bsrp
Version:
Secure Remote Password Protocol (SRP-6a) Implementation
131 lines (130 loc) • 6.72 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
exports.__esModule = true;
exports.verifySession = exports.processChallenge = exports.generateAPair = exports.utils = exports.toBigInteger = exports.constants = void 0;
var jsbn_1 = require("jsbn");
var utils = __importStar(require("./utils"));
exports.utils = utils;
var constants = __importStar(require("./constants"));
exports.constants = constants;
var generateRandomBytes = utils.generateRandomBytes, hash = utils.hash, toBigInteger = utils.toBigInteger, pad = utils.pad, calculateM = utils.calculateM, calculateX = utils.calculateX;
exports.toBigInteger = toBigInteger;
var generator = constants.generator, prime = constants.prime;
exports.generateAPair = function () {
var ephemeralA = toBigInteger(generateRandomBytes(32));
var publicA = generator.modPow(ephemeralA, prime);
return {
ephemeralA: ephemeralA,
publicA: publicA
};
};
exports.processChallenge = function (identity, password, salt, ephemeralA, publicA, publicB) { return __awaiter(void 0, void 0, void 0, function () {
var width, paddedGenerator, paddedPublicA, paddedPublicB, scrambler, _a, x, multiplier, _b, t1, t2, S, sessionKey, message;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
width = Math.floor((prime.bitLength() + 7) / 8);
paddedGenerator = pad(generator, width);
paddedPublicA = pad(publicA, width);
paddedPublicB = pad(publicB, width);
_a = toBigInteger;
return [4, hash(paddedPublicA, paddedPublicB)];
case 1:
scrambler = _a.apply(void 0, [_c.sent()]);
return [4, calculateX(salt, identity, password)];
case 2:
x = _c.sent();
_b = toBigInteger;
return [4, hash(prime, paddedGenerator)];
case 3:
multiplier = _b.apply(void 0, [_c.sent()]);
if (publicB.mod(prime).equals(jsbn_1.BigInteger.ZERO)) {
return [2, null];
}
if (scrambler.equals(jsbn_1.BigInteger.ZERO)) {
return [2, null];
}
t1 = publicB.subtract(multiplier.multiply(generator.modPow(x, prime)));
t2 = ephemeralA.add(scrambler.multiply(x));
S = t1.modPow(t2, prime);
return [4, hash(S)];
case 4:
sessionKey = _c.sent();
return [4, calculateM(generator, prime, identity, salt, publicA, publicB, sessionKey)];
case 5:
message = _c.sent();
return [2, {
message: toBigInteger(message),
sessionKey: toBigInteger(sessionKey)
}];
}
});
}); };
exports.verifySession = function (publicA, message, sessionKey, serverHAMK) { return __awaiter(void 0, void 0, void 0, function () {
var clientHAMK;
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4, hash(publicA, message, sessionKey)];
case 1:
clientHAMK = _a.sent();
if (!toBigInteger(clientHAMK).equals(serverHAMK)) {
return [2, null];
}
return [2, toBigInteger(clientHAMK)];
}
});
}); };