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 //
 // ssl/context.hpp
 // ~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2023 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 BOOST_ASIO_SSL_CONTEXT_HPP
 #define BOOST_ASIO_SSL_CONTEXT_HPP
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
 
 #include <string>
 #include <boost/asio/buffer.hpp>
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/ssl/context_base.hpp>
 #include <boost/asio/ssl/detail/openssl_types.hpp>
 #include <boost/asio/ssl/detail/openssl_init.hpp>
 #include <boost/asio/ssl/detail/password_callback.hpp>
 #include <boost/asio/ssl/detail/verify_callback.hpp>
 #include <boost/asio/ssl/verify_mode.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 namespace ssl {
 
 class context
   : public context_base,
     private noncopyable
 {
 public:
   /// The native handle type of the SSL context.
   typedef SSL_CTX* native_handle_type;
 
   /// Constructor.
   BOOST_ASIO_DECL explicit context(method m);
 
   /// Construct to take ownership of a native handle.
   BOOST_ASIO_DECL explicit context(native_handle_type native_handle);
 
   /// Move-construct a context from another.
   /**
    * This constructor moves an SSL context from one object to another.
    *
    * @param other The other context object from which the move will occur.
    *
    * @note Following the move, the following operations only are valid for the
    * moved-from object:
    * @li Destruction.
    * @li As a target for move-assignment.
    */
   BOOST_ASIO_DECL context(context&& other);
 
   /// Move-assign a context from another.
   /**
    * This assignment operator moves an SSL context from one object to another.
    *
    * @param other The other context object from which the move will occur.
    *
    * @note Following the move, the following operations only are valid for the
    * moved-from object:
    * @li Destruction.
    * @li As a target for move-assignment.
    */
   BOOST_ASIO_DECL context& operator=(context&& other);
 
   /// Destructor.
   BOOST_ASIO_DECL ~context();
 
   /// Get the underlying implementation in the native type.
   /**
    * This function may be used to obtain the underlying implementation of the
    * context. This is intended to allow access to context functionality that is
    * not otherwise provided.
    */
   BOOST_ASIO_DECL native_handle_type native_handle();
 
   /// Clear options on the context.
   /**
    * This function may be used to configure the SSL options used by the context.
    *
    * @param o A bitmask of options. The available option values are defined in
    * the context_base class. The specified options, if currently enabled on the
    * context, are cleared.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_clear_options.
    */
   BOOST_ASIO_DECL void clear_options(options o);
 
   /// Clear options on the context.
   /**
    * This function may be used to configure the SSL options used by the context.
    *
    * @param o A bitmask of options. The available option values are defined in
    * the context_base class. The specified options, if currently enabled on the
    * context, are cleared.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_clear_options.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID clear_options(options o,
       boost::system::error_code& ec);
 
   /// Set options on the context.
   /**
    * This function may be used to configure the SSL options used by the context.
    *
    * @param o A bitmask of options. The available option values are defined in
    * the context_base class. The options are bitwise-ored with any existing
    * value for the options.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_options.
    */
   BOOST_ASIO_DECL void set_options(options o);
 
   /// Set options on the context.
   /**
    * This function may be used to configure the SSL options used by the context.
    *
    * @param o A bitmask of options. The available option values are defined in
    * the context_base class. The options are bitwise-ored with any existing
    * value for the options.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_options.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID set_options(options o,
       boost::system::error_code& ec);
 
   /// Set the peer verification mode.
   /**
    * This function may be used to configure the peer verification mode used by
    * the context.
    *
    * @param v A bitmask of peer verification modes. See @ref verify_mode for
    * available values.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_verify.
    */
   BOOST_ASIO_DECL void set_verify_mode(verify_mode v);
 
   /// Set the peer verification mode.
   /**
    * This function may be used to configure the peer verification mode used by
    * the context.
    *
    * @param v A bitmask of peer verification modes. See @ref verify_mode for
    * available values.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_verify.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID set_verify_mode(
       verify_mode v, boost::system::error_code& ec);
 
   /// Set the peer verification depth.
   /**
    * This function may be used to configure the maximum verification depth
    * allowed by the context.
    *
    * @param depth Maximum depth for the certificate chain verification that
    * shall be allowed.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_verify_depth.
    */
   BOOST_ASIO_DECL void set_verify_depth(int depth);
 
   /// Set the peer verification depth.
   /**
    * This function may be used to configure the maximum verification depth
    * allowed by the context.
    *
    * @param depth Maximum depth for the certificate chain verification that
    * shall be allowed.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_verify_depth.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID set_verify_depth(
       int depth, boost::system::error_code& ec);
 
   /// Set the callback used to verify peer certificates.
   /**
    * This function is used to specify a callback function that will be called
    * by the implementation when it needs to verify a peer certificate.
    *
    * @param callback The function object to be used for verifying a certificate.
    * The function signature of the handler must be:
    * @code bool verify_callback(
    *   bool preverified, // True if the certificate passed pre-verification.
    *   verify_context& ctx // The peer certificate and other context.
    * ); @endcode
    * The return value of the callback is true if the certificate has passed
    * verification, false otherwise.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_verify.
    */
   template <typename VerifyCallback>
   void set_verify_callback(VerifyCallback callback);
 
   /// Set the callback used to verify peer certificates.
   /**
    * This function is used to specify a callback function that will be called
    * by the implementation when it needs to verify a peer certificate.
    *
    * @param callback The function object to be used for verifying a certificate.
    * The function signature of the handler must be:
    * @code bool verify_callback(
    *   bool preverified, // True if the certificate passed pre-verification.
    *   verify_context& ctx // The peer certificate and other context.
    * ); @endcode
    * The return value of the callback is true if the certificate has passed
    * verification, false otherwise.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_verify.
    */
   template <typename VerifyCallback>
   BOOST_ASIO_SYNC_OP_VOID set_verify_callback(VerifyCallback callback,
       boost::system::error_code& ec);
 
   /// Load a certification authority file for performing verification.
   /**
    * This function is used to load one or more trusted certification authorities
    * from a file.
    *
    * @param filename The name of a file containing certification authority
    * certificates in PEM format.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_load_verify_locations.
    */
   BOOST_ASIO_DECL void load_verify_file(const std::string& filename);
 
   /// Load a certification authority file for performing verification.
   /**
    * This function is used to load the certificates for one or more trusted
    * certification authorities from a file.
    *
    * @param filename The name of a file containing certification authority
    * certificates in PEM format.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_load_verify_locations.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID load_verify_file(
       const std::string& filename, boost::system::error_code& ec);
 
   /// Add certification authority for performing verification.
   /**
    * This function is used to add one trusted certification authority
    * from a memory buffer.
    *
    * @param ca The buffer containing the certification authority certificate.
    * The certificate must use the PEM format.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_get_cert_store and @c X509_STORE_add_cert.
    */
   BOOST_ASIO_DECL void add_certificate_authority(const const_buffer& ca);
 
   /// Add certification authority for performing verification.
   /**
    * This function is used to add one trusted certification authority
    * from a memory buffer.
    *
    * @param ca The buffer containing the certification authority certificate.
    * The certificate must use the PEM format.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_get_cert_store and @c X509_STORE_add_cert.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID add_certificate_authority(
       const const_buffer& ca, boost::system::error_code& ec);
 
   /// Configures the context to use the default directories for finding
   /// certification authority certificates.
   /**
    * This function specifies that the context should use the default,
    * system-dependent directories for locating certification authority
    * certificates.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_default_verify_paths.
    */
   BOOST_ASIO_DECL void set_default_verify_paths();
 
   /// Configures the context to use the default directories for finding
   /// certification authority certificates.
   /**
    * This function specifies that the context should use the default,
    * system-dependent directories for locating certification authority
    * certificates.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_default_verify_paths.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID set_default_verify_paths(
       boost::system::error_code& ec);
 
   /// Add a directory containing certificate authority files to be used for
   /// performing verification.
   /**
    * This function is used to specify the name of a directory containing
    * certification authority certificates. Each file in the directory must
    * contain a single certificate. The files must be named using the subject
    * name's hash and an extension of ".0".
    *
    * @param path The name of a directory containing the certificates.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_load_verify_locations.
    */
   BOOST_ASIO_DECL void add_verify_path(const std::string& path);
 
   /// Add a directory containing certificate authority files to be used for
   /// performing verification.
   /**
    * This function is used to specify the name of a directory containing
    * certification authority certificates. Each file in the directory must
    * contain a single certificate. The files must be named using the subject
    * name's hash and an extension of ".0".
    *
    * @param path The name of a directory containing the certificates.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_load_verify_locations.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID add_verify_path(
       const std::string& path, boost::system::error_code& ec);
 
   /// Use a certificate from a memory buffer.
   /**
    * This function is used to load a certificate into the context from a buffer.
    *
    * @param certificate The buffer containing the certificate.
    *
    * @param format The certificate format (ASN.1 or PEM).
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_certificate or SSL_CTX_use_certificate_ASN1.
    */
   BOOST_ASIO_DECL void use_certificate(
       const const_buffer& certificate, file_format format);
 
   /// Use a certificate from a memory buffer.
   /**
    * This function is used to load a certificate into the context from a buffer.
    *
    * @param certificate The buffer containing the certificate.
    *
    * @param format The certificate format (ASN.1 or PEM).
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_certificate or SSL_CTX_use_certificate_ASN1.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_certificate(
       const const_buffer& certificate, file_format format,
       boost::system::error_code& ec);
 
   /// Use a certificate from a file.
   /**
    * This function is used to load a certificate into the context from a file.
    *
    * @param filename The name of the file containing the certificate.
    *
    * @param format The file format (ASN.1 or PEM).
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_certificate_file.
    */
   BOOST_ASIO_DECL void use_certificate_file(
       const std::string& filename, file_format format);
 
   /// Use a certificate from a file.
   /**
    * This function is used to load a certificate into the context from a file.
    *
    * @param filename The name of the file containing the certificate.
    *
    * @param format The file format (ASN.1 or PEM).
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_certificate_file.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_certificate_file(
       const std::string& filename, file_format format,
       boost::system::error_code& ec);
 
   /// Use a certificate chain from a memory buffer.
   /**
    * This function is used to load a certificate chain into the context from a
    * buffer.
    *
    * @param chain The buffer containing the certificate chain. The certificate
    * chain must use the PEM format.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_certificate and SSL_CTX_add_extra_chain_cert.
    */
   BOOST_ASIO_DECL void use_certificate_chain(const const_buffer& chain);
 
   /// Use a certificate chain from a memory buffer.
   /**
    * This function is used to load a certificate chain into the context from a
    * buffer.
    *
    * @param chain The buffer containing the certificate chain. The certificate
    * chain must use the PEM format.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_certificate and SSL_CTX_add_extra_chain_cert.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_certificate_chain(
       const const_buffer& chain, boost::system::error_code& ec);
 
   /// Use a certificate chain from a file.
   /**
    * This function is used to load a certificate chain into the context from a
    * file.
    *
    * @param filename The name of the file containing the certificate. The file
    * must use the PEM format.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_certificate_chain_file.
    */
   BOOST_ASIO_DECL void use_certificate_chain_file(const std::string& filename);
 
   /// Use a certificate chain from a file.
   /**
    * This function is used to load a certificate chain into the context from a
    * file.
    *
    * @param filename The name of the file containing the certificate. The file
    * must use the PEM format.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_certificate_chain_file.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_certificate_chain_file(
       const std::string& filename, boost::system::error_code& ec);
 
   /// Use a private key from a memory buffer.
   /**
    * This function is used to load a private key into the context from a buffer.
    *
    * @param private_key The buffer containing the private key.
    *
    * @param format The private key format (ASN.1 or PEM).
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_PrivateKey or SSL_CTX_use_PrivateKey_ASN1.
    */
   BOOST_ASIO_DECL void use_private_key(
       const const_buffer& private_key, file_format format);
 
   /// Use a private key from a memory buffer.
   /**
    * This function is used to load a private key into the context from a buffer.
    *
    * @param private_key The buffer containing the private key.
    *
    * @param format The private key format (ASN.1 or PEM).
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_PrivateKey or SSL_CTX_use_PrivateKey_ASN1.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_private_key(
       const const_buffer& private_key, file_format format,
       boost::system::error_code& ec);
 
   /// Use a private key from a file.
   /**
    * This function is used to load a private key into the context from a file.
    *
    * @param filename The name of the file containing the private key.
    *
    * @param format The file format (ASN.1 or PEM).
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_PrivateKey_file.
    */
   BOOST_ASIO_DECL void use_private_key_file(
       const std::string& filename, file_format format);
 
   /// Use a private key from a file.
   /**
    * This function is used to load a private key into the context from a file.
    *
    * @param filename The name of the file containing the private key.
    *
    * @param format The file format (ASN.1 or PEM).
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_PrivateKey_file.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_private_key_file(
       const std::string& filename, file_format format,
       boost::system::error_code& ec);
 
   /// Use an RSA private key from a memory buffer.
   /**
    * This function is used to load an RSA private key into the context from a
    * buffer.
    *
    * @param private_key The buffer containing the RSA private key.
    *
    * @param format The private key format (ASN.1 or PEM).
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_RSAPrivateKey or SSL_CTX_use_RSAPrivateKey_ASN1.
    */
   BOOST_ASIO_DECL void use_rsa_private_key(
       const const_buffer& private_key, file_format format);
 
   /// Use an RSA private key from a memory buffer.
   /**
    * This function is used to load an RSA private key into the context from a
    * buffer.
    *
    * @param private_key The buffer containing the RSA private key.
    *
    * @param format The private key format (ASN.1 or PEM).
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_RSAPrivateKey or SSL_CTX_use_RSAPrivateKey_ASN1.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_rsa_private_key(
       const const_buffer& private_key, file_format format,
       boost::system::error_code& ec);
 
   /// Use an RSA private key from a file.
   /**
    * This function is used to load an RSA private key into the context from a
    * file.
    *
    * @param filename The name of the file containing the RSA private key.
    *
    * @param format The file format (ASN.1 or PEM).
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_use_RSAPrivateKey_file.
    */
   BOOST_ASIO_DECL void use_rsa_private_key_file(
       const std::string& filename, file_format format);
 
   /// Use an RSA private key from a file.
   /**
    * This function is used to load an RSA private key into the context from a
    * file.
    *
    * @param filename The name of the file containing the RSA private key.
    *
    * @param format The file format (ASN.1 or PEM).
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_use_RSAPrivateKey_file.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_rsa_private_key_file(
       const std::string& filename, file_format format,
       boost::system::error_code& ec);
 
   /// Use the specified memory buffer to obtain the temporary Diffie-Hellman
   /// parameters.
   /**
    * This function is used to load Diffie-Hellman parameters into the context
    * from a buffer.
    *
    * @param dh The memory buffer containing the Diffie-Hellman parameters. The
    * buffer must use the PEM format.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_tmp_dh.
    */
   BOOST_ASIO_DECL void use_tmp_dh(const const_buffer& dh);
 
   /// Use the specified memory buffer to obtain the temporary Diffie-Hellman
   /// parameters.
   /**
    * This function is used to load Diffie-Hellman parameters into the context
    * from a buffer.
    *
    * @param dh The memory buffer containing the Diffie-Hellman parameters. The
    * buffer must use the PEM format.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_tmp_dh.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_tmp_dh(
       const const_buffer& dh, boost::system::error_code& ec);
 
   /// Use the specified file to obtain the temporary Diffie-Hellman parameters.
   /**
    * This function is used to load Diffie-Hellman parameters into the context
    * from a file.
    *
    * @param filename The name of the file containing the Diffie-Hellman
    * parameters. The file must use the PEM format.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_tmp_dh.
    */
   BOOST_ASIO_DECL void use_tmp_dh_file(const std::string& filename);
 
   /// Use the specified file to obtain the temporary Diffie-Hellman parameters.
   /**
    * This function is used to load Diffie-Hellman parameters into the context
    * from a file.
    *
    * @param filename The name of the file containing the Diffie-Hellman
    * parameters. The file must use the PEM format.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_tmp_dh.
    */
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID use_tmp_dh_file(
       const std::string& filename, boost::system::error_code& ec);
 
   /// Set the password callback.
   /**
    * This function is used to specify a callback function to obtain password
    * information about an encrypted key in PEM format.
    *
    * @param callback The function object to be used for obtaining the password.
    * The function signature of the handler must be:
    * @code std::string password_callback(
    *   std::size_t max_length,  // The maximum size for a password.
    *   password_purpose purpose // Whether password is for reading or writing.
    * ); @endcode
    * The return value of the callback is a string containing the password.
    *
    * @throws boost::system::system_error Thrown on failure.
    *
    * @note Calls @c SSL_CTX_set_default_passwd_cb.
    */
   template <typename PasswordCallback>
   void set_password_callback(PasswordCallback callback);
 
   /// Set the password callback.
   /**
    * This function is used to specify a callback function to obtain password
    * information about an encrypted key in PEM format.
    *
    * @param callback The function object to be used for obtaining the password.
    * The function signature of the handler must be:
    * @code std::string password_callback(
    *   std::size_t max_length,  // The maximum size for a password.
    *   password_purpose purpose // Whether password is for reading or writing.
    * ); @endcode
    * The return value of the callback is a string containing the password.
    *
    * @param ec Set to indicate what error occurred, if any.
    *
    * @note Calls @c SSL_CTX_set_default_passwd_cb.
    */
   template <typename PasswordCallback>
   BOOST_ASIO_SYNC_OP_VOID set_password_callback(PasswordCallback callback,
       boost::system::error_code& ec);
 
 private:
   struct bio_cleanup;
   struct x509_cleanup;
   struct evp_pkey_cleanup;
   struct rsa_cleanup;
   struct dh_cleanup;
 
   // Helper function used to set a peer certificate verification callback.
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID do_set_verify_callback(
       detail::verify_callback_base* callback, boost::system::error_code& ec);
 
   // Callback used when the SSL implementation wants to verify a certificate.
   BOOST_ASIO_DECL static int verify_callback_function(
       int preverified, X509_STORE_CTX* ctx);
 
   // Helper function used to set a password callback.
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID do_set_password_callback(
       detail::password_callback_base* callback, boost::system::error_code& ec);
 
   // Callback used when the SSL implementation wants a password.
   BOOST_ASIO_DECL static int password_callback_function(
       char* buf, int size, int purpose, void* data);
 
   // Helper function to set the temporary Diffie-Hellman parameters from a BIO.
   BOOST_ASIO_DECL BOOST_ASIO_SYNC_OP_VOID do_use_tmp_dh(
       BIO* bio, boost::system::error_code& ec);
 
   // Helper function to make a BIO from a memory buffer.
   BOOST_ASIO_DECL BIO* make_buffer_bio(const const_buffer& b);
 
   // Translate an SSL error into an error code.
   BOOST_ASIO_DECL static boost::system::error_code translate_error(long error);
 
   // The underlying native implementation.
   native_handle_type handle_;
 
   // Ensure openssl is initialised.
   boost::asio::ssl::detail::openssl_init<> init_;
 };
 
 } // namespace ssl
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #include <boost/asio/ssl/impl/context.hpp>
 #if defined(BOOST_ASIO_HEADER_ONLY)
 # include <boost/asio/ssl/impl/context.ipp>
 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 
 #endif // BOOST_ASIO_SSL_CONTEXT_HPP

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