text: /*
  
  Copyright (c) 2007, Un Shyam
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  
      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in
        the documentation and/or other materials provided with the distribution.
      * Neither the name of the author nor the names of its
        contributors may be used to endorse or promote products derived
        from this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
  
  */
  
  #include <algorithm>
  #include <iostream>
  
  #include "libtorrent/hasher.hpp"
  #include "libtorrent/pe_crypto.hpp"
  #include "libtorrent/session.hpp"
  
  #include "setup_transfer.hpp"
  #include "test.hpp"
  
  #ifndef TORRENT_DISABLE_ENCRYPTION
  
  char const* pe_policy(boost::uint8_t policy)
  {
  	using namespace libtorrent;
  	
  	if (policy == pe_settings::disabled) return "disabled";
  	else if (policy == pe_settings::enabled) return "enabled";
  	else if (policy == pe_settings::forced) return "forced";
  	return "unknown";
  }
  
  void display_pe_settings(libtorrent::pe_settings s)
  {
  	using namespace libtorrent;
  	
  	fprintf(stderr, "out_enc_policy - %s\tin_enc_policy - %s\n"
  		, pe_policy(s.out_enc_policy), pe_policy(s.in_enc_policy));
  	
  	fprintf(stderr, "enc_level - %s\t\tprefer_rc4 - %s\n"
  		, s.allowed_enc_level == pe_settings::plaintext ? "plaintext"
  		: s.allowed_enc_level == pe_settings::rc4 ? "rc4"
  		: s.allowed_enc_level == pe_settings::both ? "both" : "unknown"
  		, s.prefer_rc4 ? "true": "false");
  }
  
  void test_transfer(libtorrent::pe_settings::enc_policy policy
  	, int timeout
  	, libtorrent::pe_settings::enc_level level = libtorrent::pe_settings::both
  	, bool pref_rc4 = false)
  {
  	using namespace libtorrent;
  
  	// these are declared before the session objects
  	// so that they are destructed last. This enables
  	// the sessions to destruct in parallel
  	session_proxy p1;
  	session_proxy p2;
  
  	session ses1(fingerprint("LT", 0, 1, 0, 0), std::make_pair(48800, 49000), "0.0.0.0", 0);
  	session ses2(fingerprint("LT", 0, 1, 0, 0), std::make_pair(49800, 50000), "0.0.0.0", 0);
  	pe_settings s;
  	
  	s.out_enc_policy = libtorrent::pe_settings::enabled;
  	s.in_enc_policy = libtorrent::pe_settings::enabled;
  	
  	s.allowed_enc_level = pe_settings::both;
  	ses2.set_pe_settings(s);
  
  	s.out_enc_policy = policy;
  	s.in_enc_policy = policy;
  	s.allowed_enc_level = level;
  	s.prefer_rc4 = pref_rc4;
  	ses1.set_pe_settings(s);
  
  	s = ses1.get_pe_settings();
  	fprintf(stderr, " Session1 \n");
  	display_pe_settings(s);
  	s = ses2.get_pe_settings();
  	fprintf(stderr, " Session2 \n");
  	display_pe_settings(s);
  
  	torrent_handle tor1;
  	torrent_handle tor2;
  
  	using boost::tuples::ignore;
  	boost::tie(tor1, tor2, ignore) = setup_transfer(&ses1, &ses2, 0, true, false, true
  		, "_pe", 16 * 1024, 0, false, 0, true);	
  
  	fprintf(stderr, "waiting for transfer to complete\n");
  
  	for (int i = 0; i < timeout * 10; ++i)
  	{
  		torrent_status s = tor2.status();
  		print_alerts(ses1, "ses1");
  		print_alerts(ses2, "ses2");
  
  		if (s.is_seeding) break;
  		test_sleep(100);
  	}
  
  	TEST_CHECK(tor2.status().is_seeding);
   	if (tor2.status().is_seeding) fprintf(stderr, "done\n");
  	ses1.remove_torrent(tor1);
  	ses2.remove_torrent(tor2);
  
  	// this allows shutting down the sessions in parallel
  	p1 = ses1.abort();
  	p2 = ses2.abort();
  
  	error_code ec;
  	remove_all("tmp1_pe", ec);
  	remove_all("tmp2_pe", ec);
  	remove_all("tmp3_pe", ec);
  }
  
  void test_enc_handler(libtorrent::encryption_handler* a, libtorrent::encryption_handler* b)
  {
  #ifdef TORRENT_USE_VALGRIND
  	const int repcount = 10;
  #else
  	const int repcount = 128;
  #endif
  	for (int rep = 0; rep < repcount; ++rep)
  	{
  		std::size_t buf_len = rand() % (512 * 1024);
  		char* buf = new char[buf_len];
  		char* cmp_buf = new char[buf_len];
  		
  		std::generate(buf, buf + buf_len, &std::rand);
  		std::memcpy(cmp_buf, buf, buf_len);
  		
  		a->encrypt(buf, buf_len);
  		TEST_CHECK(!std::equal(buf, buf + buf_len, cmp_buf));
  		b->decrypt(buf, buf_len);
  		TEST_CHECK(std::equal(buf, buf + buf_len, cmp_buf));
  		
  		b->encrypt(buf, buf_len);
  		TEST_CHECK(!std::equal(buf, buf + buf_len, cmp_buf));
  		a->decrypt(buf, buf_len);
  		TEST_CHECK(std::equal(buf, buf + buf_len, cmp_buf));
  		
  		delete[] buf;
  		delete[] cmp_buf;
  	}
  }
  
  #endif
  
  int test_main()
  {
  	using namespace libtorrent;
  
  #ifndef TORRENT_DISABLE_ENCRYPTION
  
  #ifdef TORRENT_USE_VALGRIND
  	const int repcount = 10;
  #else
  	const int repcount = 128;
  #endif
  
  	for (int rep = 0; rep < repcount; ++rep)
  	{
  		dh_key_exchange DH1, DH2;
  		
  		DH1.compute_secret(DH2.get_local_key());
  		DH2.compute_secret(DH1.get_local_key());
  		
  		TEST_CHECK(std::equal(DH1.get_secret(), DH1.get_secret() + 96, DH2.get_secret()));
  	}
  
  	dh_key_exchange DH1, DH2;
  	DH1.compute_secret(DH2.get_local_key());
  	DH2.compute_secret(DH1.get_local_key());
  
  	TEST_CHECK(std::equal(DH1.get_secret(), DH1.get_secret() + 96, DH2.get_secret()));
  
  	sha1_hash test1_key = hasher("test1_key",8).final();
  	sha1_hash test2_key = hasher("test2_key",8).final();
  
  	fprintf(stderr, "testing RC4 handler\n");
  	rc4_handler rc41;
  	rc41.set_incoming_key(&test2_key[0], 20);
  	rc41.set_outgoing_key(&test1_key[0], 20);
  	rc4_handler rc42;
  	rc42.set_incoming_key(&test1_key[0], 20);
  	rc42.set_outgoing_key(&test2_key[0], 20);
  	test_enc_handler(&rc41, &rc42);
  	
  #ifdef TORRENT_USE_VALGRIND
  	const int timeout = 10;
  #else
  	const int timeout = 5;
  #endif
  
  	test_transfer(pe_settings::disabled, timeout);
  
  	test_transfer(pe_settings::forced, timeout, pe_settings::plaintext);
  	test_transfer(pe_settings::forced, timeout, pe_settings::rc4);
  	test_transfer(pe_settings::forced, timeout, pe_settings::both, false);
  	test_transfer(pe_settings::forced, timeout, pe_settings::both, true);
  
  	test_transfer(pe_settings::enabled, timeout, pe_settings::plaintext);
  	test_transfer(pe_settings::enabled, timeout, pe_settings::rc4);
  	test_transfer(pe_settings::enabled, timeout, pe_settings::both, false);
  	test_transfer(pe_settings::enabled, timeout, pe_settings::both, true);
  #else
  	fprintf(stderr, "PE test not run because it's disabled\n");
  #endif
  
  	return 0;
  }
  
  