node/test/pummel/test-crypto-dh.js

// Copyright Joyent, Inc. and other Node contributors.
//
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//
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var common = require('../common');
var assert = require('assert');

try {
  var crypto = require('crypto');
} catch (e) {
  console.log('Not compiled with OPENSSL support.');
  process.exit();
}

assert.throws(function() {
  crypto.getDiffieHellman('unknown-group');
});
assert.throws(function() {
  crypto.getDiffieHellman('modp1').setPrivateKey('');
});
assert.throws(function() {
  crypto.getDiffieHellman('modp1').setPublicKey('');
});

var hashes = {
  modp1 : "b4b330a6ffeacfbd861e7fe2135b4431",
  modp2 : "7c3c5cad8b9f378d88f1dd64a4b6413a",
  modp5 : "b1d2acc22c542e08669a5c5ae812694d",
  modp14 : "8d041538cecc1a7d915ba4b718f8ad20",
  modp15 : "dc3b93def24e078c4fbf92d5e14ba69b",
  modp16 : "a273487f46f699461f613b3878d9dfd9",
  modp17 : "dc76e09935310348c492de9bd82014d0",
  modp18 : "db08973bfd2371758a69db180871c993"
}

for (var name in hashes) {
  var group = crypto.getDiffieHellman(name);
  var private_key = group.getPrime('hex');
  var hash1 = hashes[name];
  var hash2 = crypto.createHash('md5').update(private_key.toUpperCase()).digest('hex');
  assert.equal(hash1, hash2);
  assert.equal(group.getGenerator('hex'), '02');
}

for (var name in hashes) {
  var group1 = crypto.getDiffieHellman(name);
  var group2 = crypto.getDiffieHellman(name);
  group1.generateKeys();
  group2.generateKeys();
  var key1 = group1.computeSecret(group2.getPublicKey());
  var key2 = group2.computeSecret(group1.getPublicKey());
  assert.deepEqual(key1, key2);
}