<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Crypt
 * @subpackage UnitTests
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: DiffieHellmanTest.php 23514 2010-12-15 19:29:04Z mjh_ca $
 */

require_once 'Zend/Crypt/DiffieHellman.php';
require_once 'Zend/Crypt/Math/BigInteger.php';

/**
 * @category   Zend
 * @package    Zend_Crypt
 * @subpackage UnitTests
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @group      Zend_Crypt
 */
class Zend_Crypt_DiffieHellmanTest extends PHPUnit_Framework_TestCase
{
    public function setUp()
    {
        try {
            $math = new Zend_Crypt_Math_BigInteger();
        } catch (Zend_Crypt_Math_BigInteger_Exception $e) {
            if (strpos($e->getMessage(), 'big integer precision math support not detected') !== false) {
                $this->markTestSkipped($e->getMessage());
            } else {
                throw $e;
            }
        }
    }

    public function testDiffieWithSpec()
    {
        $aliceOptions = array(
            'prime'=>'563',
            'generator'=>'5',
            'private'=>'9'
        );
        $bobOptions = array(
            'prime'=>'563',
            'generator'=>'5',
            'private'=>'14'
        );

        Zend_Crypt_DiffieHellman::$useOpenssl = false;
        $alice = new Zend_Crypt_DiffieHellman($aliceOptions['prime'], $aliceOptions['generator'], $aliceOptions['private']);
        $bob = new Zend_Crypt_DiffieHellman($bobOptions['prime'], $bobOptions['generator'], $bobOptions['private']);
        $alice->generateKeys();
        $bob->generateKeys();

        $this->assertEquals('78', $alice->getPublicKey());
        $this->assertEquals('534', $bob->getPublicKey());

        $aliceSecretKey = $alice->computeSecretKey($bob->getPublicKey());
        $bobSecretKey = $bob->computeSecretKey($alice->getPublicKey());

        // both Alice and Bob should now have the same secret key
        $this->assertEquals('117', $aliceSecretKey);
        $this->assertEquals('117', $bobSecretKey);
    }

    public function testDiffieWithBinaryFormsAndLargeIntegers()
    {
        $aliceOptions = array(
            'prime' => '155172898181473697471232257763715539915724801966915404479707795314057629378541917580651227423698188993727816152646631438561595825688188889951272158842675419950341258706556549803580104870537681476726513255747040765857479291291572334510643245094715007229621094194349783925984760375594985848253359305585439638443',
            'generator'=>'2',
            'private' => '99209314066572595236408569591967988557141249561494267486251808035535396332278620143536317681312712891672623072630995180324388841681491857745515696789091127409515009250358965816666146342049838178521379132153348139908016819196219448310107072632515749339055798122538615135104828702523796951800575031871051678091'
        );
        $bobOptions = array(
            'prime' => '155172898181473697471232257763715539915724801966915404479707795314057629378541917580651227423698188993727816152646631438561595825688188889951272158842675419950341258706556549803580104870537681476726513255747040765857479291291572334510643245094715007229621094194349783925984760375594985848253359305585439638443',
            'generator'=>'2',
            'private' => '33411735792639558625733635717892563612548180650402161151077478314841463707948899786103588912325634730410551946772752880177868972816963551821740386700076034213408153924692562543117963464733156600545484510833072427003474207064650714831083304497737160382097083356876078146231616972608703322302585471319261275664'
        );

        Zend_Crypt_DiffieHellman::$useOpenssl = false;
        $alice = new Zend_Crypt_DiffieHellman($aliceOptions['prime'], $aliceOptions['generator'], $aliceOptions['private']);
        $bob = new Zend_Crypt_DiffieHellman($bobOptions['prime'], $bobOptions['generator'], $bobOptions['private']);
        $alice->generateKeys();
        $bob->generateKeys();

        //0DmJUe9dr02pAtVoGyLHdC+rfBU3mDCelKGPXRDFHofx6mFfN2gcZCmp/ab4ezDXfpIBOatpVdbn2fTNUGo64DtKE2WGTsZCl90RgrGUv8XW/4WDPXeE7g5u7KWHBG/LCE5+XsilE5P5/GIyqr9gsiudTmk+H/hiYZl9Smar9k0=
        $this->assertEquals('ANA5iVHvXa9NqQLVaBsix3Qvq3wVN5gwnpShj10QxR6H8ephXzdoHGQpqf2m+Hsw136SATmraVXW59n0zVBqOuA7ShNlhk7GQpfdEYKxlL/F1v+Fgz13hO4ObuylhwRvywhOfl7IpROT+fxiMqq/YLIrnU5pPh/4YmGZfUpmq/ZN', base64_encode($alice->getPublicKey(Zend_Crypt_DiffieHellman::BINARY)));

        //v8puCBaHdch0stxmkyS/sZvZHyB5f0AVkopAQ5wKSZIyEHHcGn7DXXH2u4WdCL+kMr8BcRpxRBJ0TDwfZPpu53nFNEjUd81WlfaKk95e4a/DC4dhlfBkQMebleobhedQPFAo7F9SkHN7uTLa/glxG+3T9DTb+ikcOVPoH3A1G6g=
        $this->assertEquals('AL/KbggWh3XIdLLcZpMkv7Gb2R8geX9AFZKKQEOcCkmSMhBx3Bp+w11x9ruFnQi/pDK/AXEacUQSdEw8H2T6bud5xTRI1HfNVpX2ipPeXuGvwwuHYZXwZEDHm5XqG4XnUDxQKOxfUpBze7ky2v4JcRvt0/Q02/opHDlT6B9wNRuo', base64_encode($bob->getPublicKey(Zend_Crypt_DiffieHellman::BINARY)));

        $aliceSecretKey = $alice->computeSecretKey($bob->getPublicKey(Zend_Crypt_DiffieHellman::BINARY), Zend_Crypt_DiffieHellman::BINARY, Zend_Crypt_DiffieHellman::BINARY);
        $bobSecretKey = $bob->computeSecretKey($alice->getPublicKey(Zend_Crypt_DiffieHellman::BINARY), Zend_Crypt_DiffieHellman::BINARY, Zend_Crypt_DiffieHellman::BINARY);

        // both Alice and Bob should now have the same secret key
        $expectedSharedSecret = base64_decode('FAAkw7NN1+raX9K1+dR3nqX2LZcDYYuZH13lpasaDIM4/ZXqbzdgiHZ86SILN27BjmJObtNQG/SNHfhxMalLMtLv+v0JFte/6+pIvMG9tAoPFsVh2BAvBuNpLY5W5gusgQ2p4pvJK0wz9YJ8iFdOHEOnhzYuN7LS/YXx2rBOz0Q=');
        $this->assertEquals($expectedSharedSecret, $aliceSecretKey);
        $this->assertEquals($expectedSharedSecret, $bobSecretKey);
    }

    public function testDiffieWithBinaryFormsAndLargeIntegers_OpensslTest()
    {
        // skip this test if openssl DH support is not available
        if (!function_exists('openssl_dh_compute_key')) {
            $this->markTestSkipped(
              'An openssl extension with Diffie-Hellman support is not available.'
            );
        }

        $aliceOptions = array(
            'prime' => '155172898181473697471232257763715539915724801966915404479707795314057629378541917580651227423698188993727816152646631438561595825688188889951272158842675419950341258706556549803580104870537681476726513255747040765857479291291572334510643245094715007229621094194349783925984760375594985848253359305585439638443',
            'generator'=>'2',
            'private' => '99209314066572595236408569591967988557141249561494267486251808035535396332278620143536317681312712891672623072630995180324388841681491857745515696789091127409515009250358965816666146342049838178521379132153348139908016819196219448310107072632515749339055798122538615135104828702523796951800575031871051678091'
        );
        $bobOptions = array(
            'prime' => '155172898181473697471232257763715539915724801966915404479707795314057629378541917580651227423698188993727816152646631438561595825688188889951272158842675419950341258706556549803580104870537681476726513255747040765857479291291572334510643245094715007229621094194349783925984760375594985848253359305585439638443',
            'generator'=>'2',
            'private' => '33411735792639558625733635717892563612548180650402161151077478314841463707948899786103588912325634730410551946772752880177868972816963551821740386700076034213408153924692562543117963464733156600545484510833072427003474207064650714831083304497737160382097083356876078146231616972608703322302585471319261275664'
        );

        $alice = new Zend_Crypt_DiffieHellman($aliceOptions['prime'], $aliceOptions['generator'], $aliceOptions['private']);
        $bob = new Zend_Crypt_DiffieHellman($bobOptions['prime'], $bobOptions['generator'], $bobOptions['private']);
        $alice->generateKeys();
        $bob->generateKeys();
        $this->assertEquals('ANA5iVHvXa9NqQLVaBsix3Qvq3wVN5gwnpShj10QxR6H8ephXzdoHGQpqf2m+Hsw136SATmraVXW59n0zVBqOuA7ShNlhk7GQpfdEYKxlL/F1v+Fgz13hO4ObuylhwRvywhOfl7IpROT+fxiMqq/YLIrnU5pPh/4YmGZfUpmq/ZN', base64_encode($alice->getPublicKey(Zend_Crypt_DiffieHellman::BINARY)));
        $this->assertEquals('AL/KbggWh3XIdLLcZpMkv7Gb2R8geX9AFZKKQEOcCkmSMhBx3Bp+w11x9ruFnQi/pDK/AXEacUQSdEw8H2T6bud5xTRI1HfNVpX2ipPeXuGvwwuHYZXwZEDHm5XqG4XnUDxQKOxfUpBze7ky2v4JcRvt0/Q02/opHDlT6B9wNRuo', base64_encode($bob->getPublicKey(Zend_Crypt_DiffieHellman::BINARY)));

        $aliceSecretKey = $alice->computeSecretKey($bob->getPublicKey(Zend_Crypt_DiffieHellman::BINARY), Zend_Crypt_DiffieHellman::BINARY, Zend_Crypt_DiffieHellman::BINARY);
        $bobSecretKey = $bob->computeSecretKey($alice->getPublicKey(Zend_Crypt_DiffieHellman::BINARY), Zend_Crypt_DiffieHellman::BINARY, Zend_Crypt_DiffieHellman::BINARY);

        // both Alice and Bob should now have the same secret key
        $expectedSharedSecret = base64_decode('FAAkw7NN1+raX9K1+dR3nqX2LZcDYYuZH13lpasaDIM4/ZXqbzdgiHZ86SILN27BjmJObtNQG/SNHfhxMalLMtLv+v0JFte/6+pIvMG9tAoPFsVh2BAvBuNpLY5W5gusgQ2p4pvJK0wz9YJ8iFdOHEOnhzYuN7LS/YXx2rBOz0Q=');
        $this->assertEquals($expectedSharedSecret, $aliceSecretKey);
        $this->assertEquals($expectedSharedSecret, $bobSecretKey);
    }

    public function testGenerateKeysWithUnsetPrivateKey()
    {
        $dh = new Zend_Crypt_DiffieHellman(563, 5);
        $dh->generateKeys();
        $privateKey = $dh->getPrivateKey();
        $this->assertNotNull($privateKey);
    }
}
