviceObject.identityKey, deviceObject.publicKey).then(function() {
|
|
//TODO: Delete preKey info on first message received back
|
|
session = crypto_storage.getSession(deviceObject.encodedNumber);
|
|
session.pendingPreKey = baseKey.pubKey;
|
|
doEncryptPushMessageContent().then(function(message) {
|
|
preKeyMsg.message = toArrayBuffer(message);
|
|
var result = String.fromCharCode((2 << 4) | 2) + getString(preKeyMsg.encode());
|
|
callback({type: 3, body: result});
|
|
});
|
|
});
|
|
});
|
|
} else
|
|
doEncryptPushMessageContent().then(function(message) {
|
|
if (session.pendingPreKey !== undefined) {
|
|
preKeyMsg.baseKey = toArrayBuffer(session.pendingPreKey);
|
|
preKeyMsg.message = toArrayBuffer(message);
|
|
var result = String.fromCharCode((2 << 4) | 2) + getString(preKeyMsg.encode());
|
|
callback({type: 3, body: result});
|
|
} else
|
|
callback({type: 1, body: getString(message)});
|
|
});
|
|
}
|
|
|
|
var GENERATE_KEYS_KEYS_GENERATED = 100;
|
|
crypto.generateKeys = function(callback) {
|
|
var identityKey = crypto_storage.getStoredPubKey("identityKey");
|
|
var identityKeyCalculated = function(pubKey) {
|
|
identityKey = pubKey;
|
|
|
|
var firstKeyId = storage.getEncrypted("maxPreKeyId", -1) + 1;
|
|
storage.putEncrypted("maxPreKeyId", firstKeyId + GENERATE_KEYS_KEYS_GENERATED);
|
|
|
|
if (firstKeyId > 16777000)
|
|
throw new Error("You crazy motherfucker");
|
|
|
|
var keys = {};
|
|
keys.keys = [];
|
|
var keysLeft = GENERATE_KEYS_KEYS_GENERATED;
|
|
for (var i = firstKeyId; i < firstKeyId + GENERATE_KEYS_KEYS_GENERATED; i++) {
|
|
crypto_storage.getNewPubKeySTORINGPrivKey("preKey" + i, false, function(pubKey) {
|
|
keys.keys[i] = {keyId: i, publicKey: pubKey, identityKey: identityKey};
|
|
keysLeft--;
|
|
if (keysLeft == 0) {
|
|
// 0xFFFFFF == 16777215
|
|
keys.lastResortKey = {keyId: 16777215, publicKey: crypto_storage.getStoredPubKey("preKey16777215"), identityKey: identityKey};//TODO: Rotate lastResortKey
|
|
if (keys.lastResortKey.publicKey === undefined) {
|
|
crypto_storage.getNewPubKeySTORINGPrivKey("preKey16777215", false, function(pubKey) {
|
|
keys.lastResortKey.publicKey = pubKey;
|
|
callback(keys);
|
|
});
|
|
} else
|
|
callback(keys);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
if (identityKey === undefined)
|
|
crypto_storage.getNewPubKeySTORINGPrivKey("identityKey", true, function(pubKey) { identityKeyCalculated(pubKey); });
|
|
else
|
|
identityKeyCalculated(identityKey);
|
|
}
|
|
|
|
}( window.crypto = window.crypto || {}, jQuery ));
|
|
|
|
|
|
// message_callback(decoded_protobuf) (use decodeMessage(proto))
|
|
var subscribeToPushMessageSemaphore = 0;
|
|
function subscribeToPush(message_callback) {
|
|
subscribeToPushMessageSemaphore++;
|
|
if (subscribeToPushMessageSemaphore <= 0)
|
|
return;
|
|
|
|
var user = storage.getUnencrypted("number_id");
|
|
var password = storage.getEncrypted("password");
|
|
var URL = URL_BASE.replace(/^http:/g, "ws:").replace(/^https:/g, "wss:") + URL_CALLS['push'] + "/?user=%2B" + getString(user).substring(1) + "&password=" + getString(password);
|
|
var socket = new WebSocket(URL);
|
|
|
|
var pingInterval;
|
|
|
|
//TODO: GUI
|
|
socket.onerror = function(socketEvent) {
|
|
console.log('Server is down :(');
|
|
clearInterval(pingInterval);
|
|
subscribeToPushMessageSemaphore--;
|
|
setTimeout(function() { subscribeToPush(message_callback); }, 60000);
|
|
};
|
|
socket.onclose = function(socketEvent) {
|
|
console.log('Server closed :(');
|
|
clearInterval(pingInterval);
|
|
subscribeToPushMessageSemaphore--;
|
|
setTimeout(function() { subscribeToPush(message_callback); }, 60000);
|
|
};
|
|
socket.onopen = function(socketEvent) {
|
|
console.log('Connected to server!');
|
|
pingInterval = setInterval(function() { console.log("Sending server ping message."); socket.send(JSON.stringify({type: 2})); }, 30000);
|
|
};
|
|
|
|
socket.onmessage = function(response) {
|
|
try {
|
|
var message = JSON.parse(response.data);
|
|
} catch (e) {
|
|
console.log('Error parsing server JSON message: ' + response.responseBody.split("|")[1]);
|
|
return;
|
|
}
|
|
|
|
if (message.type == 3) {
|
|
console.log("Got pong message");
|
|
} else if (message.type === undefined && message.id !== undefined) {
|
|
crypto.decryptWebsocketMessage(message.message).then(function(plaintext) {
|
|
var proto = decodeIncomingPushMessageProtobuf(plaintext);
|
|
// After this point, a) decoding errors are not the server's fault, and
|
|
// b) we should handle them gracefully and tell the user they received an invalid message
|
|
console.log("Successfully decoded message with id: " + message.id);
|
|
socket.send(JSON.stringify({type: 1, id: message.id}));
|
|
crypto.handleIncomingPushMessageProto(proto, function(decrypted) {
|
|
storeMessage(decrypted);
|
|
message_callback(decrypted);
|
|
}); // Decrypts/decodes/fills in fields/etc
|
|
}).catch(function(e) {
|
|
console.log("Error decoding message: " + e);
|
|
});
|
|
}
|
|
};
|
|
}
|
|
|
|
// success_callback(identity_key), error_callback(error_msg)
|
|
function getKeysForNumber(number, success_callback, error_callback) {
|
|
API.getKeysForNumber(number,
|
|
function(response) {
|
|
for (var i = 0; i < response.length; i++) {
|
|
try {
|
|
saveDeviceObject({
|
|
encodedNumber: number + "." + response[i].deviceId,
|
|
identityKey: response[i].identityKey,
|
|
publicKey: response[i].publicKey,
|
|
preKeyId: response[i].keyId,
|
|
registrationId: response[i].registrationId
|
|
});
|
|
} catch (e) {
|
|
error_callback(e);
|
|
return;
|
|
}
|
|
}
|
|
success_callback(response[0].identityKey);
|
|
}, function(code) {
|
|
error_callback("Error making HTTP request: " + code);
|
|
});
|
|
}
|
|
|
|
// success_callback(server success/failure map), error_callback(error_msg)
|
|
// message == PushMessageContentProto (NOT STRING)
|
|
function sendMessageToDevices(number, deviceObjectList, message, success_callback, error_callback) {
|
|
var jsonData = [];
|
|
var relay = undefined;
|
|
|
|
var doSend = function() {
|
|
API.sendMessages(number, jsonData,
|
|
function(result) {
|
|
success_callback(result);
|
|
}, function(code) {
|
|
error_callback(code);
|
|
}
|
|
);
|
|
}
|
|
|
|
var addEncryptionFor;
|
|
addEncryptionFor = function(i) {
|
|
crypto.encryptMessageFor(deviceObjectList[i], message, function(encryptedMsg) {
|
|
jsonData[i] = {
|
|
type: encryptedMsg.type,
|
|
destination: deviceObjectList[i].encodedNumber,
|
|
destinationRegistrationId: deviceObjectList[i].registrationId,
|
|
body: encryptedMsg.body,
|
|
timestamp: new Date().getTime()
|
|
};
|
|
|
|
if (deviceObjectList[i].relay !== undefined) {
|
|
jsonData[i].relay = deviceObjectList[i].relay;
|
|
if (relay === undefined)
|
|
relay = jsonData[i].relay;
|
|
else if (relay != jsonData[i].relay) {
|
|
error_callback("Mismatched relays for number " + number);
|
|
return;
|
|
}
|
|
} else {
|
|
if (relay === undefined)
|
|
relay = "";
|
|
else if (relay != "") {
|
|
error_callback("Mismatched relays for number " + number);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (i+1 < deviceObjectList.length)
|
|
addEncryptionFor(i+1);
|
|
else
|
|
doSend();
|
|
});
|
|
//TODO: need to encrypt with session key?
|
|
}
|
|
addEncryptionFor(0);
|
|
}
|
|
|
|
// callback(success/failure map, see code)
|
|
// message == PushMessageContentProto (NOT STRING)
|
|
function sendMessageToNumbers(numbers, message, callback) {
|
|
var numbersCompleted = 0;
|
|
var errors = [];
|
|
var successfulNumbers = [];
|
|
|
|
var numberCompleted = function() {
|
|
numbersCompleted++;
|
|
if (numbersCompleted >= numbers.length)
|
|
callback({success: successfulNumbers, failure: errors});
|
|
}
|
|
|
|
var registerError = function(number, message) {
|
|
errors[errors.length] = { number: number, reason: message };
|
|
numberCompleted();
|
|
}
|
|
|
|
var doSendMessage = function(number, devicesForNumber, message) {
|
|
sendMessageToDevices(number, devicesForNumber, message, function(result) {
|
|
successfulNumbers[successfulNumbers.length] = number;
|
|
numberCompleted();
|
|
}, function(error_code) {
|
|
//TODO: Re-request keys for number here
|
|
if (error_code == 410 || error_code == 409) {}
|
|
registerError(number, message);
|
|
});
|
|
}
|
|
|
|
for (var i = 0; i < numbers.length; i++) {
|
|
var number = numbers[i];
|
|
var devicesForNumber = getDeviceObjectListFromNumber(number);
|
|
|
|
if (devicesForNumber.length == 0) {
|
|
getKeysForNumber(number, function(identity_key) {
|
|
devicesForNumber = getDeviceObjectListFromNumber(number);
|
|
if (devicesForNumber.length == 0)
|
|
registerError(number, "Failed to retreive new device keys for number " + number);
|
|
else
|
|
doSendMessage(number, devicesForNumber, message);
|
|
}, function(error_msg) {
|
|
registerError(number, "Failed to retreive new device keys for number " + number);
|
|
});
|
|
} else
|
|
doSendMessage(number, devicesForNumber, message);
|
|
}
|
|
}
|
|
|
|
function requestIdentityPrivKeyFromMasterDevice(number, identityKey) {
|
|
sendMessageToDevices([getDeviceObject(getNumberFromString(number)) + ".1"],
|
|
{message: "Identity Key request"}, function() {}, function() {});//TODO
|
|
}
|
|
|