dh.js

var test = require('tape');
var crypto = require('diffie-hellman/browser');
test('diffie-hellman mod groups', function (t) {
  [
     'modp1', 'modp2', 'modp5', 'modp14', 'modp15', 'modp16'
  ].forEach(function (mod) {
    t.test(mod, function (t){
      t.plan(3);
      var dh1 = crypto.getDiffieHellman(mod);
      var p1 = dh1.getPrime().toString('hex');
      dh1.generateKeys();
      var dh2 = crypto.getDiffieHellman(mod);
      var p2 = dh2.getPrime().toString('hex');
      dh2.generateKeys();
      t.equals(p1, p2, 'equal primes');
      var pubk1 = dh1.getPublicKey();
      var pubk2 = dh2.getPublicKey();
      t.notEquals(pubk1, pubk2, 'diff public keys');
      var pub1 = dh1.computeSecret(pubk2).toString('hex');
      var pub2 = dh2.computeSecret(dh1.getPublicKey()).toString('hex');
      t.equals(pub1, pub2, 'equal secrets');
    });
  });
});
test('diffie-hellman key lengths', function (t) {
  [
     64, 65, 192
  ].forEach(function (len) {
    t.test('' + len, function (t){
      t.plan(3);
      var dh2 = crypto.createDiffieHellman(len);
      var prime2 = dh2.getPrime();
      var p2 = prime2.toString('hex');
      var dh1 = crypto.createDiffieHellman(prime2);
      var p1 = dh1.getPrime().toString('hex');
      dh1.generateKeys();
      dh2.generateKeys();
      t.equals(p1, p2, 'equal primes');
      var pubk1 = dh1.getPublicKey();
      var pubk2 = dh2.getPublicKey();
      t.notEquals(pubk1, pubk2, 'diff public keys');
      var pub1 = dh1.computeSecret(pubk2).toString('hex');
      var pub2 = dh2.computeSecret(dh1.getPublicKey()).toString('hex');
      t.equals(pub1, pub2, 'equal secrets');
    });
  });
});