@aws-amplify/auth
Version:
Auth category of aws-amplify
40 lines (37 loc) • 1.49 kB
JavaScript
import AuthenticationHelper from './AuthenticationHelper/AuthenticationHelper.mjs';
import BigInteger from './BigInteger/BigInteger.mjs';
import { calculateA } from './calculate/calculateA.mjs';
import { INIT_N } from './constants.mjs';
import '@aws-crypto/sha256-js';
import { getHexFromBytes } from './getHexFromBytes.mjs';
import { getRandomBytes } from './getRandomBytes.mjs';
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
/**
* Returns a new {@link AuthenticationHelper} instance with randomly generated BigInteger seed
*
* @param userPoolName Cognito user pool name.
* @returns An {@link AuthenticationHelper} instance.
*
* @internal
*/
const getAuthenticationHelper = async (userPoolName) => {
const N = new BigInteger(INIT_N, 16);
const g = new BigInteger('2', 16);
const a = generateRandomBigInteger();
const A = await calculateA({ a, g, N });
return new AuthenticationHelper({ userPoolName, a, g, A, N });
};
/**
* Generates a random BigInteger.
*
* @returns {BigInteger} a random value.
*/
const generateRandomBigInteger = () => {
// This will be interpreted as a postive 128-bit integer
const hexRandom = getHexFromBytes(getRandomBytes(128));
// There is no need to do randomBigInt.mod(this.N - 1) as N (3072-bit) is > 128 bytes (1024-bit)
return new BigInteger(hexRandom, 16);
};
export { getAuthenticationHelper };
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