Utilities/cmcurl/lib/vtls/vtls.h - third_party/github.com/Kitware/CMake - Git at Google

 #ifndef HEADER_CURL_VTLS_H
 #define HEADER_CURL_VTLS_H
 /***************************************************************************
  *                                  _   _ ____  _
  *  Project                     ___| | | |  _ \| |
  *                             / __| | | | |_) | |
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
  * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
  * are also available at https://curl.se/docs/copyright.html.
  *
  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  * copies of the Software, and permit persons to whom the Software is
  * furnished to do so, under the terms of the COPYING file.
  *
  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  * KIND, either express or implied.
  *
  ***************************************************************************/
 #include "curl_setup.h"

 struct connectdata;
 struct ssl_connect_data;

 #define SSLSUPP_CA_PATH      (1<<0) /* supports CAPATH */
 #define SSLSUPP_CERTINFO     (1<<1) /* supports CURLOPT_CERTINFO */
 #define SSLSUPP_PINNEDPUBKEY (1<<2) /* supports CURLOPT_PINNEDPUBLICKEY */
 #define SSLSUPP_SSL_CTX      (1<<3) /* supports CURLOPT_SSL_CTX */
 #define SSLSUPP_HTTPS_PROXY  (1<<4) /* supports access via HTTPS proxies */
 #define SSLSUPP_TLS13_CIPHERSUITES (1<<5) /* supports TLS 1.3 ciphersuites */
 #define SSLSUPP_CAINFO_BLOB  (1<<6)

 #define ALPN_ACCEPTED "ALPN: server accepted "

 #define VTLS_INFOF_NO_ALPN                                      \
   "ALPN: server did not agree on a protocol. Uses default."
 #define VTLS_INFOF_ALPN_OFFER_1STR              \
   "ALPN: offers %s"
 #define VTLS_INFOF_ALPN_ACCEPTED_1STR           \
   ALPN_ACCEPTED "%s"
 #define VTLS_INFOF_ALPN_ACCEPTED_LEN_1STR       \
   ALPN_ACCEPTED "%.*s"

 struct Curl_ssl {
   /*
    * This *must* be the first entry to allow returning the list of available
    * backends in curl_global_sslset().
    */
   curl_ssl_backend info;
   unsigned int supports; /* bitfield, see above */
   size_t sizeof_ssl_backend_data;

   int (*init)(void);
   void (*cleanup)(void);

   size_t (*version)(char *buffer, size_t size);
   int (*check_cxn)(struct connectdata *cxn);
   int (*shut_down)(struct Curl_easy *data, struct connectdata *conn,
                    int sockindex);
   bool (*data_pending)(const struct connectdata *conn,
                        int connindex);

   /* return 0 if a find random is filled in */
   CURLcode (*random)(struct Curl_easy *data, unsigned char *entropy,
                      size_t length);
   bool (*cert_status_request)(void);

   CURLcode (*connect_blocking)(struct Curl_easy *data,
                                struct connectdata *conn, int sockindex);
   CURLcode (*connect_nonblocking)(struct Curl_easy *data,
                                   struct connectdata *conn, int sockindex,
                                   bool *done);

   /* If the SSL backend wants to read or write on this connection during a
      handshake, set socks[0] to the connection's FIRSTSOCKET, and return
      a bitmap indicating read or write with GETSOCK_WRITESOCK(0) or
      GETSOCK_READSOCK(0). Otherwise return GETSOCK_BLANK.
      Mandatory. */
   int (*getsock)(struct connectdata *conn, curl_socket_t *socks);

   void *(*get_internals)(struct ssl_connect_data *connssl, CURLINFO info);
   void (*close_one)(struct Curl_easy *data, struct connectdata *conn,
                     int sockindex);
   void (*close_all)(struct Curl_easy *data);
   void (*session_free)(void *ptr);

   CURLcode (*set_engine)(struct Curl_easy *data, const char *engine);
   CURLcode (*set_engine_default)(struct Curl_easy *data);
   struct curl_slist *(*engines_list)(struct Curl_easy *data);

   bool (*false_start)(void);
   CURLcode (*sha256sum)(const unsigned char *input, size_t inputlen,
                     unsigned char *sha256sum, size_t sha256sumlen);

   bool (*associate_connection)(struct Curl_easy *data,
                                struct connectdata *conn,
                                int sockindex);
   void (*disassociate_connection)(struct Curl_easy *data, int sockindex);
 };

 #ifdef USE_SSL
 extern const struct Curl_ssl *Curl_ssl;
 #endif

 int Curl_none_init(void);
 void Curl_none_cleanup(void);
 int Curl_none_shutdown(struct Curl_easy *data, struct connectdata *conn,
                        int sockindex);
 int Curl_none_check_cxn(struct connectdata *conn);
 CURLcode Curl_none_random(struct Curl_easy *data, unsigned char *entropy,
                           size_t length);
 void Curl_none_close_all(struct Curl_easy *data);
 void Curl_none_session_free(void *ptr);
 bool Curl_none_data_pending(const struct connectdata *conn, int connindex);
 bool Curl_none_cert_status_request(void);
 CURLcode Curl_none_set_engine(struct Curl_easy *data, const char *engine);
 CURLcode Curl_none_set_engine_default(struct Curl_easy *data);
 struct curl_slist *Curl_none_engines_list(struct Curl_easy *data);
 bool Curl_none_false_start(void);
 bool Curl_ssl_tls13_ciphersuites(void);

 #include "openssl.h"        /* OpenSSL versions */
 #include "gtls.h"           /* GnuTLS versions */
 #include "nssg.h"           /* NSS versions */
 #include "gskit.h"          /* Global Secure ToolKit versions */
 #include "wolfssl.h"        /* wolfSSL versions */
 #include "schannel.h"       /* Schannel SSPI version */
 #include "sectransp.h"      /* SecureTransport (Darwin) version */
 #include "mbedtls.h"        /* mbedTLS versions */
 #include "bearssl.h"        /* BearSSL versions */
 #include "rustls.h"         /* rustls versions */

 #ifndef MAX_PINNED_PUBKEY_SIZE
 #define MAX_PINNED_PUBKEY_SIZE 1048576 /* 1MB */
 #endif

 #ifndef CURL_SHA256_DIGEST_LENGTH
 #define CURL_SHA256_DIGEST_LENGTH 32 /* fixed size */
 #endif

 /* see https://www.iana.org/assignments/tls-extensiontype-values/ */
 #define ALPN_HTTP_1_1_LENGTH 8
 #define ALPN_HTTP_1_1 "http/1.1"
 #define ALPN_H2_LENGTH 2
 #define ALPN_H2 "h2"

 /* set of helper macros for the backends to access the correct fields. For the
    proxy or for the remote host - to properly support HTTPS proxy */
 #ifndef CURL_DISABLE_PROXY
 #define SSL_IS_PROXY()                                                  \
   (CURLPROXY_HTTPS == conn->http_proxy.proxytype &&                     \
    ssl_connection_complete !=                                           \
    conn->proxy_ssl[conn->sock[SECONDARYSOCKET] ==                       \
                    CURL_SOCKET_BAD ? FIRSTSOCKET : SECONDARYSOCKET].state)
 #define SSL_SET_OPTION(var)                                             \
   (SSL_IS_PROXY() ? data->set.proxy_ssl.var : data->set.ssl.var)
 #define SSL_SET_OPTION_LVALUE(var)                                      \
   (*(SSL_IS_PROXY() ? &data->set.proxy_ssl.var : &data->set.ssl.var))
 #define SSL_CONN_CONFIG(var)                                            \
   (SSL_IS_PROXY() ? conn->proxy_ssl_config.var : conn->ssl_config.var)
 #define SSL_HOST_NAME()                                                 \
   (SSL_IS_PROXY() ? conn->http_proxy.host.name : conn->host.name)
 #define SSL_HOST_DISPNAME()                                             \
   (SSL_IS_PROXY() ? conn->http_proxy.host.dispname : conn->host.dispname)
 #define SSL_HOST_PORT()                                                 \
   (SSL_IS_PROXY() ? conn->port : conn->remote_port)
 #define SSL_PINNED_PUB_KEY() (SSL_IS_PROXY()                            \
   ? data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY]                     \
   : data->set.str[STRING_SSL_PINNEDPUBLICKEY])
 #else
 #define SSL_IS_PROXY() FALSE
 #define SSL_SET_OPTION(var) data->set.ssl.var
 #define SSL_SET_OPTION_LVALUE(var) data->set.ssl.var
 #define SSL_CONN_CONFIG(var) conn->ssl_config.var
 #define SSL_HOST_NAME() conn->host.name
 #define SSL_HOST_DISPNAME() conn->host.dispname
 #define SSL_HOST_PORT() conn->remote_port
 #define SSL_PINNED_PUB_KEY()                                            \
   data->set.str[STRING_SSL_PINNEDPUBLICKEY]
 #endif

 char *Curl_ssl_snihost(struct Curl_easy *data, const char *host, size_t *olen);
 bool Curl_ssl_config_matches(struct ssl_primary_config *data,
                              struct ssl_primary_config *needle);
 bool Curl_clone_primary_ssl_config(struct ssl_primary_config *source,
                                    struct ssl_primary_config *dest);
 void Curl_free_primary_ssl_config(struct ssl_primary_config *sslc);
 /* An implementation of the getsock field of Curl_ssl that relies
    on the ssl_connect_state enum. Asks for read or write depending
    on whether conn->state is ssl_connect_2_reading or
    ssl_connect_2_writing. */
 int Curl_ssl_getsock(struct connectdata *conn, curl_socket_t *socks);

 int Curl_ssl_backend(void);

 #ifdef USE_SSL
 int Curl_ssl_init(void);
 void Curl_ssl_cleanup(void);
 CURLcode Curl_ssl_connect(struct Curl_easy *data, struct connectdata *conn,
                           int sockindex);
 CURLcode Curl_ssl_connect_nonblocking(struct Curl_easy *data,
                                       struct connectdata *conn,
                                       bool isproxy,
                                       int sockindex,
                                       bool *done);
 /* tell the SSL stuff to close down all open information regarding
    connections (and thus session ID caching etc) */
 void Curl_ssl_close_all(struct Curl_easy *data);
 void Curl_ssl_close(struct Curl_easy *data, struct connectdata *conn,
                     int sockindex);
 CURLcode Curl_ssl_shutdown(struct Curl_easy *data, struct connectdata *conn,
                            int sockindex);
 CURLcode Curl_ssl_set_engine(struct Curl_easy *data, const char *engine);
 /* Sets engine as default for all SSL operations */
 CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data);
 struct curl_slist *Curl_ssl_engines_list(struct Curl_easy *data);

 /* init the SSL session ID cache */
 CURLcode Curl_ssl_initsessions(struct Curl_easy *, size_t);
 void Curl_ssl_version(char *buffer, size_t size);
 bool Curl_ssl_data_pending(const struct connectdata *conn,
                            int connindex);
 int Curl_ssl_check_cxn(struct connectdata *conn);

 /* Certificate information list handling. */

 void Curl_ssl_free_certinfo(struct Curl_easy *data);
 CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num);
 CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data, int certnum,
                                     const char *label, const char *value,
                                     size_t valuelen);
 CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data, int certnum,
                                 const char *label, const char *value);

 /* Functions to be used by SSL library adaptation functions */

 /* Lock session cache mutex.
  * Call this before calling other Curl_ssl_*session* functions
  * Caller should unlock this mutex as soon as possible, as it may block
  * other SSL connection from making progress.
  * The purpose of explicitly locking SSL session cache data is to allow
  * individual SSL engines to manage session lifetime in their specific way.
  */
 void Curl_ssl_sessionid_lock(struct Curl_easy *data);

 /* Unlock session cache mutex */
 void Curl_ssl_sessionid_unlock(struct Curl_easy *data);

 /* extract a session ID
  * Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
  * Caller must make sure that the ownership of returned sessionid object
  * is properly taken (e.g. its refcount is incremented
  * under sessionid mutex).
  */
 bool Curl_ssl_getsessionid(struct Curl_easy *data,
                            struct connectdata *conn,
                            const bool isProxy,
                            void **ssl_sessionid,
                            size_t *idsize, /* set 0 if unknown */
                            int sockindex);
 /* add a new session ID
  * Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
  * Caller must ensure that it has properly shared ownership of this sessionid
  * object with cache (e.g. incrementing refcount on success)
  */
 CURLcode Curl_ssl_addsessionid(struct Curl_easy *data,
                                struct connectdata *conn,
                                const bool isProxy,
                                void *ssl_sessionid,
                                size_t idsize,
                                int sockindex,
                                bool *added);
 /* Kill a single session ID entry in the cache
  * Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
  * This will call engine-specific curlssl_session_free function, which must
  * take sessionid object ownership from sessionid cache
  * (e.g. decrement refcount).
  */
 void Curl_ssl_kill_session(struct Curl_ssl_session *session);
 /* delete a session from the cache
  * Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
  * This will call engine-specific curlssl_session_free function, which must
  * take sessionid object ownership from sessionid cache
  * (e.g. decrement refcount).
  */
 void Curl_ssl_delsessionid(struct Curl_easy *data, void *ssl_sessionid);

 /* get N random bytes into the buffer */
 CURLcode Curl_ssl_random(struct Curl_easy *data, unsigned char *buffer,
                          size_t length);
 /* Check pinned public key. */
 CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data,
                               const char *pinnedpubkey,
                               const unsigned char *pubkey, size_t pubkeylen);

 bool Curl_ssl_cert_status_request(void);

 bool Curl_ssl_false_start(void);

 void Curl_ssl_associate_conn(struct Curl_easy *data,
                              struct connectdata *conn);
 void Curl_ssl_detach_conn(struct Curl_easy *data,
                           struct connectdata *conn);

 #define SSL_SHUTDOWN_TIMEOUT 10000 /* ms */

 #else /* if not USE_SSL */

 /* When SSL support is not present, just define away these function calls */
 #define Curl_ssl_init() 1
 #define Curl_ssl_cleanup() Curl_nop_stmt
 #define Curl_ssl_connect(x,y,z) CURLE_NOT_BUILT_IN
 #define Curl_ssl_close_all(x) Curl_nop_stmt
 #define Curl_ssl_close(x,y,z) Curl_nop_stmt
 #define Curl_ssl_shutdown(x,y,z) CURLE_NOT_BUILT_IN
 #define Curl_ssl_set_engine(x,y) CURLE_NOT_BUILT_IN
 #define Curl_ssl_set_engine_default(x) CURLE_NOT_BUILT_IN
 #define Curl_ssl_engines_list(x) NULL
 #define Curl_ssl_send(a,b,c,d,e) -1
 #define Curl_ssl_recv(a,b,c,d,e) -1
 #define Curl_ssl_initsessions(x,y) CURLE_OK
 #define Curl_ssl_data_pending(x,y) 0
 #define Curl_ssl_check_cxn(x) 0
 #define Curl_ssl_free_certinfo(x) Curl_nop_stmt
 #define Curl_ssl_connect_nonblocking(x,y,z,w,a) CURLE_NOT_BUILT_IN
 #define Curl_ssl_kill_session(x) Curl_nop_stmt
 #define Curl_ssl_random(x,y,z) ((void)x, CURLE_NOT_BUILT_IN)
 #define Curl_ssl_cert_status_request() FALSE
 #define Curl_ssl_false_start() FALSE
 #define Curl_ssl_tls13_ciphersuites() FALSE
 #define Curl_ssl_associate_conn(a,b) Curl_nop_stmt
 #define Curl_ssl_detach_conn(a,b) Curl_nop_stmt
 #endif

 #endif /* HEADER_CURL_VTLS_H */
	#ifndef HEADER_CURL_VTLS_H
	#define HEADER_CURL_VTLS_H
	/***************************************************************************
	* _ _ ____ _
	* Project ___\| \| \| \| _ \\| \|
	* / __\| \| \| \| \|_) \| \|
	* \| (__\| \|_\| \| _ <\| \|___
	* \___\|\___/\|_\| \_\_____\|
	*
	* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
	*
	* This software is licensed as described in the file COPYING, which
	* you should have received as part of this distribution. The terms
	* are also available at https://curl.se/docs/copyright.html.
	*
	* You may opt to use, copy, modify, merge, publish, distribute and/or sell
	* copies of the Software, and permit persons to whom the Software is
	* furnished to do so, under the terms of the COPYING file.
	*
	* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
	* KIND, either express or implied.
	*
	***************************************************************************/
	#include "curl_setup.h"

	struct connectdata;
	struct ssl_connect_data;

	#define SSLSUPP_CA_PATH (1<<0) /* supports CAPATH */
	#define SSLSUPP_CERTINFO (1<<1) /* supports CURLOPT_CERTINFO */
	#define SSLSUPP_PINNEDPUBKEY (1<<2) /* supports CURLOPT_PINNEDPUBLICKEY */
	#define SSLSUPP_SSL_CTX (1<<3) /* supports CURLOPT_SSL_CTX */
	#define SSLSUPP_HTTPS_PROXY (1<<4) /* supports access via HTTPS proxies */
	#define SSLSUPP_TLS13_CIPHERSUITES (1<<5) /* supports TLS 1.3 ciphersuites */
	#define SSLSUPP_CAINFO_BLOB (1<<6)

	#define ALPN_ACCEPTED "ALPN: server accepted "

	#define VTLS_INFOF_NO_ALPN \
	"ALPN: server did not agree on a protocol. Uses default."
	#define VTLS_INFOF_ALPN_OFFER_1STR \
	"ALPN: offers %s"
	#define VTLS_INFOF_ALPN_ACCEPTED_1STR \
	ALPN_ACCEPTED "%s"
	#define VTLS_INFOF_ALPN_ACCEPTED_LEN_1STR \
	ALPN_ACCEPTED "%.*s"

	struct Curl_ssl {
	/*
	* This must be the first entry to allow returning the list of available
	* backends in curl_global_sslset().
	*/
	curl_ssl_backend info;
	unsigned int supports; /* bitfield, see above */
	size_t sizeof_ssl_backend_data;

	int (*init)(void);
	void (*cleanup)(void);

	size_t (version)(char buffer, size_t size);
	int (check_cxn)(struct connectdata cxn);
	int (shut_down)(struct Curl_easy data, struct connectdata *conn,
	int sockindex);
	bool (data_pending)(const struct connectdata conn,
	int connindex);

	/* return 0 if a find random is filled in */
	CURLcode (random)(struct Curl_easy data, unsigned char *entropy,
	size_t length);
	bool (*cert_status_request)(void);

	CURLcode (connect_blocking)(struct Curl_easy data,
	struct connectdata *conn, int sockindex);
	CURLcode (connect_nonblocking)(struct Curl_easy data,
	struct connectdata *conn, int sockindex,
	bool *done);

	/* If the SSL backend wants to read or write on this connection during a
	handshake, set socks[0] to the connection's FIRSTSOCKET, and return
	a bitmap indicating read or write with GETSOCK_WRITESOCK(0) or
	GETSOCK_READSOCK(0). Otherwise return GETSOCK_BLANK.
	Mandatory. */
	int (getsock)(struct connectdata conn, curl_socket_t *socks);

	void (get_internals)(struct ssl_connect_data *connssl, CURLINFO info);
	void (close_one)(struct Curl_easy data, struct connectdata *conn,
	int sockindex);
	void (close_all)(struct Curl_easy data);
	void (session_free)(void ptr);

	CURLcode (set_engine)(struct Curl_easy data, const char *engine);
	CURLcode (set_engine_default)(struct Curl_easy data);
	struct curl_slist (engines_list)(struct Curl_easy *data);

	bool (*false_start)(void);
	CURLcode (sha256sum)(const unsigned char input, size_t inputlen,
	unsigned char *sha256sum, size_t sha256sumlen);

	bool (associate_connection)(struct Curl_easy data,
	struct connectdata *conn,
	int sockindex);
	void (disassociate_connection)(struct Curl_easy data, int sockindex);
	};

	#ifdef USE_SSL
	extern const struct Curl_ssl *Curl_ssl;
	#endif

	int Curl_none_init(void);
	void Curl_none_cleanup(void);
	int Curl_none_shutdown(struct Curl_easy data, struct connectdata conn,
	int sockindex);
	int Curl_none_check_cxn(struct connectdata *conn);
	CURLcode Curl_none_random(struct Curl_easy data, unsigned char entropy,
	size_t length);
	void Curl_none_close_all(struct Curl_easy *data);
	void Curl_none_session_free(void *ptr);
	bool Curl_none_data_pending(const struct connectdata *conn, int connindex);
	bool Curl_none_cert_status_request(void);
	CURLcode Curl_none_set_engine(struct Curl_easy data, const char engine);
	CURLcode Curl_none_set_engine_default(struct Curl_easy *data);
	struct curl_slist Curl_none_engines_list(struct Curl_easy data);
	bool Curl_none_false_start(void);
	bool Curl_ssl_tls13_ciphersuites(void);

	#include "openssl.h" /* OpenSSL versions */
	#include "gtls.h" /* GnuTLS versions */
	#include "nssg.h" /* NSS versions */
	#include "gskit.h" /* Global Secure ToolKit versions */
	#include "wolfssl.h" /* wolfSSL versions */
	#include "schannel.h" /* Schannel SSPI version */
	#include "sectransp.h" /* SecureTransport (Darwin) version */
	#include "mbedtls.h" /* mbedTLS versions */
	#include "bearssl.h" /* BearSSL versions */
	#include "rustls.h" /* rustls versions */

	#ifndef MAX_PINNED_PUBKEY_SIZE
	#define MAX_PINNED_PUBKEY_SIZE 1048576 /* 1MB */
	#endif

	#ifndef CURL_SHA256_DIGEST_LENGTH
	#define CURL_SHA256_DIGEST_LENGTH 32 /* fixed size */
	#endif

	/* see https://www.iana.org/assignments/tls-extensiontype-values/ */
	#define ALPN_HTTP_1_1_LENGTH 8
	#define ALPN_HTTP_1_1 "http/1.1"
	#define ALPN_H2_LENGTH 2
	#define ALPN_H2 "h2"

	/* set of helper macros for the backends to access the correct fields. For the
	proxy or for the remote host - to properly support HTTPS proxy */
	#ifndef CURL_DISABLE_PROXY
	#define SSL_IS_PROXY() \
	(CURLPROXY_HTTPS == conn->http_proxy.proxytype && \
	ssl_connection_complete != \
	conn->proxy_ssl[conn->sock[SECONDARYSOCKET] == \
	CURL_SOCKET_BAD ? FIRSTSOCKET : SECONDARYSOCKET].state)
	#define SSL_SET_OPTION(var) \
	(SSL_IS_PROXY() ? data->set.proxy_ssl.var : data->set.ssl.var)
	#define SSL_SET_OPTION_LVALUE(var) \
	(*(SSL_IS_PROXY() ? &data->set.proxy_ssl.var : &data->set.ssl.var))
	#define SSL_CONN_CONFIG(var) \
	(SSL_IS_PROXY() ? conn->proxy_ssl_config.var : conn->ssl_config.var)
	#define SSL_HOST_NAME() \
	(SSL_IS_PROXY() ? conn->http_proxy.host.name : conn->host.name)
	#define SSL_HOST_DISPNAME() \
	(SSL_IS_PROXY() ? conn->http_proxy.host.dispname : conn->host.dispname)
	#define SSL_HOST_PORT() \
	(SSL_IS_PROXY() ? conn->port : conn->remote_port)
	#define SSL_PINNED_PUB_KEY() (SSL_IS_PROXY() \
	? data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] \
	: data->set.str[STRING_SSL_PINNEDPUBLICKEY])
	#else
	#define SSL_IS_PROXY() FALSE
	#define SSL_SET_OPTION(var) data->set.ssl.var
	#define SSL_SET_OPTION_LVALUE(var) data->set.ssl.var
	#define SSL_CONN_CONFIG(var) conn->ssl_config.var
	#define SSL_HOST_NAME() conn->host.name
	#define SSL_HOST_DISPNAME() conn->host.dispname
	#define SSL_HOST_PORT() conn->remote_port
	#define SSL_PINNED_PUB_KEY() \
	data->set.str[STRING_SSL_PINNEDPUBLICKEY]
	#endif

	char Curl_ssl_snihost(struct Curl_easy data, const char host, size_t olen);
	bool Curl_ssl_config_matches(struct ssl_primary_config *data,
	struct ssl_primary_config *needle);
	bool Curl_clone_primary_ssl_config(struct ssl_primary_config *source,
	struct ssl_primary_config *dest);
	void Curl_free_primary_ssl_config(struct ssl_primary_config *sslc);
	/* An implementation of the getsock field of Curl_ssl that relies
	on the ssl_connect_state enum. Asks for read or write depending
	on whether conn->state is ssl_connect_2_reading or
	ssl_connect_2_writing. */
	int Curl_ssl_getsock(struct connectdata conn, curl_socket_t socks);

	int Curl_ssl_backend(void);

	#ifdef USE_SSL
	int Curl_ssl_init(void);
	void Curl_ssl_cleanup(void);
	CURLcode Curl_ssl_connect(struct Curl_easy data, struct connectdata conn,
	int sockindex);
	CURLcode Curl_ssl_connect_nonblocking(struct Curl_easy *data,
	struct connectdata *conn,
	bool isproxy,
	int sockindex,
	bool *done);
	/* tell the SSL stuff to close down all open information regarding
	connections (and thus session ID caching etc) */
	void Curl_ssl_close_all(struct Curl_easy *data);
	void Curl_ssl_close(struct Curl_easy data, struct connectdata conn,
	int sockindex);
	CURLcode Curl_ssl_shutdown(struct Curl_easy data, struct connectdata conn,
	int sockindex);
	CURLcode Curl_ssl_set_engine(struct Curl_easy data, const char engine);
	/* Sets engine as default for all SSL operations */
	CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data);
	struct curl_slist Curl_ssl_engines_list(struct Curl_easy data);

	/* init the SSL session ID cache */
	CURLcode Curl_ssl_initsessions(struct Curl_easy *, size_t);
	void Curl_ssl_version(char *buffer, size_t size);
	bool Curl_ssl_data_pending(const struct connectdata *conn,
	int connindex);
	int Curl_ssl_check_cxn(struct connectdata *conn);

	/* Certificate information list handling. */

	void Curl_ssl_free_certinfo(struct Curl_easy *data);
	CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num);
	CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data, int certnum,
	const char label, const char value,
	size_t valuelen);
	CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data, int certnum,
	const char label, const char value);

	/* Functions to be used by SSL library adaptation functions */

	/* Lock session cache mutex.
	* Call this before calling other Curl_ssl_session functions
	* Caller should unlock this mutex as soon as possible, as it may block
	* other SSL connection from making progress.
	* The purpose of explicitly locking SSL session cache data is to allow
	* individual SSL engines to manage session lifetime in their specific way.
	*/
	void Curl_ssl_sessionid_lock(struct Curl_easy *data);

	/* Unlock session cache mutex */
	void Curl_ssl_sessionid_unlock(struct Curl_easy *data);

	/* extract a session ID
	* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
	* Caller must make sure that the ownership of returned sessionid object
	* is properly taken (e.g. its refcount is incremented
	* under sessionid mutex).
	*/
	bool Curl_ssl_getsessionid(struct Curl_easy *data,
	struct connectdata *conn,
	const bool isProxy,
	void **ssl_sessionid,
	size_t idsize, / set 0 if unknown */
	int sockindex);
	/* add a new session ID
	* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
	* Caller must ensure that it has properly shared ownership of this sessionid
	* object with cache (e.g. incrementing refcount on success)
	*/
	CURLcode Curl_ssl_addsessionid(struct Curl_easy *data,
	struct connectdata *conn,
	const bool isProxy,
	void *ssl_sessionid,
	size_t idsize,
	int sockindex,
	bool *added);
	/* Kill a single session ID entry in the cache
	* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
	* This will call engine-specific curlssl_session_free function, which must
	* take sessionid object ownership from sessionid cache
	* (e.g. decrement refcount).
	*/
	void Curl_ssl_kill_session(struct Curl_ssl_session *session);
	/* delete a session from the cache
	* Sessionid mutex must be locked (see Curl_ssl_sessionid_lock).
	* This will call engine-specific curlssl_session_free function, which must
	* take sessionid object ownership from sessionid cache
	* (e.g. decrement refcount).
	*/
	void Curl_ssl_delsessionid(struct Curl_easy data, void ssl_sessionid);

	/* get N random bytes into the buffer */
	CURLcode Curl_ssl_random(struct Curl_easy data, unsigned char buffer,
	size_t length);
	/* Check pinned public key. */
	CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data,
	const char *pinnedpubkey,
	const unsigned char *pubkey, size_t pubkeylen);

	bool Curl_ssl_cert_status_request(void);

	bool Curl_ssl_false_start(void);

	void Curl_ssl_associate_conn(struct Curl_easy *data,
	struct connectdata *conn);
	void Curl_ssl_detach_conn(struct Curl_easy *data,
	struct connectdata *conn);

	#define SSL_SHUTDOWN_TIMEOUT 10000 /* ms */

	#else /* if not USE_SSL */

	/* When SSL support is not present, just define away these function calls */
	#define Curl_ssl_init() 1
	#define Curl_ssl_cleanup() Curl_nop_stmt
	#define Curl_ssl_connect(x,y,z) CURLE_NOT_BUILT_IN
	#define Curl_ssl_close_all(x) Curl_nop_stmt
	#define Curl_ssl_close(x,y,z) Curl_nop_stmt
	#define Curl_ssl_shutdown(x,y,z) CURLE_NOT_BUILT_IN
	#define Curl_ssl_set_engine(x,y) CURLE_NOT_BUILT_IN
	#define Curl_ssl_set_engine_default(x) CURLE_NOT_BUILT_IN
	#define Curl_ssl_engines_list(x) NULL
	#define Curl_ssl_send(a,b,c,d,e) -1
	#define Curl_ssl_recv(a,b,c,d,e) -1
	#define Curl_ssl_initsessions(x,y) CURLE_OK
	#define Curl_ssl_data_pending(x,y) 0
	#define Curl_ssl_check_cxn(x) 0
	#define Curl_ssl_free_certinfo(x) Curl_nop_stmt
	#define Curl_ssl_connect_nonblocking(x,y,z,w,a) CURLE_NOT_BUILT_IN
	#define Curl_ssl_kill_session(x) Curl_nop_stmt
	#define Curl_ssl_random(x,y,z) ((void)x, CURLE_NOT_BUILT_IN)
	#define Curl_ssl_cert_status_request() FALSE
	#define Curl_ssl_false_start() FALSE
	#define Curl_ssl_tls13_ciphersuites() FALSE
	#define Curl_ssl_associate_conn(a,b) Curl_nop_stmt
	#define Curl_ssl_detach_conn(a,b) Curl_nop_stmt
	#endif

	#endif /* HEADER_CURL_VTLS_H */