text: /*
   * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   * Copyright 2005 Nokia. All rights reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #ifndef HEADER_SSL_H
  # define HEADER_SSL_H
  
  # include <openssl/e_os2.h>
  # include <openssl/opensslconf.h>
  # include <openssl/comp.h>
  # include <openssl/bio.h>
  # if !OPENSSL_API_1_1_0
  #  include <openssl/x509.h>
  #  include <openssl/crypto.h>
  #  include <openssl/buffer.h>
  # endif
  # include <openssl/lhash.h>
  # include <openssl/pem.h>
  # include <openssl/hmac.h>
  # include <openssl/async.h>
  
  # include <openssl/safestack.h>
  # include <openssl/symhacks.h>
  # include <openssl/ct.h>
  # include <openssl/sslerr.h>
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /* OpenSSL version number for ASN.1 encoding of the session information */
  /*-
   * Version 0 - initial version
   * Version 1 - added the optional peer certificate
   */
  # define SSL_SESSION_ASN1_VERSION 0x0001
  
  # define SSL_MAX_SSL_SESSION_ID_LENGTH           32
  # define SSL_MAX_SID_CTX_LENGTH                  32
  
  # define SSL_MIN_RSA_MODULUS_LENGTH_IN_BYTES     (512/8)
  # define SSL_MAX_KEY_ARG_LENGTH                  8
  # define SSL_MAX_MASTER_KEY_LENGTH               48
  
  /* The maximum number of encrypt/decrypt pipelines we can support */
  # define SSL_MAX_PIPELINES  32
  
  /* text strings for the ciphers */
  
  /* These are used to specify which ciphers to use and not to use */
  
  # define SSL_TXT_LOW             "LOW"
  # define SSL_TXT_MEDIUM          "MEDIUM"
  # define SSL_TXT_HIGH            "HIGH"
  # define SSL_TXT_FIPS            "FIPS"
  
  # define SSL_TXT_aNULL           "aNULL"
  # define SSL_TXT_eNULL           "eNULL"
  # define SSL_TXT_NULL            "NULL"
  
  # define SSL_TXT_kRSA            "kRSA"
  # define SSL_TXT_kDHr            "kDHr"/* this cipher class has been removed */
  # define SSL_TXT_kDHd            "kDHd"/* this cipher class has been removed */
  # define SSL_TXT_kDH             "kDH"/* this cipher class has been removed */
  # define SSL_TXT_kEDH            "kEDH"/* alias for kDHE */
  # define SSL_TXT_kDHE            "kDHE"
  # define SSL_TXT_kECDHr          "kECDHr"/* this cipher class has been removed */
  # define SSL_TXT_kECDHe          "kECDHe"/* this cipher class has been removed */
  # define SSL_TXT_kECDH           "kECDH"/* this cipher class has been removed */
  # define SSL_TXT_kEECDH          "kEECDH"/* alias for kECDHE */
  # define SSL_TXT_kECDHE          "kECDHE"
  # define SSL_TXT_kPSK            "kPSK"
  # define SSL_TXT_kRSAPSK         "kRSAPSK"
  # define SSL_TXT_kECDHEPSK       "kECDHEPSK"
  # define SSL_TXT_kDHEPSK         "kDHEPSK"
  # define SSL_TXT_kGOST           "kGOST"
  # define SSL_TXT_kSRP            "kSRP"
  
  # define SSL_TXT_aRSA            "aRSA"
  # define SSL_TXT_aDSS            "aDSS"
  # define SSL_TXT_aDH             "aDH"/* this cipher class has been removed */
  # define SSL_TXT_aECDH           "aECDH"/* this cipher class has been removed */
  # define SSL_TXT_aECDSA          "aECDSA"
  # define SSL_TXT_aPSK            "aPSK"
  # define SSL_TXT_aGOST94         "aGOST94"
  # define SSL_TXT_aGOST01         "aGOST01"
  # define SSL_TXT_aGOST12         "aGOST12"
  # define SSL_TXT_aGOST           "aGOST"
  # define SSL_TXT_aSRP            "aSRP"
  
  # define SSL_TXT_DSS             "DSS"
  # define SSL_TXT_DH              "DH"
  # define SSL_TXT_DHE             "DHE"/* same as "kDHE:-ADH" */
  # define SSL_TXT_EDH             "EDH"/* alias for DHE */
  # define SSL_TXT_ADH             "ADH"
  # define SSL_TXT_RSA             "RSA"
  # define SSL_TXT_ECDH            "ECDH"
  # define SSL_TXT_EECDH           "EECDH"/* alias for ECDHE" */
  # define SSL_TXT_ECDHE           "ECDHE"/* same as "kECDHE:-AECDH" */
  # define SSL_TXT_AECDH           "AECDH"
  # define SSL_TXT_ECDSA           "ECDSA"
  # define SSL_TXT_PSK             "PSK"
  # define SSL_TXT_SRP             "SRP"
  
  # define SSL_TXT_DES             "DES"
  # define SSL_TXT_3DES            "3DES"
  # define SSL_TXT_RC4             "RC4"
  # define SSL_TXT_RC2             "RC2"
  # define SSL_TXT_IDEA            "IDEA"
  # define SSL_TXT_SEED            "SEED"
  # define SSL_TXT_AES128          "AES128"
  # define SSL_TXT_AES256          "AES256"
  # define SSL_TXT_AES             "AES"
  # define SSL_TXT_AES_GCM         "AESGCM"
  # define SSL_TXT_AES_CCM         "AESCCM"
  # define SSL_TXT_AES_CCM_8       "AESCCM8"
  # define SSL_TXT_CAMELLIA128     "CAMELLIA128"
  # define SSL_TXT_CAMELLIA256     "CAMELLIA256"
  # define SSL_TXT_CAMELLIA        "CAMELLIA"
  # define SSL_TXT_CHACHA20        "CHACHA20"
  # define SSL_TXT_GOST            "GOST89"
  # define SSL_TXT_ARIA            "ARIA"
  # define SSL_TXT_ARIA_GCM        "ARIAGCM"
  # define SSL_TXT_ARIA128         "ARIA128"
  # define SSL_TXT_ARIA256         "ARIA256"
  
  # define SSL_TXT_MD5             "MD5"
  # define SSL_TXT_SHA1            "SHA1"
  # define SSL_TXT_SHA             "SHA"/* same as "SHA1" */
  # define SSL_TXT_GOST94          "GOST94"
  # define SSL_TXT_GOST89MAC       "GOST89MAC"
  # define SSL_TXT_GOST12          "GOST12"
  # define SSL_TXT_GOST89MAC12     "GOST89MAC12"
  # define SSL_TXT_SHA256          "SHA256"
  # define SSL_TXT_SHA384          "SHA384"
  
  # define SSL_TXT_SSLV3           "SSLv3"
  # define SSL_TXT_TLSV1           "TLSv1"
  # define SSL_TXT_TLSV1_1         "TLSv1.1"
  # define SSL_TXT_TLSV1_2         "TLSv1.2"
  
  # define SSL_TXT_ALL             "ALL"
  
  /*-
   * COMPLEMENTOF* definitions. These identifiers are used to (de-select)
   * ciphers normally not being used.
   * Example: "RC4" will activate all ciphers using RC4 including ciphers
   * without authentication, which would normally disabled by DEFAULT (due
   * the "!ADH" being part of default). Therefore "RC4:!COMPLEMENTOFDEFAULT"
   * will make sure that it is also disabled in the specific selection.
   * COMPLEMENTOF* identifiers are portable between version, as adjustments
   * to the default cipher setup will also be included here.
   *
   * COMPLEMENTOFDEFAULT does not experience the same special treatment that
   * DEFAULT gets, as only selection is being done and no sorting as needed
   * for DEFAULT.
   */
  # define SSL_TXT_CMPALL          "COMPLEMENTOFALL"
  # define SSL_TXT_CMPDEF          "COMPLEMENTOFDEFAULT"
  
  /*
   * The following cipher list is used by default. It also is substituted when
   * an application-defined cipher list string starts with 'DEFAULT'.
   * This applies to ciphersuites for TLSv1.2 and below.
   */
  # define SSL_DEFAULT_CIPHER_LIST "ALL:!COMPLEMENTOFDEFAULT:!eNULL"
  /* This is the default set of TLSv1.3 ciphersuites */
  # if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
  #  define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
                                     "TLS_CHACHA20_POLY1305_SHA256:" \
                                     "TLS_AES_128_GCM_SHA256"
  # else
  #  define TLS_DEFAULT_CIPHERSUITES "TLS_AES_256_GCM_SHA384:" \
                                     "TLS_AES_128_GCM_SHA256"
  #endif
  /*
   * As of OpenSSL 1.0.0, ssl_create_cipher_list() in ssl/ssl_ciph.c always
   * starts with a reasonable order, and all we have to do for DEFAULT is
   * throwing out anonymous and unencrypted ciphersuites! (The latter are not
   * actually enabled by ALL, but "ALL:RSA" would enable some of them.)
   */
  
  /* Used in SSL_set_shutdown()/SSL_get_shutdown(); */
  # define SSL_SENT_SHUTDOWN       1
  # define SSL_RECEIVED_SHUTDOWN   2
  
  #ifdef __cplusplus
  }
  #endif
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  # define SSL_FILETYPE_ASN1       X509_FILETYPE_ASN1
  # define SSL_FILETYPE_PEM        X509_FILETYPE_PEM
  
  /*
   * This is needed to stop compilers complaining about the 'struct ssl_st *'
   * function parameters used to prototype callbacks in SSL_CTX.
   */
  typedef struct ssl_st *ssl_crock_st;
  typedef struct tls_session_ticket_ext_st TLS_SESSION_TICKET_EXT;
  typedef struct ssl_method_st SSL_METHOD;
  typedef struct ssl_cipher_st SSL_CIPHER;
  typedef struct ssl_session_st SSL_SESSION;
  typedef struct tls_sigalgs_st TLS_SIGALGS;
  typedef struct ssl_conf_ctx_st SSL_CONF_CTX;
  typedef struct ssl_comp_st SSL_COMP;
  
  STACK_OF(SSL_CIPHER);
  STACK_OF(SSL_COMP);
  
  /* SRTP protection profiles for use with the use_srtp extension (RFC 5764)*/
  typedef struct srtp_protection_profile_st {
      const char *name;
      unsigned long id;
  } SRTP_PROTECTION_PROFILE;
  
  DEFINE_STACK_OF(SRTP_PROTECTION_PROFILE)
  
  typedef int (*tls_session_ticket_ext_cb_fn)(SSL *s, const unsigned char *data,
                                              int len, void *arg);
  typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len,
                                          STACK_OF(SSL_CIPHER) *peer_ciphers,
                                          const SSL_CIPHER **cipher, void *arg);
  
  /* Extension context codes */
  /* This extension is only allowed in TLS */
  #define SSL_EXT_TLS_ONLY                        0x0001
  /* This extension is only allowed in DTLS */
  #define SSL_EXT_DTLS_ONLY                       0x0002
  /* Some extensions may be allowed in DTLS but we don't implement them for it */
  #define SSL_EXT_TLS_IMPLEMENTATION_ONLY         0x0004
  /* Most extensions are not defined for SSLv3 but EXT_TYPE_renegotiate is */
  #define SSL_EXT_SSL3_ALLOWED                    0x0008
  /* Extension is only defined for TLS1.2 and below */
  #define SSL_EXT_TLS1_2_AND_BELOW_ONLY           0x0010
  /* Extension is only defined for TLS1.3 and above */
  #define SSL_EXT_TLS1_3_ONLY                     0x0020
  /* Ignore this extension during parsing if we are resuming */
  #define SSL_EXT_IGNORE_ON_RESUMPTION            0x0040
  #define SSL_EXT_CLIENT_HELLO                    0x0080
  /* Really means TLS1.2 or below */
  #define SSL_EXT_TLS1_2_SERVER_HELLO             0x0100
  #define SSL_EXT_TLS1_3_SERVER_HELLO             0x0200
  #define SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS     0x0400
  #define SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST      0x0800
  #define SSL_EXT_TLS1_3_CERTIFICATE              0x1000
  #define SSL_EXT_TLS1_3_NEW_SESSION_TICKET       0x2000
  #define SSL_EXT_TLS1_3_CERTIFICATE_REQUEST      0x4000
  
  /* Typedefs for handling custom extensions */
  
  typedef int (*custom_ext_add_cb)(SSL *s, unsigned int ext_type,
                                   const unsigned char **out, size_t *outlen,
                                   int *al, void *add_arg);
  
  typedef void (*custom_ext_free_cb)(SSL *s, unsigned int ext_type,
                                     const unsigned char *out, void *add_arg);
  
  typedef int (*custom_ext_parse_cb)(SSL *s, unsigned int ext_type,
                                     const unsigned char *in, size_t inlen,
                                     int *al, void *parse_arg);
  
  
  typedef int (*SSL_custom_ext_add_cb_ex)(SSL *s, unsigned int ext_type,
                                          unsigned int context,
                                          const unsigned char **out,
                                          size_t *outlen, X509 *x,
                                          size_t chainidx,
                                          int *al, void *add_arg);
  
  typedef void (*SSL_custom_ext_free_cb_ex)(SSL *s, unsigned int ext_type,
                                            unsigned int context,
                                            const unsigned char *out,
                                            void *add_arg);
  
  typedef int (*SSL_custom_ext_parse_cb_ex)(SSL *s, unsigned int ext_type,
                                            unsigned int context,
                                            const unsigned char *in,
                                            size_t inlen, X509 *x,
                                            size_t chainidx,
                                            int *al, void *parse_arg);
  
  /* Typedef for verification callback */
  typedef int (*SSL_verify_cb)(int preverify_ok, X509_STORE_CTX *x509_ctx);
  
  /* Typedef for SSL async callback */
  typedef int (*SSL_async_callback_fn)(SSL *s, void *arg);
  
  /*
   * Some values are reserved until OpenSSL 1.2.0 because they were previously
   * included in SSL_OP_ALL in a 1.1.x release.
   *
   * Reserved value (until OpenSSL 1.2.0)                  0x00000001U
   * Reserved value (until OpenSSL 1.2.0)                  0x00000002U
   */
  /* Allow initial connection to servers that don't support RI */
  # define SSL_OP_LEGACY_SERVER_CONNECT                    0x00000004U
  
  /* Reserved value (until OpenSSL 1.2.0)                  0x00000008U */
  # define SSL_OP_TLSEXT_PADDING                           0x00000010U
  /* Reserved value (until OpenSSL 1.2.0)                  0x00000020U */
  # define SSL_OP_SAFARI_ECDHE_ECDSA_BUG                   0x00000040U
  /*
   * Reserved value (until OpenSSL 1.2.0)                  0x00000080U
   * Reserved value (until OpenSSL 1.2.0)                  0x00000100U
   * Reserved value (until OpenSSL 1.2.0)                  0x00000200U
   */
  
  /* In TLSv1.3 allow a non-(ec)dhe based kex_mode */
  # define SSL_OP_ALLOW_NO_DHE_KEX                         0x00000400U
  
  /*
   * Disable SSL 3.0/TLS 1.0 CBC vulnerability workaround that was added in
   * OpenSSL 0.9.6d.  Usually (depending on the application protocol) the
   * workaround is not needed.  Unfortunately some broken SSL/TLS
   * implementations cannot handle it at all, which is why we include it in
   * SSL_OP_ALL. Added in 0.9.6e
   */
  # define SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS              0x00000800U
  
  /* DTLS options */
  # define SSL_OP_NO_QUERY_MTU                             0x00001000U
  /* Turn on Cookie Exchange (on relevant for servers) */
  # define SSL_OP_COOKIE_EXCHANGE                          0x00002000U
  /* Don't use RFC4507 ticket extension */
  # define SSL_OP_NO_TICKET                                0x00004000U
  # ifndef OPENSSL_NO_DTLS1_METHOD
  /* Use Cisco's "speshul" version of DTLS_BAD_VER
   * (only with deprecated DTLSv1_client_method())  */
  #  define SSL_OP_CISCO_ANYCONNECT                        0x00008000U
  # endif
  
  /* As server, disallow session resumption on renegotiation */
  # define SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION   0x00010000U
  /* Don't use compression even if supported */
  # define SSL_OP_NO_COMPRESSION                           0x00020000U
  /* Permit unsafe legacy renegotiation */
  # define SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION        0x00040000U
  /* Disable encrypt-then-mac */
  # define SSL_OP_NO_ENCRYPT_THEN_MAC                      0x00080000U
  
  /*
   * Enable TLSv1.3 Compatibility mode. This is on by default. A future version
   * of OpenSSL may have this disabled by default.
   */
  # define SSL_OP_ENABLE_MIDDLEBOX_COMPAT                  0x00100000U
  
  /* Prioritize Chacha20Poly1305 when client does.
   * Modifies SSL_OP_CIPHER_SERVER_PREFERENCE */
  # define SSL_OP_PRIORITIZE_CHACHA                        0x00200000U
  
  /*
   * Set on servers to choose the cipher according to the server's preferences
   */
  # define SSL_OP_CIPHER_SERVER_PREFERENCE                 0x00400000U
  /*
   * If set, a server will allow a client to issue a SSLv3.0 version number as
   * latest version supported in the premaster secret, even when TLSv1.0
   * (version 3.1) was announced in the client hello. Normally this is
   * forbidden to prevent version rollback attacks.
   */
  # define SSL_OP_TLS_ROLLBACK_BUG                         0x00800000U
  
  /*
   * Switches off automatic TLSv1.3 anti-replay protection for early data. This
   * is a server-side option only (no effect on the client).
   */
  # define SSL_OP_NO_ANTI_REPLAY                           0x01000000U
  
  # define SSL_OP_NO_SSLv3                                 0x02000000U
  # define SSL_OP_NO_TLSv1                                 0x04000000U
  # define SSL_OP_NO_TLSv1_2                               0x08000000U
  # define SSL_OP_NO_TLSv1_1                               0x10000000U
  # define SSL_OP_NO_TLSv1_3                               0x20000000U
  
  # define SSL_OP_NO_DTLSv1                                0x04000000U
  # define SSL_OP_NO_DTLSv1_2                              0x08000000U
  
  # define SSL_OP_NO_SSL_MASK (SSL_OP_NO_SSLv3|\
          SSL_OP_NO_TLSv1|SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1_2|SSL_OP_NO_TLSv1_3)
  # define SSL_OP_NO_DTLS_MASK (SSL_OP_NO_DTLSv1|SSL_OP_NO_DTLSv1_2)
  
  /* Disallow all renegotiation */
  # define SSL_OP_NO_RENEGOTIATION                         0x40000000U
  
  /*
   * Make server add server-hello extension from early version of cryptopro
   * draft, when GOST ciphersuite is negotiated. Required for interoperability
   * with CryptoPro CSP 3.x
   */
  # define SSL_OP_CRYPTOPRO_TLSEXT_BUG                     0x80000000U
  
  /*
   * SSL_OP_ALL: various bug workarounds that should be rather harmless.
   * This used to be 0x000FFFFFL before 0.9.7.
   * This used to be 0x80000BFFU before 1.1.1.
   */
  # define SSL_OP_ALL        (SSL_OP_CRYPTOPRO_TLSEXT_BUG|\
                              SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS|\
                              SSL_OP_LEGACY_SERVER_CONNECT|\
                              SSL_OP_TLSEXT_PADDING|\
                              SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
  
  /* OBSOLETE OPTIONS: retained for compatibility */
  
  /* Removed from OpenSSL 1.1.0. Was 0x00000001L */
  /* Related to removed SSLv2. */
  # define SSL_OP_MICROSOFT_SESS_ID_BUG                    0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00000002L */
  /* Related to removed SSLv2. */
  # define SSL_OP_NETSCAPE_CHALLENGE_BUG                   0x0
  /* Removed from OpenSSL 0.9.8q and 1.0.0c. Was 0x00000008L */
  /* Dead forever, see CVE-2010-4180 */
  # define SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG         0x0
  /* Removed from OpenSSL 1.0.1h and 1.0.2. Was 0x00000010L */
  /* Refers to ancient SSLREF and SSLv2. */
  # define SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG              0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00000020 */
  # define SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER               0x0
  /* Removed from OpenSSL 0.9.7h and 0.9.8b. Was 0x00000040L */
  # define SSL_OP_MSIE_SSLV2_RSA_PADDING                   0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00000080 */
  /* Ancient SSLeay version. */
  # define SSL_OP_SSLEAY_080_CLIENT_DH_BUG                 0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00000100L */
  # define SSL_OP_TLS_D5_BUG                               0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00000200L */
  # define SSL_OP_TLS_BLOCK_PADDING_BUG                    0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00080000L */
  # define SSL_OP_SINGLE_ECDH_USE                          0x0
  /* Removed from OpenSSL 1.1.0. Was 0x00100000L */
  # define SSL_OP_SINGLE_DH_USE                            0x0
  /* Removed from OpenSSL 1.0.1k and 1.0.2. Was 0x00200000L */
  # define SSL_OP_EPHEMERAL_RSA                            0x0
  /* Removed from OpenSSL 1.1.0. Was 0x01000000L */
  # define SSL_OP_NO_SSLv2                                 0x0
  /* Removed from OpenSSL 1.0.1. Was 0x08000000L */
  # define SSL_OP_PKCS1_CHECK_1                            0x0
  /* Removed from OpenSSL 1.0.1. Was 0x10000000L */
  # define SSL_OP_PKCS1_CHECK_2                            0x0
  /* Removed from OpenSSL 1.1.0. Was 0x20000000L */
  # define SSL_OP_NETSCAPE_CA_DN_BUG                       0x0
  /* Removed from OpenSSL 1.1.0. Was 0x40000000L */
  # define SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG          0x0
  
  /*
   * Allow SSL_write(..., n) to return r with 0 < r < n (i.e. report success
   * when just a single record has been written):
   */
  # define SSL_MODE_ENABLE_PARTIAL_WRITE       0x00000001U
  /*
   * Make it possible to retry SSL_write() with changed buffer location (buffer
   * contents must stay the same!); this is not the default to avoid the
   * misconception that non-blocking SSL_write() behaves like non-blocking
   * write():
   */
  # define SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER 0x00000002U
  /*
   * Never bother the application with retries if the transport is blocking:
   */
  # define SSL_MODE_AUTO_RETRY 0x00000004U
  /* Don't attempt to automatically build certificate chain */
  # define SSL_MODE_NO_AUTO_CHAIN 0x00000008U
  /*
   * Save RAM by releasing read and write buffers when they're empty. (SSL3 and
   * TLS only.) Released buffers are freed.
   */
  # define SSL_MODE_RELEASE_BUFFERS 0x00000010U
  /*
   * Send the current time in the Random fields of the ClientHello and
   * ServerHello records for compatibility with hypothetical implementations
   * that require it.
   */
  # define SSL_MODE_SEND_CLIENTHELLO_TIME 0x00000020U
  # define SSL_MODE_SEND_SERVERHELLO_TIME 0x00000040U
  /*
   * Send TLS_FALLBACK_SCSV in the ClientHello. To be set only by applications
   * that reconnect with a downgraded protocol version; see
   * draft-ietf-tls-downgrade-scsv-00 for details. DO NOT ENABLE THIS if your
   * application attempts a normal handshake. Only use this in explicit
   * fallback retries, following the guidance in
   * draft-ietf-tls-downgrade-scsv-00.
   */
  # define SSL_MODE_SEND_FALLBACK_SCSV 0x00000080U
  /*
   * Support Asynchronous operation
   */
  # define SSL_MODE_ASYNC 0x00000100U
  /*
   * Use the kernel TLS transmission data-path.
   */
  # define SSL_MODE_NO_KTLS_TX 0x00000200U
  /*
   * When using DTLS/SCTP, include the terminating zero in the label
   * used for computing the endpoint-pair shared secret. Required for
   * interoperability with implementations having this bug like these
   * older version of OpenSSL:
   * - OpenSSL 1.0.0 series
   * - OpenSSL 1.0.1 series
   * - OpenSSL 1.0.2 series
   * - OpenSSL 1.1.0 series
   * - OpenSSL 1.1.1 and 1.1.1a
   */
  # define SSL_MODE_DTLS_SCTP_LABEL_LENGTH_BUG 0x00000400U
  
  /* Cert related flags */
  /*
   * Many implementations ignore some aspects of the TLS standards such as
   * enforcing certificate chain algorithms. When this is set we enforce them.
   */
  # define SSL_CERT_FLAG_TLS_STRICT                0x00000001U
  
  /* Suite B modes, takes same values as certificate verify flags */
  # define SSL_CERT_FLAG_SUITEB_128_LOS_ONLY       0x10000
  /* Suite B 192 bit only mode */
  # define SSL_CERT_FLAG_SUITEB_192_LOS            0x20000
  /* Suite B 128 bit mode allowing 192 bit algorithms */
  # define SSL_CERT_FLAG_SUITEB_128_LOS            0x30000
  
  /* Perform all sorts of protocol violations for testing purposes */
  # define SSL_CERT_FLAG_BROKEN_PROTOCOL           0x10000000
  
  /* Flags for building certificate chains */
  /* Treat any existing certificates as untrusted CAs */
  # define SSL_BUILD_CHAIN_FLAG_UNTRUSTED          0x1
  /* Don't include root CA in chain */
  # define SSL_BUILD_CHAIN_FLAG_NO_ROOT            0x2
  /* Just check certificates already there */
  # define SSL_BUILD_CHAIN_FLAG_CHECK              0x4
  /* Ignore verification errors */
  # define SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR       0x8
  /* Clear verification errors from queue */
  # define SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR        0x10
  
  /* Flags returned by SSL_check_chain */
  /* Certificate can be used with this session */
  # define CERT_PKEY_VALID         0x1
  /* Certificate can also be used for signing */
  # define CERT_PKEY_SIGN          0x2
  /* EE certificate signing algorithm OK */
  # define CERT_PKEY_EE_SIGNATURE  0x10
  /* CA signature algorithms OK */
  # define CERT_PKEY_CA_SIGNATURE  0x20
  /* EE certificate parameters OK */
  # define CERT_PKEY_EE_PARAM      0x40
  /* CA certificate parameters OK */
  # define CERT_PKEY_CA_PARAM      0x80
  /* Signing explicitly allowed as opposed to SHA1 fallback */
  # define CERT_PKEY_EXPLICIT_SIGN 0x100
  /* Client CA issuer names match (always set for server cert) */
  # define CERT_PKEY_ISSUER_NAME   0x200
  /* Cert type matches client types (always set for server cert) */
  # define CERT_PKEY_CERT_TYPE     0x400
  /* Cert chain suitable to Suite B */
  # define CERT_PKEY_SUITEB        0x800
  
  # define SSL_CONF_FLAG_CMDLINE           0x1
  # define SSL_CONF_FLAG_FILE              0x2
  # define SSL_CONF_FLAG_CLIENT            0x4
  # define SSL_CONF_FLAG_SERVER            0x8
  # define SSL_CONF_FLAG_SHOW_ERRORS       0x10
  # define SSL_CONF_FLAG_CERTIFICATE       0x20
  # define SSL_CONF_FLAG_REQUIRE_PRIVATE   0x40
  /* Configuration value types */
  # define SSL_CONF_TYPE_UNKNOWN           0x0
  # define SSL_CONF_TYPE_STRING            0x1
  # define SSL_CONF_TYPE_FILE              0x2
  # define SSL_CONF_TYPE_DIR               0x3
  # define SSL_CONF_TYPE_NONE              0x4
  
  /* Maximum length of the application-controlled segment of a a TLSv1.3 cookie */
  # define SSL_COOKIE_LENGTH                       4096
  
  /*
   * Note: SSL[_CTX]_set_{options,mode} use |= op on the previous value, they
   * cannot be used to clear bits.
   */
  
  unsigned long SSL_CTX_get_options(const SSL_CTX *ctx);
  unsigned long SSL_get_options(const SSL *s);
  unsigned long SSL_CTX_clear_options(SSL_CTX *ctx, unsigned long op);
  unsigned long SSL_clear_options(SSL *s, unsigned long op);
  unsigned long SSL_CTX_set_options(SSL_CTX *ctx, unsigned long op);
  unsigned long SSL_set_options(SSL *s, unsigned long op);
  
  # define SSL_CTX_set_mode(ctx,op) \
          SSL_CTX_ctrl((ctx),SSL_CTRL_MODE,(op),NULL)
  # define SSL_CTX_clear_mode(ctx,op) \
          SSL_CTX_ctrl((ctx),SSL_CTRL_CLEAR_MODE,(op),NULL)
  # define SSL_CTX_get_mode(ctx) \
          SSL_CTX_ctrl((ctx),SSL_CTRL_MODE,0,NULL)
  # define SSL_clear_mode(ssl,op) \
          SSL_ctrl((ssl),SSL_CTRL_CLEAR_MODE,(op),NULL)
  # define SSL_set_mode(ssl,op) \
          SSL_ctrl((ssl),SSL_CTRL_MODE,(op),NULL)
  # define SSL_get_mode(ssl) \
          SSL_ctrl((ssl),SSL_CTRL_MODE,0,NULL)
  # define SSL_set_mtu(ssl, mtu) \
          SSL_ctrl((ssl),SSL_CTRL_SET_MTU,(mtu),NULL)
  # define DTLS_set_link_mtu(ssl, mtu) \
          SSL_ctrl((ssl),DTLS_CTRL_SET_LINK_MTU,(mtu),NULL)
  # define DTLS_get_link_min_mtu(ssl) \
          SSL_ctrl((ssl),DTLS_CTRL_GET_LINK_MIN_MTU,0,NULL)
  
  # define SSL_get_secure_renegotiation_support(ssl) \
          SSL_ctrl((ssl), SSL_CTRL_GET_RI_SUPPORT, 0, NULL)
  
  # ifndef OPENSSL_NO_HEARTBEATS
  #  define SSL_heartbeat(ssl) \
          SSL_ctrl((ssl),SSL_CTRL_DTLS_EXT_SEND_HEARTBEAT,0,NULL)
  # endif
  
  # define SSL_CTX_set_cert_flags(ctx,op) \
          SSL_CTX_ctrl((ctx),SSL_CTRL_CERT_FLAGS,(op),NULL)
  # define SSL_set_cert_flags(s,op) \
          SSL_ctrl((s),SSL_CTRL_CERT_FLAGS,(op),NULL)
  # define SSL_CTX_clear_cert_flags(ctx,op) \
          SSL_CTX_ctrl((ctx),SSL_CTRL_CLEAR_CERT_FLAGS,(op),NULL)
  # define SSL_clear_cert_flags(s,op) \
          SSL_ctrl((s),SSL_CTRL_CLEAR_CERT_FLAGS,(op),NULL)
  
  void SSL_CTX_set_msg_callback(SSL_CTX *ctx,
                                void (*cb) (int write_p, int version,
                                            int content_type, const void *buf,
                                            size_t len, SSL *ssl, void *arg));
  void SSL_set_msg_callback(SSL *ssl,
                            void (*cb) (int write_p, int version,
                                        int content_type, const void *buf,
                                        size_t len, SSL *ssl, void *arg));
  # define SSL_CTX_set_msg_callback_arg(ctx, arg) SSL_CTX_ctrl((ctx), SSL_CTRL_SET_MSG_CALLBACK_ARG, 0, (arg))
  # define SSL_set_msg_callback_arg(ssl, arg) SSL_ctrl((ssl), SSL_CTRL_SET_MSG_CALLBACK_ARG, 0, (arg))
  
  # define SSL_get_extms_support(s) \
          SSL_ctrl((s),SSL_CTRL_GET_EXTMS_SUPPORT,0,NULL)
  
  # ifndef OPENSSL_NO_SRP
  
  /* see tls_srp.c */
  __owur int SSL_SRP_CTX_init(SSL *s);
  __owur int SSL_CTX_SRP_CTX_init(SSL_CTX *ctx);
  int SSL_SRP_CTX_free(SSL *ctx);
  int SSL_CTX_SRP_CTX_free(SSL_CTX *ctx);
  __owur int SSL_srp_server_param_with_username(SSL *s, int *ad);
  __owur int SRP_Calc_A_param(SSL *s);
  
  # endif
  
  /* 100k max cert list */
  # define SSL_MAX_CERT_LIST_DEFAULT 1024*100
  
  # define SSL_SESSION_CACHE_MAX_SIZE_DEFAULT      (1024*20)
  
  /*
   * This callback type is used inside SSL_CTX, SSL, and in the functions that
   * set them. It is used to override the generation of SSL/TLS session IDs in
   * a server. Return value should be zero on an error, non-zero to proceed.
   * Also, callbacks should themselves check if the id they generate is unique
   * otherwise the SSL handshake will fail with an error - callbacks can do
   * this using the 'ssl' value they're passed by;
   * SSL_has_matching_session_id(ssl, id, *id_len) The length value passed in
   * is set at the maximum size the session ID can be. In SSLv3/TLSv1 it is 32
   * bytes. The callback can alter this length to be less if desired. It is
   * also an error for the callback to set the size to zero.
   */
  typedef int (*GEN_SESSION_CB) (SSL *ssl, unsigned char *id,
                                 unsigned int *id_len);
  
  # define SSL_SESS_CACHE_OFF                      0x0000
  # define SSL_SESS_CACHE_CLIENT                   0x0001
  # define SSL_SESS_CACHE_SERVER                   0x0002
  # define SSL_SESS_CACHE_BOTH     (SSL_SESS_CACHE_CLIENT|SSL_SESS_CACHE_SERVER)
  # define SSL_SESS_CACHE_NO_AUTO_CLEAR            0x0080
  /* enough comments already ... see SSL_CTX_set_session_cache_mode(3) */
  # define SSL_SESS_CACHE_NO_INTERNAL_LOOKUP       0x0100
  # define SSL_SESS_CACHE_NO_INTERNAL_STORE        0x0200
  # define SSL_SESS_CACHE_NO_INTERNAL \
          (SSL_SESS_CACHE_NO_INTERNAL_LOOKUP|SSL_SESS_CACHE_NO_INTERNAL_STORE)
  
  LHASH_OF(SSL_SESSION) *SSL_CTX_sessions(SSL_CTX *ctx);
  # define SSL_CTX_sess_number(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_NUMBER,0,NULL)
  # define SSL_CTX_sess_connect(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_CONNECT,0,NULL)
  # define SSL_CTX_sess_connect_good(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_CONNECT_GOOD,0,NULL)
  # define SSL_CTX_sess_connect_renegotiate(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_CONNECT_RENEGOTIATE,0,NULL)
  # define SSL_CTX_sess_accept(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_ACCEPT,0,NULL)
  # define SSL_CTX_sess_accept_renegotiate(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_ACCEPT_RENEGOTIATE,0,NULL)
  # define SSL_CTX_sess_accept_good(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_ACCEPT_GOOD,0,NULL)
  # define SSL_CTX_sess_hits(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_HIT,0,NULL)
  # define SSL_CTX_sess_cb_hits(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_CB_HIT,0,NULL)
  # define SSL_CTX_sess_misses(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_MISSES,0,NULL)
  # define SSL_CTX_sess_timeouts(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_TIMEOUTS,0,NULL)
  # define SSL_CTX_sess_cache_full(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_CACHE_FULL,0,NULL)
  
  void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
                               int (*new_session_cb) (struct ssl_st *ssl,
                                                      SSL_SESSION *sess));
  int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)) (struct ssl_st *ssl,
                                                SSL_SESSION *sess);
  void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
                                  void (*remove_session_cb) (struct ssl_ctx_st
                                                             *ctx,
                                                             SSL_SESSION *sess));
  void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)) (struct ssl_ctx_st *ctx,
                                                    SSL_SESSION *sess);
  void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
                               SSL_SESSION *(*get_session_cb) (struct ssl_st
                                                               *ssl,
                                                               const unsigned char
                                                               *data, int len,
                                                               int *copy));
  SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx)) (struct ssl_st *ssl,
                                                         const unsigned char *data,
                                                         int len, int *copy);
  void SSL_CTX_set_info_callback(SSL_CTX *ctx,
                                 void (*cb) (const SSL *ssl, int type, int val));
  void (*SSL_CTX_get_info_callback(SSL_CTX *ctx)) (const SSL *ssl, int type,
                                                   int val);
  void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
                                  int (*client_cert_cb) (SSL *ssl, X509 **x509,
                                                         EVP_PKEY **pkey));
  int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx)) (SSL *ssl, X509 **x509,
                                                   EVP_PKEY **pkey);
  # ifndef OPENSSL_NO_ENGINE
  __owur int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e);
  # endif
  void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
                                      int (*app_gen_cookie_cb) (SSL *ssl,
                                                                unsigned char
                                                                *cookie,
                                                                unsigned int
                                                                *cookie_len));
  void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
                                    int (*app_verify_cookie_cb) (SSL *ssl,
                                                                 const unsigned
                                                                 char *cookie,
                                                                 unsigned int
                                                                 cookie_len));
  
  void SSL_CTX_set_stateless_cookie_generate_cb(
      SSL_CTX *ctx,
      int (*gen_stateless_cookie_cb) (SSL *ssl,
                                      unsigned char *cookie,
                                      size_t *cookie_len));
  void SSL_CTX_set_stateless_cookie_verify_cb(
      SSL_CTX *ctx,
      int (*verify_stateless_cookie_cb) (SSL *ssl,
                                         const unsigned char *cookie,
                                         size_t cookie_len));
  # ifndef OPENSSL_NO_NEXTPROTONEG
  
  typedef int (*SSL_CTX_npn_advertised_cb_func)(SSL *ssl,
                                                const unsigned char **out,
                                                unsigned int *outlen,
                                                void *arg);
  void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *s,
                                             SSL_CTX_npn_advertised_cb_func cb,
                                             void *arg);
  #  define SSL_CTX_set_npn_advertised_cb SSL_CTX_set_next_protos_advertised_cb
  
  typedef int (*SSL_CTX_npn_select_cb_func)(SSL *s,
                                            unsigned char **out,
                                            unsigned char *outlen,
                                            const unsigned char *in,
                                            unsigned int inlen,
                                            void *arg);
  void SSL_CTX_set_next_proto_select_cb(SSL_CTX *s,
                                        SSL_CTX_npn_select_cb_func cb,
                                        void *arg);
  #  define SSL_CTX_set_npn_select_cb SSL_CTX_set_next_proto_select_cb
  
  void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data,
                                      unsigned *len);
  #  define SSL_get0_npn_negotiated SSL_get0_next_proto_negotiated
  # endif
  
  __owur int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
                                   const unsigned char *in, unsigned int inlen,
                                   const unsigned char *client,
                                   unsigned int client_len);
  
  # define OPENSSL_NPN_UNSUPPORTED 0
  # define OPENSSL_NPN_NEGOTIATED  1
  # define OPENSSL_NPN_NO_OVERLAP  2
  
  __owur int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos,
                                     unsigned int protos_len);
  __owur int SSL_set_alpn_protos(SSL *ssl, const unsigned char *protos,
                                 unsigned int protos_len);
  typedef int (*SSL_CTX_alpn_select_cb_func)(SSL *ssl,
                                             const unsigned char **out,
                                             unsigned char *outlen,
                                             const unsigned char *in,
                                             unsigned int inlen,
                                             void *arg);
  void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
                                  SSL_CTX_alpn_select_cb_func cb,
                                  void *arg);
  void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
                              unsigned int *len);
  
  # ifndef OPENSSL_NO_PSK
  /*
   * the maximum length of the buffer given to callbacks containing the
   * resulting identity/psk
   */
  #  define PSK_MAX_IDENTITY_LEN 128
  #  define PSK_MAX_PSK_LEN 256
  typedef unsigned int (*SSL_psk_client_cb_func)(SSL *ssl,
                                                 const char *hint,
                                                 char *identity,
                                                 unsigned int max_identity_len,
                                                 unsigned char *psk,
                                                 unsigned int max_psk_len);
  void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx, SSL_psk_client_cb_func cb);
  void SSL_set_psk_client_callback(SSL *ssl, SSL_psk_client_cb_func cb);
  
  typedef unsigned int (*SSL_psk_server_cb_func)(SSL *ssl,
                                                 const char *identity,
                                                 unsigned char *psk,
                                                 unsigned int max_psk_len);
  void SSL_CTX_set_psk_server_callback(SSL_CTX *ctx, SSL_psk_server_cb_func cb);
  void SSL_set_psk_server_callback(SSL *ssl, SSL_psk_server_cb_func cb);
  
  __owur int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint);
  __owur int SSL_use_psk_identity_hint(SSL *s, const char *identity_hint);
  const char *SSL_get_psk_identity_hint(const SSL *s);
  const char *SSL_get_psk_identity(const SSL *s);
  # endif
  
  typedef int (*SSL_psk_find_session_cb_func)(SSL *ssl,
                                              const unsigned char *identity,
                                              size_t identity_len,
                                              SSL_SESSION **sess);
  typedef int (*SSL_psk_use_session_cb_func)(SSL *ssl, const EVP_MD *md,
                                             const unsigned char **id,
                                             size_t *idlen,
                                             SSL_SESSION **sess);
  
  void SSL_set_psk_find_session_callback(SSL *s, SSL_psk_find_session_cb_func cb);
  void SSL_CTX_set_psk_find_session_callback(SSL_CTX *ctx,
                                             SSL_psk_find_session_cb_func cb);
  void SSL_set_psk_use_session_callback(SSL *s, SSL_psk_use_session_cb_func cb);
  void SSL_CTX_set_psk_use_session_callback(SSL_CTX *ctx,
                                            SSL_psk_use_session_cb_func cb);
  
  /* Register callbacks to handle custom TLS Extensions for client or server. */
  
  __owur int SSL_CTX_has_client_custom_ext(const SSL_CTX *ctx,
                                           unsigned int ext_type);
  
  __owur int SSL_CTX_add_client_custom_ext(SSL_CTX *ctx,
                                           unsigned int ext_type,
                                           custom_ext_add_cb add_cb,
                                           custom_ext_free_cb free_cb,
                                           void *add_arg,
                                           custom_ext_parse_cb parse_cb,
                                           void *parse_arg);
  
  __owur int SSL_CTX_add_server_custom_ext(SSL_CTX *ctx,
                                           unsigned int ext_type,
                                           custom_ext_add_cb add_cb,
                                           custom_ext_free_cb free_cb,
                                           void *add_arg,
                                           custom_ext_parse_cb parse_cb,
                                           void *parse_arg);
  
  __owur int SSL_CTX_add_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
                                    unsigned int context,
                                    SSL_custom_ext_add_cb_ex add_cb,
                                    SSL_custom_ext_free_cb_ex free_cb,
                                    void *add_arg,
                                    SSL_custom_ext_parse_cb_ex parse_cb,
                                    void *parse_arg);
  
  __owur int SSL_extension_supported(unsigned int ext_type);
  
  # define SSL_NOTHING            1
  # define SSL_WRITING            2
  # define SSL_READING            3
  # define SSL_X509_LOOKUP        4
  # define SSL_ASYNC_PAUSED       5
  # define SSL_ASYNC_NO_JOBS      6
  # define SSL_CLIENT_HELLO_CB    7
  
  /* These will only be used when doing non-blocking IO */
  # define SSL_want_nothing(s)         (SSL_want(s) == SSL_NOTHING)
  # define SSL_want_read(s)            (SSL_want(s) == SSL_READING)
  # define SSL_want_write(s)           (SSL_want(s) == SSL_WRITING)
  # define SSL_want_x509_lookup(s)     (SSL_want(s) == SSL_X509_LOOKUP)
  # define SSL_want_async(s)           (SSL_want(s) == SSL_ASYNC_PAUSED)
  # define SSL_want_async_job(s)       (SSL_want(s) == SSL_ASYNC_NO_JOBS)
  # define SSL_want_client_hello_cb(s) (SSL_want(s) == SSL_CLIENT_HELLO_CB)
  
  # define SSL_MAC_FLAG_READ_MAC_STREAM 1
  # define SSL_MAC_FLAG_WRITE_MAC_STREAM 2
  
  /*
   * A callback for logging out TLS key material. This callback should log out
   * |line| followed by a newline.
   */
  typedef void (*SSL_CTX_keylog_cb_func)(const SSL *ssl, const char *line);
  
  /*
   * SSL_CTX_set_keylog_callback configures a callback to log key material. This
   * is intended for debugging use with tools like Wireshark. The cb function
   * should log line followed by a newline.
   */
  void SSL_CTX_set_keylog_callback(SSL_CTX *ctx, SSL_CTX_keylog_cb_func cb);
  
  /*
   * SSL_CTX_get_keylog_callback returns the callback configured by
   * SSL_CTX_set_keylog_callback.
   */
  SSL_CTX_keylog_cb_func SSL_CTX_get_keylog_callback(const SSL_CTX *ctx);
  
  int SSL_CTX_set_max_early_data(SSL_CTX *ctx, uint32_t max_early_data);
  uint32_t SSL_CTX_get_max_early_data(const SSL_CTX *ctx);
  int SSL_set_max_early_data(SSL *s, uint32_t max_early_data);
  uint32_t SSL_get_max_early_data(const SSL *s);
  int SSL_CTX_set_recv_max_early_data(SSL_CTX *ctx, uint32_t recv_max_early_data);
  uint32_t SSL_CTX_get_recv_max_early_data(const SSL_CTX *ctx);
  int SSL_set_recv_max_early_data(SSL *s, uint32_t recv_max_early_data);
  uint32_t SSL_get_recv_max_early_data(const SSL *s);
  
  #ifdef __cplusplus
  }
  #endif
  
  # include <openssl/ssl2.h>
  # include <openssl/ssl3.h>
  # include <openssl/tls1.h>      /* This is mostly sslv3 with a few tweaks */
  # include <openssl/dtls1.h>     /* Datagram TLS */
  # include <openssl/srtp.h>      /* Support for the use_srtp extension */
  
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /*
   * These need to be after the above set of includes due to a compiler bug
   * in VisualStudio 2015
   */
  DEFINE_STACK_OF_CONST(SSL_CIPHER)
  DEFINE_STACK_OF(SSL_COMP)
  
  /* compatibility */
  # define SSL_set_app_data(s,arg)         (SSL_set_ex_data(s,0,(char *)(arg)))
  # define SSL_get_app_data(s)             (SSL_get_ex_data(s,0))
  # define SSL_SESSION_set_app_data(s,a)   (SSL_SESSION_set_ex_data(s,0, \
                                                                    (char *)(a)))
  # define SSL_SESSION_get_app_data(s)     (SSL_SESSION_get_ex_data(s,0))
  # define SSL_CTX_get_app_data(ctx)       (SSL_CTX_get_ex_data(ctx,0))
  # define SSL_CTX_set_app_data(ctx,arg)   (SSL_CTX_set_ex_data(ctx,0, \
                                                                (char *)(arg)))
  DEPRECATEDIN_1_1_0(void SSL_set_debug(SSL *s, int debug))
  
  /* TLSv1.3 KeyUpdate message types */
  /* -1 used so that this is an invalid value for the on-the-wire protocol */
  #define SSL_KEY_UPDATE_NONE             -1
  /* Values as defined for the on-the-wire protocol */
  #define SSL_KEY_UPDATE_NOT_REQUESTED     0
  #define SSL_KEY_UPDATE_REQUESTED         1
  
  /*
   * The valid handshake states (one for each type message sent and one for each
   * type of message received). There are also two "special" states:
   * TLS = TLS or DTLS state
   * DTLS = DTLS specific state
   * CR/SR = Client Read/Server Read
   * CW/SW = Client Write/Server Write
   *
   * The "special" states are:
   * TLS_ST_BEFORE = No handshake has been initiated yet
   * TLS_ST_OK = A handshake has been successfully completed
   */
  typedef enum {
      TLS_ST_BEFORE,
      TLS_ST_OK,
      DTLS_ST_CR_HELLO_VERIFY_REQUEST,
      TLS_ST_CR_SRVR_HELLO,
      TLS_ST_CR_CERT,
      TLS_ST_CR_CERT_STATUS,
      TLS_ST_CR_KEY_EXCH,
      TLS_ST_CR_CERT_REQ,
      TLS_ST_CR_SRVR_DONE,
      TLS_ST_CR_SESSION_TICKET,
      TLS_ST_CR_CHANGE,
      TLS_ST_CR_FINISHED,
      TLS_ST_CW_CLNT_HELLO,
      TLS_ST_CW_CERT,
      TLS_ST_CW_KEY_EXCH,
      TLS_ST_CW_CERT_VRFY,
      TLS_ST_CW_CHANGE,
      TLS_ST_CW_NEXT_PROTO,
      TLS_ST_CW_FINISHED,
      TLS_ST_SW_HELLO_REQ,
      TLS_ST_SR_CLNT_HELLO,
      DTLS_ST_SW_HELLO_VERIFY_REQUEST,
      TLS_ST_SW_SRVR_HELLO,
      TLS_ST_SW_CERT,
      TLS_ST_SW_KEY_EXCH,
      TLS_ST_SW_CERT_REQ,
      TLS_ST_SW_SRVR_DONE,
      TLS_ST_SR_CERT,
      TLS_ST_SR_KEY_EXCH,
      TLS_ST_SR_CERT_VRFY,
      TLS_ST_SR_NEXT_PROTO,
      TLS_ST_SR_CHANGE,
      TLS_ST_SR_FINISHED,
      TLS_ST_SW_SESSION_TICKET,
      TLS_ST_SW_CERT_STATUS,
      TLS_ST_SW_CHANGE,
      TLS_ST_SW_FINISHED,
      TLS_ST_SW_ENCRYPTED_EXTENSIONS,
      TLS_ST_CR_ENCRYPTED_EXTENSIONS,
      TLS_ST_CR_CERT_VRFY,
      TLS_ST_SW_CERT_VRFY,
      TLS_ST_CR_HELLO_REQ,
      TLS_ST_SW_KEY_UPDATE,
      TLS_ST_CW_KEY_UPDATE,
      TLS_ST_SR_KEY_UPDATE,
      TLS_ST_CR_KEY_UPDATE,
      TLS_ST_EARLY_DATA,
      TLS_ST_PENDING_EARLY_DATA_END,
      TLS_ST_CW_END_OF_EARLY_DATA,
      TLS_ST_SR_END_OF_EARLY_DATA
  } OSSL_HANDSHAKE_STATE;
  
  /*
   * Most of the following state values are no longer used and are defined to be
   * the closest equivalent value in the current state machine code. Not all
   * defines have an equivalent and are set to a dummy value (-1). SSL_ST_CONNECT
   * and SSL_ST_ACCEPT are still in use in the definition of SSL_CB_ACCEPT_LOOP,
   * SSL_CB_ACCEPT_EXIT, SSL_CB_CONNECT_LOOP and SSL_CB_CONNECT_EXIT.
   */
  
  # define SSL_ST_CONNECT                  0x1000
  # define SSL_ST_ACCEPT                   0x2000
  
  # define SSL_ST_MASK                     0x0FFF
  
  # define SSL_CB_LOOP                     0x01
  # define SSL_CB_EXIT                     0x02
  # define SSL_CB_READ                     0x04
  # define SSL_CB_WRITE                    0x08
  # define SSL_CB_ALERT                    0x4000/* used in callback */
  # define SSL_CB_READ_ALERT               (SSL_CB_ALERT|SSL_CB_READ)
  # define SSL_CB_WRITE_ALERT              (SSL_CB_ALERT|SSL_CB_WRITE)
  # define SSL_CB_ACCEPT_LOOP              (SSL_ST_ACCEPT|SSL_CB_LOOP)
  # define SSL_CB_ACCEPT_EXIT              (SSL_ST_ACCEPT|SSL_CB_EXIT)
  # define SSL_CB_CONNECT_LOOP             (SSL_ST_CONNECT|SSL_CB_LOOP)
  # define SSL_CB_CONNECT_EXIT             (SSL_ST_CONNECT|SSL_CB_EXIT)
  # define SSL_CB_HANDSHAKE_START          0x10
  # define SSL_CB_HANDSHAKE_DONE           0x20
  
  /* Is the SSL_connection established? */
  # define SSL_in_connect_init(a)          (SSL_in_init(a) && !SSL_is_server(a))
  # define SSL_in_accept_init(a)           (SSL_in_init(a) && SSL_is_server(a))
  int SSL_in_init(const SSL *s);
  int SSL_in_before(const SSL *s);
  int SSL_is_init_finished(const SSL *s);
  
  /*
   * The following 3 states are kept in ssl->rlayer.rstate when reads fail, you
   * should not need these
   */
  # define SSL_ST_READ_HEADER                      0xF0
  # define SSL_ST_READ_BODY                        0xF1
  # define SSL_ST_READ_DONE                        0xF2
  
  /*-
   * Obtain latest Finished message
   *   -- that we sent (SSL_get_finished)
   *   -- that we expected from peer (SSL_get_peer_finished).
   * Returns length (0 == no Finished so far), copies up to 'count' bytes.
   */
  size_t SSL_get_finished(const SSL *s, void *buf, size_t count);
  size_t SSL_get_peer_finished(const SSL *s, void *buf, size_t count);
  
  /*
   * use either SSL_VERIFY_NONE or SSL_VERIFY_PEER, the last 3 options are
   * 'ored' with SSL_VERIFY_PEER if they are desired
   */
  # define SSL_VERIFY_NONE                 0x00
  # define SSL_VERIFY_PEER                 0x01
  # define SSL_VERIFY_FAIL_IF_NO_PEER_CERT 0x02
  # define SSL_VERIFY_CLIENT_ONCE          0x04
  # define SSL_VERIFY_POST_HANDSHAKE       0x08
  
  # if !OPENSSL_API_1_1_0
  #  define OpenSSL_add_ssl_algorithms()   SSL_library_init()
  #  define SSLeay_add_ssl_algorithms()    SSL_library_init()
  # endif
  
  /* More backward compatibility */
  # define SSL_get_cipher(s) \
                  SSL_CIPHER_get_name(SSL_get_current_cipher(s))
  # define SSL_get_cipher_bits(s,np) \
                  SSL_CIPHER_get_bits(SSL_get_current_cipher(s),np)
  # define SSL_get_cipher_version(s) \
                  SSL_CIPHER_get_version(SSL_get_current_cipher(s))
  # define SSL_get_cipher_name(s) \
                  SSL_CIPHER_get_name(SSL_get_current_cipher(s))
  # define SSL_get_time(a)         SSL_SESSION_get_time(a)
  # define SSL_set_time(a,b)       SSL_SESSION_set_time((a),(b))
  # define SSL_get_timeout(a)      SSL_SESSION_get_timeout(a)
  # define SSL_set_timeout(a,b)    SSL_SESSION_set_timeout((a),(b))
  
  # define d2i_SSL_SESSION_bio(bp,s_id) ASN1_d2i_bio_of(SSL_SESSION,SSL_SESSION_new,d2i_SSL_SESSION,bp,s_id)
  # define i2d_SSL_SESSION_bio(bp,s_id) ASN1_i2d_bio_of(SSL_SESSION,i2d_SSL_SESSION,bp,s_id)
  
  DECLARE_PEM_rw(SSL_SESSION, SSL_SESSION)
  # define SSL_AD_REASON_OFFSET            1000/* offset to get SSL_R_... value
                                                * from SSL_AD_... */
  /* These alert types are for SSLv3 and TLSv1 */
  # define SSL_AD_CLOSE_NOTIFY             SSL3_AD_CLOSE_NOTIFY
  /* fatal */
  # define SSL_AD_UNEXPECTED_MESSAGE       SSL3_AD_UNEXPECTED_MESSAGE
  /* fatal */
  # define SSL_AD_BAD_RECORD_MAC           SSL3_AD_BAD_RECORD_MAC
  # define SSL_AD_DECRYPTION_FAILED        TLS1_AD_DECRYPTION_FAILED
  # define SSL_AD_RECORD_OVERFLOW          TLS1_AD_RECORD_OVERFLOW
  /* fatal */
  # define SSL_AD_DECOMPRESSION_FAILURE    SSL3_AD_DECOMPRESSION_FAILURE
  /* fatal */
  # define SSL_AD_HANDSHAKE_FAILURE        SSL3_AD_HANDSHAKE_FAILURE
  /* Not for TLS */
  # define SSL_AD_NO_CERTIFICATE           SSL3_AD_NO_CERTIFICATE
  # define SSL_AD_BAD_CERTIFICATE          SSL3_AD_BAD_CERTIFICATE
  # define SSL_AD_UNSUPPORTED_CERTIFICATE  SSL3_AD_UNSUPPORTED_CERTIFICATE
  # define SSL_AD_CERTIFICATE_REVOKED      SSL3_AD_CERTIFICATE_REVOKED
  # define SSL_AD_CERTIFICATE_EXPIRED      SSL3_AD_CERTIFICATE_EXPIRED
  # define SSL_AD_CERTIFICATE_UNKNOWN      SSL3_AD_CERTIFICATE_UNKNOWN
  /* fatal */
  # define SSL_AD_ILLEGAL_PARAMETER        SSL3_AD_ILLEGAL_PARAMETER
  /* fatal */
  # define SSL_AD_UNKNOWN_CA               TLS1_AD_UNKNOWN_CA
  /* fatal */
  # define SSL_AD_ACCESS_DENIED            TLS1_AD_ACCESS_DENIED
  /* fatal */
  # define SSL_AD_DECODE_ERROR             TLS1_AD_DECODE_ERROR
  # define SSL_AD_DECRYPT_ERROR            TLS1_AD_DECRYPT_ERROR
  /* fatal */
  # define SSL_AD_EXPORT_RESTRICTION       TLS1_AD_EXPORT_RESTRICTION
  /* fatal */
  # define SSL_AD_PROTOCOL_VERSION         TLS1_AD_PROTOCOL_VERSION
  /* fatal */
  # define SSL_AD_INSUFFICIENT_SECURITY    TLS1_AD_INSUFFICIENT_SECURITY
  /* fatal */
  # define SSL_AD_INTERNAL_ERROR           TLS1_AD_INTERNAL_ERROR
  # define SSL_AD_USER_CANCELLED           TLS1_AD_USER_CANCELLED
  # define SSL_AD_NO_RENEGOTIATION         TLS1_AD_NO_RENEGOTIATION
  # define SSL_AD_MISSING_EXTENSION        TLS13_AD_MISSING_EXTENSION
  # define SSL_AD_CERTIFICATE_REQUIRED     TLS13_AD_CERTIFICATE_REQUIRED
  # define SSL_AD_UNSUPPORTED_EXTENSION    TLS1_AD_UNSUPPORTED_EXTENSION
  # define SSL_AD_CERTIFICATE_UNOBTAINABLE TLS1_AD_CERTIFICATE_UNOBTAINABLE
  # define SSL_AD_UNRECOGNIZED_NAME        TLS1_AD_UNRECOGNIZED_NAME
  # define SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE
  # define SSL_AD_BAD_CERTIFICATE_HASH_VALUE TLS1_AD_BAD_CERTIFICATE_HASH_VALUE
  /* fatal */
  # define SSL_AD_UNKNOWN_PSK_IDENTITY     TLS1_AD_UNKNOWN_PSK_IDENTITY
  /* fatal */
  # define SSL_AD_INAPPROPRIATE_FALLBACK   TLS1_AD_INAPPROPRIATE_FALLBACK
  # define SSL_AD_NO_APPLICATION_PROTOCOL  TLS1_AD_NO_APPLICATION_PROTOCOL
  # define SSL_ERROR_NONE                  0
  # define SSL_ERROR_SSL                   1
  # define SSL_ERROR_WANT_READ             2
  # define SSL_ERROR_WANT_WRITE            3
  # define SSL_ERROR_WANT_X509_LOOKUP      4
  # define SSL_ERROR_SYSCALL               5/* look at error stack/return
                                             * value/errno */
  # define SSL_ERROR_ZERO_RETURN           6
  # define SSL_ERROR_WANT_CONNECT          7
  # define SSL_ERROR_WANT_ACCEPT           8
  # define SSL_ERROR_WANT_ASYNC            9
  # define SSL_ERROR_WANT_ASYNC_JOB       10
  # define SSL_ERROR_WANT_CLIENT_HELLO_CB 11
  # define SSL_CTRL_SET_TMP_DH                     3
  # define SSL_CTRL_SET_TMP_ECDH                   4
  # define SSL_CTRL_SET_TMP_DH_CB                  6
  # define SSL_CTRL_GET_CLIENT_CERT_REQUEST        9
  # define SSL_CTRL_GET_NUM_RENEGOTIATIONS         10
  # define SSL_CTRL_CLEAR_NUM_RENEGOTIATIONS       11
  # define SSL_CTRL_GET_TOTAL_RENEGOTIATIONS       12
  # define SSL_CTRL_GET_FLAGS                      13
  # define SSL_CTRL_EXTRA_CHAIN_CERT               14
  # define SSL_CTRL_SET_MSG_CALLBACK               15
  # define SSL_CTRL_SET_MSG_CALLBACK_ARG           16
  /* only applies to datagram connections */
  # define SSL_CTRL_SET_MTU                17
  /* Stats */
  # define SSL_CTRL_SESS_NUMBER                    20
  # define SSL_CTRL_SESS_CONNECT                   21
  # define SSL_CTRL_SESS_CONNECT_GOOD              22
  # define SSL_CTRL_SESS_CONNECT_RENEGOTIATE       23
  # define SSL_CTRL_SESS_ACCEPT                    24
  # define SSL_CTRL_SESS_ACCEPT_GOOD               25
  # define SSL_CTRL_SESS_ACCEPT_RENEGOTIATE        26
  # define SSL_CTRL_SESS_HIT                       27
  # define SSL_CTRL_SESS_CB_HIT                    28
  # define SSL_CTRL_SESS_MISSES                    29
  # define SSL_CTRL_SESS_TIMEOUTS                  30
  # define SSL_CTRL_SESS_CACHE_FULL                31
  # define SSL_CTRL_MODE                           33
  # define SSL_CTRL_GET_READ_AHEAD                 40
  # define SSL_CTRL_SET_READ_AHEAD                 41
  # define SSL_CTRL_SET_SESS_CACHE_SIZE            42
  # define SSL_CTRL_GET_SESS_CACHE_SIZE            43
  # define SSL_CTRL_SET_SESS_CACHE_MODE            44
  # define SSL_CTRL_GET_SESS_CACHE_MODE            45
  # define SSL_CTRL_GET_MAX_CERT_LIST              50
  # define SSL_CTRL_SET_MAX_CERT_LIST              51
  # define SSL_CTRL_SET_MAX_SEND_FRAGMENT          52
  /* see tls1.h for macros based on these */
  # define SSL_CTRL_SET_TLSEXT_SERVERNAME_CB       53
  # define SSL_CTRL_SET_TLSEXT_SERVERNAME_ARG      54
  # define SSL_CTRL_SET_TLSEXT_HOSTNAME            55
  # define SSL_CTRL_SET_TLSEXT_DEBUG_CB            56
  # define SSL_CTRL_SET_TLSEXT_DEBUG_ARG           57
  # define SSL_CTRL_GET_TLSEXT_TICKET_KEYS         58
  # define SSL_CTRL_SET_TLSEXT_TICKET_KEYS         59
  /*# define SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT    60 */
  /*# define SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT_CB 61 */
  /*# define SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT_CB_ARG 62 */
  # define SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB       63
  # define SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB_ARG   64
  # define SSL_CTRL_SET_TLSEXT_STATUS_REQ_TYPE     65
  # define SSL_CTRL_GET_TLSEXT_STATUS_REQ_EXTS     66
  # define SSL_CTRL_SET_TLSEXT_STATUS_REQ_EXTS     67
  # define SSL_CTRL_GET_TLSEXT_STATUS_REQ_IDS      68
  # define SSL_CTRL_SET_TLSEXT_STATUS_REQ_IDS      69
  # define SSL_CTRL_GET_TLSEXT_STATUS_REQ_OCSP_RESP        70
  # define SSL_CTRL_SET_TLSEXT_STATUS_REQ_OCSP_RESP        71
  # define SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB       72
  # define SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB    75
  # define SSL_CTRL_SET_SRP_VERIFY_PARAM_CB                76
  # define SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB             77
  # define SSL_CTRL_SET_SRP_ARG            78
  # define SSL_CTRL_SET_TLS_EXT_SRP_USERNAME               79
  # define SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH               80
  # define SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD               81
  # ifndef OPENSSL_NO_HEARTBEATS
  #  define SSL_CTRL_DTLS_EXT_SEND_HEARTBEAT               85
  #  define SSL_CTRL_GET_DTLS_EXT_HEARTBEAT_PENDING        86
  #  define SSL_CTRL_SET_DTLS_EXT_HEARTBEAT_NO_REQUESTS    87
  # endif
  # define DTLS_CTRL_GET_TIMEOUT           73
  # define DTLS_CTRL_HANDLE_TIMEOUT        74
  # define SSL_CTRL_GET_RI_SUPPORT                 76
  # define SSL_CTRL_CLEAR_MODE                     78
  # define SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB      79
  # define SSL_CTRL_GET_EXTRA_CHAIN_CERTS          82
  # define SSL_CTRL_CLEAR_EXTRA_CHAIN_CERTS        83
  # define SSL_CTRL_CHAIN                          88
  # define SSL_CTRL_CHAIN_CERT                     89
  # define SSL_CTRL_GET_GROUPS                     90
  # define SSL_CTRL_SET_GROUPS                     91
  # define SSL_CTRL_SET_GROUPS_LIST                92
  # define SSL_CTRL_GET_SHARED_GROUP               93
  # define SSL_CTRL_SET_SIGALGS                    97
  # define SSL_CTRL_SET_SIGALGS_LIST               98
  # define SSL_CTRL_CERT_FLAGS                     99
  # define SSL_CTRL_CLEAR_CERT_FLAGS               100
  # define SSL_CTRL_SET_CLIENT_SIGALGS             101
  # define SSL_CTRL_SET_CLIENT_SIGALGS_LIST        102
  # define SSL_CTRL_GET_CLIENT_CERT_TYPES          103
  # define SSL_CTRL_SET_CLIENT_CERT_TYPES          104
  # define SSL_CTRL_BUILD_CERT_CHAIN               105
  # define SSL_CTRL_SET_VERIFY_CERT_STORE          106
  # define SSL_CTRL_SET_CHAIN_CERT_STORE           107
  # define SSL_CTRL_GET_PEER_SIGNATURE_NID         108
  # define SSL_CTRL_GET_PEER_TMP_KEY               109
  # define SSL_CTRL_GET_RAW_CIPHERLIST             110
  # define SSL_CTRL_GET_EC_POINT_FORMATS           111
  # define SSL_CTRL_GET_CHAIN_CERTS                115
  # define SSL_CTRL_SELECT_CURRENT_CERT            116
  # define SSL_CTRL_SET_CURRENT_CERT               117
  # define SSL_CTRL_SET_DH_AUTO                    118
  # define DTLS_CTRL_SET_LINK_MTU                  120
  # define DTLS_CTRL_GET_LINK_MIN_MTU              121
  # define SSL_CTRL_GET_EXTMS_SUPPORT              122
  # define SSL_CTRL_SET_MIN_PROTO_VERSION          123
  # define SSL_CTRL_SET_MAX_PROTO_VERSION          124
  # define SSL_CTRL_SET_SPLIT_SEND_FRAGMENT        125
  # define SSL_CTRL_SET_MAX_PIPELINES              126
  # define SSL_CTRL_GET_TLSEXT_STATUS_REQ_TYPE     127
  # define SSL_CTRL_GET_TLSEXT_STATUS_REQ_CB       128
  # define SSL_CTRL_GET_TLSEXT_STATUS_REQ_CB_ARG   129
  # define SSL_CTRL_GET_MIN_PROTO_VERSION          130
  # define SSL_CTRL_GET_MAX_PROTO_VERSION          131
  # define SSL_CTRL_GET_SIGNATURE_NID              132
  # define SSL_CTRL_GET_TMP_KEY                    133
  # define SSL_CERT_SET_FIRST                      1
  # define SSL_CERT_SET_NEXT                       2
  # define SSL_CERT_SET_SERVER                     3
  # define DTLSv1_get_timeout(ssl, arg) \
          SSL_ctrl(ssl,DTLS_CTRL_GET_TIMEOUT,0, (void *)(arg))
  # define DTLSv1_handle_timeout(ssl) \
          SSL_ctrl(ssl,DTLS_CTRL_HANDLE_TIMEOUT,0, NULL)
  # define SSL_num_renegotiations(ssl) \
          SSL_ctrl((ssl),SSL_CTRL_GET_NUM_RENEGOTIATIONS,0,NULL)
  # define SSL_clear_num_renegotiations(ssl) \
          SSL_ctrl((ssl),SSL_CTRL_CLEAR_NUM_RENEGOTIATIONS,0,NULL)
  # define SSL_total_renegotiations(ssl) \
          SSL_ctrl((ssl),SSL_CTRL_GET_TOTAL_RENEGOTIATIONS,0,NULL)
  # define SSL_CTX_set_tmp_dh(ctx,dh) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_DH,0,(char *)(dh))
  # define SSL_CTX_set_dh_auto(ctx, onoff) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_DH_AUTO,onoff,NULL)
  # define SSL_set_dh_auto(s, onoff) \
          SSL_ctrl(s,SSL_CTRL_SET_DH_AUTO,onoff,NULL)
  # define SSL_set_tmp_dh(ssl,dh) \
          SSL_ctrl(ssl,SSL_CTRL_SET_TMP_DH,0,(char *)(dh))
  # if !OPENSSL_API_3
  #  define SSL_CTX_set_tmp_ecdh(ctx,ecdh) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_ECDH,0,(char *)(ecdh))
  #  define SSL_set_tmp_ecdh(ssl,ecdh) \
          SSL_ctrl(ssl,SSL_CTRL_SET_TMP_ECDH,0,(char *)(ecdh))
  # endif
  # define SSL_CTX_add_extra_chain_cert(ctx,x509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_EXTRA_CHAIN_CERT,0,(char *)(x509))
  # define SSL_CTX_get_extra_chain_certs(ctx,px509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_EXTRA_CHAIN_CERTS,0,px509)
  # define SSL_CTX_get_extra_chain_certs_only(ctx,px509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_EXTRA_CHAIN_CERTS,1,px509)
  # define SSL_CTX_clear_extra_chain_certs(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_CLEAR_EXTRA_CHAIN_CERTS,0,NULL)
  # define SSL_CTX_set0_chain(ctx,sk) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_CHAIN,0,(char *)(sk))
  # define SSL_CTX_set1_chain(ctx,sk) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_CHAIN,1,(char *)(sk))
  # define SSL_CTX_add0_chain_cert(ctx,x509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_CHAIN_CERT,0,(char *)(x509))
  # define SSL_CTX_add1_chain_cert(ctx,x509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_CHAIN_CERT,1,(char *)(x509))
  # define SSL_CTX_get0_chain_certs(ctx,px509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_CHAIN_CERTS,0,px509)
  # define SSL_CTX_clear_chain_certs(ctx) \
          SSL_CTX_set0_chain(ctx,NULL)
  # define SSL_CTX_build_cert_chain(ctx, flags) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_BUILD_CERT_CHAIN, flags, NULL)
  # define SSL_CTX_select_current_cert(ctx,x509) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SELECT_CURRENT_CERT,0,(char *)(x509))
  # define SSL_CTX_set_current_cert(ctx, op) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CURRENT_CERT, op, NULL)
  # define SSL_CTX_set0_verify_cert_store(ctx,st) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_VERIFY_CERT_STORE,0,(char *)(st))
  # define SSL_CTX_set1_verify_cert_store(ctx,st) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_VERIFY_CERT_STORE,1,(char *)(st))
  # define SSL_CTX_set0_chain_cert_store(ctx,st) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CHAIN_CERT_STORE,0,(char *)(st))
  # define SSL_CTX_set1_chain_cert_store(ctx,st) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CHAIN_CERT_STORE,1,(char *)(st))
  # define SSL_set0_chain(ctx,sk) \
          SSL_ctrl(ctx,SSL_CTRL_CHAIN,0,(char *)(sk))
  # define SSL_set1_chain(ctx,sk) \
          SSL_ctrl(ctx,SSL_CTRL_CHAIN,1,(char *)(sk))
  # define SSL_add0_chain_cert(ctx,x509) \
          SSL_ctrl(ctx,SSL_CTRL_CHAIN_CERT,0,(char *)(x509))
  # define SSL_add1_chain_cert(ctx,x509) \
          SSL_ctrl(ctx,SSL_CTRL_CHAIN_CERT,1,(char *)(x509))
  # define SSL_get0_chain_certs(ctx,px509) \
          SSL_ctrl(ctx,SSL_CTRL_GET_CHAIN_CERTS,0,px509)
  # define SSL_clear_chain_certs(ctx) \
          SSL_set0_chain(ctx,NULL)
  # define SSL_build_cert_chain(s, flags) \
          SSL_ctrl(s,SSL_CTRL_BUILD_CERT_CHAIN, flags, NULL)
  # define SSL_select_current_cert(ctx,x509) \
          SSL_ctrl(ctx,SSL_CTRL_SELECT_CURRENT_CERT,0,(char *)(x509))
  # define SSL_set_current_cert(ctx,op) \
          SSL_ctrl(ctx,SSL_CTRL_SET_CURRENT_CERT, op, NULL)
  # define SSL_set0_verify_cert_store(s,st) \
          SSL_ctrl(s,SSL_CTRL_SET_VERIFY_CERT_STORE,0,(char *)(st))
  # define SSL_set1_verify_cert_store(s,st) \
          SSL_ctrl(s,SSL_CTRL_SET_VERIFY_CERT_STORE,1,(char *)(st))
  # define SSL_set0_chain_cert_store(s,st) \
          SSL_ctrl(s,SSL_CTRL_SET_CHAIN_CERT_STORE,0,(char *)(st))
  # define SSL_set1_chain_cert_store(s,st) \
          SSL_ctrl(s,SSL_CTRL_SET_CHAIN_CERT_STORE,1,(char *)(st))
  # define SSL_get1_groups(ctx, s) \
          SSL_ctrl(ctx,SSL_CTRL_GET_GROUPS,0,(char *)(s))
  # define SSL_CTX_set1_groups(ctx, glist, glistlen) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_GROUPS,glistlen,(char *)(glist))
  # define SSL_CTX_set1_groups_list(ctx, s) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_GROUPS_LIST,0,(char *)(s))
  # define SSL_set1_groups(ctx, glist, glistlen) \
          SSL_ctrl(ctx,SSL_CTRL_SET_GROUPS,glistlen,(char *)(glist))
  # define SSL_set1_groups_list(ctx, s) \
          SSL_ctrl(ctx,SSL_CTRL_SET_GROUPS_LIST,0,(char *)(s))
  # define SSL_get_shared_group(s, n) \
          SSL_ctrl(s,SSL_CTRL_GET_SHARED_GROUP,n,NULL)
  # define SSL_CTX_set1_sigalgs(ctx, slist, slistlen) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_SIGALGS,slistlen,(int *)(slist))
  # define SSL_CTX_set1_sigalgs_list(ctx, s) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_SIGALGS_LIST,0,(char *)(s))
  # define SSL_set1_sigalgs(ctx, slist, slistlen) \
          SSL_ctrl(ctx,SSL_CTRL_SET_SIGALGS,slistlen,(int *)(slist))
  # define SSL_set1_sigalgs_list(ctx, s) \
          SSL_ctrl(ctx,SSL_CTRL_SET_SIGALGS_LIST,0,(char *)(s))
  # define SSL_CTX_set1_client_sigalgs(ctx, slist, slistlen) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CLIENT_SIGALGS,slistlen,(int *)(slist))
  # define SSL_CTX_set1_client_sigalgs_list(ctx, s) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CLIENT_SIGALGS_LIST,0,(char *)(s))
  # define SSL_set1_client_sigalgs(ctx, slist, slistlen) \
          SSL_ctrl(ctx,SSL_CTRL_SET_CLIENT_SIGALGS,clistlen,(int *)(slist))
  # define SSL_set1_client_sigalgs_list(ctx, s) \
          SSL_ctrl(ctx,SSL_CTRL_SET_CLIENT_SIGALGS_LIST,0,(char *)(s))
  # define SSL_get0_certificate_types(s, clist) \
          SSL_ctrl(s, SSL_CTRL_GET_CLIENT_CERT_TYPES, 0, (char *)(clist))
  # define SSL_CTX_set1_client_certificate_types(ctx, clist, clistlen) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CLIENT_CERT_TYPES,clistlen, \
                       (char *)(clist))
  # define SSL_set1_client_certificate_types(s, clist, clistlen) \
          SSL_ctrl(s,SSL_CTRL_SET_CLIENT_CERT_TYPES,clistlen,(char *)(clist))
  # define SSL_get_signature_nid(s, pn) \
          SSL_ctrl(s,SSL_CTRL_GET_SIGNATURE_NID,0,pn)
  # define SSL_get_peer_signature_nid(s, pn) \
          SSL_ctrl(s,SSL_CTRL_GET_PEER_SIGNATURE_NID,0,pn)
  # define SSL_get_peer_tmp_key(s, pk) \
          SSL_ctrl(s,SSL_CTRL_GET_PEER_TMP_KEY,0,pk)
  # define SSL_get_tmp_key(s, pk) \
          SSL_ctrl(s,SSL_CTRL_GET_TMP_KEY,0,pk)
  # define SSL_get0_raw_cipherlist(s, plst) \
          SSL_ctrl(s,SSL_CTRL_GET_RAW_CIPHERLIST,0,plst)
  # define SSL_get0_ec_point_formats(s, plst) \
          SSL_ctrl(s,SSL_CTRL_GET_EC_POINT_FORMATS,0,plst)
  # define SSL_CTX_set_min_proto_version(ctx, version) \
          SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
  # define SSL_CTX_set_max_proto_version(ctx, version) \
          SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
  # define SSL_CTX_get_min_proto_version(ctx) \
          SSL_CTX_ctrl(ctx, SSL_CTRL_GET_MIN_PROTO_VERSION, 0, NULL)
  # define SSL_CTX_get_max_proto_version(ctx) \
          SSL_CTX_ctrl(ctx, SSL_CTRL_GET_MAX_PROTO_VERSION, 0, NULL)
  # define SSL_set_min_proto_version(s, version) \
          SSL_ctrl(s, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
  # define SSL_set_max_proto_version(s, version) \
          SSL_ctrl(s, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
  # define SSL_get_min_proto_version(s) \
          SSL_ctrl(s, SSL_CTRL_GET_MIN_PROTO_VERSION, 0, NULL)
  # define SSL_get_max_proto_version(s) \
          SSL_ctrl(s, SSL_CTRL_GET_MAX_PROTO_VERSION, 0, NULL)
  
  /* Backwards compatibility, original 1.1.0 names */
  # define SSL_CTRL_GET_SERVER_TMP_KEY \
           SSL_CTRL_GET_PEER_TMP_KEY
  # define SSL_get_server_tmp_key(s, pk) \
           SSL_get_peer_tmp_key(s, pk)
  
  /*
   * The following symbol names are old and obsolete. They are kept
   * for compatibility reasons only and should not be used anymore.
   */
  # define SSL_CTRL_GET_CURVES           SSL_CTRL_GET_GROUPS
  # define SSL_CTRL_SET_CURVES           SSL_CTRL_SET_GROUPS
  # define SSL_CTRL_SET_CURVES_LIST      SSL_CTRL_SET_GROUPS_LIST
  # define SSL_CTRL_GET_SHARED_CURVE     SSL_CTRL_GET_SHARED_GROUP
  
  # define SSL_get1_curves               SSL_get1_groups
  # define SSL_CTX_set1_curves           SSL_CTX_set1_groups
  # define SSL_CTX_set1_curves_list      SSL_CTX_set1_groups_list
  # define SSL_set1_curves               SSL_set1_groups
  # define SSL_set1_curves_list          SSL_set1_groups_list
  # define SSL_get_shared_curve          SSL_get_shared_group
  
  
  # if !OPENSSL_API_1_1_0
  /* Provide some compatibility macros for removed functionality. */
  #  define SSL_CTX_need_tmp_RSA(ctx)                0
  #  define SSL_CTX_set_tmp_rsa(ctx,rsa)             1
  #  define SSL_need_tmp_RSA(ssl)                    0
  #  define SSL_set_tmp_rsa(ssl,rsa)                 1
  #  define SSL_CTX_set_ecdh_auto(dummy, onoff)      ((onoff) != 0)
  #  define SSL_set_ecdh_auto(dummy, onoff)          ((onoff) != 0)
  /*
   * We "pretend" to call the callback to avoid warnings about unused static
   * functions.
   */
  #  define SSL_CTX_set_tmp_rsa_callback(ctx, cb)    while(0) (cb)(NULL, 0, 0)
  #  define SSL_set_tmp_rsa_callback(ssl, cb)        while(0) (cb)(NULL, 0, 0)
  # endif
  __owur const BIO_METHOD *BIO_f_ssl(void);
  __owur BIO *BIO_new_ssl(SSL_CTX *ctx, int client);
  __owur BIO *BIO_new_ssl_connect(SSL_CTX *ctx);
  __owur BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx);
  __owur int BIO_ssl_copy_session_id(BIO *to, BIO *from);
  void BIO_ssl_shutdown(BIO *ssl_bio);
  
  __owur int SSL_CTX_set_cipher_list(SSL_CTX *, const char *str);
  __owur SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth);
  int SSL_CTX_up_ref(SSL_CTX *ctx);
  void SSL_CTX_free(SSL_CTX *);
  __owur long SSL_CTX_set_timeout(SSL_CTX *ctx, long t);
  __owur long SSL_CTX_get_timeout(const SSL_CTX *ctx);
  __owur X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *);
  void SSL_CTX_set_cert_store(SSL_CTX *, X509_STORE *);
  void SSL_CTX_set1_cert_store(SSL_CTX *, X509_STORE *);
  __owur int SSL_want(const SSL *s);
  __owur int SSL_clear(SSL *s);
  
  void SSL_CTX_flush_sessions(SSL_CTX *ctx, long tm);
  
  __owur const SSL_CIPHER *SSL_get_current_cipher(const SSL *s);
  __owur const SSL_CIPHER *SSL_get_pending_cipher(const SSL *s);
  __owur int SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits);
  __owur const char *SSL_CIPHER_get_version(const SSL_CIPHER *c);
  __owur const char *SSL_CIPHER_get_name(const SSL_CIPHER *c);
  __owur const char *SSL_CIPHER_standard_name(const SSL_CIPHER *c);
  __owur const char *OPENSSL_cipher_name(const char *rfc_name);
  __owur uint32_t SSL_CIPHER_get_id(const SSL_CIPHER *c);
  __owur uint16_t SSL_CIPHER_get_protocol_id(const SSL_CIPHER *c);
  __owur int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c);
  __owur int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c);
  __owur const EVP_MD *SSL_CIPHER_get_handshake_digest(const SSL_CIPHER *c);
  __owur int SSL_CIPHER_is_aead(const SSL_CIPHER *c);
  
  __owur int SSL_get_fd(const SSL *s);
  __owur int SSL_get_rfd(const SSL *s);
  __owur int SSL_get_wfd(const SSL *s);
  __owur const char *SSL_get_cipher_list(const SSL *s, int n);
  __owur char *SSL_get_shared_ciphers(const SSL *s, char *buf, int size);
  __owur int SSL_get_read_ahead(const SSL *s);
  __owur int SSL_pending(const SSL *s);
  __owur int SSL_has_pending(const SSL *s);
  # ifndef OPENSSL_NO_SOCK
  __owur int SSL_set_fd(SSL *s, int fd);
  __owur int SSL_set_rfd(SSL *s, int fd);
  __owur int SSL_set_wfd(SSL *s, int fd);
  # endif
  void SSL_set0_rbio(SSL *s, BIO *rbio);
  void SSL_set0_wbio(SSL *s, BIO *wbio);
  void SSL_set_bio(SSL *s, BIO *rbio, BIO *wbio);
  __owur BIO *SSL_get_rbio(const SSL *s);
  __owur BIO *SSL_get_wbio(const SSL *s);
  __owur int SSL_set_cipher_list(SSL *s, const char *str);
  __owur int SSL_CTX_set_ciphersuites(SSL_CTX *ctx, const char *str);
  __owur int SSL_set_ciphersuites(SSL *s, const char *str);
  void SSL_set_read_ahead(SSL *s, int yes);
  __owur int SSL_get_verify_mode(const SSL *s);
  __owur int SSL_get_verify_depth(const SSL *s);
  __owur SSL_verify_cb SSL_get_verify_callback(const SSL *s);
  void SSL_set_verify(SSL *s, int mode, SSL_verify_cb callback);
  void SSL_set_verify_depth(SSL *s, int depth);
  void SSL_set_cert_cb(SSL *s, int (*cb) (SSL *ssl, void *arg), void *arg);
  # ifndef OPENSSL_NO_RSA
  __owur int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa);
  __owur int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, const unsigned char *d,
                                        long len);
  # endif
  __owur int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey);
  __owur int SSL_use_PrivateKey_ASN1(int pk, SSL *ssl, const unsigned char *d,
                                     long len);
  __owur int SSL_use_certificate(SSL *ssl, X509 *x);
  __owur int SSL_use_certificate_ASN1(SSL *ssl, const unsigned char *d, int len);
  __owur int SSL_use_cert_and_key(SSL *ssl, X509 *x509, EVP_PKEY *privatekey,
                                  STACK_OF(X509) *chain, int override);
  
  
  /* serverinfo file format versions */
  # define SSL_SERVERINFOV1   1
  # define SSL_SERVERINFOV2   2
  
  /* Set serverinfo data for the current active cert. */
  __owur int SSL_CTX_use_serverinfo(SSL_CTX *ctx, const unsigned char *serverinfo,
                                    size_t serverinfo_length);
  __owur int SSL_CTX_use_serverinfo_ex(SSL_CTX *ctx, unsigned int version,
                                       const unsigned char *serverinfo,
                                       size_t serverinfo_length);
  __owur int SSL_CTX_use_serverinfo_file(SSL_CTX *ctx, const char *file);
  
  #ifndef OPENSSL_NO_RSA
  __owur int SSL_use_RSAPrivateKey_file(SSL *ssl, const char *file, int type);
  #endif
  
  __owur int SSL_use_PrivateKey_file(SSL *ssl, const char *file, int type);
  __owur int SSL_use_certificate_file(SSL *ssl, const char *file, int type);
  
  #ifndef OPENSSL_NO_RSA
  __owur int SSL_CTX_use_RSAPrivateKey_file(SSL_CTX *ctx, const char *file,
                                            int type);
  #endif
  __owur int SSL_CTX_use_PrivateKey_file(SSL_CTX *ctx, const char *file,
                                         int type);
  __owur int SSL_CTX_use_certificate_file(SSL_CTX *ctx, const char *file,
                                          int type);
  /* PEM type */
  __owur int SSL_CTX_use_certificate_chain_file(SSL_CTX *ctx, const char *file);
  __owur int SSL_use_certificate_chain_file(SSL *ssl, const char *file);
  __owur STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file);
  __owur int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stackCAs,
                                                 const char *file);
  int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stackCAs,
                                         const char *dir);
  
  # if !OPENSSL_API_1_1_0
  #  define SSL_load_error_strings() \
      OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS \
                       | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL)
  # endif
  
  __owur const char *SSL_state_string(const SSL *s);
  __owur const char *SSL_rstate_string(const SSL *s);
  __owur const char *SSL_state_string_long(const SSL *s);
  __owur const char *SSL_rstate_string_long(const SSL *s);
  __owur long SSL_SESSION_get_time(const SSL_SESSION *s);
  __owur long SSL_SESSION_set_time(SSL_SESSION *s, long t);
  __owur long SSL_SESSION_get_timeout(const SSL_SESSION *s);
  __owur long SSL_SESSION_set_timeout(SSL_SESSION *s, long t);
  __owur int SSL_SESSION_get_protocol_version(const SSL_SESSION *s);
  __owur int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version);
  
  __owur const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s);
  __owur int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname);
  void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s,
                                      const unsigned char **alpn,
                                      size_t *len);
  __owur int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s,
                                            const unsigned char *alpn,
                                            size_t len);
  __owur const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s);
  __owur int SSL_SESSION_set_cipher(SSL_SESSION *s, const SSL_CIPHER *cipher);
  __owur int SSL_SESSION_has_ticket(const SSL_SESSION *s);
  __owur unsigned long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s);
  void SSL_SESSION_get0_ticket(const SSL_SESSION *s, const unsigned char **tick,
                               size_t *len);
  __owur uint32_t SSL_SESSION_get_max_early_data(const SSL_SESSION *s);
  __owur int SSL_SESSION_set_max_early_data(SSL_SESSION *s,
                                            uint32_t max_early_data);
  __owur int SSL_copy_session_id(SSL *to, const SSL *from);
  __owur X509 *SSL_SESSION_get0_peer(SSL_SESSION *s);
  __owur int SSL_SESSION_set1_id_context(SSL_SESSION *s,
                                         const unsigned char *sid_ctx,
                                         unsigned int sid_ctx_len);
  __owur int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
                                 unsigned int sid_len);
  __owur int SSL_SESSION_is_resumable(const SSL_SESSION *s);
  
  __owur SSL_SESSION *SSL_SESSION_new(void);
  __owur SSL_SESSION *SSL_SESSION_dup(SSL_SESSION *src);
  const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s,
                                          unsigned int *len);
  const unsigned char *SSL_SESSION_get0_id_context(const SSL_SESSION *s,
                                                   unsigned int *len);
  __owur unsigned int SSL_SESSION_get_compress_id(const SSL_SESSION *s);
  # ifndef OPENSSL_NO_STDIO
  int SSL_SESSION_print_fp(FILE *fp, const SSL_SESSION *ses);
  # endif
  int SSL_SESSION_print(BIO *fp, const SSL_SESSION *ses);
  int SSL_SESSION_print_keylog(BIO *bp, const SSL_SESSION *x);
  int SSL_SESSION_up_ref(SSL_SESSION *ses);
  void SSL_SESSION_free(SSL_SESSION *ses);
  __owur int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
  __owur int SSL_set_session(SSL *to, SSL_SESSION *session);
  int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *session);
  int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *session);
  __owur int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb);
  __owur int SSL_set_generate_session_id(SSL *s, GEN_SESSION_CB cb);
  __owur int SSL_has_matching_session_id(const SSL *s,
                                         const unsigned char *id,
                                         unsigned int id_len);
  SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
                               long length);
  
  # ifdef HEADER_X509_H
  __owur X509 *SSL_get_peer_certificate(const SSL *s);
  # endif
  
  __owur STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *s);
  
  __owur int SSL_CTX_get_verify_mode(const SSL_CTX *ctx);
  __owur int SSL_CTX_get_verify_depth(const SSL_CTX *ctx);
  __owur SSL_verify_cb SSL_CTX_get_verify_callback(const SSL_CTX *ctx);
  void SSL_CTX_set_verify(SSL_CTX *ctx, int mode, SSL_verify_cb callback);
  void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth);
  void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,
                                        int (*cb) (X509_STORE_CTX *, void *),
                                        void *arg);
  void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cb) (SSL *ssl, void *arg),
                           void *arg);
  # ifndef OPENSSL_NO_RSA
  __owur int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa);
  __owur int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const unsigned char *d,
                                            long len);
  # endif
  __owur int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey);
  __owur int SSL_CTX_use_PrivateKey_ASN1(int pk, SSL_CTX *ctx,
                                         const unsigned char *d, long len);
  __owur int SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x);
  __owur int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, int len,
                                          const unsigned char *d);
  __owur int SSL_CTX_use_cert_and_key(SSL_CTX *ctx, X509 *x509, EVP_PKEY *privatekey,
                                      STACK_OF(X509) *chain, int override);
  
  void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb);
  void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u);
  pem_password_cb *SSL_CTX_get_default_passwd_cb(SSL_CTX *ctx);
  void *SSL_CTX_get_default_passwd_cb_userdata(SSL_CTX *ctx);
  void SSL_set_default_passwd_cb(SSL *s, pem_password_cb *cb);
  void SSL_set_default_passwd_cb_userdata(SSL *s, void *u);
  pem_password_cb *SSL_get_default_passwd_cb(SSL *s);
  void *SSL_get_default_passwd_cb_userdata(SSL *s);
  
  __owur int SSL_CTX_check_private_key(const SSL_CTX *ctx);
  __owur int SSL_check_private_key(const SSL *ctx);
  
  __owur int SSL_CTX_set_session_id_context(SSL_CTX *ctx,
                                            const unsigned char *sid_ctx,
                                            unsigned int sid_ctx_len);
  
  SSL *SSL_new(SSL_CTX *ctx);
  int SSL_up_ref(SSL *s);
  int SSL_is_dtls(const SSL *s);
  __owur int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
                                        unsigned int sid_ctx_len);
  
  __owur int SSL_CTX_set_purpose(SSL_CTX *ctx, int purpose);
  __owur int SSL_set_purpose(SSL *ssl, int purpose);
  __owur int SSL_CTX_set_trust(SSL_CTX *ctx, int trust);
  __owur int SSL_set_trust(SSL *ssl, int trust);
  
  __owur int SSL_set1_host(SSL *s, const char *hostname);
  __owur int SSL_add1_host(SSL *s, const char *hostname);
  __owur const char *SSL_get0_peername(SSL *s);
  void SSL_set_hostflags(SSL *s, unsigned int flags);
  
  __owur int SSL_CTX_dane_enable(SSL_CTX *ctx);
  __owur int SSL_CTX_dane_mtype_set(SSL_CTX *ctx, const EVP_MD *md,
                                    uint8_t mtype, uint8_t ord);
  __owur int SSL_dane_enable(SSL *s, const char *basedomain);
  __owur int SSL_dane_tlsa_add(SSL *s, uint8_t usage, uint8_t selector,
                               uint8_t mtype, unsigned const char *data, size_t dlen);
  __owur int SSL_get0_dane_authority(SSL *s, X509 **mcert, EVP_PKEY **mspki);
  __owur int SSL_get0_dane_tlsa(SSL *s, uint8_t *usage, uint8_t *selector,
                                uint8_t *mtype, unsigned const char **data,
                                size_t *dlen);
  /*
   * Bridge opacity barrier between libcrypt and libssl, also needed to support
   * offline testing in test/danetest.c
   */
  SSL_DANE *SSL_get0_dane(SSL *ssl);
  /*
   * DANE flags
   */
  unsigned long SSL_CTX_dane_set_flags(SSL_CTX *ctx, unsigned long flags);
  unsigned long SSL_CTX_dane_clear_flags(SSL_CTX *ctx, unsigned long flags);
  unsigned long SSL_dane_set_flags(SSL *ssl, unsigned long flags);
  unsigned long SSL_dane_clear_flags(SSL *ssl, unsigned long flags);
  
  __owur int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm);
  __owur int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm);
  
  __owur X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx);
  __owur X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl);
  
  # ifndef OPENSSL_NO_SRP
  int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name);
  int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password);
  int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength);
  int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
                                          char *(*cb) (SSL *, void *));
  int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
                                            int (*cb) (SSL *, void *));
  int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
                                        int (*cb) (SSL *, int *, void *));
  int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg);
  
  int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
                               BIGNUM *sa, BIGNUM *v, char *info);
  int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
                                  const char *grp);
  
  __owur BIGNUM *SSL_get_srp_g(SSL *s);
  __owur BIGNUM *SSL_get_srp_N(SSL *s);
  
  __owur char *SSL_get_srp_username(SSL *s);
  __owur char *SSL_get_srp_userinfo(SSL *s);
  # endif
  
  /*
   * ClientHello callback and helpers.
   */
  
  # define SSL_CLIENT_HELLO_SUCCESS 1
  # define SSL_CLIENT_HELLO_ERROR   0
  # define SSL_CLIENT_HELLO_RETRY   (-1)
  
  typedef int (*SSL_client_hello_cb_fn) (SSL *s, int *al, void *arg);
  void SSL_CTX_set_client_hello_cb(SSL_CTX *c, SSL_client_hello_cb_fn cb,
                                   void *arg);
  int SSL_client_hello_isv2(SSL *s);
  unsigned int SSL_client_hello_get0_legacy_version(SSL *s);
  size_t SSL_client_hello_get0_random(SSL *s, const unsigned char **out);
  size_t SSL_client_hello_get0_session_id(SSL *s, const unsigned char **out);
  size_t SSL_client_hello_get0_ciphers(SSL *s, const unsigned char **out);
  size_t SSL_client_hello_get0_compression_methods(SSL *s,
                                                   const unsigned char **out);
  int SSL_client_hello_get1_extensions_present(SSL *s, int **out, size_t *outlen);
  int SSL_client_hello_get0_ext(SSL *s, unsigned int type,
                                const unsigned char **out, size_t *outlen);
  
  void SSL_certs_clear(SSL *s);
  void SSL_free(SSL *ssl);
  # ifdef OSSL_ASYNC_FD
  /*
   * Windows application developer has to include windows.h to use these.
   */
  __owur int SSL_waiting_for_async(SSL *s);
  __owur int SSL_get_all_async_fds(SSL *s, OSSL_ASYNC_FD *fds, size_t *numfds);
  __owur int SSL_get_changed_async_fds(SSL *s, OSSL_ASYNC_FD *addfd,
                                       size_t *numaddfds, OSSL_ASYNC_FD *delfd,
                                       size_t *numdelfds);
  __owur int SSL_CTX_set_async_callback(SSL_CTX *ctx, SSL_async_callback_fn callback);
  __owur int SSL_CTX_set_async_callback_arg(SSL_CTX *ctx, void *arg);
  __owur int SSL_set_async_callback(SSL *s, SSL_async_callback_fn callback);
  __owur int SSL_set_async_callback_arg(SSL *s, void *arg);
  __owur int SSL_get_async_status(SSL *s, int *status);
  
  # endif
  __owur int SSL_accept(SSL *ssl);
  __owur int SSL_stateless(SSL *s);
  __owur int SSL_connect(SSL *ssl);
  __owur int SSL_read(SSL *ssl, void *buf, int num);
  __owur int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);
  
  # define SSL_READ_EARLY_DATA_ERROR   0
  # define SSL_READ_EARLY_DATA_SUCCESS 1
  # define SSL_READ_EARLY_DATA_FINISH  2
  
  __owur int SSL_read_early_data(SSL *s, void *buf, size_t num,
                                 size_t *readbytes);
  __owur int SSL_peek(SSL *ssl, void *buf, int num);
  __owur int SSL_peek_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);
  __owur int SSL_write(SSL *ssl, const void *buf, int num);
  __owur int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);
  __owur int SSL_write_early_data(SSL *s, const void *buf, size_t num,
                                  size_t *written);
  long SSL_ctrl(SSL *ssl, int cmd, long larg, void *parg);
  long SSL_callback_ctrl(SSL *, int, void (*)(void));
  long SSL_CTX_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg);
  long SSL_CTX_callback_ctrl(SSL_CTX *, int, void (*)(void));
  
  # define SSL_EARLY_DATA_NOT_SENT    0
  # define SSL_EARLY_DATA_REJECTED    1
  # define SSL_EARLY_DATA_ACCEPTED    2
  
  __owur int SSL_get_early_data_status(const SSL *s);
  
  __owur int SSL_get_error(const SSL *s, int ret_code);
  __owur const char *SSL_get_version(const SSL *s);
  
  /* This sets the 'default' SSL version that SSL_new() will create */
  __owur int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth);
  
  # ifndef OPENSSL_NO_SSL3_METHOD
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *SSLv3_method(void)) /* SSLv3 */
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *SSLv3_server_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *SSLv3_client_method(void))
  # endif
  
  #define SSLv23_method           TLS_method
  #define SSLv23_server_method    TLS_server_method
  #define SSLv23_client_method    TLS_client_method
  
  /* Negotiate highest available SSL/TLS version */
  __owur const SSL_METHOD *TLS_method(void);
  __owur const SSL_METHOD *TLS_server_method(void);
  __owur const SSL_METHOD *TLS_client_method(void);
  
  # ifndef OPENSSL_NO_TLS1_METHOD
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_method(void)) /* TLSv1.0 */
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_server_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_client_method(void))
  # endif
  
  # ifndef OPENSSL_NO_TLS1_1_METHOD
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_1_method(void)) /* TLSv1.1 */
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_1_server_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_1_client_method(void))
  # endif
  
  # ifndef OPENSSL_NO_TLS1_2_METHOD
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_method(void)) /* TLSv1.2 */
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_server_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_client_method(void))
  # endif
  
  # ifndef OPENSSL_NO_DTLS1_METHOD
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_method(void)) /* DTLSv1.0 */
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_server_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_client_method(void))
  # endif
  
  # ifndef OPENSSL_NO_DTLS1_2_METHOD
  /* DTLSv1.2 */
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_2_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_2_server_method(void))
  DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *DTLSv1_2_client_method(void))
  # endif
  
  __owur const SSL_METHOD *DTLS_method(void); /* DTLS 1.0 and 1.2 */
  __owur const SSL_METHOD *DTLS_server_method(void); /* DTLS 1.0 and 1.2 */
  __owur const SSL_METHOD *DTLS_client_method(void); /* DTLS 1.0 and 1.2 */
  
  __owur size_t DTLS_get_data_mtu(const SSL *s);
  
  __owur STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *s);
  __owur STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx);
  __owur STACK_OF(SSL_CIPHER) *SSL_get_client_ciphers(const SSL *s);
  __owur STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s);
  
  __owur int SSL_do_handshake(SSL *s);
  int SSL_key_update(SSL *s, int updatetype);
  int SSL_get_key_update_type(const SSL *s);
  int SSL_renegotiate(SSL *s);
  int SSL_renegotiate_abbreviated(SSL *s);
  __owur int SSL_renegotiate_pending(const SSL *s);
  int SSL_shutdown(SSL *s);
  __owur int SSL_verify_client_post_handshake(SSL *s);
  void SSL_CTX_set_post_handshake_auth(SSL_CTX *ctx, int val);
  void SSL_set_post_handshake_auth(SSL *s, int val);
  
  __owur const SSL_METHOD *SSL_CTX_get_ssl_method(const SSL_CTX *ctx);
  __owur const SSL_METHOD *SSL_get_ssl_method(const SSL *s);
  __owur int SSL_set_ssl_method(SSL *s, const SSL_METHOD *method);
  __owur const char *SSL_alert_type_string_long(int value);
  __owur const char *SSL_alert_type_string(int value);
  __owur const char *SSL_alert_desc_string_long(int value);
  __owur const char *SSL_alert_desc_string(int value);
  
  void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list);
  void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list);
  __owur const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s);
  __owur const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx);
  __owur int SSL_add1_to_CA_list(SSL *ssl, const X509 *x);
  __owur int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x);
  __owur const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s);
  
  void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list);
  void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list);
  __owur STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s);
  __owur STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *s);
  __owur int SSL_add_client_CA(SSL *ssl, X509 *x);
  __owur int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x);
  
  void SSL_set_connect_state(SSL *s);
  void SSL_set_accept_state(SSL *s);
  
  __owur long SSL_get_default_timeout(const SSL *s);
  
  # if !OPENSSL_API_1_1_0
  #  define SSL_library_init() OPENSSL_init_ssl(0, NULL)
  # endif
  
  __owur char *SSL_CIPHER_description(const SSL_CIPHER *, char *buf, int size);
  __owur STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk);
  
  __owur SSL *SSL_dup(SSL *ssl);
  
  __owur X509 *SSL_get_certificate(const SSL *ssl);
  /*
   * EVP_PKEY
   */
  struct evp_pkey_st *SSL_get_privatekey(const SSL *ssl);
  
  __owur X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx);
  __owur EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx);
  
  void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode);
  __owur int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx);
  void SSL_set_quiet_shutdown(SSL *ssl, int mode);
  __owur int SSL_get_quiet_shutdown(const SSL *ssl);
  void SSL_set_shutdown(SSL *ssl, int mode);
  __owur int SSL_get_shutdown(const SSL *ssl);
  __owur int SSL_version(const SSL *ssl);
  __owur int SSL_client_version(const SSL *s);
  __owur int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx);
  __owur int SSL_CTX_set_default_verify_dir(SSL_CTX *ctx);
  __owur int SSL_CTX_set_default_verify_file(SSL_CTX *ctx);
  __owur int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                                           const char *CApath);
  # define SSL_get0_session SSL_get_session/* just peek at pointer */
  __owur SSL_SESSION *SSL_get_session(const SSL *ssl);
  __owur SSL_SESSION *SSL_get1_session(SSL *ssl); /* obtain a reference count */
  __owur SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl);
  SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX *ctx);
  void SSL_set_info_callback(SSL *ssl,
                             void (*cb) (const SSL *ssl, int type, int val));
  void (*SSL_get_info_callback(const SSL *ssl)) (const SSL *ssl, int type,
                                                 int val);
  __owur OSSL_HANDSHAKE_STATE SSL_get_state(const SSL *ssl);
  
  void SSL_set_verify_result(SSL *ssl, long v);
  __owur long SSL_get_verify_result(const SSL *ssl);
  __owur STACK_OF(X509) *SSL_get0_verified_chain(const SSL *s);
  
  __owur size_t SSL_get_client_random(const SSL *ssl, unsigned char *out,
                                      size_t outlen);
  __owur size_t SSL_get_server_random(const SSL *ssl, unsigned char *out,
                                      size_t outlen);
  __owur size_t SSL_SESSION_get_master_key(const SSL_SESSION *sess,
                                           unsigned char *out, size_t outlen);
  __owur int SSL_SESSION_set1_master_key(SSL_SESSION *sess,
                                         const unsigned char *in, size_t len);
  uint8_t SSL_SESSION_get_max_fragment_length(const SSL_SESSION *sess);
  
  #define SSL_get_ex_new_index(l, p, newf, dupf, freef) \
      CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL, l, p, newf, dupf, freef)
  __owur int SSL_set_ex_data(SSL *ssl, int idx, void *data);
  void *SSL_get_ex_data(const SSL *ssl, int idx);
  #define SSL_SESSION_get_ex_new_index(l, p, newf, dupf, freef) \
      CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, l, p, newf, dupf, freef)
  __owur int SSL_SESSION_set_ex_data(SSL_SESSION *ss, int idx, void *data);
  void *SSL_SESSION_get_ex_data(const SSL_SESSION *ss, int idx);
  #define SSL_CTX_get_ex_new_index(l, p, newf, dupf, freef) \
      CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_CTX, l, p, newf, dupf, freef)
  __owur int SSL_CTX_set_ex_data(SSL_CTX *ssl, int idx, void *data);
  void *SSL_CTX_get_ex_data(const SSL_CTX *ssl, int idx);
  
  __owur int SSL_get_ex_data_X509_STORE_CTX_idx(void);
  
  # define SSL_CTX_sess_set_cache_size(ctx,t) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_SESS_CACHE_SIZE,t,NULL)
  # define SSL_CTX_sess_get_cache_size(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_SESS_CACHE_SIZE,0,NULL)
  # define SSL_CTX_set_session_cache_mode(ctx,m) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_SESS_CACHE_MODE,m,NULL)
  # define SSL_CTX_get_session_cache_mode(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_SESS_CACHE_MODE,0,NULL)
  
  # define SSL_CTX_get_default_read_ahead(ctx) SSL_CTX_get_read_ahead(ctx)
  # define SSL_CTX_set_default_read_ahead(ctx,m) SSL_CTX_set_read_ahead(ctx,m)
  # define SSL_CTX_get_read_ahead(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_READ_AHEAD,0,NULL)
  # define SSL_CTX_set_read_ahead(ctx,m) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_READ_AHEAD,m,NULL)
  # define SSL_CTX_get_max_cert_list(ctx) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_GET_MAX_CERT_LIST,0,NULL)
  # define SSL_CTX_set_max_cert_list(ctx,m) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_MAX_CERT_LIST,m,NULL)
  # define SSL_get_max_cert_list(ssl) \
          SSL_ctrl(ssl,SSL_CTRL_GET_MAX_CERT_LIST,0,NULL)
  # define SSL_set_max_cert_list(ssl,m) \
          SSL_ctrl(ssl,SSL_CTRL_SET_MAX_CERT_LIST,m,NULL)
  
  # define SSL_CTX_set_max_send_fragment(ctx,m) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_MAX_SEND_FRAGMENT,m,NULL)
  # define SSL_set_max_send_fragment(ssl,m) \
          SSL_ctrl(ssl,SSL_CTRL_SET_MAX_SEND_FRAGMENT,m,NULL)
  # define SSL_CTX_set_split_send_fragment(ctx,m) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_SPLIT_SEND_FRAGMENT,m,NULL)
  # define SSL_set_split_send_fragment(ssl,m) \
          SSL_ctrl(ssl,SSL_CTRL_SET_SPLIT_SEND_FRAGMENT,m,NULL)
  # define SSL_CTX_set_max_pipelines(ctx,m) \
          SSL_CTX_ctrl(ctx,SSL_CTRL_SET_MAX_PIPELINES,m,NULL)
  # define SSL_set_max_pipelines(ssl,m) \
          SSL_ctrl(ssl,SSL_CTRL_SET_MAX_PIPELINES,m,NULL)
  
  void SSL_CTX_set_default_read_buffer_len(SSL_CTX *ctx, size_t len);
  void SSL_set_default_read_buffer_len(SSL *s, size_t len);
  
  # ifndef OPENSSL_NO_DH
  /* NB: the |keylength| is only applicable when is_export is true */
  void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,
                                   DH *(*dh) (SSL *ssl, int is_export,
                                              int keylength));
  void SSL_set_tmp_dh_callback(SSL *ssl,
                               DH *(*dh) (SSL *ssl, int is_export,
                                          int keylength));
  # endif
  
  __owur const COMP_METHOD *SSL_get_current_compression(const SSL *s);
  __owur const COMP_METHOD *SSL_get_current_expansion(const SSL *s);
  __owur const char *SSL_COMP_get_name(const COMP_METHOD *comp);
  __owur const char *SSL_COMP_get0_name(const SSL_COMP *comp);
  __owur int SSL_COMP_get_id(const SSL_COMP *comp);
  STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void);
  __owur STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP)
                                                               *meths);
  # if !OPENSSL_API_1_1_0
  #  define SSL_COMP_free_compression_methods() while(0) continue
  # endif
  __owur int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);
  
  const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr);
  int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c);
  int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c);
  int SSL_bytes_to_cipher_list(SSL *s, const unsigned char *bytes, size_t len,
                               int isv2format, STACK_OF(SSL_CIPHER) **sk,
                               STACK_OF(SSL_CIPHER) **scsvs);
  
  /* TLS extensions functions */
  __owur int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len);
  
  __owur int SSL_set_session_ticket_ext_cb(SSL *s,
                                           tls_session_ticket_ext_cb_fn cb,
                                           void *arg);
  
  /* Pre-shared secret session resumption functions */
  __owur int SSL_set_session_secret_cb(SSL *s,
                                       tls_session_secret_cb_fn session_secret_cb,
                                       void *arg);
  
  void SSL_CTX_set_not_resumable_session_callback(SSL_CTX *ctx,
                                                  int (*cb) (SSL *ssl,
                                                             int
                                                             is_forward_secure));
  
  void SSL_set_not_resumable_session_callback(SSL *ssl,
                                              int (*cb) (SSL *ssl,
                                                         int is_forward_secure));
  
  void SSL_CTX_set_record_padding_callback(SSL_CTX *ctx,
                                           size_t (*cb) (SSL *ssl, int type,
                                                         size_t len, void *arg));
  void SSL_CTX_set_record_padding_callback_arg(SSL_CTX *ctx, void *arg);
  void *SSL_CTX_get_record_padding_callback_arg(const SSL_CTX *ctx);
  int SSL_CTX_set_block_padding(SSL_CTX *ctx, size_t block_size);
  
  void SSL_set_record_padding_callback(SSL *ssl,
                                      size_t (*cb) (SSL *ssl, int type,
                                                    size_t len, void *arg));
  void SSL_set_record_padding_callback_arg(SSL *ssl, void *arg);
  void *SSL_get_record_padding_callback_arg(const SSL *ssl);
  int SSL_set_block_padding(SSL *ssl, size_t block_size);
  
  int SSL_set_num_tickets(SSL *s, size_t num_tickets);
  size_t SSL_get_num_tickets(const SSL *s);
  int SSL_CTX_set_num_tickets(SSL_CTX *ctx, size_t num_tickets);
  size_t SSL_CTX_get_num_tickets(const SSL_CTX *ctx);
  
  # if !OPENSSL_API_1_1_0
  #  define SSL_cache_hit(s) SSL_session_reused(s)
  # endif
  
  __owur int SSL_session_reused(SSL *s);
  __owur int SSL_is_server(const SSL *s);
  
  __owur __owur SSL_CONF_CTX *SSL_CONF_CTX_new(void);
  int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx);
  void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx);
  unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags);
  __owur unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx,
                                               unsigned int flags);
  __owur int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre);
  
  void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl);
  void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx);
  
  __owur int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value);
  __owur int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv);
  __owur int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd);
  
  void SSL_add_ssl_module(void);
  int SSL_config(SSL *s, const char *name);
  int SSL_CTX_config(SSL_CTX *ctx, const char *name);
  
  # ifndef OPENSSL_NO_SSL_TRACE
  void SSL_trace(int write_p, int version, int content_type,
                 const void *buf, size_t len, SSL *ssl, void *arg);
  # endif
  
  # ifndef OPENSSL_NO_SOCK
  int DTLSv1_listen(SSL *s, BIO_ADDR *client);
  # endif
  
  # ifndef OPENSSL_NO_CT
  
  /*
   * A callback for verifying that the received SCTs are sufficient.
   * Expected to return 1 if they are sufficient, otherwise 0.
   * May return a negative integer if an error occurs.
   * A connection should be aborted if the SCTs are deemed insufficient.
   */
  typedef int (*ssl_ct_validation_cb)(const CT_POLICY_EVAL_CTX *ctx,
                                      const STACK_OF(SCT) *scts, void *arg);
  
  /*
   * Sets a |callback| that is invoked upon receipt of ServerHelloDone to validate
   * the received SCTs.
   * If the callback returns a non-positive result, the connection is terminated.
   * Call this function before beginning a handshake.
   * If a NULL |callback| is provided, SCT validation is disabled.
   * |arg| is arbitrary userdata that will be passed to the callback whenever it
   * is invoked. Ownership of |arg| remains with the caller.
   *
   * NOTE: A side-effect of setting a CT callback is that an OCSP stapled response
   *       will be requested.
   */
  int SSL_set_ct_validation_callback(SSL *s, ssl_ct_validation_cb callback,
                                     void *arg);
  int SSL_CTX_set_ct_validation_callback(SSL_CTX *ctx,
                                         ssl_ct_validation_cb callback,
                                         void *arg);
  #define SSL_disable_ct(s) \
          ((void) SSL_set_validation_callback((s), NULL, NULL))
  #define SSL_CTX_disable_ct(ctx) \
          ((void) SSL_CTX_set_validation_callback((ctx), NULL, NULL))
  
  /*
   * The validation type enumerates the available behaviours of the built-in SSL
   * CT validation callback selected via SSL_enable_ct() and SSL_CTX_enable_ct().
   * The underlying callback is a static function in libssl.
   */
  enum {
      SSL_CT_VALIDATION_PERMISSIVE = 0,
      SSL_CT_VALIDATION_STRICT
  };
  
  /*
   * Enable CT by setting up a callback that implements one of the built-in
   * validation variants.  The SSL_CT_VALIDATION_PERMISSIVE variant always
   * continues the handshake, the application can make appropriate decisions at
   * handshake completion.  The SSL_CT_VALIDATION_STRICT variant requires at
   * least one valid SCT, or else handshake termination will be requested.  The
   * handshake may continue anyway if SSL_VERIFY_NONE is in effect.
   */
  int SSL_enable_ct(SSL *s, int validation_mode);
  int SSL_CTX_enable_ct(SSL_CTX *ctx, int validation_mode);
  
  /*
   * Report whether a non-NULL callback is enabled.
   */
  int SSL_ct_is_enabled(const SSL *s);
  int SSL_CTX_ct_is_enabled(const SSL_CTX *ctx);
  
  /* Gets the SCTs received from a connection */
  const STACK_OF(SCT) *SSL_get0_peer_scts(SSL *s);
  
  /*
   * Loads the CT log list from the default location.
   * If a CTLOG_STORE has previously been set using SSL_CTX_set_ctlog_store,
   * the log information loaded from this file will be appended to the
   * CTLOG_STORE.
   * Returns 1 on success, 0 otherwise.
   */
  int SSL_CTX_set_default_ctlog_list_file(SSL_CTX *ctx);
  
  /*
   * Loads the CT log list from the specified file path.
   * If a CTLOG_STORE has previously been set using SSL_CTX_set_ctlog_store,
   * the log information loaded from this file will be appended to the
   * CTLOG_STORE.
   * Returns 1 on success, 0 otherwise.
   */
  int SSL_CTX_set_ctlog_list_file(SSL_CTX *ctx, const char *path);
  
  /*
   * Sets the CT log list used by all SSL connections created from this SSL_CTX.
   * Ownership of the CTLOG_STORE is transferred to the SSL_CTX.
   */
  void SSL_CTX_set0_ctlog_store(SSL_CTX *ctx, CTLOG_STORE *logs);
  
  /*
   * Gets the CT log list used by all SSL connections created from this SSL_CTX.
   * This will be NULL unless one of the following functions has been called:
   * - SSL_CTX_set_default_ctlog_list_file
   * - SSL_CTX_set_ctlog_list_file
   * - SSL_CTX_set_ctlog_store
   */
  const CTLOG_STORE *SSL_CTX_get0_ctlog_store(const SSL_CTX *ctx);
  
  # endif /* OPENSSL_NO_CT */
  
  /* What the "other" parameter contains in security callback */
  /* Mask for type */
  # define SSL_SECOP_OTHER_TYPE    0xffff0000
  # define SSL_SECOP_OTHER_NONE    0
  # define SSL_SECOP_OTHER_CIPHER  (1 << 16)
  # define SSL_SECOP_OTHER_CURVE   (2 << 16)
  # define SSL_SECOP_OTHER_DH      (3 << 16)
  # define SSL_SECOP_OTHER_PKEY    (4 << 16)
  # define SSL_SECOP_OTHER_SIGALG  (5 << 16)
  # define SSL_SECOP_OTHER_CERT    (6 << 16)
  
  /* Indicated operation refers to peer key or certificate */
  # define SSL_SECOP_PEER          0x1000
  
  /* Values for "op" parameter in security callback */
  
  /* Called to filter ciphers */
  /* Ciphers client supports */
  # define SSL_SECOP_CIPHER_SUPPORTED      (1 | SSL_SECOP_OTHER_CIPHER)
  /* Cipher shared by client/server */
  # define SSL_SECOP_CIPHER_SHARED         (2 | SSL_SECOP_OTHER_CIPHER)
  /* Sanity check of cipher server selects */
  # define SSL_SECOP_CIPHER_CHECK          (3 | SSL_SECOP_OTHER_CIPHER)
  /* Curves supported by client */
  # define SSL_SECOP_CURVE_SUPPORTED       (4 | SSL_SECOP_OTHER_CURVE)
  /* Curves shared by client/server */
  # define SSL_SECOP_CURVE_SHARED          (5 | SSL_SECOP_OTHER_CURVE)
  /* Sanity check of curve server selects */
  # define SSL_SECOP_CURVE_CHECK           (6 | SSL_SECOP_OTHER_CURVE)
  /* Temporary DH key */
  # define SSL_SECOP_TMP_DH                (7 | SSL_SECOP_OTHER_PKEY)
  /* SSL/TLS version */
  # define SSL_SECOP_VERSION               (9 | SSL_SECOP_OTHER_NONE)
  /* Session tickets */
  # define SSL_SECOP_TICKET                (10 | SSL_SECOP_OTHER_NONE)
  /* Supported signature algorithms sent to peer */
  # define SSL_SECOP_SIGALG_SUPPORTED      (11 | SSL_SECOP_OTHER_SIGALG)
  /* Shared signature algorithm */
  # define SSL_SECOP_SIGALG_SHARED         (12 | SSL_SECOP_OTHER_SIGALG)
  /* Sanity check signature algorithm allowed */
  # define SSL_SECOP_SIGALG_CHECK          (13 | SSL_SECOP_OTHER_SIGALG)
  /* Used to get mask of supported public key signature algorithms */
  # define SSL_SECOP_SIGALG_MASK           (14 | SSL_SECOP_OTHER_SIGALG)
  /* Use to see if compression is allowed */
  # define SSL_SECOP_COMPRESSION           (15 | SSL_SECOP_OTHER_NONE)
  /* EE key in certificate */
  # define SSL_SECOP_EE_KEY                (16 | SSL_SECOP_OTHER_CERT)
  /* CA key in certificate */
  # define SSL_SECOP_CA_KEY                (17 | SSL_SECOP_OTHER_CERT)
  /* CA digest algorithm in certificate */
  # define SSL_SECOP_CA_MD                 (18 | SSL_SECOP_OTHER_CERT)
  /* Peer EE key in certificate */
  # define SSL_SECOP_PEER_EE_KEY           (SSL_SECOP_EE_KEY | SSL_SECOP_PEER)
  /* Peer CA key in certificate */
  # define SSL_SECOP_PEER_CA_KEY           (SSL_SECOP_CA_KEY | SSL_SECOP_PEER)
  /* Peer CA digest algorithm in certificate */
  # define SSL_SECOP_PEER_CA_MD            (SSL_SECOP_CA_MD | SSL_SECOP_PEER)
  
  void SSL_set_security_level(SSL *s, int level);
  __owur int SSL_get_security_level(const SSL *s);
  void SSL_set_security_callback(SSL *s,
                                 int (*cb) (const SSL *s, const SSL_CTX *ctx,
                                            int op, int bits, int nid,
                                            void *other, void *ex));
  int (*SSL_get_security_callback(const SSL *s)) (const SSL *s,
                                                  const SSL_CTX *ctx, int op,
                                                  int bits, int nid, void *other,
                                                  void *ex);
  void SSL_set0_security_ex_data(SSL *s, void *ex);
  __owur void *SSL_get0_security_ex_data(const SSL *s);
  
  void SSL_CTX_set_security_level(SSL_CTX *ctx, int level);
  __owur int SSL_CTX_get_security_level(const SSL_CTX *ctx);
  void SSL_CTX_set_security_callback(SSL_CTX *ctx,
                                     int (*cb) (const SSL *s, const SSL_CTX *ctx,
                                                int op, int bits, int nid,
                                                void *other, void *ex));
  int (*SSL_CTX_get_security_callback(const SSL_CTX *ctx)) (const SSL *s,
                                                            const SSL_CTX *ctx,
                                                            int op, int bits,
                                                            int nid,
                                                            void *other,
                                                            void *ex);
  void SSL_CTX_set0_security_ex_data(SSL_CTX *ctx, void *ex);
  __owur void *SSL_CTX_get0_security_ex_data(const SSL_CTX *ctx);
  
  /* OPENSSL_INIT flag 0x010000 reserved for internal use */
  # define OPENSSL_INIT_NO_LOAD_SSL_STRINGS    0x00100000L
  # define OPENSSL_INIT_LOAD_SSL_STRINGS       0x00200000L
  
  # define OPENSSL_INIT_SSL_DEFAULT \
          (OPENSSL_INIT_LOAD_SSL_STRINGS | OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
  
  int OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings);
  
  # ifndef OPENSSL_NO_UNIT_TEST
  __owur const struct openssl_ssl_test_functions *SSL_test_functions(void);
  # endif
  
  __owur int SSL_free_buffers(SSL *ssl);
  __owur int SSL_alloc_buffers(SSL *ssl);
  
  /* Status codes passed to the decrypt session ticket callback. Some of these
   * are for internal use only and are never passed to the callback. */
  typedef int SSL_TICKET_STATUS;
  
  /* Support for ticket appdata */
  /* fatal error, malloc failure */
  # define SSL_TICKET_FATAL_ERR_MALLOC 0
  /* fatal error, either from parsing or decrypting the ticket */
  # define SSL_TICKET_FATAL_ERR_OTHER  1
  /* No ticket present */
  # define SSL_TICKET_NONE             2
  /* Empty ticket present */
  # define SSL_TICKET_EMPTY            3
  /* the ticket couldn't be decrypted */
  # define SSL_TICKET_NO_DECRYPT       4
  /* a ticket was successfully decrypted */
  # define SSL_TICKET_SUCCESS          5
  /* same as above but the ticket needs to be renewed */
  # define SSL_TICKET_SUCCESS_RENEW    6
  
  /* Return codes for the decrypt session ticket callback */
  typedef int SSL_TICKET_RETURN;
  
  /* An error occurred */
  #define SSL_TICKET_RETURN_ABORT             0
  /* Do not use the ticket, do not send a renewed ticket to the client */
  #define SSL_TICKET_RETURN_IGNORE            1
  /* Do not use the ticket, send a renewed ticket to the client */
  #define SSL_TICKET_RETURN_IGNORE_RENEW      2
  /* Use the ticket, do not send a renewed ticket to the client */
  #define SSL_TICKET_RETURN_USE               3
  /* Use the ticket, send a renewed ticket to the client */
  #define SSL_TICKET_RETURN_USE_RENEW         4
  
  typedef int (*SSL_CTX_generate_session_ticket_fn)(SSL *s, void *arg);
  typedef SSL_TICKET_RETURN (*SSL_CTX_decrypt_session_ticket_fn)(SSL *s, SSL_SESSION *ss,
                                                                 const unsigned char *keyname,
                                                                 size_t keyname_length,
                                                                 SSL_TICKET_STATUS status,
                                                                 void *arg);
  int SSL_CTX_set_session_ticket_cb(SSL_CTX *ctx,
                                    SSL_CTX_generate_session_ticket_fn gen_cb,
                                    SSL_CTX_decrypt_session_ticket_fn dec_cb,
                                    void *arg);
  int SSL_SESSION_set1_ticket_appdata(SSL_SESSION *ss, const void *data, size_t len);
  int SSL_SESSION_get0_ticket_appdata(SSL_SESSION *ss, void **data, size_t *len);
  
  typedef unsigned int (*DTLS_timer_cb)(SSL *s, unsigned int timer_us);
  
  void DTLS_set_timer_cb(SSL *s, DTLS_timer_cb cb);
  
  
  typedef int (*SSL_allow_early_data_cb_fn)(SSL *s, void *arg);
  void SSL_CTX_set_allow_early_data_cb(SSL_CTX *ctx,
                                       SSL_allow_early_data_cb_fn cb,
                                       void *arg);
  void SSL_set_allow_early_data_cb(SSL *s,
                                   SSL_allow_early_data_cb_fn cb,
                                   void *arg);
  
  # ifdef  __cplusplus
  }
  # endif
  #endif
  