| 'use strict'; |
| |
| const assert = require('assert'); |
| const HmacDRBG = require('../'); |
| const hash = require('hash.js'); |
| |
| describe('Hmac_DRBG', () => { |
| it('should support hmac-drbg-sha256', () => { |
| function doDrbg(opt) { |
| const drbg = HmacDRBG({ |
| hash: hash.sha256, |
| entropy: opt.entropy, |
| entropyEnc: 'utf8', |
| nonce: opt.nonce, |
| nonceEnc: 'utf8', |
| pers: opt.pers, |
| persEnc: 'utf8' |
| }); |
| return drbg.generate(opt.size, 'hex'); |
| } |
| |
| const test = [ |
| { |
| entropy: 'totally random0123456789', |
| nonce: 'secret nonce', |
| pers: 'my drbg', |
| size: 32, |
| res: '018ec5f8e08c41e5ac974eb129ac297c5388ee1864324fa13d9b15cf98d9a157' |
| }, |
| { |
| entropy: 'totally random0123456789', |
| nonce: 'secret nonce', |
| pers: null, |
| size: 32, |
| res: 'ed5d61ecf0ef38258e62f03bbb49f19f2cd07ba5145a840d83b134d5963b3633' |
| } |
| ]; |
| for (let i = 0; i < test.length; i++) |
| assert.equal(doDrbg(test[i]), test[i].res); |
| }); |
| |
| describe('NIST vector', function() { |
| require('./fixtures/hmac-drbg-nist.json').forEach(function (opt) { |
| it('should not fail at ' + opt.name, function() { |
| const drbg = HmacDRBG({ |
| hash: hash.sha256, |
| entropy: opt.entropy, |
| nonce: opt.nonce, |
| pers: opt.pers |
| }); |
| |
| let last; |
| for (let i = 0; i < opt.add.length; i++) { |
| let add = opt.add[i]; |
| last = drbg.generate(opt.expected.length / 2, 'hex', add); |
| } |
| assert.equal(last, opt.expected); |
| }); |
| }); |
| }); |
| |
| describe('reseeding', function() { |
| it('should reseed', function() { |
| const entropy = 'totally random string with many chars that I typed ' + |
| 'in agony'; |
| const nonce = 'nonce'; |
| const pers = 'pers'; |
| |
| const original = HmacDRBG({ |
| hash: hash.sha256, |
| entropy, |
| nonce, |
| pers |
| }); |
| const reseeded = HmacDRBG({ |
| hash: hash.sha256, |
| entropy, |
| nonce, |
| pers |
| }); |
| |
| assert.strictEqual(original.generate(32, 'hex'), |
| reseeded.generate(32, 'hex')); |
| |
| reseeded.reseed('another absolutely random string'); |
| |
| assert.notEqual(original.generate(32, 'hex'), |
| reseeded.generate(32, 'hex')); |
| }); |
| }); |
| }); |