Replace boost by the standalone asio library

14 files changed, 1776 insertions, 0 deletions

diff --git a/lib/asio/ssl/detail/buffered_handshake_op.hpp b/lib/asio/ssl/detail/buffered_handshake_op.hpp
new file mode 100644
index 0000000..38a03fc
--- /dev/null
+++ b/lib/asio/ssl/detail/buffered_handshake_op.hpp
@@ -0,0 +1,114 @@
+//
+// ssl/detail/buffered_handshake_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_BUFFERED_HANDSHAKE_OP_HPP
+#define ASIO_SSL_DETAIL_BUFFERED_HANDSHAKE_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/ssl/detail/engine.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+template <typename ConstBufferSequence>
+class buffered_handshake_op
+{
+public:
+  buffered_handshake_op(stream_base::handshake_type type,
+      const ConstBufferSequence& buffers)
+    : type_(type),
+      buffers_(buffers),
+      total_buffer_size_(asio::buffer_size(buffers_))
+  {
+  }
+
+  engine::want operator()(engine& eng,
+      asio::error_code& ec,
+      std::size_t& bytes_transferred) const
+  {
+    return this->process(eng, ec, bytes_transferred,
+        asio::buffer_sequence_begin(buffers_),
+        asio::buffer_sequence_end(buffers_));
+  }
+
+  template <typename Handler>
+  void call_handler(Handler& handler,
+      const asio::error_code& ec,
+      const std::size_t& bytes_transferred) const
+  {
+    handler(ec, bytes_transferred);
+  }
+
+private:
+  template <typename Iterator>
+  engine::want process(engine& eng,
+      asio::error_code& ec,
+      std::size_t& bytes_transferred,
+      Iterator begin, Iterator end) const
+  {
+    Iterator iter = begin;
+    std::size_t accumulated_size = 0;
+
+    for (;;)
+    {
+      engine::want want = eng.handshake(type_, ec);
+      if (want != engine::want_input_and_retry
+          || bytes_transferred == total_buffer_size_)
+        return want;
+
+      // Find the next buffer piece to be fed to the engine.
+      while (iter != end)
+      {
+        const_buffer buffer(*iter);
+
+        // Skip over any buffers which have already been consumed by the engine.
+        if (bytes_transferred >= accumulated_size + buffer.size())
+        {
+          accumulated_size += buffer.size();
+          ++iter;
+          continue;
+        }
+
+        // The current buffer may have been partially consumed by the engine on
+        // a previous iteration. If so, adjust the buffer to point to the
+        // unused portion.
+        if (bytes_transferred > accumulated_size)
+          buffer = buffer + (bytes_transferred - accumulated_size);
+
+        // Pass the buffer to the engine, and update the bytes transferred to
+        // reflect the total number of bytes consumed so far.
+        bytes_transferred += buffer.size();
+        buffer = eng.put_input(buffer);
+        bytes_transferred -= buffer.size();
+        break;
+      }
+    }
+  }
+
+  stream_base::handshake_type type_;
+  ConstBufferSequence buffers_;
+  std::size_t total_buffer_size_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_BUFFERED_HANDSHAKE_OP_HPP
diff --git a/lib/asio/ssl/detail/engine.hpp b/lib/asio/ssl/detail/engine.hpp
new file mode 100644
index 0000000..2f033d6
--- /dev/null
+++ b/lib/asio/ssl/detail/engine.hpp
@@ -0,0 +1,160 @@
+//
+// ssl/detail/engine.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_ENGINE_HPP
+#define ASIO_SSL_DETAIL_ENGINE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/buffer.hpp"
+#include "asio/detail/static_mutex.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+#include "asio/ssl/detail/verify_callback.hpp"
+#include "asio/ssl/stream_base.hpp"
+#include "asio/ssl/verify_mode.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class engine
+{
+public:
+  enum want
+  {
+    // Returned by functions to indicate that the engine wants input. The input
+    // buffer should be updated to point to the data. The engine then needs to
+    // be called again to retry the operation.
+    want_input_and_retry = -2,
+
+    // Returned by functions to indicate that the engine wants to write output.
+    // The output buffer points to the data to be written. The engine then
+    // needs to be called again to retry the operation.
+    want_output_and_retry = -1,
+
+    // Returned by functions to indicate that the engine doesn't need input or
+    // output.
+    want_nothing = 0,
+
+    // Returned by functions to indicate that the engine wants to write output.
+    // The output buffer points to the data to be written. After that the
+    // operation is complete, and the engine does not need to be called again.
+    want_output = 1
+  };
+
+  // Construct a new engine for the specified context.
+  ASIO_DECL explicit engine(SSL_CTX* context);
+
+  // Destructor.
+  ASIO_DECL ~engine();
+
+  // Get the underlying implementation in the native type.
+  ASIO_DECL SSL* native_handle();
+
+  // Set the peer verification mode.
+  ASIO_DECL asio::error_code set_verify_mode(
+      verify_mode v, asio::error_code& ec);
+
+  // Set the peer verification depth.
+  ASIO_DECL asio::error_code set_verify_depth(
+      int depth, asio::error_code& ec);
+
+  // Set a peer certificate verification callback.
+  ASIO_DECL asio::error_code set_verify_callback(
+      verify_callback_base* callback, asio::error_code& ec);
+
+  // Perform an SSL handshake using either SSL_connect (client-side) or
+  // SSL_accept (server-side).
+  ASIO_DECL want handshake(
+      stream_base::handshake_type type, asio::error_code& ec);
+
+  // Perform a graceful shutdown of the SSL session.
+  ASIO_DECL want shutdown(asio::error_code& ec);
+
+  // Write bytes to the SSL session.
+  ASIO_DECL want write(const asio::const_buffer& data,
+      asio::error_code& ec, std::size_t& bytes_transferred);
+
+  // Read bytes from the SSL session.
+  ASIO_DECL want read(const asio::mutable_buffer& data,
+      asio::error_code& ec, std::size_t& bytes_transferred);
+
+  // Get output data to be written to the transport.
+  ASIO_DECL asio::mutable_buffer get_output(
+      const asio::mutable_buffer& data);
+
+  // Put input data that was read from the transport.
+  ASIO_DECL asio::const_buffer put_input(
+      const asio::const_buffer& data);
+
+  // Map an error::eof code returned by the underlying transport according to
+  // the type and state of the SSL session. Returns a const reference to the
+  // error code object, suitable for passing to a completion handler.
+  ASIO_DECL const asio::error_code& map_error_code(
+      asio::error_code& ec) const;
+
+private:
+  // Disallow copying and assignment.
+  engine(const engine&);
+  engine& operator=(const engine&);
+
+  // Callback used when the SSL implementation wants to verify a certificate.
+  ASIO_DECL static int verify_callback_function(
+      int preverified, X509_STORE_CTX* ctx);
+
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+  // The SSL_accept function may not be thread safe. This mutex is used to
+  // protect all calls to the SSL_accept function.
+  ASIO_DECL static asio::detail::static_mutex& accept_mutex();
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+
+  // Perform one operation. Returns >= 0 on success or error, want_read if the
+  // operation needs more input, or want_write if it needs to write some output
+  // before the operation can complete.
+  ASIO_DECL want perform(int (engine::* op)(void*, std::size_t),
+      void* data, std::size_t length, asio::error_code& ec,
+      std::size_t* bytes_transferred);
+
+  // Adapt the SSL_accept function to the signature needed for perform().
+  ASIO_DECL int do_accept(void*, std::size_t);
+
+  // Adapt the SSL_connect function to the signature needed for perform().
+  ASIO_DECL int do_connect(void*, std::size_t);
+
+  // Adapt the SSL_shutdown function to the signature needed for perform().
+  ASIO_DECL int do_shutdown(void*, std::size_t);
+
+  // Adapt the SSL_read function to the signature needed for perform().
+  ASIO_DECL int do_read(void* data, std::size_t length);
+
+  // Adapt the SSL_write function to the signature needed for perform().
+  ASIO_DECL int do_write(void* data, std::size_t length);
+
+  SSL* ssl_;
+  BIO* ext_bio_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ssl/detail/impl/engine.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_SSL_DETAIL_ENGINE_HPP
diff --git a/lib/asio/ssl/detail/handshake_op.hpp b/lib/asio/ssl/detail/handshake_op.hpp
new file mode 100644
index 0000000..f782023
--- /dev/null
+++ b/lib/asio/ssl/detail/handshake_op.hpp
@@ -0,0 +1,62 @@
+//
+// ssl/detail/handshake_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_HANDSHAKE_OP_HPP
+#define ASIO_SSL_DETAIL_HANDSHAKE_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/ssl/detail/engine.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class handshake_op
+{
+public:
+  handshake_op(stream_base::handshake_type type)
+    : type_(type)
+  {
+  }
+
+  engine::want operator()(engine& eng,
+      asio::error_code& ec,
+      std::size_t& bytes_transferred) const
+  {
+    bytes_transferred = 0;
+    return eng.handshake(type_, ec);
+  }
+
+  template <typename Handler>
+  void call_handler(Handler& handler,
+      const asio::error_code& ec,
+      const std::size_t&) const
+  {
+    handler(ec);
+  }
+
+private:
+  stream_base::handshake_type type_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_HANDSHAKE_OP_HPP
diff --git a/lib/asio/ssl/detail/impl/engine.ipp b/lib/asio/ssl/detail/impl/engine.ipp
new file mode 100644
index 0000000..e60e8d6
--- /dev/null
+++ b/lib/asio/ssl/detail/impl/engine.ipp
@@ -0,0 +1,322 @@
+//
+// ssl/detail/impl/engine.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_IMPL_ENGINE_IPP
+#define ASIO_SSL_DETAIL_IMPL_ENGINE_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/detail/throw_error.hpp"
+#include "asio/error.hpp"
+#include "asio/ssl/detail/engine.hpp"
+#include "asio/ssl/error.hpp"
+#include "asio/ssl/verify_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+engine::engine(SSL_CTX* context)
+  : ssl_(::SSL_new(context))
+{
+  if (!ssl_)
+  {
+    asio::error_code ec(
+        static_cast<int>(::ERR_get_error()),
+        asio::error::get_ssl_category());
+    asio::detail::throw_error(ec, "engine");
+  }
+
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+  accept_mutex().init();
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+
+  ::SSL_set_mode(ssl_, SSL_MODE_ENABLE_PARTIAL_WRITE);
+  ::SSL_set_mode(ssl_, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+#if defined(SSL_MODE_RELEASE_BUFFERS)
+  ::SSL_set_mode(ssl_, SSL_MODE_RELEASE_BUFFERS);
+#endif // defined(SSL_MODE_RELEASE_BUFFERS)
+
+  ::BIO* int_bio = 0;
+  ::BIO_new_bio_pair(&int_bio, 0, &ext_bio_, 0);
+  ::SSL_set_bio(ssl_, int_bio, int_bio);
+}
+
+engine::~engine()
+{
+  if (SSL_get_app_data(ssl_))
+  {
+    delete static_cast<verify_callback_base*>(SSL_get_app_data(ssl_));
+    SSL_set_app_data(ssl_, 0);
+  }
+
+  ::BIO_free(ext_bio_);
+  ::SSL_free(ssl_);
+}
+
+SSL* engine::native_handle()
+{
+  return ssl_;
+}
+
+asio::error_code engine::set_verify_mode(
+    verify_mode v, asio::error_code& ec)
+{
+  ::SSL_set_verify(ssl_, v, ::SSL_get_verify_callback(ssl_));
+
+  ec = asio::error_code();
+  return ec;
+}
+
+asio::error_code engine::set_verify_depth(
+    int depth, asio::error_code& ec)
+{
+  ::SSL_set_verify_depth(ssl_, depth);
+
+  ec = asio::error_code();
+  return ec;
+}
+
+asio::error_code engine::set_verify_callback(
+    verify_callback_base* callback, asio::error_code& ec)
+{
+  if (SSL_get_app_data(ssl_))
+    delete static_cast<verify_callback_base*>(SSL_get_app_data(ssl_));
+
+  SSL_set_app_data(ssl_, callback);
+
+  ::SSL_set_verify(ssl_, ::SSL_get_verify_mode(ssl_),
+      &engine::verify_callback_function);
+
+  ec = asio::error_code();
+  return ec;
+}
+
+int engine::verify_callback_function(int preverified, X509_STORE_CTX* ctx)
+{
+  if (ctx)
+  {
+    if (SSL* ssl = static_cast<SSL*>(
+          ::X509_STORE_CTX_get_ex_data(
+            ctx, ::SSL_get_ex_data_X509_STORE_CTX_idx())))
+    {
+      if (SSL_get_app_data(ssl))
+      {
+        verify_callback_base* callback =
+          static_cast<verify_callback_base*>(
+              SSL_get_app_data(ssl));
+
+        verify_context verify_ctx(ctx);
+        return callback->call(preverified != 0, verify_ctx) ? 1 : 0;
+      }
+    }
+  }
+
+  return 0;
+}
+
+engine::want engine::handshake(
+    stream_base::handshake_type type, asio::error_code& ec)
+{
+  return perform((type == asio::ssl::stream_base::client)
+      ? &engine::do_connect : &engine::do_accept, 0, 0, ec, 0);
+}
+
+engine::want engine::shutdown(asio::error_code& ec)
+{
+  return perform(&engine::do_shutdown, 0, 0, ec, 0);
+}
+
+engine::want engine::write(const asio::const_buffer& data,
+    asio::error_code& ec, std::size_t& bytes_transferred)
+{
+  if (data.size() == 0)
+  {
+    ec = asio::error_code();
+    return engine::want_nothing;
+  }
+
+  return perform(&engine::do_write,
+      const_cast<void*>(data.data()),
+      data.size(), ec, &bytes_transferred);
+}
+
+engine::want engine::read(const asio::mutable_buffer& data,
+    asio::error_code& ec, std::size_t& bytes_transferred)
+{
+  if (data.size() == 0)
+  {
+    ec = asio::error_code();
+    return engine::want_nothing;
+  }
+
+  return perform(&engine::do_read, data.data(),
+      data.size(), ec, &bytes_transferred);
+}
+
+asio::mutable_buffer engine::get_output(
+    const asio::mutable_buffer& data)
+{
+  int length = ::BIO_read(ext_bio_,
+      data.data(), static_cast<int>(data.size()));
+
+  return asio::buffer(data,
+      length > 0 ? static_cast<std::size_t>(length) : 0);
+}
+
+asio::const_buffer engine::put_input(
+    const asio::const_buffer& data)
+{
+  int length = ::BIO_write(ext_bio_,
+      data.data(), static_cast<int>(data.size()));
+
+  return asio::buffer(data +
+      (length > 0 ? static_cast<std::size_t>(length) : 0));
+}
+
+const asio::error_code& engine::map_error_code(
+    asio::error_code& ec) const
+{
+  // We only want to map the error::eof code.
+  if (ec != asio::error::eof)
+    return ec;
+
+  // If there's data yet to be read, it's an error.
+  if (BIO_wpending(ext_bio_))
+  {
+    ec = asio::ssl::error::stream_truncated;
+    return ec;
+  }
+
+  // SSL v2 doesn't provide a protocol-level shutdown, so an eof on the
+  // underlying transport is passed through.
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
+  if (SSL_version(ssl_) == SSL2_VERSION)
+    return ec;
+#endif // (OPENSSL_VERSION_NUMBER < 0x10100000L)
+
+  // Otherwise, the peer should have negotiated a proper shutdown.
+  if ((::SSL_get_shutdown(ssl_) & SSL_RECEIVED_SHUTDOWN) == 0)
+  {
+    ec = asio::ssl::error::stream_truncated;
+  }
+
+  return ec;
+}
+
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+asio::detail::static_mutex& engine::accept_mutex()
+{
+  static asio::detail::static_mutex mutex = ASIO_STATIC_MUTEX_INIT;
+  return mutex;
+}
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+
+engine::want engine::perform(int (engine::* op)(void*, std::size_t),
+    void* data, std::size_t length, asio::error_code& ec,
+    std::size_t* bytes_transferred)
+{
+  std::size_t pending_output_before = ::BIO_ctrl_pending(ext_bio_);
+  ::ERR_clear_error();
+  int result = (this->*op)(data, length);
+  int ssl_error = ::SSL_get_error(ssl_, result);
+  int sys_error = static_cast<int>(::ERR_get_error());
+  std::size_t pending_output_after = ::BIO_ctrl_pending(ext_bio_);
+
+  if (ssl_error == SSL_ERROR_SSL)
+  {
+    ec = asio::error_code(sys_error,
+        asio::error::get_ssl_category());
+    return want_nothing;
+  }
+
+  if (ssl_error == SSL_ERROR_SYSCALL)
+  {
+    ec = asio::error_code(sys_error,
+        asio::error::get_system_category());
+    return want_nothing;
+  }
+
+  if (result > 0 && bytes_transferred)
+    *bytes_transferred = static_cast<std::size_t>(result);
+
+  if (ssl_error == SSL_ERROR_WANT_WRITE)
+  {
+    ec = asio::error_code();
+    return want_output_and_retry;
+  }
+  else if (pending_output_after > pending_output_before)
+  {
+    ec = asio::error_code();
+    return result > 0 ? want_output : want_output_and_retry;
+  }
+  else if (ssl_error == SSL_ERROR_WANT_READ)
+  {
+    ec = asio::error_code();
+    return want_input_and_retry;
+  }
+  else if (::SSL_get_shutdown(ssl_) & SSL_RECEIVED_SHUTDOWN)
+  {
+    ec = asio::error::eof;
+    return want_nothing;
+  }
+  else
+  {
+    ec = asio::error_code();
+    return want_nothing;
+  }
+}
+
+int engine::do_accept(void*, std::size_t)
+{
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+  asio::detail::static_mutex::scoped_lock lock(accept_mutex());
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+  return ::SSL_accept(ssl_);
+}
+
+int engine::do_connect(void*, std::size_t)
+{
+  return ::SSL_connect(ssl_);
+}
+
+int engine::do_shutdown(void*, std::size_t)
+{
+  int result = ::SSL_shutdown(ssl_);
+  if (result == 0)
+    result = ::SSL_shutdown(ssl_);
+  return result;
+}
+
+int engine::do_read(void* data, std::size_t length)
+{
+  return ::SSL_read(ssl_, data,
+      length < INT_MAX ? static_cast<int>(length) : INT_MAX);
+}
+
+int engine::do_write(void* data, std::size_t length)
+{
+  return ::SSL_write(ssl_, data,
+      length < INT_MAX ? static_cast<int>(length) : INT_MAX);
+}
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_IMPL_ENGINE_IPP
diff --git a/lib/asio/ssl/detail/impl/openssl_init.ipp b/lib/asio/ssl/detail/impl/openssl_init.ipp
new file mode 100644
index 0000000..fb0fff9
--- /dev/null
+++ b/lib/asio/ssl/detail/impl/openssl_init.ipp
@@ -0,0 +1,165 @@
+//
+// ssl/detail/impl/openssl_init.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2005 Voipster / Indrek dot Juhani at voipster dot com
+// Copyright (c) 2005-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_IMPL_OPENSSL_INIT_IPP
+#define ASIO_SSL_DETAIL_IMPL_OPENSSL_INIT_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <vector>
+#include "asio/detail/assert.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/tss_ptr.hpp"
+#include "asio/ssl/detail/openssl_init.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class openssl_init_base::do_init
+{
+public:
+  do_init()
+  {
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
+    ::SSL_library_init();
+    ::SSL_load_error_strings();        
+    ::OpenSSL_add_all_algorithms();
+
+    mutexes_.resize(::CRYPTO_num_locks());
+    for (size_t i = 0; i < mutexes_.size(); ++i)
+      mutexes_[i].reset(new asio::detail::mutex);
+    ::CRYPTO_set_locking_callback(&do_init::openssl_locking_func);
+#endif // (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+    ::CRYPTO_set_id_callback(&do_init::openssl_id_func);
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+    null_compression_methods_ = sk_SSL_COMP_new_null();
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+  }
+
+  ~do_init()
+  {
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+    sk_SSL_COMP_free(null_compression_methods_);
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+    ::CRYPTO_set_id_callback(0);
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
+    ::CRYPTO_set_locking_callback(0);
+    ::ERR_free_strings();
+    ::EVP_cleanup();
+    ::CRYPTO_cleanup_all_ex_data();
+#endif // (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+    ::ERR_remove_state(0);
+#elif (OPENSSL_VERSION_NUMBER < 0x10100000L)
+    ::ERR_remove_thread_state(NULL);
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+#if (OPENSSL_VERSION_NUMBER >= 0x10002000L) \
+    && (OPENSSL_VERSION_NUMBER < 0x10100000L) \
+    && !defined(SSL_OP_NO_COMPRESSION)
+    ::SSL_COMP_free_compression_methods();
+#endif // (OPENSSL_VERSION_NUMBER >= 0x10002000L)
+       // && (OPENSSL_VERSION_NUMBER < 0x10100000L)
+       // && !defined(SSL_OP_NO_COMPRESSION)
+#if !defined(OPENSSL_IS_BORINGSSL)
+    ::CONF_modules_unload(1);
+#endif // !defined(OPENSSL_IS_BORINGSSL)
+#if !defined(OPENSSL_NO_ENGINE) \
+  && (OPENSSL_VERSION_NUMBER < 0x10100000L)
+    ::ENGINE_cleanup();
+#endif // !defined(OPENSSL_NO_ENGINE)
+       // && (OPENSSL_VERSION_NUMBER < 0x10100000L)
+  }
+
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+  STACK_OF(SSL_COMP)* get_null_compression_methods() const
+  {
+    return null_compression_methods_;
+  }
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+
+private:
+#if (OPENSSL_VERSION_NUMBER < 0x10000000L)
+  static unsigned long openssl_id_func()
+  {
+#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
+    return ::GetCurrentThreadId();
+#else // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
+    void* id = &errno;
+    ASIO_ASSERT(sizeof(unsigned long) >= sizeof(void*));
+    return reinterpret_cast<unsigned long>(id);
+#endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
+  }
+#endif // (OPENSSL_VERSION_NUMBER < 0x10000000L)
+
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
+  static void openssl_locking_func(int mode, int n, 
+    const char* /*file*/, int /*line*/)
+  {
+    if (mode & CRYPTO_LOCK)
+      instance()->mutexes_[n]->lock();
+    else
+      instance()->mutexes_[n]->unlock();
+  }
+
+  // Mutexes to be used in locking callbacks.
+  std::vector<asio::detail::shared_ptr<
+        asio::detail::mutex> > mutexes_;
+#endif // (OPENSSL_VERSION_NUMBER < 0x10100000L)
+
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+  STACK_OF(SSL_COMP)* null_compression_methods_;
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+};
+
+asio::detail::shared_ptr<openssl_init_base::do_init>
+openssl_init_base::instance()
+{
+  static asio::detail::shared_ptr<do_init> init(new do_init);
+  return init;
+}
+
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+STACK_OF(SSL_COMP)* openssl_init_base::get_null_compression_methods()
+{
+  return instance()->get_null_compression_methods();
+}
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_IMPL_OPENSSL_INIT_IPP
diff --git a/lib/asio/ssl/detail/io.hpp b/lib/asio/ssl/detail/io.hpp
new file mode 100644
index 0000000..0b0e51a
--- /dev/null
+++ b/lib/asio/ssl/detail/io.hpp
@@ -0,0 +1,372 @@
+//
+// ssl/detail/io.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_IO_HPP
+#define ASIO_SSL_DETAIL_IO_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/ssl/detail/engine.hpp"
+#include "asio/ssl/detail/stream_core.hpp"
+#include "asio/write.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+template <typename Stream, typename Operation>
+std::size_t io(Stream& next_layer, stream_core& core,
+    const Operation& op, asio::error_code& ec)
+{
+  std::size_t bytes_transferred = 0;
+  do switch (op(core.engine_, ec, bytes_transferred))
+  {
+  case engine::want_input_and_retry:
+
+    // If the input buffer is empty then we need to read some more data from
+    // the underlying transport.
+    if (core.input_.size() == 0)
+      core.input_ = asio::buffer(core.input_buffer_,
+          next_layer.read_some(core.input_buffer_, ec));
+
+    // Pass the new input data to the engine.
+    core.input_ = core.engine_.put_input(core.input_);
+
+    // Try the operation again.
+    continue;
+
+  case engine::want_output_and_retry:
+
+    // Get output data from the engine and write it to the underlying
+    // transport.
+    asio::write(next_layer,
+        core.engine_.get_output(core.output_buffer_), ec);
+
+    // Try the operation again.
+    continue;
+
+  case engine::want_output:
+
+    // Get output data from the engine and write it to the underlying
+    // transport.
+    asio::write(next_layer,
+        core.engine_.get_output(core.output_buffer_), ec);
+
+    // Operation is complete. Return result to caller.
+    core.engine_.map_error_code(ec);
+    return bytes_transferred;
+
+  default:
+
+    // Operation is complete. Return result to caller.
+    core.engine_.map_error_code(ec);
+    return bytes_transferred;
+
+  } while (!ec);
+
+  // Operation failed. Return result to caller.
+  core.engine_.map_error_code(ec);
+  return 0;
+}
+
+template <typename Stream, typename Operation, typename Handler>
+class io_op
+{
+public:
+  io_op(Stream& next_layer, stream_core& core,
+      const Operation& op, Handler& handler)
+    : next_layer_(next_layer),
+      core_(core),
+      op_(op),
+      start_(0),
+      want_(engine::want_nothing),
+      bytes_transferred_(0),
+      handler_(ASIO_MOVE_CAST(Handler)(handler))
+  {
+  }
+
+#if defined(ASIO_HAS_MOVE)
+  io_op(const io_op& other)
+    : next_layer_(other.next_layer_),
+      core_(other.core_),
+      op_(other.op_),
+      start_(other.start_),
+      want_(other.want_),
+      ec_(other.ec_),
+      bytes_transferred_(other.bytes_transferred_),
+      handler_(other.handler_)
+  {
+  }
+
+  io_op(io_op&& other)
+    : next_layer_(other.next_layer_),
+      core_(other.core_),
+      op_(ASIO_MOVE_CAST(Operation)(other.op_)),
+      start_(other.start_),
+      want_(other.want_),
+      ec_(other.ec_),
+      bytes_transferred_(other.bytes_transferred_),
+      handler_(ASIO_MOVE_CAST(Handler)(other.handler_))
+  {
+  }
+#endif // defined(ASIO_HAS_MOVE)
+
+  void operator()(asio::error_code ec,
+      std::size_t bytes_transferred = ~std::size_t(0), int start = 0)
+  {
+    switch (start_ = start)
+    {
+    case 1: // Called after at least one async operation.
+      do
+      {
+        switch (want_ = op_(core_.engine_, ec_, bytes_transferred_))
+        {
+        case engine::want_input_and_retry:
+
+          // If the input buffer already has data in it we can pass it to the
+          // engine and then retry the operation immediately.
+          if (core_.input_.size() != 0)
+          {
+            core_.input_ = core_.engine_.put_input(core_.input_);
+            continue;
+          }
+
+          // The engine wants more data to be read from input. However, we
+          // cannot allow more than one read operation at a time on the
+          // underlying transport. The pending_read_ timer's expiry is set to
+          // pos_infin if a read is in progress, and neg_infin otherwise.
+          if (core_.expiry(core_.pending_read_) == core_.neg_infin())
+          {
+            // Prevent other read operations from being started.
+            core_.pending_read_.expires_at(core_.pos_infin());
+
+            // Start reading some data from the underlying transport.
+            next_layer_.async_read_some(
+                asio::buffer(core_.input_buffer_),
+                ASIO_MOVE_CAST(io_op)(*this));
+          }
+          else
+          {
+            // Wait until the current read operation completes.
+            core_.pending_read_.async_wait(ASIO_MOVE_CAST(io_op)(*this));
+          }
+
+          // Yield control until asynchronous operation completes. Control
+          // resumes at the "default:" label below.
+          return;
+
+        case engine::want_output_and_retry:
+        case engine::want_output:
+
+          // The engine wants some data to be written to the output. However, we
+          // cannot allow more than one write operation at a time on the
+          // underlying transport. The pending_write_ timer's expiry is set to
+          // pos_infin if a write is in progress, and neg_infin otherwise.
+          if (core_.expiry(core_.pending_write_) == core_.neg_infin())
+          {
+            // Prevent other write operations from being started.
+            core_.pending_write_.expires_at(core_.pos_infin());
+
+            // Start writing all the data to the underlying transport.
+            asio::async_write(next_layer_,
+                core_.engine_.get_output(core_.output_buffer_),
+                ASIO_MOVE_CAST(io_op)(*this));
+          }
+          else
+          {
+            // Wait until the current write operation completes.
+            core_.pending_write_.async_wait(ASIO_MOVE_CAST(io_op)(*this));
+          }
+
+          // Yield control until asynchronous operation completes. Control
+          // resumes at the "default:" label below.
+          return;
+
+        default:
+
+          // The SSL operation is done and we can invoke the handler, but we
+          // have to keep in mind that this function might be being called from
+          // the async operation's initiating function. In this case we're not
+          // allowed to call the handler directly. Instead, issue a zero-sized
+          // read so the handler runs "as-if" posted using io_context::post().
+          if (start)
+          {
+            next_layer_.async_read_some(
+                asio::buffer(core_.input_buffer_, 0),
+                ASIO_MOVE_CAST(io_op)(*this));
+
+            // Yield control until asynchronous operation completes. Control
+            // resumes at the "default:" label below.
+            return;
+          }
+          else
+          {
+            // Continue on to run handler directly.
+            break;
+          }
+        }
+
+        default:
+        if (bytes_transferred == ~std::size_t(0))
+          bytes_transferred = 0; // Timer cancellation, no data transferred.
+        else if (!ec_)
+          ec_ = ec;
+
+        switch (want_)
+        {
+        case engine::want_input_and_retry:
+
+          // Add received data to the engine's input.
+          core_.input_ = asio::buffer(
+              core_.input_buffer_, bytes_transferred);
+          core_.input_ = core_.engine_.put_input(core_.input_);
+
+          // Release any waiting read operations.
+          core_.pending_read_.expires_at(core_.neg_infin());
+
+          // Try the operation again.
+          continue;
+
+        case engine::want_output_and_retry:
+
+          // Release any waiting write operations.
+          core_.pending_write_.expires_at(core_.neg_infin());
+
+          // Try the operation again.
+          continue;
+
+        case engine::want_output:
+
+          // Release any waiting write operations.
+          core_.pending_write_.expires_at(core_.neg_infin());
+
+          // Fall through to call handler.
+
+        default:
+
+          // Pass the result to the handler.
+          op_.call_handler(handler_,
+              core_.engine_.map_error_code(ec_),
+              ec_ ? 0 : bytes_transferred_);
+
+          // Our work here is done.
+          return;
+        }
+      } while (!ec_);
+
+      // Operation failed. Pass the result to the handler.
+      op_.call_handler(handler_, core_.engine_.map_error_code(ec_), 0);
+    }
+  }
+
+//private:
+  Stream& next_layer_;
+  stream_core& core_;
+  Operation op_;
+  int start_;
+  engine::want want_;
+  asio::error_code ec_;
+  std::size_t bytes_transferred_;
+  Handler handler_;
+};
+
+template <typename Stream, typename Operation, typename Handler>
+inline void* asio_handler_allocate(std::size_t size,
+    io_op<Stream, Operation, Handler>* this_handler)
+{
+  return asio_handler_alloc_helpers::allocate(
+      size, this_handler->handler_);
+}
+
+template <typename Stream, typename Operation, typename Handler>
+inline void asio_handler_deallocate(void* pointer, std::size_t size,
+    io_op<Stream, Operation, Handler>* this_handler)
+{
+  asio_handler_alloc_helpers::deallocate(
+      pointer, size, this_handler->handler_);
+}
+
+template <typename Stream, typename Operation, typename Handler>
+inline bool asio_handler_is_continuation(
+    io_op<Stream, Operation, Handler>* this_handler)
+{
+  return this_handler->start_ == 0 ? true
+    : asio_handler_cont_helpers::is_continuation(this_handler->handler_);
+}
+
+template <typename Function, typename Stream,
+    typename Operation, typename Handler>
+inline void asio_handler_invoke(Function& function,
+    io_op<Stream, Operation, Handler>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Function, typename Stream,
+    typename Operation, typename Handler>
+inline void asio_handler_invoke(const Function& function,
+    io_op<Stream, Operation, Handler>* this_handler)
+{
+  asio_handler_invoke_helpers::invoke(
+      function, this_handler->handler_);
+}
+
+template <typename Stream, typename Operation, typename Handler>
+inline void async_io(Stream& next_layer, stream_core& core,
+    const Operation& op, Handler& handler)
+{
+  io_op<Stream, Operation, Handler>(
+    next_layer, core, op, handler)(
+      asio::error_code(), 0, 1);
+}
+
+} // namespace detail
+} // namespace ssl
+
+template <typename Stream, typename Operation,
+    typename Handler, typename Allocator>
+struct associated_allocator<
+    ssl::detail::io_op<Stream, Operation, Handler>, Allocator>
+{
+  typedef typename associated_allocator<Handler, Allocator>::type type;
+
+  static type get(const ssl::detail::io_op<Stream, Operation, Handler>& h,
+      const Allocator& a = Allocator()) ASIO_NOEXCEPT
+  {
+    return associated_allocator<Handler, Allocator>::get(h.handler_, a);
+  }
+};
+
+template <typename Stream, typename Operation,
+    typename Handler, typename Executor>
+struct associated_executor<
+    ssl::detail::io_op<Stream, Operation, Handler>, Executor>
+{
+  typedef typename associated_executor<Handler, Executor>::type type;
+
+  static type get(const ssl::detail::io_op<Stream, Operation, Handler>& h,
+      const Executor& ex = Executor()) ASIO_NOEXCEPT
+  {
+    return associated_executor<Handler, Executor>::get(h.handler_, ex);
+  }
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_IO_HPP
diff --git a/lib/asio/ssl/detail/openssl_init.hpp b/lib/asio/ssl/detail/openssl_init.hpp
new file mode 100644
index 0000000..c3e4727
--- /dev/null
+++ b/lib/asio/ssl/detail/openssl_init.hpp
@@ -0,0 +1,101 @@
+//
+// ssl/detail/openssl_init.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <cstring>
+#include "asio/detail/memory.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/ssl/detail/openssl_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class openssl_init_base
+  : private noncopyable
+{
+protected:
+  // Class that performs the actual initialisation.
+  class do_init;
+
+  // Helper function to manage a do_init singleton. The static instance of the
+  // openssl_init object ensures that this function is always called before
+  // main, and therefore before any other threads can get started. The do_init
+  // instance must be static in this function to ensure that it gets
+  // initialised before any other global objects try to use it.
+  ASIO_DECL static asio::detail::shared_ptr<do_init> instance();
+
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+  // Get an empty stack of compression methods, to be used when disabling
+  // compression.
+  ASIO_DECL static STACK_OF(SSL_COMP)* get_null_compression_methods();
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+};
+
+template <bool Do_Init = true>
+class openssl_init : private openssl_init_base
+{
+public:
+  // Constructor.
+  openssl_init()
+    : ref_(instance())
+  {
+    using namespace std; // For memmove.
+
+    // Ensure openssl_init::instance_ is linked in.
+    openssl_init* tmp = &instance_;
+    memmove(&tmp, &tmp, sizeof(openssl_init*));
+  }
+
+  // Destructor.
+  ~openssl_init()
+  {
+  }
+
+#if !defined(SSL_OP_NO_COMPRESSION) \
+  && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+  using openssl_init_base::get_null_compression_methods;
+#endif // !defined(SSL_OP_NO_COMPRESSION)
+       // && (OPENSSL_VERSION_NUMBER >= 0x00908000L)
+
+private:
+  // Instance to force initialisation of openssl at global scope.
+  static openssl_init instance_;
+
+  // Reference to singleton do_init object to ensure that openssl does not get
+  // cleaned up until the last user has finished with it.
+  asio::detail::shared_ptr<do_init> ref_;
+};
+
+template <bool Do_Init>
+openssl_init<Do_Init> openssl_init<Do_Init>::instance_;
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ssl/detail/impl/openssl_init.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_INIT_HPP
diff --git a/lib/asio/ssl/detail/openssl_types.hpp b/lib/asio/ssl/detail/openssl_types.hpp
new file mode 100644
index 0000000..a044af3
--- /dev/null
+++ b/lib/asio/ssl/detail/openssl_types.hpp
@@ -0,0 +1,30 @@
+//
+// ssl/detail/openssl_types.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_OPENSSL_TYPES_HPP
+#define ASIO_SSL_DETAIL_OPENSSL_TYPES_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/socket_types.hpp"
+#include <openssl/conf.h>
+#include <openssl/ssl.h>
+#if !defined(OPENSSL_NO_ENGINE)
+# include <openssl/engine.h>
+#endif // !defined(OPENSSL_NO_ENGINE)
+#include <openssl/dh.h>
+#include <openssl/err.h>
+#include <openssl/rsa.h>
+#include <openssl/x509v3.h>
+
+#endif // ASIO_SSL_DETAIL_OPENSSL_TYPES_HPP
diff --git a/lib/asio/ssl/detail/password_callback.hpp b/lib/asio/ssl/detail/password_callback.hpp
new file mode 100644
index 0000000..9b1dbee
--- /dev/null
+++ b/lib/asio/ssl/detail/password_callback.hpp
@@ -0,0 +1,66 @@
+//
+// ssl/detail/password_callback.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_PASSWORD_CALLBACK_HPP
+#define ASIO_SSL_DETAIL_PASSWORD_CALLBACK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include <cstddef>
+#include <string>
+#include "asio/ssl/context_base.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class password_callback_base
+{
+public:
+  virtual ~password_callback_base()
+  {
+  }
+
+  virtual std::string call(std::size_t size,
+      context_base::password_purpose purpose) = 0;
+};
+
+template <typename PasswordCallback>
+class password_callback : public password_callback_base
+{
+public:
+  explicit password_callback(PasswordCallback callback)
+    : callback_(callback)
+  {
+  }
+
+  virtual std::string call(std::size_t size,
+      context_base::password_purpose purpose)
+  {
+    return callback_(size, purpose);
+  }
+
+private:
+  PasswordCallback callback_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_PASSWORD_CALLBACK_HPP
diff --git a/lib/asio/ssl/detail/read_op.hpp b/lib/asio/ssl/detail/read_op.hpp
new file mode 100644
index 0000000..b0d6de2
--- /dev/null
+++ b/lib/asio/ssl/detail/read_op.hpp
@@ -0,0 +1,67 @@
+//
+// ssl/detail/read_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_READ_OP_HPP
+#define ASIO_SSL_DETAIL_READ_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/ssl/detail/engine.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+template <typename MutableBufferSequence>
+class read_op
+{
+public:
+  read_op(const MutableBufferSequence& buffers)
+    : buffers_(buffers)
+  {
+  }
+
+  engine::want operator()(engine& eng,
+      asio::error_code& ec,
+      std::size_t& bytes_transferred) const
+  {
+    asio::mutable_buffer buffer =
+      asio::detail::buffer_sequence_adapter<asio::mutable_buffer,
+        MutableBufferSequence>::first(buffers_);
+
+    return eng.read(buffer, ec, bytes_transferred);
+  }
+
+  template <typename Handler>
+  void call_handler(Handler& handler,
+      const asio::error_code& ec,
+      const std::size_t& bytes_transferred) const
+  {
+    handler(ec, bytes_transferred);
+  }
+
+private:
+  MutableBufferSequence buffers_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_READ_OP_HPP
diff --git a/lib/asio/ssl/detail/shutdown_op.hpp b/lib/asio/ssl/detail/shutdown_op.hpp
new file mode 100644
index 0000000..d20b430
--- /dev/null
+++ b/lib/asio/ssl/detail/shutdown_op.hpp
@@ -0,0 +1,54 @@
+//
+// ssl/detail/shutdown_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_SHUTDOWN_OP_HPP
+#define ASIO_SSL_DETAIL_SHUTDOWN_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/ssl/detail/engine.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class shutdown_op
+{
+public:
+  engine::want operator()(engine& eng,
+      asio::error_code& ec,
+      std::size_t& bytes_transferred) const
+  {
+    bytes_transferred = 0;
+    return eng.shutdown(ec);
+  }
+
+  template <typename Handler>
+  void call_handler(Handler& handler,
+      const asio::error_code& ec,
+      const std::size_t&) const
+  {
+    handler(ec);
+  }
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_SHUTDOWN_OP_HPP
diff --git a/lib/asio/ssl/detail/stream_core.hpp b/lib/asio/ssl/detail/stream_core.hpp
new file mode 100644
index 0000000..13fde74
--- /dev/null
+++ b/lib/asio/ssl/detail/stream_core.hpp
@@ -0,0 +1,134 @@
+//
+// ssl/detail/stream_core.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_STREAM_CORE_HPP
+#define ASIO_SSL_DETAIL_STREAM_CORE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_BOOST_DATE_TIME)
+# include "asio/deadline_timer.hpp"
+#else // defined(ASIO_HAS_BOOST_DATE_TIME)
+# include "asio/steady_timer.hpp"
+#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
+#include "asio/ssl/detail/engine.hpp"
+#include "asio/buffer.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+struct stream_core
+{
+  // According to the OpenSSL documentation, this is the buffer size that is
+  // sufficient to hold the largest possible TLS record.
+  enum { max_tls_record_size = 17 * 1024 };
+
+  stream_core(SSL_CTX* context, asio::io_context& io_context)
+    : engine_(context),
+      pending_read_(io_context),
+      pending_write_(io_context),
+      output_buffer_space_(max_tls_record_size),
+      output_buffer_(asio::buffer(output_buffer_space_)),
+      input_buffer_space_(max_tls_record_size),
+      input_buffer_(asio::buffer(input_buffer_space_))
+  {
+    pending_read_.expires_at(neg_infin());
+    pending_write_.expires_at(neg_infin());
+  }
+
+  ~stream_core()
+  {
+  }
+
+  // The SSL engine.
+  engine engine_;
+
+#if defined(ASIO_HAS_BOOST_DATE_TIME)
+  // Timer used for storing queued read operations.
+  asio::deadline_timer pending_read_;
+
+  // Timer used for storing queued write operations.
+  asio::deadline_timer pending_write_;
+
+  // Helper function for obtaining a time value that always fires.
+  static asio::deadline_timer::time_type neg_infin()
+  {
+    return boost::posix_time::neg_infin;
+  }
+
+  // Helper function for obtaining a time value that never fires.
+  static asio::deadline_timer::time_type pos_infin()
+  {
+    return boost::posix_time::pos_infin;
+  }
+
+  // Helper function to get a timer's expiry time.
+  static asio::deadline_timer::time_type expiry(
+      const asio::deadline_timer& timer)
+  {
+    return timer.expires_at();
+  }
+#else // defined(ASIO_HAS_BOOST_DATE_TIME)
+  // Timer used for storing queued read operations.
+  asio::steady_timer pending_read_;
+
+  // Timer used for storing queued write operations.
+  asio::steady_timer pending_write_;
+
+  // Helper function for obtaining a time value that always fires.
+  static asio::steady_timer::time_point neg_infin()
+  {
+    return (asio::steady_timer::time_point::min)();
+  }
+
+  // Helper function for obtaining a time value that never fires.
+  static asio::steady_timer::time_point pos_infin()
+  {
+    return (asio::steady_timer::time_point::max)();
+  }
+
+  // Helper function to get a timer's expiry time.
+  static asio::steady_timer::time_point expiry(
+      const asio::steady_timer& timer)
+  {
+    return timer.expiry();
+  }
+#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
+
+  // Buffer space used to prepare output intended for the transport.
+  std::vector<unsigned char> output_buffer_space_;
+
+  // A buffer that may be used to prepare output intended for the transport.
+  const asio::mutable_buffer output_buffer_;
+
+  // Buffer space used to read input intended for the engine.
+  std::vector<unsigned char> input_buffer_space_;
+
+  // A buffer that may be used to read input intended for the engine.
+  const asio::mutable_buffer input_buffer_;
+
+  // The buffer pointing to the engine's unconsumed input.
+  asio::const_buffer input_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_STREAM_CORE_HPP
diff --git a/lib/asio/ssl/detail/verify_callback.hpp b/lib/asio/ssl/detail/verify_callback.hpp
new file mode 100644
index 0000000..1c56a27
--- /dev/null
+++ b/lib/asio/ssl/detail/verify_callback.hpp
@@ -0,0 +1,62 @@
+//
+// ssl/detail/verify_callback.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_VERIFY_CALLBACK_HPP
+#define ASIO_SSL_DETAIL_VERIFY_CALLBACK_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/ssl/verify_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+class verify_callback_base
+{
+public:
+  virtual ~verify_callback_base()
+  {
+  }
+
+  virtual bool call(bool preverified, verify_context& ctx) = 0;
+};
+
+template <typename VerifyCallback>
+class verify_callback : public verify_callback_base
+{
+public:
+  explicit verify_callback(VerifyCallback callback)
+    : callback_(callback)
+  {
+  }
+
+  virtual bool call(bool preverified, verify_context& ctx)
+  {
+    return callback_(preverified, ctx);
+  }
+
+private:
+  VerifyCallback callback_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_VERIFY_CALLBACK_HPP
diff --git a/lib/asio/ssl/detail/write_op.hpp b/lib/asio/ssl/detail/write_op.hpp
new file mode 100644
index 0000000..1d341c0
--- /dev/null
+++ b/lib/asio/ssl/detail/write_op.hpp
@@ -0,0 +1,67 @@
+//
+// ssl/detail/write_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_SSL_DETAIL_WRITE_OP_HPP
+#define ASIO_SSL_DETAIL_WRITE_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/ssl/detail/engine.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+namespace detail {
+
+template <typename ConstBufferSequence>
+class write_op
+{
+public:
+  write_op(const ConstBufferSequence& buffers)
+    : buffers_(buffers)
+  {
+  }
+
+  engine::want operator()(engine& eng,
+      asio::error_code& ec,
+      std::size_t& bytes_transferred) const
+  {
+    asio::const_buffer buffer =
+      asio::detail::buffer_sequence_adapter<asio::const_buffer,
+        ConstBufferSequence>::first(buffers_);
+
+    return eng.write(buffer, ec, bytes_transferred);
+  }
+
+  template <typename Handler>
+  void call_handler(Handler& handler,
+      const asio::error_code& ec,
+      const std::size_t& bytes_transferred) const
+  {
+    handler(ec, bytes_transferred);
+  }
+
+private:
+  ConstBufferSequence buffers_;
+};
+
+} // namespace detail
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_SSL_DETAIL_WRITE_OP_HPP