node/test/parallel/test-dh-padding.js

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'use strict';
const common = require('../common');

if (!common.hasCrypto) {
  common.skip('node compiled without OpenSSL.');
  return;
}

const assert = require('assert');
const crypto = require('crypto');

/* This test verifies padding with leading zeroes for shared
 * secrets that are strictly smaller than the modulus (prime).
 * See:
 *  RFC 4346: https://www.ietf.org/rfc/rfc4346.txt
 *  https://github.com/nodejs/node-v0.x-archive/issues/7906
 *  https://github.com/nodejs/node-v0.x-archive/issues/5239
 *
 * In FIPS mode OPENSSL_DH_FIPS_MIN_MODULUS_BITS = 1024, meaning we need
 * a FIPS-friendly >= 1024 bit prime, we can use MODP 14 from RFC 3526:
 * https://www.ietf.org/rfc/rfc3526.txt
 *
 * We can generate appropriate values with this code:
 *
 * crypto = require('crypto');
 *
 * for (;;) {
 *   var a = crypto.getDiffieHellman('modp14'),
 *   var b = crypto.getDiffieHellman('modp14');
 *
 *   a.generateKeys();
 *   b.generateKeys();
 *
 *   var aSecret = a.computeSecret(b.getPublicKey()).toString('hex');
 *   console.log("A public: " + a.getPublicKey().toString('hex'));
 *   console.log("A private: " + a.getPrivateKey().toString('hex'));
 *   console.log("B public: " + b.getPublicKey().toString('hex'));
 *   console.log("B private: " + b.getPrivateKey().toString('hex'));
 *   console.log("A secret: " + aSecret);
 *   console.log('-------------------------------------------------');
 *   if(aSecret.substring(0,2) === "00") {
 *     console.log("found short key!");
 *     return;
 *   }
 * }
 */

const apub =
'5484455905d3eff34c70980e871f27f05448e66f5a6efbb97cbcba4e927196c2bd9ea272cded91\
10a4977afa8d9b16c9139a444ed2d954a794650e5d7cb525204f385e1af81530518563822ecd0f9\
524a958d02b3c269e79d6d69850f0968ad567a4404fbb0b19efc8bc73e267b6136b88cafb33299f\
f7c7cace3ffab1a88c2c9ee841f88b4c3679b4efc465f5c93cca11d487be57373e4c5926f634c4e\
efee6721d01db91cd66321615b2522f96368dbc818875d422140d0edf30bdb97d9721feddcb9ff6\
453741a4f687ee46fc54bf1198801f1210ac789879a5ee123f79e2d2ce1209df2445d32166bc9e4\
8f89e944ec9c3b2e16c8066cd8eebd4e33eb941';
const bpub =
'3fca64510e36bc7da8a3a901c7b74c2eabfa25deaf7cbe1d0c50235866136ad677317279e1fb0\
06e9c0a07f63e14a3363c8e016fbbde2b2c7e79fed1cc3e08e95f7459f547a8cd0523ee9dc744d\
e5a956d92b937db4448917e1f6829437f05e408ee7aea70c0362b37370c7c75d14449d8b2d2133\
04ac972302d349975e2265ca7103cfebd019d9e91234d638611abd049014f7abf706c1c5da6c88\
788a1fdc6cdf17f5fffaf024ce8711a2ebde0b52e9f1cb56224483826d6e5ac6ecfaae07b75d20\
6e8ac97f5be1a5b68f20382f2a7dac189cf169325c4cf845b26a0cd616c31fec905c5d9035e5f7\
8e9880c812374ac0f3ca3d365f06e4be526b5affd4b79';
const apriv =
'62411e34704637d99c6c958a7db32ac22fcafafbe1c33d2cfdb76e12ded41f38fc16b792b9041\
2e4c82755a3815ba52f780f0ee296ad46e348fc4d1dcd6b64f4eea1b231b2b7d95c5b1c2e26d34\
83520558b9860a6eb668f01422a54e6604aa7702b4e67511397ef3ecb912bff1a83899c5a5bfb2\
0ee29249a91b8a698e62486f7009a0e9eaebda69d77ecfa2ca6ba2db6c8aa81759c8c90c675979\
08c3b3e6fc60668f7be81cce6784482af228dd7f489005253a165e292802cfd0399924f6c56827\
7012f68255207722355634290acc7fddeefbba75650a85ece95b6a12de67eac016ba78960108dd\
5dbadfaa43cc9fed515a1f307b7d90ae0623bc7b8cefb';
const secret =
'00c37b1e06a436d6717816a40e6d72907a6f255638b93032267dcb9a5f0b4a9aa0236f3dce63b\
1c418c60978a00acd1617dfeecf1661d8a3fafb4d0d8824386750f4853313400e7e4afd22847e4\
fa56bc9713872021265111906673b38db83d10cbfa1dea3b6b4c97c8655f4ae82125281af7f234\
8916a15c6f95649367d169d587697480df4d10b381479e86d5518b520d9d8fb764084eab518224\
dc8fe984ddaf532fc1531ce43155fa0ab32532bf1ece5356b8a3447b5267798a904f16f3f4e635\
597adc0179d011132dcffc0bbcb0dd2c8700872f8663ec7ddd897c659cc2efebccc73f38f0ec96\
8612314311231f905f91c63a1aea52e0b60cead8b57df';

/* FIPS-friendly 2048 bit prime */
const p = crypto.createDiffieHellman(
  crypto.getDiffieHellman('modp14').getPrime());

p.setPublicKey(apub, 'hex');
p.setPrivateKey(apriv, 'hex');

assert.strictEqual(
  p.computeSecret(bpub, 'hex', 'hex').toString('hex'),
  secret
);