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diff --git a/lib/asio/ssl/rfc2818_verification.hpp b/lib/asio/ssl/rfc2818_verification.hpp
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+//
+// ssl/rfc2818_verification.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_RFC2818_VERIFICATION_HPP
+#define ASIO_SSL_RFC2818_VERIFICATION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include <string>
+#include "asio/ssl/detail/openssl_types.hpp"
+#include "asio/ssl/verify_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ssl {
+
+/// Verifies a certificate against a hostname according to the rules described
+/// in RFC 2818.
+/**
+ * @par Example
+ * The following example shows how to synchronously open a secure connection to
+ * a given host name:
+ * @code
+ * using asio::ip::tcp;
+ * namespace ssl = asio::ssl;
+ * typedef ssl::stream<tcp::socket> ssl_socket;
+ *
+ * // Create a context that uses the default paths for finding CA certificates.
+ * ssl::context ctx(ssl::context::sslv23);
+ * ctx.set_default_verify_paths();
+ *
+ * // Open a socket and connect it to the remote host.
+ * asio::io_context io_context;
+ * ssl_socket sock(io_context, ctx);
+ * tcp::resolver resolver(io_context);
+ * tcp::resolver::query query("host.name", "https");
+ * asio::connect(sock.lowest_layer(), resolver.resolve(query));
+ * sock.lowest_layer().set_option(tcp::no_delay(true));
+ *
+ * // Perform SSL handshake and verify the remote host's certificate.
+ * sock.set_verify_mode(ssl::verify_peer);
+ * sock.set_verify_callback(ssl::rfc2818_verification("host.name"));
+ * sock.handshake(ssl_socket::client);
+ *
+ * // ... read and write as normal ...
+ * @endcode
+ */
+class rfc2818_verification
+{
+public:
+  /// The type of the function object's result.
+  typedef bool result_type;
+
+  /// Constructor.
+  explicit rfc2818_verification(const std::string& host)
+    : host_(host)
+  {
+  }
+
+  /// Perform certificate verification.
+  ASIO_DECL bool operator()(bool preverified, verify_context& ctx) const;
+
+private:
+  // Helper function to check a host name against a pattern.
+  ASIO_DECL static bool match_pattern(const char* pattern,
+      std::size_t pattern_length, const char* host);
+
+  // Helper function to check a host name against an IPv4 address
+  // The host name to be checked.
+  std::string host_;
+};
+
+} // namespace ssl
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ssl/impl/rfc2818_verification.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_SSL_RFC2818_VERIFICATION_HPP