drbg-test.js
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'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'));
});
});
});