text: var test = require('tape')
  var cryptoB = require('../../src')
  var crypto = require('crypto')
  
  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 = cryptoB.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(pubk1).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 = cryptoB.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')
      })
    })
  })
  