text: /*
   * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (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
   */
  
  /* ====================================================================
   * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
   * ECC cipher suite support in OpenSSL originally developed by
   * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
   */
  /* ====================================================================
   * Copyright 2005 Nokia. All rights reserved.
   *
   * The portions of the attached software ("Contribution") is developed by
   * Nokia Corporation and is licensed pursuant to the OpenSSL open source
   * license.
   *
   * The Contribution, originally written by Mika Kousa and Pasi Eronen of
   * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
   * support (see RFC 4279) to OpenSSL.
   *
   * No patent licenses or other rights except those expressly stated in
   * the OpenSSL open source license shall be deemed granted or received
   * expressly, by implication, estoppel, or otherwise.
   *
   * No assurances are provided by Nokia that the Contribution does not
   * infringe the patent or other intellectual property rights of any third
   * party or that the license provides you with all the necessary rights
   * to make use of the Contribution.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
   * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
   * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
   * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
   * OTHERWISE.
   */
  
  #include <assert.h>
  #include <stdio.h>
  #include "ssl_locl.h"
  #include <openssl/objects.h>
  #include <openssl/lhash.h>
  #include <openssl/x509v3.h>
  #include <openssl/rand.h>
  #include <openssl/ocsp.h>
  #include <openssl/dh.h>
  #include <openssl/engine.h>
  #include <openssl/async.h>
  #include <openssl/ct.h>
  
  const char SSL_version_str[] = OPENSSL_VERSION_TEXT;
  
  SSL3_ENC_METHOD ssl3_undef_enc_method = {
      /*
       * evil casts, but these functions are only called if there's a library
       * bug
       */
      (int (*)(SSL *, SSL3_RECORD *, unsigned int, int))ssl_undefined_function,
      (int (*)(SSL *, SSL3_RECORD *, unsigned char *, int))ssl_undefined_function,
      ssl_undefined_function,
      (int (*)(SSL *, unsigned char *, unsigned char *, int))
          ssl_undefined_function,
      (int (*)(SSL *, int))ssl_undefined_function,
      (int (*)(SSL *, const char *, int, unsigned char *))
          ssl_undefined_function,
      0,                          /* finish_mac_length */
      NULL,                       /* client_finished_label */
      0,                          /* client_finished_label_len */
      NULL,                       /* server_finished_label */
      0,                          /* server_finished_label_len */
      (int (*)(int))ssl_undefined_function,
      (int (*)(SSL *, unsigned char *, size_t, const char *,
               size_t, const unsigned char *, size_t,
               int use_context))ssl_undefined_function,
  };
  
  struct ssl_async_args {
      SSL *s;
      void *buf;
      int num;
      enum { READFUNC, WRITEFUNC,  OTHERFUNC} type;
      union {
          int (*func_read)(SSL *, void *, int);
          int (*func_write)(SSL *, const void *, int);
          int (*func_other)(SSL *);
      } f;
  };
  
  static const struct {
      uint8_t mtype;
      uint8_t ord;
      int     nid;
  } dane_mds[] = {
      { DANETLS_MATCHING_FULL, 0, NID_undef },
      { DANETLS_MATCHING_2256, 1, NID_sha256 },
      { DANETLS_MATCHING_2512, 2, NID_sha512 },
  };
  
  static int dane_ctx_enable(struct dane_ctx_st *dctx)
  {
      const EVP_MD **mdevp;
      uint8_t *mdord;
      uint8_t mdmax = DANETLS_MATCHING_LAST;
      int n = ((int) mdmax) + 1;          /* int to handle PrivMatch(255) */
      size_t i;
  
      mdevp = OPENSSL_zalloc(n * sizeof(*mdevp));
      mdord = OPENSSL_zalloc(n * sizeof(*mdord));
  
      if (mdord == NULL || mdevp == NULL) {
          OPENSSL_free(mdord);
          OPENSSL_free(mdevp);
          SSLerr(SSL_F_DANE_CTX_ENABLE, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      /* Install default entries */
      for (i = 0; i < OSSL_NELEM(dane_mds); ++i) {
          const EVP_MD *md;
  
          if (dane_mds[i].nid == NID_undef ||
              (md = EVP_get_digestbynid(dane_mds[i].nid)) == NULL)
              continue;
          mdevp[dane_mds[i].mtype] = md;
          mdord[dane_mds[i].mtype] = dane_mds[i].ord;
      }
  
      dctx->mdevp = mdevp;
      dctx->mdord = mdord;
      dctx->mdmax = mdmax;
  
      return 1;
  }
  
  static void dane_ctx_final(struct dane_ctx_st *dctx)
  {
      OPENSSL_free(dctx->mdevp);
      dctx->mdevp = NULL;
  
      OPENSSL_free(dctx->mdord);
      dctx->mdord = NULL;
      dctx->mdmax = 0;
  }
  
  static void tlsa_free(danetls_record *t)
  {
      if (t == NULL)
          return;
      OPENSSL_free(t->data);
      EVP_PKEY_free(t->spki);
      OPENSSL_free(t);
  }
  
  static void dane_final(SSL_DANE *dane)
  {
      sk_danetls_record_pop_free(dane->trecs, tlsa_free);
      dane->trecs = NULL;
  
      sk_X509_pop_free(dane->certs, X509_free);
      dane->certs = NULL;
  
      X509_free(dane->mcert);
      dane->mcert = NULL;
      dane->mtlsa = NULL;
      dane->mdpth = -1;
      dane->pdpth = -1;
  }
  
  /*
   * dane_copy - Copy dane configuration, sans verification state.
   */
  static int ssl_dane_dup(SSL *to, SSL *from)
  {
      int num;
      int i;
  
      if (!DANETLS_ENABLED(&from->dane))
          return 1;
  
      dane_final(&to->dane);
      to->dane.dctx = &to->ctx->dane;
      to->dane.trecs = sk_danetls_record_new_null();
  
      if (to->dane.trecs == NULL) {
          SSLerr(SSL_F_SSL_DANE_DUP, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      num  = sk_danetls_record_num(from->dane.trecs);
      for (i = 0; i < num; ++i) {
          danetls_record *t = sk_danetls_record_value(from->dane.trecs, i);
  
          if (SSL_dane_tlsa_add(to, t->usage, t->selector, t->mtype,
                                t->data, t->dlen) <= 0)
              return 0;
      }
      return 1;
  }
  
  static int dane_mtype_set(
      struct dane_ctx_st *dctx,
      const EVP_MD *md,
      uint8_t mtype,
      uint8_t ord)
  {
      int i;
  
      if (mtype == DANETLS_MATCHING_FULL && md != NULL) {
          SSLerr(SSL_F_DANE_MTYPE_SET,
                  SSL_R_DANE_CANNOT_OVERRIDE_MTYPE_FULL);
          return 0;
      }
  
      if (mtype > dctx->mdmax) {
          const EVP_MD **mdevp;
          uint8_t *mdord;
          int n = ((int) mtype) + 1;
  
          mdevp = OPENSSL_realloc(dctx->mdevp, n * sizeof(*mdevp));
          if (mdevp == NULL) {
              SSLerr(SSL_F_DANE_MTYPE_SET, ERR_R_MALLOC_FAILURE);
              return -1;
          }
          dctx->mdevp = mdevp;
  
          mdord = OPENSSL_realloc(dctx->mdord, n * sizeof(*mdord));
          if (mdord == NULL) {
              SSLerr(SSL_F_DANE_MTYPE_SET, ERR_R_MALLOC_FAILURE);
              return -1;
          }
          dctx->mdord = mdord;
  
          /* Zero-fill any gaps */
          for (i = dctx->mdmax+1; i < mtype; ++i) {
              mdevp[i] = NULL;
              mdord[i] = 0;
          }
  
          dctx->mdmax = mtype;
      }
  
      dctx->mdevp[mtype] = md;
      /* Coerce ordinal of disabled matching types to 0 */
      dctx->mdord[mtype] = (md == NULL) ? 0 : ord;
  
      return 1;
  }
  
  static const EVP_MD *tlsa_md_get(SSL_DANE *dane, uint8_t mtype)
  {
      if (mtype > dane->dctx->mdmax)
          return NULL;
      return dane->dctx->mdevp[mtype];
  }
  
  static int dane_tlsa_add(
      SSL_DANE *dane,
      uint8_t usage,
      uint8_t selector,
      uint8_t mtype,
      unsigned char *data,
      size_t dlen)
  {
      danetls_record *t;
      const EVP_MD *md = NULL;
      int ilen = (int)dlen;
      int i;
      int num;
  
      if (dane->trecs == NULL) {
          SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_NOT_ENABLED);
          return -1;
      }
  
      if (ilen < 0 || dlen != (size_t)ilen) {
          SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_DATA_LENGTH);
          return 0;
      }
  
      if (usage > DANETLS_USAGE_LAST) {
          SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_CERTIFICATE_USAGE);
          return 0;
      }
  
      if (selector > DANETLS_SELECTOR_LAST) {
          SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_SELECTOR);
          return 0;
      }
  
      if (mtype != DANETLS_MATCHING_FULL) {
          md = tlsa_md_get(dane, mtype);
          if (md == NULL) {
              SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_MATCHING_TYPE);
              return 0;
          }
      }
  
      if (md != NULL && dlen != (size_t)EVP_MD_size(md)) {
          SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_DIGEST_LENGTH);
          return 0;
      }
      if (!data) {
          SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_NULL_DATA);
          return 0;
      }
  
      if ((t = OPENSSL_zalloc(sizeof(*t))) == NULL) {
          SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
          return -1;
      }
  
      t->usage = usage;
      t->selector = selector;
      t->mtype = mtype;
      t->data = OPENSSL_malloc(ilen);
      if (t->data == NULL) {
          tlsa_free(t);
          SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
          return -1;
      }
      memcpy(t->data, data, ilen);
      t->dlen = ilen;
  
      /* Validate and cache full certificate or public key */
      if (mtype == DANETLS_MATCHING_FULL) {
          const unsigned char *p = data;
          X509 *cert = NULL;
          EVP_PKEY *pkey = NULL;
  
          switch (selector) {
          case DANETLS_SELECTOR_CERT:
              if (!d2i_X509(&cert, &p, dlen) || p < data ||
                  dlen != (size_t)(p - data)) {
                  tlsa_free(t);
                  SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_CERTIFICATE);
                  return 0;
              }
              if (X509_get0_pubkey(cert) == NULL) {
                  tlsa_free(t);
                  SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_CERTIFICATE);
                  return 0;
              }
  
              if ((DANETLS_USAGE_BIT(usage) & DANETLS_TA_MASK) == 0) {
                  X509_free(cert);
                  break;
              }
  
              /*
               * For usage DANE-TA(2), we support authentication via "2 0 0" TLSA
               * records that contain full certificates of trust-anchors that are
               * not present in the wire chain.  For usage PKIX-TA(0), we augment
               * the chain with untrusted Full(0) certificates from DNS, in case
               * they are missing from the chain.
               */
              if ((dane->certs == NULL &&
                   (dane->certs = sk_X509_new_null()) == NULL) ||
                  !sk_X509_push(dane->certs, cert)) {
                  SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
                  X509_free(cert);
                  tlsa_free(t);
                  return -1;
              }
              break;
  
          case DANETLS_SELECTOR_SPKI:
              if (!d2i_PUBKEY(&pkey, &p, dlen) || p < data ||
                  dlen != (size_t)(p - data)) {
                  tlsa_free(t);
                  SSLerr(SSL_F_DANE_TLSA_ADD, SSL_R_DANE_TLSA_BAD_PUBLIC_KEY);
                  return 0;
              }
  
              /*
               * For usage DANE-TA(2), we support authentication via "2 1 0" TLSA
               * records that contain full bare keys of trust-anchors that are
               * not present in the wire chain.
               */
              if (usage == DANETLS_USAGE_DANE_TA)
                  t->spki = pkey;
              else
                  EVP_PKEY_free(pkey);
              break;
          }
      }
  
      /*-
       * Find the right insertion point for the new record.
       *
       * See crypto/x509/x509_vfy.c.  We sort DANE-EE(3) records first, so that
       * they can be processed first, as they require no chain building, and no
       * expiration or hostname checks.  Because DANE-EE(3) is numerically
       * largest, this is accomplished via descending sort by "usage".
       *
       * We also sort in descending order by matching ordinal to simplify
       * the implementation of digest agility in the verification code.
       *
       * The choice of order for the selector is not significant, so we
       * use the same descending order for consistency.
       */
      num = sk_danetls_record_num(dane->trecs);
      for (i = 0; i < num; ++i) {
          danetls_record *rec = sk_danetls_record_value(dane->trecs, i);
  
          if (rec->usage > usage)
              continue;
          if (rec->usage < usage)
              break;
          if (rec->selector > selector)
              continue;
          if (rec->selector < selector)
              break;
          if (dane->dctx->mdord[rec->mtype] > dane->dctx->mdord[mtype])
              continue;
          break;
      }
  
      if (!sk_danetls_record_insert(dane->trecs, t, i)) {
          tlsa_free(t);
          SSLerr(SSL_F_DANE_TLSA_ADD, ERR_R_MALLOC_FAILURE);
          return -1;
      }
      dane->umask |= DANETLS_USAGE_BIT(usage);
  
      return 1;
  }
  
  static void clear_ciphers(SSL *s)
  {
      /* clear the current cipher */
      ssl_clear_cipher_ctx(s);
      ssl_clear_hash_ctx(&s->read_hash);
      ssl_clear_hash_ctx(&s->write_hash);
  }
  
  int SSL_clear(SSL *s)
  {
      if (s->method == NULL) {
          SSLerr(SSL_F_SSL_CLEAR, SSL_R_NO_METHOD_SPECIFIED);
          return (0);
      }
  
      if (ssl_clear_bad_session(s)) {
          SSL_SESSION_free(s->session);
          s->session = NULL;
      }
  
      s->error = 0;
      s->hit = 0;
      s->shutdown = 0;
  
      if (s->renegotiate) {
          SSLerr(SSL_F_SSL_CLEAR, ERR_R_INTERNAL_ERROR);
          return 0;
      }
  
      ossl_statem_clear(s);
  
      s->version = s->method->version;
      s->client_version = s->version;
      s->rwstate = SSL_NOTHING;
  
      BUF_MEM_free(s->init_buf);
      s->init_buf = NULL;
      clear_ciphers(s);
      s->first_packet = 0;
  
      /* Reset DANE verification result state */
      s->dane.mdpth = -1;
      s->dane.pdpth = -1;
      X509_free(s->dane.mcert);
      s->dane.mcert = NULL;
      s->dane.mtlsa = NULL;
  
      /* Clear the verification result peername */
      X509_VERIFY_PARAM_move_peername(s->param, NULL);
  
      /*
       * Check to see if we were changed into a different method, if so, revert
       * back if we are not doing session-id reuse.
       */
      if (!ossl_statem_get_in_handshake(s) && (s->session == NULL)
          && (s->method != s->ctx->method)) {
          s->method->ssl_free(s);
          s->method = s->ctx->method;
          if (!s->method->ssl_new(s))
              return (0);
      } else
          s->method->ssl_clear(s);
  
      RECORD_LAYER_clear(&s->rlayer);
  
      return (1);
  }
  
  /** Used to change an SSL_CTXs default SSL method type */
  int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth)
  {
      STACK_OF(SSL_CIPHER) *sk;
  
      ctx->method = meth;
  
      sk = ssl_create_cipher_list(ctx->method, &(ctx->cipher_list),
                                  &(ctx->cipher_list_by_id),
                                  SSL_DEFAULT_CIPHER_LIST, ctx->cert);
      if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0)) {
          SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,
                 SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
          return (0);
      }
      return (1);
  }
  
  SSL *SSL_new(SSL_CTX *ctx)
  {
      SSL *s;
  
      if (ctx == NULL) {
          SSLerr(SSL_F_SSL_NEW, SSL_R_NULL_SSL_CTX);
          return (NULL);
      }
      if (ctx->method == NULL) {
          SSLerr(SSL_F_SSL_NEW, SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
          return (NULL);
      }
  
      s = OPENSSL_zalloc(sizeof(*s));
      if (s == NULL)
          goto err;
  
      s->lock = CRYPTO_THREAD_lock_new();
      if (s->lock == NULL) {
          SSLerr(SSL_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
          OPENSSL_free(s);
          return NULL;
      }
  
      RECORD_LAYER_init(&s->rlayer, s);
  
      s->options = ctx->options;
      s->min_proto_version = ctx->min_proto_version;
      s->max_proto_version = ctx->max_proto_version;
      s->mode = ctx->mode;
      s->max_cert_list = ctx->max_cert_list;
      s->references = 1;
  
      /*
       * Earlier library versions used to copy the pointer to the CERT, not
       * its contents; only when setting new parameters for the per-SSL
       * copy, ssl_cert_new would be called (and the direct reference to
       * the per-SSL_CTX settings would be lost, but those still were
       * indirectly accessed for various purposes, and for that reason they
       * used to be known as s->ctx->default_cert). Now we don't look at the
       * SSL_CTX's CERT after having duplicated it once.
       */
      s->cert = ssl_cert_dup(ctx->cert);
      if (s->cert == NULL)
          goto err;
  
      RECORD_LAYER_set_read_ahead(&s->rlayer, ctx->read_ahead);
      s->msg_callback = ctx->msg_callback;
      s->msg_callback_arg = ctx->msg_callback_arg;
      s->verify_mode = ctx->verify_mode;
      s->not_resumable_session_cb = ctx->not_resumable_session_cb;
      s->sid_ctx_length = ctx->sid_ctx_length;
      OPENSSL_assert(s->sid_ctx_length <= sizeof s->sid_ctx);
      memcpy(&s->sid_ctx, &ctx->sid_ctx, sizeof(s->sid_ctx));
      s->verify_callback = ctx->default_verify_callback;
      s->generate_session_id = ctx->generate_session_id;
  
      s->param = X509_VERIFY_PARAM_new();
      if (s->param == NULL)
          goto err;
      X509_VERIFY_PARAM_inherit(s->param, ctx->param);
      s->quiet_shutdown = ctx->quiet_shutdown;
      s->max_send_fragment = ctx->max_send_fragment;
      s->split_send_fragment = ctx->split_send_fragment;
      s->max_pipelines = ctx->max_pipelines;
      if (s->max_pipelines > 1)
          RECORD_LAYER_set_read_ahead(&s->rlayer, 1);
      if (ctx->default_read_buf_len > 0)
          SSL_set_default_read_buffer_len(s, ctx->default_read_buf_len);
  
      SSL_CTX_up_ref(ctx);
      s->ctx = ctx;
      s->tlsext_debug_cb = 0;
      s->tlsext_debug_arg = NULL;
      s->tlsext_ticket_expected = 0;
      s->tlsext_status_type = ctx->tlsext_status_type;
      s->tlsext_status_expected = 0;
      s->tlsext_ocsp_ids = NULL;
      s->tlsext_ocsp_exts = NULL;
      s->tlsext_ocsp_resp = NULL;
      s->tlsext_ocsp_resplen = -1;
      SSL_CTX_up_ref(ctx);
      s->initial_ctx = ctx;
  # ifndef OPENSSL_NO_EC
      if (ctx->tlsext_ecpointformatlist) {
          s->tlsext_ecpointformatlist =
              OPENSSL_memdup(ctx->tlsext_ecpointformatlist,
                             ctx->tlsext_ecpointformatlist_length);
          if (!s->tlsext_ecpointformatlist)
              goto err;
          s->tlsext_ecpointformatlist_length =
              ctx->tlsext_ecpointformatlist_length;
      }
      if (ctx->tlsext_ellipticcurvelist) {
          s->tlsext_ellipticcurvelist =
              OPENSSL_memdup(ctx->tlsext_ellipticcurvelist,
                             ctx->tlsext_ellipticcurvelist_length);
          if (!s->tlsext_ellipticcurvelist)
              goto err;
          s->tlsext_ellipticcurvelist_length =
              ctx->tlsext_ellipticcurvelist_length;
      }
  # endif
  # ifndef OPENSSL_NO_NEXTPROTONEG
      s->next_proto_negotiated = NULL;
  # endif
  
      if (s->ctx->alpn_client_proto_list) {
          s->alpn_client_proto_list =
              OPENSSL_malloc(s->ctx->alpn_client_proto_list_len);
          if (s->alpn_client_proto_list == NULL)
              goto err;
          memcpy(s->alpn_client_proto_list, s->ctx->alpn_client_proto_list,
                 s->ctx->alpn_client_proto_list_len);
          s->alpn_client_proto_list_len = s->ctx->alpn_client_proto_list_len;
      }
  
      s->verified_chain = NULL;
      s->verify_result = X509_V_OK;
  
      s->default_passwd_callback = ctx->default_passwd_callback;
      s->default_passwd_callback_userdata = ctx->default_passwd_callback_userdata;
  
      s->method = ctx->method;
  
      if (!s->method->ssl_new(s))
          goto err;
  
      s->server = (ctx->method->ssl_accept == ssl_undefined_function) ? 0 : 1;
  
      if (!SSL_clear(s))
          goto err;
  
      if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data))
          goto err;
  
  #ifndef OPENSSL_NO_PSK
      s->psk_client_callback = ctx->psk_client_callback;
      s->psk_server_callback = ctx->psk_server_callback;
  #endif
  
      s->job = NULL;
  
  #ifndef OPENSSL_NO_CT
      if (!SSL_set_ct_validation_callback(s, ctx->ct_validation_callback,
              ctx->ct_validation_callback_arg))
          goto err;
  #endif
  
      return s;
   err:
      SSL_free(s);
      SSLerr(SSL_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
      return NULL;
  }
  
  int SSL_is_dtls(const SSL *s)
  {
      return SSL_IS_DTLS(s) ? 1 : 0;
  }
  
  int SSL_up_ref(SSL *s)
  {
      int i;
  
      if (CRYPTO_atomic_add(&s->references, 1, &i, s->lock) <= 0)
          return 0;
  
      REF_PRINT_COUNT("SSL", s);
      REF_ASSERT_ISNT(i < 2);
      return ((i > 1) ? 1 : 0);
  }
  
  int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
                                     unsigned int sid_ctx_len)
  {
      if (sid_ctx_len > sizeof ctx->sid_ctx) {
          SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,
                 SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
          return 0;
      }
      ctx->sid_ctx_length = sid_ctx_len;
      memcpy(ctx->sid_ctx, sid_ctx, sid_ctx_len);
  
      return 1;
  }
  
  int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
                                 unsigned int sid_ctx_len)
  {
      if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
          SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,
                 SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
          return 0;
      }
      ssl->sid_ctx_length = sid_ctx_len;
      memcpy(ssl->sid_ctx, sid_ctx, sid_ctx_len);
  
      return 1;
  }
  
  int SSL_CTX_set_generate_session_id(SSL_CTX *ctx, GEN_SESSION_CB cb)
  {
      CRYPTO_THREAD_write_lock(ctx->lock);
      ctx->generate_session_id = cb;
      CRYPTO_THREAD_unlock(ctx->lock);
      return 1;
  }
  
  int SSL_set_generate_session_id(SSL *ssl, GEN_SESSION_CB cb)
  {
      CRYPTO_THREAD_write_lock(ssl->lock);
      ssl->generate_session_id = cb;
      CRYPTO_THREAD_unlock(ssl->lock);
      return 1;
  }
  
  int SSL_has_matching_session_id(const SSL *ssl, const unsigned char *id,
                                  unsigned int id_len)
  {
      /*
       * A quick examination of SSL_SESSION_hash and SSL_SESSION_cmp shows how
       * we can "construct" a session to give us the desired check - ie. to
       * find if there's a session in the hash table that would conflict with
       * any new session built out of this id/id_len and the ssl_version in use
       * by this SSL.
       */
      SSL_SESSION r, *p;
  
      if (id_len > sizeof r.session_id)
          return 0;
  
      r.ssl_version = ssl->version;
      r.session_id_length = id_len;
      memcpy(r.session_id, id, id_len);
  
      CRYPTO_THREAD_read_lock(ssl->session_ctx->lock);
      p = lh_SSL_SESSION_retrieve(ssl->session_ctx->sessions, &r);
      CRYPTO_THREAD_unlock(ssl->session_ctx->lock);
      return (p != NULL);
  }
  
  int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
  {
      return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
  }
  
  int SSL_set_purpose(SSL *s, int purpose)
  {
      return X509_VERIFY_PARAM_set_purpose(s->param, purpose);
  }
  
  int SSL_CTX_set_trust(SSL_CTX *s, int trust)
  {
      return X509_VERIFY_PARAM_set_trust(s->param, trust);
  }
  
  int SSL_set_trust(SSL *s, int trust)
  {
      return X509_VERIFY_PARAM_set_trust(s->param, trust);
  }
  
  int SSL_set1_host(SSL *s, const char *hostname)
  {
      return X509_VERIFY_PARAM_set1_host(s->param, hostname, 0);
  }
  
  int SSL_add1_host(SSL *s, const char *hostname)
  {
      return X509_VERIFY_PARAM_add1_host(s->param, hostname, 0);
  }
  
  void SSL_set_hostflags(SSL *s, unsigned int flags)
  {
      X509_VERIFY_PARAM_set_hostflags(s->param, flags);
  }
  
  const char *SSL_get0_peername(SSL *s)
  {
      return X509_VERIFY_PARAM_get0_peername(s->param);
  }
  
  int SSL_CTX_dane_enable(SSL_CTX *ctx)
  {
      return dane_ctx_enable(&ctx->dane);
  }
  
  int SSL_dane_enable(SSL *s, const char *basedomain)
  {
      SSL_DANE *dane = &s->dane;
  
      if (s->ctx->dane.mdmax == 0) {
          SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_CONTEXT_NOT_DANE_ENABLED);
          return 0;
      }
      if (dane->trecs != NULL) {
          SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_DANE_ALREADY_ENABLED);
          return 0;
      }
  
      /*
       * Default SNI name.  This rejects empty names, while set1_host below
       * accepts them and disables host name checks.  To avoid side-effects with
       * invalid input, set the SNI name first.
       */
      if (s->tlsext_hostname == NULL) {
          if (!SSL_set_tlsext_host_name(s, basedomain)) {
              SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_ERROR_SETTING_TLSA_BASE_DOMAIN);
              return -1;
          }
      }
  
      /* Primary RFC6125 reference identifier */
      if (!X509_VERIFY_PARAM_set1_host(s->param, basedomain, 0)) {
          SSLerr(SSL_F_SSL_DANE_ENABLE, SSL_R_ERROR_SETTING_TLSA_BASE_DOMAIN);
          return -1;
      }
  
      dane->mdpth = -1;
      dane->pdpth = -1;
      dane->dctx = &s->ctx->dane;
      dane->trecs = sk_danetls_record_new_null();
  
      if (dane->trecs == NULL) {
          SSLerr(SSL_F_SSL_DANE_ENABLE, ERR_R_MALLOC_FAILURE);
          return -1;
      }
      return 1;
  }
  
  int SSL_get0_dane_authority(SSL *s, X509 **mcert, EVP_PKEY **mspki)
  {
      SSL_DANE *dane = &s->dane;
  
      if (!DANETLS_ENABLED(dane) || s->verify_result != X509_V_OK)
          return -1;
      if (dane->mtlsa) {
          if (mcert)
              *mcert = dane->mcert;
          if (mspki)
              *mspki = (dane->mcert == NULL) ? dane->mtlsa->spki : NULL;
      }
      return dane->mdpth;
  }
  
  int SSL_get0_dane_tlsa(SSL *s, uint8_t *usage, uint8_t *selector,
                         uint8_t *mtype, unsigned const char **data, size_t *dlen)
  {
      SSL_DANE *dane = &s->dane;
  
      if (!DANETLS_ENABLED(dane) || s->verify_result != X509_V_OK)
          return -1;
      if (dane->mtlsa) {
          if (usage)
              *usage = dane->mtlsa->usage;
          if (selector)
              *selector = dane->mtlsa->selector;
          if (mtype)
              *mtype = dane->mtlsa->mtype;
          if (data)
              *data = dane->mtlsa->data;
          if (dlen)
              *dlen = dane->mtlsa->dlen;
      }
      return dane->mdpth;
  }
  
  SSL_DANE *SSL_get0_dane(SSL *s)
  {
      return &s->dane;
  }
  
  int SSL_dane_tlsa_add(SSL *s, uint8_t usage, uint8_t selector,
                        uint8_t mtype, unsigned char *data, size_t dlen)
  {
      return dane_tlsa_add(&s->dane, usage, selector, mtype, data, dlen);
  }
  
  int SSL_CTX_dane_mtype_set(SSL_CTX *ctx, const EVP_MD *md, uint8_t mtype, uint8_t ord)
  {
      return dane_mtype_set(&ctx->dane, md, mtype, ord);
  }
  
  int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm)
  {
      return X509_VERIFY_PARAM_set1(ctx->param, vpm);
  }
  
  int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)
  {
      return X509_VERIFY_PARAM_set1(ssl->param, vpm);
  }
  
  X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
  {
      return ctx->param;
  }
  
  X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
  {
      return ssl->param;
  }
  
  void SSL_certs_clear(SSL *s)
  {
      ssl_cert_clear_certs(s->cert);
  }
  
  void SSL_free(SSL *s)
  {
      int i;
  
      if (s == NULL)
          return;
  
      CRYPTO_atomic_add(&s->references, -1, &i, s->lock);
      REF_PRINT_COUNT("SSL", s);
      if (i > 0)
          return;
      REF_ASSERT_ISNT(i < 0);
  
      X509_VERIFY_PARAM_free(s->param);
      dane_final(&s->dane);
      CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);
  
      if (s->bbio != NULL) {
          /* If the buffering BIO is in place, pop it off */
          if (s->bbio == s->wbio) {
              s->wbio = BIO_pop(s->wbio);
          }
          BIO_free(s->bbio);
          s->bbio = NULL;
      }
      if (s->wbio != s->rbio)
          BIO_free_all(s->wbio);
      BIO_free_all(s->rbio);
  
      BUF_MEM_free(s->init_buf);
  
      /* add extra stuff */
      sk_SSL_CIPHER_free(s->cipher_list);
      sk_SSL_CIPHER_free(s->cipher_list_by_id);
  
      /* Make the next call work :-) */
      if (s->session != NULL) {
          ssl_clear_bad_session(s);
          SSL_SESSION_free(s->session);
      }
  
      clear_ciphers(s);
  
      ssl_cert_free(s->cert);
      /* Free up if allocated */
  
      OPENSSL_free(s->tlsext_hostname);
      SSL_CTX_free(s->initial_ctx);
  #ifndef OPENSSL_NO_EC
      OPENSSL_free(s->tlsext_ecpointformatlist);
      OPENSSL_free(s->tlsext_ellipticcurvelist);
  #endif                         /* OPENSSL_NO_EC */
      sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, X509_EXTENSION_free);
  #ifndef OPENSSL_NO_OCSP
      sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
  #endif
  #ifndef OPENSSL_NO_CT
      SCT_LIST_free(s->scts);
      OPENSSL_free(s->tlsext_scts);
  #endif
      OPENSSL_free(s->tlsext_ocsp_resp);
      OPENSSL_free(s->alpn_client_proto_list);
  
      sk_X509_NAME_pop_free(s->client_CA, X509_NAME_free);
  
      sk_X509_pop_free(s->verified_chain, X509_free);
  
      if (s->method != NULL)
          s->method->ssl_free(s);
  
      RECORD_LAYER_release(&s->rlayer);
  
      SSL_CTX_free(s->ctx);
  
      ASYNC_WAIT_CTX_free(s->waitctx);
  
  #if !defined(OPENSSL_NO_NEXTPROTONEG)
      OPENSSL_free(s->next_proto_negotiated);
  #endif
  
  #ifndef OPENSSL_NO_SRTP
      sk_SRTP_PROTECTION_PROFILE_free(s->srtp_profiles);
  #endif
  
      CRYPTO_THREAD_lock_free(s->lock);
  
      OPENSSL_free(s);
  }
  
  void SSL_set_rbio(SSL *s, BIO *rbio)
  {
      if (s->rbio != rbio)
          BIO_free_all(s->rbio);
      s->rbio = rbio;
  }
  
  void SSL_set_wbio(SSL *s, BIO *wbio)
  {
      /*
       * If the output buffering BIO is still in place, remove it
       */
      if (s->bbio != NULL) {
          if (s->wbio == s->bbio) {
              s->wbio = BIO_next(s->wbio);
              BIO_set_next(s->bbio, NULL);
          }
      }
      if (s->wbio != wbio && s->rbio != s->wbio)
          BIO_free_all(s->wbio);
      s->wbio = wbio;
  }
  
  void SSL_set_bio(SSL *s, BIO *rbio, BIO *wbio)
  {
      SSL_set_wbio(s, wbio);
      SSL_set_rbio(s, rbio);
  }
  
  BIO *SSL_get_rbio(const SSL *s)
  {
      return (s->rbio);
  }
  
  BIO *SSL_get_wbio(const SSL *s)
  {
      return (s->wbio);
  }
  
  int SSL_get_fd(const SSL *s)
  {
      return (SSL_get_rfd(s));
  }
  
  int SSL_get_rfd(const SSL *s)
  {
      int ret = -1;
      BIO *b, *r;
  
      b = SSL_get_rbio(s);
      r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
      if (r != NULL)
          BIO_get_fd(r, &ret);
      return (ret);
  }
  
  int SSL_get_wfd(const SSL *s)
  {
      int ret = -1;
      BIO *b, *r;
  
      b = SSL_get_wbio(s);
      r = BIO_find_type(b, BIO_TYPE_DESCRIPTOR);
      if (r != NULL)
          BIO_get_fd(r, &ret);
      return (ret);
  }
  
  #ifndef OPENSSL_NO_SOCK
  int SSL_set_fd(SSL *s, int fd)
  {
      int ret = 0;
      BIO *bio = NULL;
  
      bio = BIO_new(BIO_s_socket());
  
      if (bio == NULL) {
          SSLerr(SSL_F_SSL_SET_FD, ERR_R_BUF_LIB);
          goto err;
      }
      BIO_set_fd(bio, fd, BIO_NOCLOSE);
      SSL_set_bio(s, bio, bio);
      ret = 1;
   err:
      return (ret);
  }
  
  int SSL_set_wfd(SSL *s, int fd)
  {
      int ret = 0;
      BIO *bio = NULL;
  
      if ((s->rbio == NULL) || (BIO_method_type(s->rbio) != BIO_TYPE_SOCKET)
          || ((int)BIO_get_fd(s->rbio, NULL) != fd)) {
          bio = BIO_new(BIO_s_socket());
  
          if (bio == NULL) {
              SSLerr(SSL_F_SSL_SET_WFD, ERR_R_BUF_LIB);
              goto err;
          }
          BIO_set_fd(bio, fd, BIO_NOCLOSE);
          SSL_set_bio(s, SSL_get_rbio(s), bio);
      } else
          SSL_set_bio(s, SSL_get_rbio(s), SSL_get_rbio(s));
      ret = 1;
   err:
      return (ret);
  }
  
  int SSL_set_rfd(SSL *s, int fd)
  {
      int ret = 0;
      BIO *bio = NULL;
  
      if ((s->wbio == NULL) || (BIO_method_type(s->wbio) != BIO_TYPE_SOCKET)
          || ((int)BIO_get_fd(s->wbio, NULL) != fd)) {
          bio = BIO_new(BIO_s_socket());
  
          if (bio == NULL) {
              SSLerr(SSL_F_SSL_SET_RFD, ERR_R_BUF_LIB);
              goto err;
          }
          BIO_set_fd(bio, fd, BIO_NOCLOSE);
          SSL_set_bio(s, bio, SSL_get_wbio(s));
      } else
          SSL_set_bio(s, SSL_get_wbio(s), SSL_get_wbio(s));
      ret = 1;
   err:
      return (ret);
  }
  #endif
  
  /* return length of latest Finished message we sent, copy to 'buf' */
  size_t SSL_get_finished(const SSL *s, void *buf, size_t count)
  {
      size_t ret = 0;
  
      if (s->s3 != NULL) {
          ret = s->s3->tmp.finish_md_len;
          if (count > ret)
              count = ret;
          memcpy(buf, s->s3->tmp.finish_md, count);
      }
      return ret;
  }
  
  /* return length of latest Finished message we expected, copy to 'buf' */
  size_t SSL_get_peer_finished(const SSL *s, void *buf, size_t count)
  {
      size_t ret = 0;
  
      if (s->s3 != NULL) {
          ret = s->s3->tmp.peer_finish_md_len;
          if (count > ret)
              count = ret;
          memcpy(buf, s->s3->tmp.peer_finish_md, count);
      }
      return ret;
  }
  
  int SSL_get_verify_mode(const SSL *s)
  {
      return (s->verify_mode);
  }
  
  int SSL_get_verify_depth(const SSL *s)
  {
      return X509_VERIFY_PARAM_get_depth(s->param);
  }
  
  int (*SSL_get_verify_callback(const SSL *s)) (int, X509_STORE_CTX *) {
      return (s->verify_callback);
  }
  
  int SSL_CTX_get_verify_mode(const SSL_CTX *ctx)
  {
      return (ctx->verify_mode);
  }
  
  int SSL_CTX_get_verify_depth(const SSL_CTX *ctx)
  {
      return X509_VERIFY_PARAM_get_depth(ctx->param);
  }
  
  int (*SSL_CTX_get_verify_callback(const SSL_CTX *ctx)) (int, X509_STORE_CTX *) {
      return (ctx->default_verify_callback);
  }
  
  void SSL_set_verify(SSL *s, int mode,
                      int (*callback) (int ok, X509_STORE_CTX *ctx))
  {
      s->verify_mode = mode;
      if (callback != NULL)
          s->verify_callback = callback;
  }
  
  void SSL_set_verify_depth(SSL *s, int depth)
  {
      X509_VERIFY_PARAM_set_depth(s->param, depth);
  }
  
  void SSL_set_read_ahead(SSL *s, int yes)
  {
      RECORD_LAYER_set_read_ahead(&s->rlayer, yes);
  }
  
  int SSL_get_read_ahead(const SSL *s)
  {
      return RECORD_LAYER_get_read_ahead(&s->rlayer);
  }
  
  int SSL_pending(const SSL *s)
  {
      /*
       * SSL_pending cannot work properly if read-ahead is enabled
       * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)), and it is
       * impossible to fix since SSL_pending cannot report errors that may be
       * observed while scanning the new data. (Note that SSL_pending() is
       * often used as a boolean value, so we'd better not return -1.)
       */
      return (s->method->ssl_pending(s));
  }
  
  int SSL_has_pending(const SSL *s)
  {
      /*
       * Similar to SSL_pending() but returns a 1 to indicate that we have
       * unprocessed data available or 0 otherwise (as opposed to the number of
       * bytes available). Unlike SSL_pending() this will take into account
       * read_ahead data. A 1 return simply indicates that we have unprocessed
       * data. That data may not result in any application data, or we may fail
       * to parse the records for some reason.
       */
      if (SSL_pending(s))
          return 1;
  
      return RECORD_LAYER_read_pending(&s->rlayer);
  }
  
  X509 *SSL_get_peer_certificate(const SSL *s)
  {
      X509 *r;
  
      if ((s == NULL) || (s->session == NULL))
          r = NULL;
      else
          r = s->session->peer;
  
      if (r == NULL)
          return (r);
  
      X509_up_ref(r);
  
      return (r);
  }
  
  STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *s)
  {
      STACK_OF(X509) *r;
  
      if ((s == NULL) || (s->session == NULL))
          r = NULL;
      else
          r = s->session->peer_chain;
  
      /*
       * If we are a client, cert_chain includes the peer's own certificate; if
       * we are a server, it does not.
       */
  
      return (r);
  }
  
  /*
   * Now in theory, since the calling process own 't' it should be safe to
   * modify.  We need to be able to read f without being hassled
   */
  int SSL_copy_session_id(SSL *t, const SSL *f)
  {
      int i;
      /* Do we need to to SSL locking? */
      if (!SSL_set_session(t, SSL_get_session(f))) {
          return 0;
      }
  
      /*
       * what if we are setup for one protocol version but want to talk another
       */
      if (t->method != f->method) {
          t->method->ssl_free(t);
          t->method = f->method;
          if (t->method->ssl_new(t) == 0)
              return 0;
      }
  
      CRYPTO_atomic_add(&f->cert->references, 1, &i, f->cert->lock);
      ssl_cert_free(t->cert);
      t->cert = f->cert;
      if (!SSL_set_session_id_context(t, f->sid_ctx, f->sid_ctx_length)) {
          return 0;
      }
  
      return 1;
  }
  
  /* Fix this so it checks all the valid key/cert options */
  int SSL_CTX_check_private_key(const SSL_CTX *ctx)
  {
      if ((ctx == NULL) ||
          (ctx->cert->key->x509 == NULL)) {
          SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,
                 SSL_R_NO_CERTIFICATE_ASSIGNED);
          return (0);
      }
      if (ctx->cert->key->privatekey == NULL) {
          SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,
                 SSL_R_NO_PRIVATE_KEY_ASSIGNED);
          return (0);
      }
      return (X509_check_private_key
              (ctx->cert->key->x509, ctx->cert->key->privatekey));
  }
  
  /* Fix this function so that it takes an optional type parameter */
  int SSL_check_private_key(const SSL *ssl)
  {
      if (ssl == NULL) {
          SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
          return (0);
      }
      if (ssl->cert->key->x509 == NULL) {
          SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_CERTIFICATE_ASSIGNED);
          return (0);
      }
      if (ssl->cert->key->privatekey == NULL) {
          SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY, SSL_R_NO_PRIVATE_KEY_ASSIGNED);
          return (0);
      }
      return (X509_check_private_key(ssl->cert->key->x509,
                                     ssl->cert->key->privatekey));
  }
  
  int SSL_waiting_for_async(SSL *s)
  {
      if(s->job)
          return 1;
  
      return 0;
  }
  
  int SSL_get_all_async_fds(SSL *s, OSSL_ASYNC_FD *fds, size_t *numfds)
  {
      ASYNC_WAIT_CTX *ctx = s->waitctx;
  
      if (ctx == NULL)
          return 0;
      return ASYNC_WAIT_CTX_get_all_fds(ctx, fds, numfds);
  }
  
  int SSL_get_changed_async_fds(SSL *s, OSSL_ASYNC_FD *addfd, size_t *numaddfds,
                                OSSL_ASYNC_FD *delfd, size_t *numdelfds)
  {
      ASYNC_WAIT_CTX *ctx = s->waitctx;
  
      if (ctx == NULL)
          return 0;
      return ASYNC_WAIT_CTX_get_changed_fds(ctx, addfd, numaddfds, delfd,
                                            numdelfds);
  }
  
  int SSL_accept(SSL *s)
  {
      if (s->handshake_func == NULL) {
          /* Not properly initialized yet */
          SSL_set_accept_state(s);
      }
  
      return SSL_do_handshake(s);
  }
  
  int SSL_connect(SSL *s)
  {
      if (s->handshake_func == NULL) {
          /* Not properly initialized yet */
          SSL_set_connect_state(s);
      }
  
      return SSL_do_handshake(s);
  }
  
  long SSL_get_default_timeout(const SSL *s)
  {
      return (s->method->get_timeout());
  }
  
  static int ssl_start_async_job(SSL *s, struct ssl_async_args *args,
                            int (*func)(void *)) {
      int ret;
      if (s->waitctx == NULL) {
          s->waitctx = ASYNC_WAIT_CTX_new();
          if (s->waitctx == NULL)
              return -1;
      }
      switch(ASYNC_start_job(&s->job, s->waitctx, &ret, func, args,
          sizeof(struct ssl_async_args))) {
      case ASYNC_ERR:
          s->rwstate = SSL_NOTHING;
          SSLerr(SSL_F_SSL_START_ASYNC_JOB, SSL_R_FAILED_TO_INIT_ASYNC);
          return -1;
      case ASYNC_PAUSE:
          s->rwstate = SSL_ASYNC_PAUSED;
          return -1;
      case ASYNC_NO_JOBS:
          s->rwstate = SSL_ASYNC_NO_JOBS;
          return -1;
      case ASYNC_FINISH:
          s->job = NULL;
          return ret;
      default:
          s->rwstate = SSL_NOTHING;
          SSLerr(SSL_F_SSL_START_ASYNC_JOB, ERR_R_INTERNAL_ERROR);
          /* Shouldn't happen */
          return -1;
      }
  }
  
  static int ssl_io_intern(void *vargs)
  {
      struct ssl_async_args *args;
      SSL *s;
      void *buf;
      int num;
  
      args = (struct ssl_async_args *)vargs;
      s = args->s;
      buf = args->buf;
      num = args->num;
      switch (args->type) {
      case READFUNC:
          return args->f.func_read(s, buf, num);
      case WRITEFUNC:
          return args->f.func_write(s, buf, num);
      case OTHERFUNC:
          return args->f.func_other(s);
      }
      return -1;
  }
  
  int SSL_read(SSL *s, void *buf, int num)
  {
      if (s->handshake_func == NULL) {
          SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
          return -1;
      }
  
      if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
          s->rwstate = SSL_NOTHING;
          return (0);
      }
  
      if((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
          struct ssl_async_args args;
  
          args.s = s;
          args.buf = buf;
          args.num = num;
          args.type = READFUNC;
          args.f.func_read = s->method->ssl_read;
  
          return ssl_start_async_job(s, &args, ssl_io_intern);
      } else {
          return s->method->ssl_read(s, buf, num);
      }
  }
  
  int SSL_peek(SSL *s, void *buf, int num)
  {
      if (s->handshake_func == NULL) {
          SSLerr(SSL_F_SSL_PEEK, SSL_R_UNINITIALIZED);
          return -1;
      }
  
      if (s->shutdown & SSL_RECEIVED_SHUTDOWN) {
          return (0);
      }
      if((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
          struct ssl_async_args args;
  
          args.s = s;
          args.buf = buf;
          args.num = num;
          args.type = READFUNC;
          args.f.func_read = s->method->ssl_peek;
  
          return ssl_start_async_job(s, &args, ssl_io_intern);
      } else {
          return s->method->ssl_peek(s, buf, num);
      }
  }
  
  int SSL_write(SSL *s, const void *buf, int num)
  {
      if (s->handshake_func == NULL) {
          SSLerr(SSL_F_SSL_WRITE, SSL_R_UNINITIALIZED);
          return -1;
      }
  
      if (s->shutdown & SSL_SENT_SHUTDOWN) {
          s->rwstate = SSL_NOTHING;
          SSLerr(SSL_F_SSL_WRITE, SSL_R_PROTOCOL_IS_SHUTDOWN);
          return (-1);
      }
  
      if((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
          struct ssl_async_args args;
  
          args.s = s;
          args.buf = (void *)buf;
          args.num = num;
          args.type = WRITEFUNC;
          args.f.func_write = s->method->ssl_write;
  
          return ssl_start_async_job(s, &args, ssl_io_intern);
      } else {
          return s->method->ssl_write(s, buf, num);
      }
  }
  
  int SSL_shutdown(SSL *s)
  {
      /*
       * Note that this function behaves differently from what one might
       * expect.  Return values are 0 for no success (yet), 1 for success; but
       * calling it once is usually not enough, even if blocking I/O is used
       * (see ssl3_shutdown).
       */
  
      if (s->handshake_func == NULL) {
          SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
          return -1;
      }
  
      if (!SSL_in_init(s)) {
          if((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
              struct ssl_async_args args;
  
              args.s = s;
              args.type = OTHERFUNC;
              args.f.func_other = s->method->ssl_shutdown;
  
              return ssl_start_async_job(s, &args, ssl_io_intern);
          } else {
              return s->method->ssl_shutdown(s);
          }
      } else {
          SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_SHUTDOWN_WHILE_IN_INIT);
          return -1;
      }
  }
  
  int SSL_renegotiate(SSL *s)
  {
      if (s->renegotiate == 0)
          s->renegotiate = 1;
  
      s->new_session = 1;
  
      return (s->method->ssl_renegotiate(s));
  }
  
  int SSL_renegotiate_abbreviated(SSL *s)
  {
      if (s->renegotiate == 0)
          s->renegotiate = 1;
  
      s->new_session = 0;
  
      return (s->method->ssl_renegotiate(s));
  }
  
  int SSL_renegotiate_pending(SSL *s)
  {
      /*
       * becomes true when negotiation is requested; false again once a
       * handshake has finished
       */
      return (s->renegotiate != 0);
  }
  
  long SSL_ctrl(SSL *s, int cmd, long larg, void *parg)
  {
      long l;
  
      switch (cmd) {
      case SSL_CTRL_GET_READ_AHEAD:
          return (RECORD_LAYER_get_read_ahead(&s->rlayer));
      case SSL_CTRL_SET_READ_AHEAD:
          l = RECORD_LAYER_get_read_ahead(&s->rlayer);
          RECORD_LAYER_set_read_ahead(&s->rlayer, larg);
          return (l);
  
      case SSL_CTRL_SET_MSG_CALLBACK_ARG:
          s->msg_callback_arg = parg;
          return 1;
  
      case SSL_CTRL_MODE:
          return (s->mode |= larg);
      case SSL_CTRL_CLEAR_MODE:
          return (s->mode &= ~larg);
      case SSL_CTRL_GET_MAX_CERT_LIST:
          return (s->max_cert_list);
      case SSL_CTRL_SET_MAX_CERT_LIST:
          l = s->max_cert_list;
          s->max_cert_list = larg;
          return (l);
      case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
          if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
              return 0;
          s->max_send_fragment = larg;
          if (s->max_send_fragment < s->split_send_fragment)
              s->split_send_fragment = s->max_send_fragment;
          return 1;
      case SSL_CTRL_SET_SPLIT_SEND_FRAGMENT:
          if ((unsigned int)larg > s->max_send_fragment || larg == 0)
              return 0;
          s->split_send_fragment = larg;
          return 1;
      case SSL_CTRL_SET_MAX_PIPELINES:
          if (larg < 1 || larg > SSL_MAX_PIPELINES)
              return 0;
          s->max_pipelines = larg;
          if (larg > 1)
              RECORD_LAYER_set_read_ahead(&s->rlayer, 1);
          return 1;
      case SSL_CTRL_GET_RI_SUPPORT:
          if (s->s3)
              return s->s3->send_connection_binding;
          else
              return 0;
      case SSL_CTRL_CERT_FLAGS:
          return (s->cert->cert_flags |= larg);
      case SSL_CTRL_CLEAR_CERT_FLAGS:
          return (s->cert->cert_flags &= ~larg);
  
      case SSL_CTRL_GET_RAW_CIPHERLIST:
          if (parg) {
              if (s->s3->tmp.ciphers_raw == NULL)
                  return 0;
              *(unsigned char **)parg = s->s3->tmp.ciphers_raw;
              return (int)s->s3->tmp.ciphers_rawlen;
          } else {
              return TLS_CIPHER_LEN;
          }
      case SSL_CTRL_GET_EXTMS_SUPPORT:
          if (!s->session || SSL_in_init(s) || ossl_statem_get_in_handshake(s))
                  return -1;
          if (s->session->flags & SSL_SESS_FLAG_EXTMS)
              return 1;
          else
              return 0;
      case SSL_CTRL_SET_MIN_PROTO_VERSION:
          return ssl_set_version_bound(s->ctx->method->version, (int)larg,
                                       &s->min_proto_version);
      case SSL_CTRL_SET_MAX_PROTO_VERSION:
          return ssl_set_version_bound(s->ctx->method->version, (int)larg,
                                       &s->max_proto_version);
      default:
          return (s->method->ssl_ctrl(s, cmd, larg, parg));
      }
  }
  
  long SSL_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
  {
      switch (cmd) {
      case SSL_CTRL_SET_MSG_CALLBACK:
          s->msg_callback = (void (*)
                             (int write_p, int version, int content_type,
                              const void *buf, size_t len, SSL *ssl,
                              void *arg))(fp);
          return 1;
  
      default:
          return (s->method->ssl_callback_ctrl(s, cmd, fp));
      }
  }
  
  LHASH_OF(SSL_SESSION) *SSL_CTX_sessions(SSL_CTX *ctx)
  {
      return ctx->sessions;
  }
  
  long SSL_CTX_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
  {
      long l;
      /* For some cases with ctx == NULL perform syntax checks */
      if (ctx == NULL) {
          switch (cmd) {
  #ifndef OPENSSL_NO_EC
          case SSL_CTRL_SET_CURVES_LIST:
              return tls1_set_curves_list(NULL, NULL, parg);
  #endif
          case SSL_CTRL_SET_SIGALGS_LIST:
          case SSL_CTRL_SET_CLIENT_SIGALGS_LIST:
              return tls1_set_sigalgs_list(NULL, parg, 0);
          default:
              return 0;
          }
      }
  
      switch (cmd) {
      case SSL_CTRL_GET_READ_AHEAD:
          return (ctx->read_ahead);
      case SSL_CTRL_SET_READ_AHEAD:
          l = ctx->read_ahead;
          ctx->read_ahead = larg;
          return (l);
  
      case SSL_CTRL_SET_MSG_CALLBACK_ARG:
          ctx->msg_callback_arg = parg;
          return 1;
  
      case SSL_CTRL_GET_MAX_CERT_LIST:
          return (ctx->max_cert_list);
      case SSL_CTRL_SET_MAX_CERT_LIST:
          l = ctx->max_cert_list;
          ctx->max_cert_list = larg;
          return (l);
  
      case SSL_CTRL_SET_SESS_CACHE_SIZE:
          l = ctx->session_cache_size;
          ctx->session_cache_size = larg;
          return (l);
      case SSL_CTRL_GET_SESS_CACHE_SIZE:
          return (ctx->session_cache_size);
      case SSL_CTRL_SET_SESS_CACHE_MODE:
          l = ctx->session_cache_mode;
          ctx->session_cache_mode = larg;
          return (l);
      case SSL_CTRL_GET_SESS_CACHE_MODE:
          return (ctx->session_cache_mode);
  
      case SSL_CTRL_SESS_NUMBER:
          return (lh_SSL_SESSION_num_items(ctx->sessions));
      case SSL_CTRL_SESS_CONNECT:
          return (ctx->stats.sess_connect);
      case SSL_CTRL_SESS_CONNECT_GOOD:
          return (ctx->stats.sess_connect_good);
      case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
          return (ctx->stats.sess_connect_renegotiate);
      case SSL_CTRL_SESS_ACCEPT:
          return (ctx->stats.sess_accept);
      case SSL_CTRL_SESS_ACCEPT_GOOD:
          return (ctx->stats.sess_accept_good);
      case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
          return (ctx->stats.sess_accept_renegotiate);
      case SSL_CTRL_SESS_HIT:
          return (ctx->stats.sess_hit);
      case SSL_CTRL_SESS_CB_HIT:
          return (ctx->stats.sess_cb_hit);
      case SSL_CTRL_SESS_MISSES:
          return (ctx->stats.sess_miss);
      case SSL_CTRL_SESS_TIMEOUTS:
          return (ctx->stats.sess_timeout);
      case SSL_CTRL_SESS_CACHE_FULL:
          return (ctx->stats.sess_cache_full);
      case SSL_CTRL_MODE:
          return (ctx->mode |= larg);
      case SSL_CTRL_CLEAR_MODE:
          return (ctx->mode &= ~larg);
      case SSL_CTRL_SET_MAX_SEND_FRAGMENT:
          if (larg < 512 || larg > SSL3_RT_MAX_PLAIN_LENGTH)
              return 0;
          ctx->max_send_fragment = larg;
          if (ctx->max_send_fragment < ctx->split_send_fragment)
              ctx->split_send_fragment = ctx->max_send_fragment;
          return 1;
      case SSL_CTRL_SET_SPLIT_SEND_FRAGMENT:
          if ((unsigned int)larg > ctx->max_send_fragment || larg == 0)
              return 0;
          ctx->split_send_fragment = larg;
          return 1;
      case SSL_CTRL_SET_MAX_PIPELINES:
          if (larg < 1 || larg > SSL_MAX_PIPELINES)
              return 0;
          ctx->max_pipelines = larg;
          return 1;
      case SSL_CTRL_CERT_FLAGS:
          return (ctx->cert->cert_flags |= larg);
      case SSL_CTRL_CLEAR_CERT_FLAGS:
          return (ctx->cert->cert_flags &= ~larg);
      case SSL_CTRL_SET_MIN_PROTO_VERSION:
          return ssl_set_version_bound(ctx->method->version, (int)larg,
                                       &ctx->min_proto_version);
      case SSL_CTRL_SET_MAX_PROTO_VERSION:
          return ssl_set_version_bound(ctx->method->version, (int)larg,
                                       &ctx->max_proto_version);
      default:
          return (ctx->method->ssl_ctx_ctrl(ctx, cmd, larg, parg));
      }
  }
  
  long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
  {
      switch (cmd) {
      case SSL_CTRL_SET_MSG_CALLBACK:
          ctx->msg_callback = (void (*)
                               (int write_p, int version, int content_type,
                                const void *buf, size_t len, SSL *ssl,
                                void *arg))(fp);
          return 1;
  
      default:
          return (ctx->method->ssl_ctx_callback_ctrl(ctx, cmd, fp));
      }
  }
  
  int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
  {
      if (a->id > b->id)
          return 1;
      if (a->id < b->id)
          return -1;
      return 0;
  }
  
  int ssl_cipher_ptr_id_cmp(const SSL_CIPHER *const *ap,
                            const SSL_CIPHER *const *bp)
  {
      if ((*ap)->id > (*bp)->id)
          return 1;
      if ((*ap)->id < (*bp)->id)
          return -1;
      return 0;
  }
  
  /** return a STACK of the ciphers available for the SSL and in order of
   * preference */
  STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *s)
  {
      if (s != NULL) {
          if (s->cipher_list != NULL) {
              return (s->cipher_list);
          } else if ((s->ctx != NULL) && (s->ctx->cipher_list != NULL)) {
              return (s->ctx->cipher_list);
          }
      }
      return (NULL);
  }
  
  STACK_OF(SSL_CIPHER) *SSL_get_client_ciphers(const SSL *s)
  {
      if ((s == NULL) || (s->session == NULL) || !s->server)
          return NULL;
      return s->session->ciphers;
  }
  
  STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s)
  {
      STACK_OF(SSL_CIPHER) *sk = NULL, *ciphers;
      int i;
      ciphers = SSL_get_ciphers(s);
      if (!ciphers)
          return NULL;
      ssl_set_client_disabled(s);
      for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
          const SSL_CIPHER *c = sk_SSL_CIPHER_value(ciphers, i);
          if (!ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED)) {
              if (!sk)
                  sk = sk_SSL_CIPHER_new_null();
              if (!sk)
                  return NULL;
              if (!sk_SSL_CIPHER_push(sk, c)) {
                  sk_SSL_CIPHER_free(sk);
                  return NULL;
              }
          }
      }
      return sk;
  }
  
  /** return a STACK of the ciphers available for the SSL and in order of
   * algorithm id */
  STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
  {
      if (s != NULL) {
          if (s->cipher_list_by_id != NULL) {
              return (s->cipher_list_by_id);
          } else if ((s->ctx != NULL) && (s->ctx->cipher_list_by_id != NULL)) {
              return (s->ctx->cipher_list_by_id);
          }
      }
      return (NULL);
  }
  
  /** The old interface to get the same thing as SSL_get_ciphers() */
  const char *SSL_get_cipher_list(const SSL *s, int n)
  {
      const SSL_CIPHER *c;
      STACK_OF(SSL_CIPHER) *sk;
  
      if (s == NULL)
          return (NULL);
      sk = SSL_get_ciphers(s);
      if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
          return (NULL);
      c = sk_SSL_CIPHER_value(sk, n);
      if (c == NULL)
          return (NULL);
      return (c->name);
  }
  
  /** return a STACK of the ciphers available for the SSL_CTX and in order of
   * preference */
  STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx)
  {
      if (ctx != NULL)
          return ctx->cipher_list;
      return NULL;
  }
  
  /** specify the ciphers to be used by default by the SSL_CTX */
  int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
  {
      STACK_OF(SSL_CIPHER) *sk;
  
      sk = ssl_create_cipher_list(ctx->method, &ctx->cipher_list,
                                  &ctx->cipher_list_by_id, str, ctx->cert);
      /*
       * ssl_create_cipher_list may return an empty stack if it was unable to
       * find a cipher matching the given rule string (for example if the rule
       * string specifies a cipher which has been disabled). This is not an
       * error as far as ssl_create_cipher_list is concerned, and hence
       * ctx->cipher_list and ctx->cipher_list_by_id has been updated.
       */
      if (sk == NULL)
          return 0;
      else if (sk_SSL_CIPHER_num(sk) == 0) {
          SSLerr(SSL_F_SSL_CTX_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
          return 0;
      }
      return 1;
  }
  
  /** specify the ciphers to be used by the SSL */
  int SSL_set_cipher_list(SSL *s, const char *str)
  {
      STACK_OF(SSL_CIPHER) *sk;
  
      sk = ssl_create_cipher_list(s->ctx->method, &s->cipher_list,
                                  &s->cipher_list_by_id, str, s->cert);
      /* see comment in SSL_CTX_set_cipher_list */
      if (sk == NULL)
          return 0;
      else if (sk_SSL_CIPHER_num(sk) == 0) {
          SSLerr(SSL_F_SSL_SET_CIPHER_LIST, SSL_R_NO_CIPHER_MATCH);
          return 0;
      }
      return 1;
  }
  
  char *SSL_get_shared_ciphers(const SSL *s, char *buf, int len)
  {
      char *p;
      STACK_OF(SSL_CIPHER) *sk;
      const SSL_CIPHER *c;
      int i;
  
      if ((s->session == NULL) || (s->session->ciphers == NULL) || (len < 2))
          return (NULL);
  
      p = buf;
      sk = s->session->ciphers;
  
      if (sk_SSL_CIPHER_num(sk) == 0)
          return NULL;
  
      for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
          int n;
  
          c = sk_SSL_CIPHER_value(sk, i);
          n = strlen(c->name);
          if (n + 1 > len) {
              if (p != buf)
                  --p;
              *p = '\0';
              return buf;
          }
          memcpy(p, c->name, n + 1);
          p += n;
          *(p++) = ':';
          len -= n + 1;
      }
      p[-1] = '\0';
      return (buf);
  }
  
  /** return a servername extension value if provided in Client Hello, or NULL.
   * So far, only host_name types are defined (RFC 3546).
   */
  
  const char *SSL_get_servername(const SSL *s, const int type)
  {
      if (type != TLSEXT_NAMETYPE_host_name)
          return NULL;
  
      return s->session && !s->tlsext_hostname ?
          s->session->tlsext_hostname : s->tlsext_hostname;
  }
  
  int SSL_get_servername_type(const SSL *s)
  {
      if (s->session
          && (!s->tlsext_hostname ? s->session->
              tlsext_hostname : s->tlsext_hostname))
          return TLSEXT_NAMETYPE_host_name;
      return -1;
  }
  
  /*
   * SSL_select_next_proto implements the standard protocol selection. It is
   * expected that this function is called from the callback set by
   * SSL_CTX_set_next_proto_select_cb. The protocol data is assumed to be a
   * vector of 8-bit, length prefixed byte strings. The length byte itself is
   * not included in the length. A byte string of length 0 is invalid. No byte
   * string may be truncated. The current, but experimental algorithm for
   * selecting the protocol is: 1) If the server doesn't support NPN then this
   * is indicated to the callback. In this case, the client application has to
   * abort the connection or have a default application level protocol. 2) If
   * the server supports NPN, but advertises an empty list then the client
   * selects the first protcol in its list, but indicates via the API that this
   * fallback case was enacted. 3) Otherwise, the client finds the first
   * protocol in the server's list that it supports and selects this protocol.
   * This is because it's assumed that the server has better information about
   * which protocol a client should use. 4) If the client doesn't support any
   * of the server's advertised protocols, then this is treated the same as
   * case 2. It returns either OPENSSL_NPN_NEGOTIATED if a common protocol was
   * found, or OPENSSL_NPN_NO_OVERLAP if the fallback case was reached.
   */
  int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
                            const unsigned char *server,
                            unsigned int server_len,
                            const unsigned char *client,
                            unsigned int client_len)
  {
      unsigned int i, j;
      const unsigned char *result;
      int status = OPENSSL_NPN_UNSUPPORTED;
  
      /*
       * For each protocol in server preference order, see if we support it.
       */
      for (i = 0; i < server_len;) {
          for (j = 0; j < client_len;) {
              if (server[i] == client[j] &&
                  memcmp(&server[i + 1], &client[j + 1], server[i]) == 0) {
                  /* We found a match */
                  result = &server[i];
                  status = OPENSSL_NPN_NEGOTIATED;
                  goto found;
              }
              j += client[j];
              j++;
          }
          i += server[i];
          i++;
      }
  
      /* There's no overlap between our protocols and the server's list. */
      result = client;
      status = OPENSSL_NPN_NO_OVERLAP;
  
   found:
      *out = (unsigned char *)result + 1;
      *outlen = result[0];
      return status;
  }
  
  #ifndef OPENSSL_NO_NEXTPROTONEG
  /*
   * SSL_get0_next_proto_negotiated sets *data and *len to point to the
   * client's requested protocol for this connection and returns 0. If the
   * client didn't request any protocol, then *data is set to NULL. Note that
   * the client can request any protocol it chooses. The value returned from
   * this function need not be a member of the list of supported protocols
   * provided by the callback.
   */
  void SSL_get0_next_proto_negotiated(const SSL *s, const unsigned char **data,
                                      unsigned *len)
  {
      *data = s->next_proto_negotiated;
      if (!*data) {
          *len = 0;
      } else {
          *len = s->next_proto_negotiated_len;
      }
  }
  
  /*
   * SSL_CTX_set_next_protos_advertised_cb sets a callback that is called when
   * a TLS server needs a list of supported protocols for Next Protocol
   * Negotiation. The returned list must be in wire format.  The list is
   * returned by setting |out| to point to it and |outlen| to its length. This
   * memory will not be modified, but one should assume that the SSL* keeps a
   * reference to it. The callback should return SSL_TLSEXT_ERR_OK if it
   * wishes to advertise. Otherwise, no such extension will be included in the
   * ServerHello.
   */
  void SSL_CTX_set_next_protos_advertised_cb(SSL_CTX *ctx,
                                             int (*cb) (SSL *ssl,
                                                        const unsigned char
                                                        **out,
                                                        unsigned int *outlen,
                                                        void *arg), void *arg)
  {
      ctx->next_protos_advertised_cb = cb;
      ctx->next_protos_advertised_cb_arg = arg;
  }
  
  /*
   * SSL_CTX_set_next_proto_select_cb sets a callback that is called when a
   * client needs to select a protocol from the server's provided list. |out|
   * must be set to point to the selected protocol (which may be within |in|).
   * The length of the protocol name must be written into |outlen|. The
   * server's advertised protocols are provided in |in| and |inlen|. The
   * callback can assume that |in| is syntactically valid. The client must
   * select a protocol. It is fatal to the connection if this callback returns
   * a value other than SSL_TLSEXT_ERR_OK.
   */
  void SSL_CTX_set_next_proto_select_cb(SSL_CTX *ctx,
                                        int (*cb) (SSL *s, unsigned char **out,
                                                   unsigned char *outlen,
                                                   const unsigned char *in,
                                                   unsigned int inlen,
                                                   void *arg), void *arg)
  {
      ctx->next_proto_select_cb = cb;
      ctx->next_proto_select_cb_arg = arg;
  }
  #endif
  
  /*
   * SSL_CTX_set_alpn_protos sets the ALPN protocol list on |ctx| to |protos|.
   * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
   * length-prefixed strings). Returns 0 on success.
   */
  int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos,
                              unsigned int protos_len)
  {
      OPENSSL_free(ctx->alpn_client_proto_list);
      ctx->alpn_client_proto_list = OPENSSL_memdup(protos, protos_len);
      if (ctx->alpn_client_proto_list == NULL) {
          SSLerr(SSL_F_SSL_CTX_SET_ALPN_PROTOS, ERR_R_MALLOC_FAILURE);
          return 1;
      }
      ctx->alpn_client_proto_list_len = protos_len;
  
      return 0;
  }
  
  /*
   * SSL_set_alpn_protos sets the ALPN protocol list on |ssl| to |protos|.
   * |protos| must be in wire-format (i.e. a series of non-empty, 8-bit
   * length-prefixed strings). Returns 0 on success.
   */
  int SSL_set_alpn_protos(SSL *ssl, const unsigned char *protos,
                          unsigned int protos_len)
  {
      OPENSSL_free(ssl->alpn_client_proto_list);
      ssl->alpn_client_proto_list = OPENSSL_memdup(protos, protos_len);
      if (ssl->alpn_client_proto_list == NULL) {
          SSLerr(SSL_F_SSL_SET_ALPN_PROTOS, ERR_R_MALLOC_FAILURE);
          return 1;
      }
      ssl->alpn_client_proto_list_len = protos_len;
  
      return 0;
  }
  
  /*
   * SSL_CTX_set_alpn_select_cb sets a callback function on |ctx| that is
   * called during ClientHello processing in order to select an ALPN protocol
   * from the client's list of offered protocols.
   */
  void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
                                  int (*cb) (SSL *ssl,
                                             const unsigned char **out,
                                             unsigned char *outlen,
                                             const unsigned char *in,
                                             unsigned int inlen,
                                             void *arg), void *arg)
  {
      ctx->alpn_select_cb = cb;
      ctx->alpn_select_cb_arg = arg;
  }
  
  /*
   * SSL_get0_alpn_selected gets the selected ALPN protocol (if any) from
   * |ssl|. On return it sets |*data| to point to |*len| bytes of protocol name
   * (not including the leading length-prefix byte). If the server didn't
   * respond with a negotiated protocol then |*len| will be zero.
   */
  void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
                              unsigned int *len)
  {
      *data = NULL;
      if (ssl->s3)
          *data = ssl->s3->alpn_selected;
      if (*data == NULL)
          *len = 0;
      else
          *len = ssl->s3->alpn_selected_len;
  }
  
  
  int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
                                 const char *label, size_t llen,
                                 const unsigned char *p, size_t plen,
                                 int use_context)
  {
      if (s->version < TLS1_VERSION)
          return -1;
  
      return s->method->ssl3_enc->export_keying_material(s, out, olen, label,
                                                         llen, p, plen,
                                                         use_context);
  }
  
  static unsigned long ssl_session_hash(const SSL_SESSION *a)
  {
      unsigned long l;
  
      l = (unsigned long)
          ((unsigned int)a->session_id[0]) |
          ((unsigned int)a->session_id[1] << 8L) |
          ((unsigned long)a->session_id[2] << 16L) |
          ((unsigned long)a->session_id[3] << 24L);
      return (l);
  }
  
  /*
   * NB: If this function (or indeed the hash function which uses a sort of
   * coarser function than this one) is changed, ensure
   * SSL_CTX_has_matching_session_id() is checked accordingly. It relies on
   * being able to construct an SSL_SESSION that will collide with any existing
   * session with a matching session ID.
   */
  static int ssl_session_cmp(const SSL_SESSION *a, const SSL_SESSION *b)
  {
      if (a->ssl_version != b->ssl_version)
          return (1);
      if (a->session_id_length != b->session_id_length)
          return (1);
      return (memcmp(a->session_id, b->session_id, a->session_id_length));
  }
  
  /*
   * These wrapper functions should remain rather than redeclaring
   * SSL_SESSION_hash and SSL_SESSION_cmp for void* types and casting each
   * variable. The reason is that the functions aren't static, they're exposed
   * via ssl.h.
   */
  
  SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
  {
      SSL_CTX *ret = NULL;
  
      if (meth == NULL) {
          SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_NULL_SSL_METHOD_PASSED);
          return (NULL);
      }
  
      if (!OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL))
          return NULL;
  
      if (FIPS_mode() && (meth->version < TLS1_VERSION)) {
          SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_AT_LEAST_TLS_1_0_NEEDED_IN_FIPS_MODE);
          return NULL;
      }
  
      if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0) {
          SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
          goto err;
      }
      ret = OPENSSL_zalloc(sizeof(*ret));
      if (ret == NULL)
          goto err;
  
      ret->method = meth;
      ret->min_proto_version = 0;
      ret->max_proto_version = 0;
      ret->session_cache_mode = SSL_SESS_CACHE_SERVER;
      ret->session_cache_size = SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
      /* We take the system default. */
      ret->session_timeout = meth->get_timeout();
      ret->references = 1;
      ret->lock = CRYPTO_THREAD_lock_new();
      if (ret->lock == NULL) {
          SSLerr(SSL_F_SSL_CTX_NEW, ERR_R_MALLOC_FAILURE);
          OPENSSL_free(ret);
          return NULL;
      }
      ret->max_cert_list = SSL_MAX_CERT_LIST_DEFAULT;
      ret->verify_mode = SSL_VERIFY_NONE;
      if ((ret->cert = ssl_cert_new()) == NULL)
          goto err;
  
      ret->sessions = lh_SSL_SESSION_new(ssl_session_hash, ssl_session_cmp);
      if (ret->sessions == NULL)
          goto err;
      ret->cert_store = X509_STORE_new();
      if (ret->cert_store == NULL)
          goto err;
  #ifndef OPENSSL_NO_CT
      ret->ctlog_store = CTLOG_STORE_new();
      if (ret->ctlog_store == NULL)
          goto err;
  #endif
      if (!ssl_create_cipher_list(ret->method,
                             &ret->cipher_list, &ret->cipher_list_by_id,
                             SSL_DEFAULT_CIPHER_LIST, ret->cert)
         || sk_SSL_CIPHER_num(ret->cipher_list) <= 0) {
          SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_LIBRARY_HAS_NO_CIPHERS);
          goto err2;
      }
  
      ret->param = X509_VERIFY_PARAM_new();
      if (ret->param == NULL)
          goto err;
  
      if ((ret->md5 = EVP_get_digestbyname("ssl3-md5")) == NULL) {
          SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES);
          goto err2;
      }
      if ((ret->sha1 = EVP_get_digestbyname("ssl3-sha1")) == NULL) {
          SSLerr(SSL_F_SSL_CTX_NEW, SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES);
          goto err2;
      }
  
      if ((ret->client_CA = sk_X509_NAME_new_null()) == NULL)
          goto err;
  
      if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_CTX, ret, &ret->ex_data))
          goto err;
  
      /* No compression for DTLS */
      if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS))
          ret->comp_methods = SSL_COMP_get_compression_methods();
  
      ret->max_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
      ret->split_send_fragment = SSL3_RT_MAX_PLAIN_LENGTH;
  
      /* Setup RFC5077 ticket keys */
      if ((RAND_bytes(ret->tlsext_tick_key_name, sizeof(ret->tlsext_tick_key_name)) <= 0)
          || (RAND_bytes(ret->tlsext_tick_hmac_key, sizeof(ret->tlsext_tick_hmac_key)) <= 0)
          || (RAND_bytes(ret->tlsext_tick_aes_key, sizeof(ret->tlsext_tick_aes_key)) <= 0))
          ret->options |= SSL_OP_NO_TICKET;
  
  #ifndef OPENSSL_NO_SRP
      if (!SSL_CTX_SRP_CTX_init(ret))
          goto err;
  #endif
  #ifndef OPENSSL_NO_ENGINE
  # ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
  #  define eng_strx(x)     #x
  #  define eng_str(x)      eng_strx(x)
      /* Use specific client engine automatically... ignore errors */
      {
          ENGINE *eng;
          eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
          if (!eng) {
              ERR_clear_error();
              ENGINE_load_builtin_engines();
              eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
          }
          if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
              ERR_clear_error();
      }
  # endif
  #endif
      /*
       * Default is to connect to non-RI servers. When RI is more widely
       * deployed might change this.
       */
      ret->options |= SSL_OP_LEGACY_SERVER_CONNECT;
      /*
       * Disable compression by default to prevent CRIME. Applications can
       * re-enable compression by configuring
       * SSL_CTX_clear_options(ctx, SSL_OP_NO_COMPRESSION);
       * or by using the SSL_CONF library.
       */
      ret->options |= SSL_OP_NO_COMPRESSION;
  
      ret->tlsext_status_type = -1;
  
      return ret;
   err:
      SSLerr(SSL_F_SSL_CTX_NEW, ERR_R_MALLOC_FAILURE);
   err2:
      SSL_CTX_free(ret);
      return NULL;
  }
  
  int SSL_CTX_up_ref(SSL_CTX *ctx)
  {
      int i;
  
      if (CRYPTO_atomic_add(&ctx->references, 1, &i, ctx->lock) <= 0)
          return 0;
  
      REF_PRINT_COUNT("SSL_CTX", ctx);
      REF_ASSERT_ISNT(i < 2);
      return ((i > 1) ? 1 : 0);
  }
  
  void SSL_CTX_free(SSL_CTX *a)
  {
      int i;
  
      if (a == NULL)
          return;
  
      CRYPTO_atomic_add(&a->references, -1, &i, a->lock);
      REF_PRINT_COUNT("SSL_CTX", a);
      if (i > 0)
          return;
      REF_ASSERT_ISNT(i < 0);
  
      X509_VERIFY_PARAM_free(a->param);
      dane_ctx_final(&a->dane);
  
      /*
       * Free internal session cache. However: the remove_cb() may reference
       * the ex_data of SSL_CTX, thus the ex_data store can only be removed
       * after the sessions were flushed.
       * As the ex_data handling routines might also touch the session cache,
       * the most secure solution seems to be: empty (flush) the cache, then
       * free ex_data, then finally free the cache.
       * (See ticket [openssl.org #212].)
       */
      if (a->sessions != NULL)
          SSL_CTX_flush_sessions(a, 0);
  
      CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_CTX, a, &a->ex_data);
      lh_SSL_SESSION_free(a->sessions);
      X509_STORE_free(a->cert_store);
  #ifndef OPENSSL_NO_CT
      CTLOG_STORE_free(a->ctlog_store);
  #endif
      sk_SSL_CIPHER_free(a->cipher_list);
      sk_SSL_CIPHER_free(a->cipher_list_by_id);
      ssl_cert_free(a->cert);
      sk_X509_NAME_pop_free(a->client_CA, X509_NAME_free);
      sk_X509_pop_free(a->extra_certs, X509_free);
      a->comp_methods = NULL;
  #ifndef OPENSSL_NO_SRTP
      sk_SRTP_PROTECTION_PROFILE_free(a->srtp_profiles);
  #endif
  #ifndef OPENSSL_NO_SRP
      SSL_CTX_SRP_CTX_free(a);
  #endif
  #ifndef OPENSSL_NO_ENGINE
      ENGINE_finish(a->client_cert_engine);
  #endif
  
  #ifndef OPENSSL_NO_EC
      OPENSSL_free(a->tlsext_ecpointformatlist);
      OPENSSL_free(a->tlsext_ellipticcurvelist);
  #endif
      OPENSSL_free(a->alpn_client_proto_list);
  
      CRYPTO_THREAD_lock_free(a->lock);
  
      OPENSSL_free(a);
  }
  
  void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
  {
      ctx->default_passwd_callback = cb;
  }
  
  void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx, void *u)
  {
      ctx->default_passwd_callback_userdata = u;
  }
  
  pem_password_cb *SSL_CTX_get_default_passwd_cb(SSL_CTX *ctx)
  {
      return ctx->default_passwd_callback;
  }
  
  void *SSL_CTX_get_default_passwd_cb_userdata(SSL_CTX *ctx)
  {
      return ctx->default_passwd_callback_userdata;
  }
  
  void SSL_set_default_passwd_cb(SSL *s, pem_password_cb *cb)
  {
      s->default_passwd_callback = cb;
  }
  
  void SSL_set_default_passwd_cb_userdata(SSL *s, void *u)
  {
      s->default_passwd_callback_userdata = u;
  }
  
  pem_password_cb *SSL_get_default_passwd_cb(SSL *s)
  {
      return s->default_passwd_callback;
  }
  
  void *SSL_get_default_passwd_cb_userdata(SSL *s)
  {
      return s->default_passwd_callback_userdata;
  }
  
  void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,
                                        int (*cb) (X509_STORE_CTX *, void *),
                                        void *arg)
  {
      ctx->app_verify_callback = cb;
      ctx->app_verify_arg = arg;
  }
  
  void SSL_CTX_set_verify(SSL_CTX *ctx, int mode,
                          int (*cb) (int, X509_STORE_CTX *))
  {
      ctx->verify_mode = mode;
      ctx->default_verify_callback = cb;
  }
  
  void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth)
  {
      X509_VERIFY_PARAM_set_depth(ctx->param, depth);
  }
  
  void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cb) (SSL *ssl, void *arg),
                           void *arg)
  {
      ssl_cert_set_cert_cb(c->cert, cb, arg);
  }
  
  void SSL_set_cert_cb(SSL *s, int (*cb) (SSL *ssl, void *arg), void *arg)
  {
      ssl_cert_set_cert_cb(s->cert, cb, arg);
  }
  
  void ssl_set_masks(SSL *s)
  {
  #if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_GOST)
      CERT_PKEY *cpk;
  #endif
      CERT *c = s->cert;
      uint32_t *pvalid = s->s3->tmp.valid_flags;
      int rsa_enc, rsa_sign, dh_tmp, dsa_sign;
      unsigned long mask_k, mask_a;
  #ifndef OPENSSL_NO_EC
      int have_ecc_cert, ecdsa_ok;
      X509 *x = NULL;
  #endif
      if (c == NULL)
          return;
  
  #ifndef OPENSSL_NO_DH
      dh_tmp = (c->dh_tmp != NULL || c->dh_tmp_cb != NULL || c->dh_tmp_auto);
  #else
      dh_tmp = 0;
  #endif
  
      rsa_enc = pvalid[SSL_PKEY_RSA_ENC] & CERT_PKEY_VALID;
      rsa_sign = pvalid[SSL_PKEY_RSA_SIGN] & CERT_PKEY_SIGN;
      dsa_sign = pvalid[SSL_PKEY_DSA_SIGN] & CERT_PKEY_SIGN;
  #ifndef OPENSSL_NO_EC
      have_ecc_cert = pvalid[SSL_PKEY_ECC] & CERT_PKEY_VALID;
  #endif
      mask_k = 0;
      mask_a = 0;
  
  #ifdef CIPHER_DEBUG
      fprintf(stderr, "dht=%d re=%d rs=%d ds=%d\n",
              dh_tmp, rsa_enc, rsa_sign, dsa_sign);
  #endif
  
  #ifndef OPENSSL_NO_GOST
      cpk = &(c->pkeys[SSL_PKEY_GOST12_512]);
      if (cpk->x509 != NULL && cpk->privatekey != NULL) {
          mask_k |= SSL_kGOST;
          mask_a |= SSL_aGOST12;
      }
      cpk = &(c->pkeys[SSL_PKEY_GOST12_256]);
      if (cpk->x509 != NULL && cpk->privatekey != NULL) {
          mask_k |= SSL_kGOST;
          mask_a |= SSL_aGOST12;
      }
      cpk = &(c->pkeys[SSL_PKEY_GOST01]);
      if (cpk->x509 != NULL && cpk->privatekey != NULL) {
          mask_k |= SSL_kGOST;
          mask_a |= SSL_aGOST01;
      }
  #endif
  
      if (rsa_enc)
          mask_k |= SSL_kRSA;
  
      if (dh_tmp)
          mask_k |= SSL_kDHE;
  
      if (rsa_enc || rsa_sign) {
          mask_a |= SSL_aRSA;
      }
  
      if (dsa_sign) {
          mask_a |= SSL_aDSS;
      }
  
      mask_a |= SSL_aNULL;
  
      /*
       * An ECC certificate may be usable for ECDH and/or ECDSA cipher suites
       * depending on the key usage extension.
       */
  #ifndef OPENSSL_NO_EC
      if (have_ecc_cert) {
          uint32_t ex_kusage;
          cpk = &c->pkeys[SSL_PKEY_ECC];
          x = cpk->x509;
          ex_kusage = X509_get_key_usage(x);
          ecdsa_ok = ex_kusage & X509v3_KU_DIGITAL_SIGNATURE;
          if (!(pvalid[SSL_PKEY_ECC] & CERT_PKEY_SIGN))
              ecdsa_ok = 0;
          if (ecdsa_ok)
              mask_a |= SSL_aECDSA;
      }
  #endif
  
  #ifndef OPENSSL_NO_EC
      mask_k |= SSL_kECDHE;
  #endif
  
  #ifndef OPENSSL_NO_PSK
      mask_k |= SSL_kPSK;
      mask_a |= SSL_aPSK;
      if (mask_k & SSL_kRSA)
          mask_k |= SSL_kRSAPSK;
      if (mask_k & SSL_kDHE)
          mask_k |= SSL_kDHEPSK;
      if (mask_k & SSL_kECDHE)
          mask_k |= SSL_kECDHEPSK;
  #endif
  
      s->s3->tmp.mask_k = mask_k;
      s->s3->tmp.mask_a = mask_a;
  }
  
  #ifndef OPENSSL_NO_EC
  
  int ssl_check_srvr_ecc_cert_and_alg(X509 *x, SSL *s)
  {
      if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aECDSA) {
          /* key usage, if present, must allow signing */
          if (!(X509_get_key_usage(x) & X509v3_KU_DIGITAL_SIGNATURE)) {
              SSLerr(SSL_F_SSL_CHECK_SRVR_ECC_CERT_AND_ALG,
                     SSL_R_ECC_CERT_NOT_FOR_SIGNING);
              return 0;
          }
      }
      return 1;                   /* all checks are ok */
  }
  
  #endif
  
  static int ssl_get_server_cert_index(const SSL *s)
  {
      int idx;
      idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
      if (idx == SSL_PKEY_RSA_ENC && !s->cert->pkeys[SSL_PKEY_RSA_ENC].x509)
          idx = SSL_PKEY_RSA_SIGN;
      if (idx == SSL_PKEY_GOST_EC) {
          if (s->cert->pkeys[SSL_PKEY_GOST12_512].x509)
              idx = SSL_PKEY_GOST12_512;
          else if (s->cert->pkeys[SSL_PKEY_GOST12_256].x509)
              idx = SSL_PKEY_GOST12_256;
          else if (s->cert->pkeys[SSL_PKEY_GOST01].x509)
              idx = SSL_PKEY_GOST01;
          else
              idx = -1;
      }
      if (idx == -1)
          SSLerr(SSL_F_SSL_GET_SERVER_CERT_INDEX, ERR_R_INTERNAL_ERROR);
      return idx;
  }
  
  CERT_PKEY *ssl_get_server_send_pkey(SSL *s)
  {
      CERT *c;
      int i;
  
      c = s->cert;
      if (!s->s3 || !s->s3->tmp.new_cipher)
          return NULL;
      ssl_set_masks(s);
  
      i = ssl_get_server_cert_index(s);
  
      /* This may or may not be an error. */
      if (i < 0)
          return NULL;
  
      /* May be NULL. */
      return &c->pkeys[i];
  }
  
  EVP_PKEY *ssl_get_sign_pkey(SSL *s, const SSL_CIPHER *cipher,
                              const EVP_MD **pmd)
  {
      unsigned long alg_a;
      CERT *c;
      int idx = -1;
  
      alg_a = cipher->algorithm_auth;
      c = s->cert;
  
      if ((alg_a & SSL_aDSS) &&
              (c->pkeys[SSL_PKEY_DSA_SIGN].privatekey != NULL))
          idx = SSL_PKEY_DSA_SIGN;
      else if (alg_a & SSL_aRSA) {
          if (c->pkeys[SSL_PKEY_RSA_SIGN].privatekey != NULL)
              idx = SSL_PKEY_RSA_SIGN;
          else if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey != NULL)
              idx = SSL_PKEY_RSA_ENC;
      } else if ((alg_a & SSL_aECDSA) &&
                 (c->pkeys[SSL_PKEY_ECC].privatekey != NULL))
          idx = SSL_PKEY_ECC;
      if (idx == -1) {
          SSLerr(SSL_F_SSL_GET_SIGN_PKEY, ERR_R_INTERNAL_ERROR);
          return (NULL);
      }
      if (pmd)
          *pmd = s->s3->tmp.md[idx];
      return c->pkeys[idx].privatekey;
  }
  
  int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
                                     size_t *serverinfo_length)
  {
      CERT *c = NULL;
      int i = 0;
      *serverinfo_length = 0;
  
      c = s->cert;
      i = ssl_get_server_cert_index(s);
  
      if (i == -1)
          return 0;
      if (c->pkeys[i].serverinfo == NULL)
          return 0;
  
      *serverinfo = c->pkeys[i].serverinfo;
      *serverinfo_length = c->pkeys[i].serverinfo_length;
      return 1;
  }
  
  void ssl_update_cache(SSL *s, int mode)
  {
      int i;
  
      /*
       * If the session_id_length is 0, we are not supposed to cache it, and it
       * would be rather hard to do anyway :-)
       */
      if (s->session->session_id_length == 0)
          return;
  
      i = s->session_ctx->session_cache_mode;
      if ((i & mode) && (!s->hit)
          && ((i & SSL_SESS_CACHE_NO_INTERNAL_STORE)
              || SSL_CTX_add_session(s->session_ctx, s->session))
          && (s->session_ctx->new_session_cb != NULL)) {
          SSL_SESSION_up_ref(s->session);
          if (!s->session_ctx->new_session_cb(s, s->session))
              SSL_SESSION_free(s->session);
      }
  
      /* auto flush every 255 connections */
      if ((!(i & SSL_SESS_CACHE_NO_AUTO_CLEAR)) && ((i & mode) == mode)) {
          if ((((mode & SSL_SESS_CACHE_CLIENT)
                ? s->session_ctx->stats.sess_connect_good
                : s->session_ctx->stats.sess_accept_good) & 0xff) == 0xff) {
              SSL_CTX_flush_sessions(s->session_ctx, (unsigned long)time(NULL));
          }
      }
  }
  
  const SSL_METHOD *SSL_CTX_get_ssl_method(SSL_CTX *ctx)
  {
      return ctx->method;
  }
  
  const SSL_METHOD *SSL_get_ssl_method(SSL *s)
  {
      return (s->method);
  }
  
  int SSL_set_ssl_method(SSL *s, const SSL_METHOD *meth)
  {
      int ret = 1;
  
      if (s->method != meth) {
          const SSL_METHOD *sm = s->method;
          int (*hf)(SSL *) = s->handshake_func;
  
          if (sm->version == meth->version)
              s->method = meth;
          else {
              sm->ssl_free(s);
              s->method = meth;
              ret = s->method->ssl_new(s);
          }
  
          if (hf == sm->ssl_connect)
              s->handshake_func = meth->ssl_connect;
          else if (hf == sm->ssl_accept)
              s->handshake_func = meth->ssl_accept;
      }
      return (ret);
  }
  
  int SSL_get_error(const SSL *s, int i)
  {
      int reason;
      unsigned long l;
      BIO *bio;
  
      if (i > 0)
          return (SSL_ERROR_NONE);
  
      /*
       * Make things return SSL_ERROR_SYSCALL when doing SSL_do_handshake etc,
       * where we do encode the error
       */
      if ((l = ERR_peek_error()) != 0) {
          if (ERR_GET_LIB(l) == ERR_LIB_SYS)
              return (SSL_ERROR_SYSCALL);
          else
              return (SSL_ERROR_SSL);
      }
  
      if (i < 0) {
          if (SSL_want_read(s)) {
              bio = SSL_get_rbio(s);
              if (BIO_should_read(bio))
                  return (SSL_ERROR_WANT_READ);
              else if (BIO_should_write(bio))
                  /*
                   * This one doesn't make too much sense ... We never try to write
                   * to the rbio, and an application program where rbio and wbio
                   * are separate couldn't even know what it should wait for.
                   * However if we ever set s->rwstate incorrectly (so that we have
                   * SSL_want_read(s) instead of SSL_want_write(s)) and rbio and
                   * wbio *are* the same, this test works around that bug; so it
                   * might be safer to keep it.
                   */
                  return (SSL_ERROR_WANT_WRITE);
              else if (BIO_should_io_special(bio)) {
                  reason = BIO_get_retry_reason(bio);
                  if (reason == BIO_RR_CONNECT)
                      return (SSL_ERROR_WANT_CONNECT);
                  else if (reason == BIO_RR_ACCEPT)
                      return (SSL_ERROR_WANT_ACCEPT);
                  else
                      return (SSL_ERROR_SYSCALL); /* unknown */
              }
          }
  
          if (SSL_want_write(s)) {
              bio = SSL_get_wbio(s);
              if (BIO_should_write(bio))
                  return (SSL_ERROR_WANT_WRITE);
              else if (BIO_should_read(bio))
                  /*
                   * See above (SSL_want_read(s) with BIO_should_write(bio))
                   */
                  return (SSL_ERROR_WANT_READ);
              else if (BIO_should_io_special(bio)) {
                  reason = BIO_get_retry_reason(bio);
                  if (reason == BIO_RR_CONNECT)
                      return (SSL_ERROR_WANT_CONNECT);
                  else if (reason == BIO_RR_ACCEPT)
                      return (SSL_ERROR_WANT_ACCEPT);
                  else
                      return (SSL_ERROR_SYSCALL);
              }
          }
          if (SSL_want_x509_lookup(s)) {
              return (SSL_ERROR_WANT_X509_LOOKUP);
          }
          if (SSL_want_async(s)) {
              return SSL_ERROR_WANT_ASYNC;
          }
          if (SSL_want_async_job(s)) {
              return SSL_ERROR_WANT_ASYNC_JOB;
          }
      }
  
      if (i == 0) {
          if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
              (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
              return (SSL_ERROR_ZERO_RETURN);
      }
      return (SSL_ERROR_SYSCALL);
  }
  
  static int ssl_do_handshake_intern(void *vargs)
  {
      struct ssl_async_args *args;
      SSL *s;
  
      args = (struct ssl_async_args *)vargs;
      s = args->s;
  
      return s->handshake_func(s);
  }
  
  int SSL_do_handshake(SSL *s)
  {
      int ret = 1;
  
      if (s->handshake_func == NULL) {
          SSLerr(SSL_F_SSL_DO_HANDSHAKE, SSL_R_CONNECTION_TYPE_NOT_SET);
          return -1;
      }
  
      s->method->ssl_renegotiate_check(s);
  
      if (SSL_in_init(s) || SSL_in_before(s)) {
          if((s->mode & SSL_MODE_ASYNC) && ASYNC_get_current_job() == NULL) {
              struct ssl_async_args args;
  
              args.s = s;
  
              ret = ssl_start_async_job(s, &args, ssl_do_handshake_intern);
          } else {
              ret = s->handshake_func(s);
          }
      }
      return ret;
  }
  
  void SSL_set_accept_state(SSL *s)
  {
      s->server = 1;
      s->shutdown = 0;
      ossl_statem_clear(s);
      s->handshake_func = s->method->ssl_accept;
      clear_ciphers(s);
  }
  
  void SSL_set_connect_state(SSL *s)
  {
      s->server = 0;
      s->shutdown = 0;
      ossl_statem_clear(s);
      s->handshake_func = s->method->ssl_connect;
      clear_ciphers(s);
  }
  
  int ssl_undefined_function(SSL *s)
  {
      SSLerr(SSL_F_SSL_UNDEFINED_FUNCTION, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
      return (0);
  }
  
  int ssl_undefined_void_function(void)
  {
      SSLerr(SSL_F_SSL_UNDEFINED_VOID_FUNCTION,
             ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
      return (0);
  }
  
  int ssl_undefined_const_function(const SSL *s)
  {
      return (0);
  }
  
  const SSL_METHOD *ssl_bad_method(int ver)
  {
      SSLerr(SSL_F_SSL_BAD_METHOD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
      return (NULL);
  }
  
  const char *ssl_protocol_to_string(int version)
  {
      if (version == TLS1_2_VERSION)
          return "TLSv1.2";
      else if (version == TLS1_1_VERSION)
          return "TLSv1.1";
      else if (version == TLS1_VERSION)
          return "TLSv1";
      else if (version == SSL3_VERSION)
          return "SSLv3";
      else if (version == DTLS1_BAD_VER)
          return "DTLSv0.9";
      else if (version == DTLS1_VERSION)
          return "DTLSv1";
      else if (version == DTLS1_2_VERSION)
          return "DTLSv1.2";
      else
          return ("unknown");
  }
  
  const char *SSL_get_version(const SSL *s)
  {
      return ssl_protocol_to_string(s->version);
  }
  
  SSL *SSL_dup(SSL *s)
  {
      STACK_OF(X509_NAME) *sk;
      X509_NAME *xn;
      SSL *ret;
      int i;
  
      /* If we're not quiescent, just up_ref! */
      if (!SSL_in_init(s) || !SSL_in_before(s)) {
          CRYPTO_atomic_add(&s->references, 1, &i, s->lock);
          return s;
      }
  
      /*
       * Otherwise, copy configuration state, and session if set.
       */
      if ((ret = SSL_new(SSL_get_SSL_CTX(s))) == NULL)
          return (NULL);
  
      if (s->session != NULL) {
          /*
           * Arranges to share the same session via up_ref.  This "copies"
           * session-id, SSL_METHOD, sid_ctx, and 'cert'
           */
          if (!SSL_copy_session_id(ret, s))
              goto err;
      } else {
          /*
           * No session has been established yet, so we have to expect that
           * s->cert or ret->cert will be changed later -- they should not both
           * point to the same object, and thus we can't use
           * SSL_copy_session_id.
           */
          if (!SSL_set_ssl_method(ret, s->method))
              goto err;
  
          if (s->cert != NULL) {
              ssl_cert_free(ret->cert);
              ret->cert = ssl_cert_dup(s->cert);
              if (ret->cert == NULL)
                  goto err;
          }
  
          if (!SSL_set_session_id_context(ret, s->sid_ctx, s->sid_ctx_length))
              goto err;
      }
  
      if (!ssl_dane_dup(ret, s))
          goto err;
      ret->version = s->version;
      ret->options = s->options;
      ret->mode = s->mode;
      SSL_set_max_cert_list(ret, SSL_get_max_cert_list(s));
      SSL_set_read_ahead(ret, SSL_get_read_ahead(s));
      ret->msg_callback = s->msg_callback;
      ret->msg_callback_arg = s->msg_callback_arg;
      SSL_set_verify(ret, SSL_get_verify_mode(s), SSL_get_verify_callback(s));
      SSL_set_verify_depth(ret, SSL_get_verify_depth(s));
      ret->generate_session_id = s->generate_session_id;
  
      SSL_set_info_callback(ret, SSL_get_info_callback(s));
  
      /* copy app data, a little dangerous perhaps */
      if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL, &ret->ex_data, &s->ex_data))
          goto err;
  
      /* setup rbio, and wbio */
      if (s->rbio != NULL) {
          if (!BIO_dup_state(s->rbio, (char *)&ret->rbio))
              goto err;
      }
      if (s->wbio != NULL) {
          if (s->wbio != s->rbio) {
              if (!BIO_dup_state(s->wbio, (char *)&ret->wbio))
                  goto err;
          } else
              ret->wbio = ret->rbio;
      }
  
      ret->server = s->server;
      if (s->handshake_func) {
          if (s->server)
              SSL_set_accept_state(ret);
          else
              SSL_set_connect_state(ret);
      }
      ret->shutdown = s->shutdown;
      ret->hit = s->hit;
  
      ret->default_passwd_callback = s->default_passwd_callback;
      ret->default_passwd_callback_userdata = s->default_passwd_callback_userdata;
  
      X509_VERIFY_PARAM_inherit(ret->param, s->param);
  
      /* dup the cipher_list and cipher_list_by_id stacks */
      if (s->cipher_list != NULL) {
          if ((ret->cipher_list = sk_SSL_CIPHER_dup(s->cipher_list)) == NULL)
              goto err;
      }
      if (s->cipher_list_by_id != NULL)
          if ((ret->cipher_list_by_id = sk_SSL_CIPHER_dup(s->cipher_list_by_id))
              == NULL)
              goto err;
  
      /* Dup the client_CA list */
      if (s->client_CA != NULL) {
          if ((sk = sk_X509_NAME_dup(s->client_CA)) == NULL)
              goto err;
          ret->client_CA = sk;
          for (i = 0; i < sk_X509_NAME_num(sk); i++) {
              xn = sk_X509_NAME_value(sk, i);
              if (sk_X509_NAME_set(sk, i, X509_NAME_dup(xn)) == NULL) {
                  X509_NAME_free(xn);
                  goto err;
              }
          }
      }
      return ret;
  
   err:
      SSL_free(ret);
      return NULL;
  }
  
  void ssl_clear_cipher_ctx(SSL *s)
  {
      if (s->enc_read_ctx != NULL) {
          EVP_CIPHER_CTX_free(s->enc_read_ctx);
          s->enc_read_ctx = NULL;
      }
      if (s->enc_write_ctx != NULL) {
          EVP_CIPHER_CTX_free(s->enc_write_ctx);
          s->enc_write_ctx = NULL;
      }
  #ifndef OPENSSL_NO_COMP
      COMP_CTX_free(s->expand);
      s->expand = NULL;
      COMP_CTX_free(s->compress);
      s->compress = NULL;
  #endif
  }
  
  X509 *SSL_get_certificate(const SSL *s)
  {
      if (s->cert != NULL)
          return (s->cert->key->x509);
      else
          return (NULL);
  }
  
  EVP_PKEY *SSL_get_privatekey(const SSL *s)
  {
      if (s->cert != NULL)
          return (s->cert->key->privatekey);
      else
          return (NULL);
  }
  
  X509 *SSL_CTX_get0_certificate(const SSL_CTX *ctx)
  {
      if (ctx->cert != NULL)
          return ctx->cert->key->x509;
      else
          return NULL;
  }
  
  EVP_PKEY *SSL_CTX_get0_privatekey(const SSL_CTX *ctx)
  {
      if (ctx->cert != NULL)
          return ctx->cert->key->privatekey;
      else
          return NULL;
  }
  
  const SSL_CIPHER *SSL_get_current_cipher(const SSL *s)
  {
      if ((s->session != NULL) && (s->session->cipher != NULL))
          return (s->session->cipher);
      return (NULL);
  }
  
  const COMP_METHOD *SSL_get_current_compression(SSL *s)
  {
  #ifndef OPENSSL_NO_COMP
      return s->compress ? COMP_CTX_get_method(s->compress) : NULL;
  #else
      return NULL;
  #endif
  }
  
  const COMP_METHOD *SSL_get_current_expansion(SSL *s)
  {
  #ifndef OPENSSL_NO_COMP
      return s->expand ? COMP_CTX_get_method(s->expand) : NULL;
  #else
      return NULL;
  #endif
  }
  
  int ssl_init_wbio_buffer(SSL *s)
  {
      BIO *bbio;
  
      if (s->bbio == NULL) {
          bbio = BIO_new(BIO_f_buffer());
          if (bbio == NULL)
              return 0;
          s->bbio = bbio;
          s->wbio = BIO_push(bbio, s->wbio);
      } else {
          bbio = s->bbio;
          (void)BIO_reset(bbio);
      }
  
      if (!BIO_set_read_buffer_size(bbio, 1)) {
          SSLerr(SSL_F_SSL_INIT_WBIO_BUFFER, ERR_R_BUF_LIB);
          return 0;
      }
  
      return 1;
  }
  
  void ssl_free_wbio_buffer(SSL *s)
  {
      /* callers ensure s is never null */
      if (s->bbio == NULL)
          return;
  
      if (s->bbio == s->wbio) {
          /* remove buffering */
          s->wbio = BIO_pop(s->wbio);
          assert(s->wbio != NULL);
      }
      BIO_free(s->bbio);
      s->bbio = NULL;
  }
  
  void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode)
  {
      ctx->quiet_shutdown = mode;
  }
  
  int SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx)
  {
      return (ctx->quiet_shutdown);
  }
  
  void SSL_set_quiet_shutdown(SSL *s, int mode)
  {
      s->quiet_shutdown = mode;
  }
  
  int SSL_get_quiet_shutdown(const SSL *s)
  {
      return (s->quiet_shutdown);
  }
  
  void SSL_set_shutdown(SSL *s, int mode)
  {
      s->shutdown = mode;
  }
  
  int SSL_get_shutdown(const SSL *s)
  {
      return s->shutdown;
  }
  
  int SSL_version(const SSL *s)
  {
      return s->version;
  }
  
  int SSL_client_version(const SSL *s)
  {
      return s->client_version;
  }
  
  SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl)
  {
      return ssl->ctx;
  }
  
  SSL_CTX *SSL_set_SSL_CTX(SSL *ssl, SSL_CTX *ctx)
  {
      CERT *new_cert;
      if (ssl->ctx == ctx)
          return ssl->ctx;
      if (ctx == NULL)
          ctx = ssl->initial_ctx;
      new_cert = ssl_cert_dup(ctx->cert);
      if (new_cert == NULL) {
          return NULL;
      }
      ssl_cert_free(ssl->cert);
      ssl->cert = new_cert;
  
      /*
       * Program invariant: |sid_ctx| has fixed size (SSL_MAX_SID_CTX_LENGTH),
       * so setter APIs must prevent invalid lengths from entering the system.
       */
      OPENSSL_assert(ssl->sid_ctx_length <= sizeof(ssl->sid_ctx));
  
      /*
       * If the session ID context matches that of the parent SSL_CTX,
       * inherit it from the new SSL_CTX as well. If however the context does
       * not match (i.e., it was set per-ssl with SSL_set_session_id_context),
       * leave it unchanged.
       */
      if ((ssl->ctx != NULL) &&
          (ssl->sid_ctx_length == ssl->ctx->sid_ctx_length) &&
          (memcmp(ssl->sid_ctx, ssl->ctx->sid_ctx, ssl->sid_ctx_length) == 0)) {
          ssl->sid_ctx_length = ctx->sid_ctx_length;
          memcpy(&ssl->sid_ctx, &ctx->sid_ctx, sizeof(ssl->sid_ctx));
      }
  
      SSL_CTX_up_ref(ctx);
      SSL_CTX_free(ssl->ctx); /* decrement reference count */
      ssl->ctx = ctx;
  
      return ssl->ctx;
  }
  
  int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
  {
      return (X509_STORE_set_default_paths(ctx->cert_store));
  }
  
  int SSL_CTX_set_default_verify_dir(SSL_CTX *ctx)
  {
      X509_LOOKUP *lookup;
  
      lookup = X509_STORE_add_lookup(ctx->cert_store, X509_LOOKUP_hash_dir());
      if (lookup == NULL)
          return 0;
      X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
  
      /* Clear any errors if the default directory does not exist */
      ERR_clear_error();
  
      return 1;
  }
  
  int SSL_CTX_set_default_verify_file(SSL_CTX *ctx)
  {
      X509_LOOKUP *lookup;
  
      lookup = X509_STORE_add_lookup(ctx->cert_store, X509_LOOKUP_file());
      if (lookup == NULL)
          return 0;
  
      X509_LOOKUP_load_file(lookup, NULL, X509_FILETYPE_DEFAULT);
  
      /* Clear any errors if the default file does not exist */
      ERR_clear_error();
  
      return 1;
  }
  
  int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                                    const char *CApath)
  {
      return (X509_STORE_load_locations(ctx->cert_store, CAfile, CApath));
  }
  
  void SSL_set_info_callback(SSL *ssl,
                             void (*cb) (const SSL *ssl, int type, int val))
  {
      ssl->info_callback = cb;
  }
  
  /*
   * One compiler (Diab DCC) doesn't like argument names in returned function
   * pointer.
   */
  void (*SSL_get_info_callback(const SSL *ssl)) (const SSL * /* ssl */ ,
                                                 int /* type */ ,
                                                 int /* val */ ) {
      return ssl->info_callback;
  }
  
  void SSL_set_verify_result(SSL *ssl, long arg)
  {
      ssl->verify_result = arg;
  }
  
  long SSL_get_verify_result(const SSL *ssl)
  {
      return (ssl->verify_result);
  }
  
  size_t SSL_get_client_random(const SSL *ssl, unsigned char *out, size_t outlen)
  {
      if (outlen == 0)
          return sizeof(ssl->s3->client_random);
      if (outlen > sizeof(ssl->s3->client_random))
          outlen = sizeof(ssl->s3->client_random);
      memcpy(out, ssl->s3->client_random, outlen);
      return outlen;
  }
  
  size_t SSL_get_server_random(const SSL *ssl, unsigned char *out, size_t outlen)
  {
      if (outlen == 0)
          return sizeof(ssl->s3->server_random);
      if (outlen > sizeof(ssl->s3->server_random))
          outlen = sizeof(ssl->s3->server_random);
      memcpy(out, ssl->s3->server_random, outlen);
      return outlen;
  }
  
  size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
                                 unsigned char *out, size_t outlen)
  {
      if (session->master_key_length < 0) {
          /* Should never happen */
          return 0;
      }
      if (outlen == 0)
          return session->master_key_length;
      if (outlen > (size_t)session->master_key_length)
          outlen = session->master_key_length;
      memcpy(out, session->master_key, outlen);
      return outlen;
  }
  
  int SSL_set_ex_data(SSL *s, int idx, void *arg)
  {
      return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
  }
  
  void *SSL_get_ex_data(const SSL *s, int idx)
  {
      return (CRYPTO_get_ex_data(&s->ex_data, idx));
  }
  
  int SSL_CTX_set_ex_data(SSL_CTX *s, int idx, void *arg)
  {
      return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
  }
  
  void *SSL_CTX_get_ex_data(const SSL_CTX *s, int idx)
  {
      return (CRYPTO_get_ex_data(&s->ex_data, idx));
  }
  
  int ssl_ok(SSL *s)
  {
      return (1);
  }
  
  X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx)
  {
      return (ctx->cert_store);
  }
  
  void SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *store)
  {
      X509_STORE_free(ctx->cert_store);
      ctx->cert_store = store;
  }
  
  int SSL_want(const SSL *s)
  {
      return (s->rwstate);
  }
  
  /**
   * \brief Set the callback for generating temporary DH keys.
   * \param ctx the SSL context.
   * \param dh the callback
   */
  
  #ifndef OPENSSL_NO_DH
  void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,
                                   DH *(*dh) (SSL *ssl, int is_export,
                                              int keylength))
  {
      SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
  }
  
  void SSL_set_tmp_dh_callback(SSL *ssl, DH *(*dh) (SSL *ssl, int is_export,
                                                    int keylength))
  {
      SSL_callback_ctrl(ssl, SSL_CTRL_SET_TMP_DH_CB, (void (*)(void))dh);
  }
  #endif
  
  #ifndef OPENSSL_NO_PSK
  int SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char *identity_hint)
  {
      if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
          SSLerr(SSL_F_SSL_CTX_USE_PSK_IDENTITY_HINT,
                 SSL_R_DATA_LENGTH_TOO_LONG);
          return 0;
      }
      OPENSSL_free(ctx->cert->psk_identity_hint);
      if (identity_hint != NULL) {
          ctx->cert->psk_identity_hint = OPENSSL_strdup(identity_hint);
          if (ctx->cert->psk_identity_hint == NULL)
              return 0;
      } else
          ctx->cert->psk_identity_hint = NULL;
      return 1;
  }
  
  int SSL_use_psk_identity_hint(SSL *s, const char *identity_hint)
  {
      if (s == NULL)
          return 0;
  
      if (identity_hint != NULL && strlen(identity_hint) > PSK_MAX_IDENTITY_LEN) {
          SSLerr(SSL_F_SSL_USE_PSK_IDENTITY_HINT, SSL_R_DATA_LENGTH_TOO_LONG);
          return 0;
      }
      OPENSSL_free(s->cert->psk_identity_hint);
      if (identity_hint != NULL) {
          s->cert->psk_identity_hint = OPENSSL_strdup(identity_hint);
          if (s->cert->psk_identity_hint == NULL)
              return 0;
      } else
          s->cert->psk_identity_hint = NULL;
      return 1;
  }
  
  const char *SSL_get_psk_identity_hint(const SSL *s)
  {
      if (s == NULL || s->session == NULL)
          return NULL;
      return (s->session->psk_identity_hint);
  }
  
  const char *SSL_get_psk_identity(const SSL *s)
  {
      if (s == NULL || s->session == NULL)
          return NULL;
      return (s->session->psk_identity);
  }
  
  void SSL_set_psk_client_callback(SSL *s,
                                   unsigned int (*cb) (SSL *ssl,
                                                       const char *hint,
                                                       char *identity,
                                                       unsigned int
                                                       max_identity_len,
                                                       unsigned char *psk,
                                                       unsigned int
                                                       max_psk_len))
  {
      s->psk_client_callback = cb;
  }
  
  void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
                                       unsigned int (*cb) (SSL *ssl,
                                                           const char *hint,
                                                           char *identity,
                                                           unsigned int
                                                           max_identity_len,
                                                           unsigned char *psk,
                                                           unsigned int
                                                           max_psk_len))
  {
      ctx->psk_client_callback = cb;
  }
  
  void SSL_set_psk_server_callback(SSL *s,
                                   unsigned int (*cb) (SSL *ssl,
                                                       const char *identity,
                                                       unsigned char *psk,
                                                       unsigned int
                                                       max_psk_len))
  {
      s->psk_server_callback = cb;
  }
  
  void SSL_CTX_set_psk_server_callback(SSL_CTX *ctx,
                                       unsigned int (*cb) (SSL *ssl,
                                                           const char *identity,
                                                           unsigned char *psk,
                                                           unsigned int
                                                           max_psk_len))
  {
      ctx->psk_server_callback = cb;
  }
  #endif
  
  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))
  {
      SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
  }
  
  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))
  {
      SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
  }
  
  void SSL_CTX_set_not_resumable_session_callback(SSL_CTX *ctx,
                                                  int (*cb) (SSL *ssl,
                                                             int
                                                             is_forward_secure))
  {
      SSL_CTX_callback_ctrl(ctx, SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB,
                            (void (*)(void))cb);
  }
  
  void SSL_set_not_resumable_session_callback(SSL *ssl,
                                              int (*cb) (SSL *ssl,
                                                         int is_forward_secure))
  {
      SSL_callback_ctrl(ssl, SSL_CTRL_SET_NOT_RESUMABLE_SESS_CB,
                        (void (*)(void))cb);
  }
  
  /*
   * Allocates new EVP_MD_CTX and sets pointer to it into given pointer
   * variable, freeing EVP_MD_CTX previously stored in that variable, if any.
   * If EVP_MD pointer is passed, initializes ctx with this md Returns newly
   * allocated ctx;
   */
  
  EVP_MD_CTX *ssl_replace_hash(EVP_MD_CTX **hash, const EVP_MD *md)
  {
      ssl_clear_hash_ctx(hash);
      *hash = EVP_MD_CTX_new();
      if (*hash == NULL || (md && EVP_DigestInit_ex(*hash, md, NULL) <= 0)) {
          EVP_MD_CTX_free(*hash);
          *hash = NULL;
          return NULL;
      }
      return *hash;
  }
  
  void ssl_clear_hash_ctx(EVP_MD_CTX **hash)
  {
  
      if (*hash)
          EVP_MD_CTX_free(*hash);
      *hash = NULL;
  }
  
  /* Retrieve handshake hashes */
  int ssl_handshake_hash(SSL *s, unsigned char *out, int outlen)
  {
      EVP_MD_CTX *ctx = NULL;
      EVP_MD_CTX *hdgst = s->s3->handshake_dgst;
      int ret = EVP_MD_CTX_size(hdgst);
      if (ret < 0 || ret > outlen) {
          ret = 0;
          goto err;
      }
      ctx = EVP_MD_CTX_new();
      if (ctx == NULL) {
          ret = 0;
          goto err;
      }
      if (!EVP_MD_CTX_copy_ex(ctx, hdgst)
          || EVP_DigestFinal_ex(ctx, out, NULL) <= 0)
          ret = 0;
   err:
      EVP_MD_CTX_free(ctx);
      return ret;
  }
  
  int SSL_session_reused(SSL *s)
  {
      return s->hit;
  }
  
  int SSL_is_server(SSL *s)
  {
      return s->server;
  }
  
  #if OPENSSL_API_COMPAT < 0x10100000L
  void SSL_set_debug(SSL *s, int debug)
  {
      /* Old function was do-nothing anyway... */
      (void)s;
      (void)debug;
  }
  #endif
  
  
  void SSL_set_security_level(SSL *s, int level)
  {
      s->cert->sec_level = level;
  }
  
  int SSL_get_security_level(const SSL *s)
  {
      return s->cert->sec_level;
  }
  
  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))
  {
      s->cert->sec_cb = cb;
  }
  
  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) {
      return s->cert->sec_cb;
  }
  
  void SSL_set0_security_ex_data(SSL *s, void *ex)
  {
      s->cert->sec_ex = ex;
  }
  
  void *SSL_get0_security_ex_data(const SSL *s)
  {
      return s->cert->sec_ex;
  }
  
  void SSL_CTX_set_security_level(SSL_CTX *ctx, int level)
  {
      ctx->cert->sec_level = level;
  }
  
  int SSL_CTX_get_security_level(const SSL_CTX *ctx)
  {
      return ctx->cert->sec_level;
  }
  
  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))
  {
      ctx->cert->sec_cb = cb;
  }
  
  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) {
      return ctx->cert->sec_cb;
  }
  
  void SSL_CTX_set0_security_ex_data(SSL_CTX *ctx, void *ex)
  {
      ctx->cert->sec_ex = ex;
  }
  
  void *SSL_CTX_get0_security_ex_data(const SSL_CTX *ctx)
  {
      return ctx->cert->sec_ex;
  }
  
  
  /*
   * Get/Set/Clear options in SSL_CTX or SSL, formerly macros, now functions that
   * can return unsigned long, instead of the generic long return value from the
   * control interface.
   */
  unsigned long SSL_CTX_get_options(const SSL_CTX *ctx)
  {
      return ctx->options;
  }
  unsigned long SSL_get_options(const SSL* s)
  {
      return s->options;
  }
  unsigned long SSL_CTX_set_options(SSL_CTX *ctx, unsigned long op)
  {
      return ctx->options |= op;
  }
  unsigned long SSL_set_options(SSL *s, unsigned long op)
  {
      return s->options |= op;
  }
  unsigned long SSL_CTX_clear_options(SSL_CTX *ctx, unsigned long op)
  {
      return ctx->options &= ~op;
  }
  unsigned long SSL_clear_options(SSL *s, unsigned long op)
  {
      return s->options &= ~op;
  }
  
  STACK_OF(X509) *SSL_get0_verified_chain(const SSL *s)
  {
      return s->verified_chain;
  }
  
  IMPLEMENT_OBJ_BSEARCH_GLOBAL_CMP_FN(SSL_CIPHER, SSL_CIPHER, ssl_cipher_id);
  
  #ifndef OPENSSL_NO_CT
  
  /*
   * Moves SCTs from the |src| stack to the |dst| stack.
   * The source of each SCT will be set to |origin|.
   * If |dst| points to a NULL pointer, a new stack will be created and owned by
   * the caller.
   * Returns the number of SCTs moved, or a negative integer if an error occurs.
   */
  static int ct_move_scts(STACK_OF(SCT) **dst, STACK_OF(SCT) *src, sct_source_t origin)
  {
      int scts_moved = 0;
      SCT *sct = NULL;
  
      if (*dst == NULL) {
          *dst = sk_SCT_new_null();
          if (*dst == NULL) {
              SSLerr(SSL_F_CT_MOVE_SCTS, ERR_R_MALLOC_FAILURE);
              goto err;
          }
      }
  
      while ((sct = sk_SCT_pop(src)) != NULL) {
          if (SCT_set_source(sct, origin) != 1)
              goto err;
  
          if (sk_SCT_push(*dst, sct) <= 0)
              goto err;
          scts_moved += 1;
      }
  
      return scts_moved;
  err:
      if (sct != NULL)
          sk_SCT_push(src, sct); /* Put the SCT back */
      return -1;
  }
  
  /*
  * Look for data collected during ServerHello and parse if found.
  * Return 1 on success, 0 on failure.
  */
  static int ct_extract_tls_extension_scts(SSL *s)
  {
      int scts_extracted = 0;
  
      if (s->tlsext_scts != NULL) {
          const unsigned char *p = s->tlsext_scts;
          STACK_OF(SCT) *scts = o2i_SCT_LIST(NULL, &p, s->tlsext_scts_len);
  
          scts_extracted = ct_move_scts(&s->scts, scts, SCT_SOURCE_TLS_EXTENSION);
  
          SCT_LIST_free(scts);
      }
  
      return scts_extracted;
  }
  
  /*
   * Checks for an OCSP response and then attempts to extract any SCTs found if it
   * contains an SCT X509 extension. They will be stored in |s->scts|.
   * Returns:
   * - The number of SCTs extracted, assuming an OCSP response exists.
   * - 0 if no OCSP response exists or it contains no SCTs.
   * - A negative integer if an error occurs.
   */
  static int ct_extract_ocsp_response_scts(SSL *s)
  {
  #ifndef OPENSSL_NO_OCSP
      int scts_extracted = 0;
      const unsigned char *p;
      OCSP_BASICRESP *br = NULL;
      OCSP_RESPONSE *rsp = NULL;
      STACK_OF(SCT) *scts = NULL;
      int i;
  
      if (s->tlsext_ocsp_resp == NULL || s->tlsext_ocsp_resplen == 0)
          goto err;
  
      p = s->tlsext_ocsp_resp;
      rsp = d2i_OCSP_RESPONSE(NULL, &p, s->tlsext_ocsp_resplen);
      if (rsp == NULL)
          goto err;
  
      br = OCSP_response_get1_basic(rsp);
      if (br == NULL)
          goto err;
  
      for (i = 0; i < OCSP_resp_count(br); ++i) {
          OCSP_SINGLERESP *single = OCSP_resp_get0(br, i);
  
          if (single == NULL)
              continue;
  
          scts = OCSP_SINGLERESP_get1_ext_d2i(single, NID_ct_cert_scts, NULL, NULL);
          scts_extracted = ct_move_scts(&s->scts, scts,
                                        SCT_SOURCE_OCSP_STAPLED_RESPONSE);
          if (scts_extracted < 0)
              goto err;
      }
  err:
      SCT_LIST_free(scts);
      OCSP_BASICRESP_free(br);
      OCSP_RESPONSE_free(rsp);
      return scts_extracted;
  #else
      /* Behave as if no OCSP response exists */
      return 0;
  #endif
  }
  
  /*
   * Attempts to extract SCTs from the peer certificate.
   * Return the number of SCTs extracted, or a negative integer if an error
   * occurs.
   */
  static int ct_extract_x509v3_extension_scts(SSL *s)
  {
      int scts_extracted = 0;
      X509 *cert = s->session != NULL ? s->session->peer : NULL;
  
      if (cert != NULL) {
          STACK_OF(SCT) *scts =
              X509_get_ext_d2i(cert, NID_ct_precert_scts, NULL, NULL);
  
          scts_extracted =
              ct_move_scts(&s->scts, scts, SCT_SOURCE_X509V3_EXTENSION);
  
          SCT_LIST_free(scts);
      }
  
      return scts_extracted;
  }
  
  /*
   * Attempts to find all received SCTs by checking TLS extensions, the OCSP
   * response (if it exists) and X509v3 extensions in the certificate.
   * Returns NULL if an error occurs.
   */
  const STACK_OF(SCT) *SSL_get0_peer_scts(SSL *s)
  {
      if (!s->scts_parsed) {
          if (ct_extract_tls_extension_scts(s) < 0 ||
              ct_extract_ocsp_response_scts(s) < 0 ||
              ct_extract_x509v3_extension_scts(s) < 0)
              goto err;
  
          s->scts_parsed = 1;
      }
      return s->scts;
  err:
      return NULL;
  }
  
  static int ct_permissive(const CT_POLICY_EVAL_CTX *ctx,
                           const STACK_OF(SCT) *scts, void *unused_arg)
  {
      return 1;
  }
  
  static int ct_strict(const CT_POLICY_EVAL_CTX *ctx,
                       const STACK_OF(SCT) *scts, void *unused_arg)
  {
      int count = scts != NULL ? sk_SCT_num(scts) : 0;
      int i;
  
      for (i = 0; i < count; ++i) {
          SCT *sct = sk_SCT_value(scts, i);
          int status = SCT_get_validation_status(sct);
  
          if (status == SCT_VALIDATION_STATUS_VALID)
              return 1;
      }
      SSLerr(SSL_F_CT_STRICT, SSL_R_NO_VALID_SCTS);
      return 0;
  }
  
  int SSL_set_ct_validation_callback(SSL *s, ssl_ct_validation_cb callback,
                                     void *arg)
  {
      /*
       * Since code exists that uses the custom extension handler for CT, look
       * for this and throw an error if they have already registered to use CT.
       */
      if (callback != NULL && SSL_CTX_has_client_custom_ext(s->ctx,
              TLSEXT_TYPE_signed_certificate_timestamp)) {
          SSLerr(SSL_F_SSL_SET_CT_VALIDATION_CALLBACK,
                 SSL_R_CUSTOM_EXT_HANDLER_ALREADY_INSTALLED);
          return 0;
      }
  
      if (callback != NULL) {
          /* If we are validating CT, then we MUST accept SCTs served via OCSP */
          if (!SSL_set_tlsext_status_type(s, TLSEXT_STATUSTYPE_ocsp))
              return 0;
      }
  
      s->ct_validation_callback = callback;
      s->ct_validation_callback_arg = arg;
  
      return 1;
  }
  
  int SSL_CTX_set_ct_validation_callback(SSL_CTX *ctx,
                                         ssl_ct_validation_cb callback,
                                         void *arg)
  {
      /*
       * Since code exists that uses the custom extension handler for CT, look for
       * this and throw an error if they have already registered to use CT.
       */
      if (callback != NULL && SSL_CTX_has_client_custom_ext(ctx,
              TLSEXT_TYPE_signed_certificate_timestamp)) {
          SSLerr(SSL_F_SSL_CTX_SET_CT_VALIDATION_CALLBACK,
                 SSL_R_CUSTOM_EXT_HANDLER_ALREADY_INSTALLED);
          return 0;
      }
  
      ctx->ct_validation_callback = callback;
      ctx->ct_validation_callback_arg = arg;
      return 1;
  }
  
  int SSL_ct_is_enabled(const SSL *s)
  {
      return s->ct_validation_callback != NULL;
  }
  
  int SSL_CTX_ct_is_enabled(const SSL_CTX *ctx)
  {
      return ctx->ct_validation_callback != NULL;
  }
  
  int ssl_validate_ct(SSL *s)
  {
      int ret = 0;
      X509 *cert = s->session != NULL ? s->session->peer : NULL;
      X509 *issuer;
      SSL_DANE *dane = &s->dane;
      CT_POLICY_EVAL_CTX *ctx = NULL;
      const STACK_OF(SCT) *scts;
  
      /*
       * If no callback is set, the peer is anonymous, or its chain is invalid,
       * skip SCT validation - just return success.  Applications that continue
       * handshakes without certificates, with unverified chains, or pinned leaf
       * certificates are outside the scope of the WebPKI and CT.
       *
       * The above exclusions notwithstanding the vast majority of peers will
       * have rather ordinary certificate chains validated by typical
       * applications that perform certificate verification and therefore will
       * process SCTs when enabled.
       */
      if (s->ct_validation_callback == NULL || cert == NULL ||
          s->verify_result != X509_V_OK ||
          s->verified_chain == NULL ||
          sk_X509_num(s->verified_chain) <= 1)
          return 1;
  
      /*
       * CT not applicable for chains validated via DANE-TA(2) or DANE-EE(3)
       * trust-anchors.  See https://tools.ietf.org/html/rfc7671#section-4.2
       */
      if (DANETLS_ENABLED(dane) && dane->mtlsa != NULL) {
          switch (dane->mtlsa->usage) {
          case DANETLS_USAGE_DANE_TA:
          case DANETLS_USAGE_DANE_EE:
              return 1;
          }
      }
  
      ctx = CT_POLICY_EVAL_CTX_new();
      if (ctx == NULL) {
          SSLerr(SSL_F_SSL_VALIDATE_CT, ERR_R_MALLOC_FAILURE);
          goto end;
      }
  
      issuer = sk_X509_value(s->verified_chain, 1);
      CT_POLICY_EVAL_CTX_set0_cert(ctx, cert);
      CT_POLICY_EVAL_CTX_set0_issuer(ctx, issuer);
      CT_POLICY_EVAL_CTX_set0_log_store(ctx, s->ctx->ctlog_store);
  
      scts = SSL_get0_peer_scts(s);
  
      /*
       * This function returns success (> 0) only when all the SCTs are valid, 0
       * when some are invalid, and < 0 on various internal errors (out of
       * memory, etc.).  Having some, or even all, invalid SCTs is not sufficient
       * reason to abort the handshake, that decision is up to the callback.
       * Therefore, we error out only in the unexpected case that the return
       * value is negative.
       *
       * XXX: One might well argue that the return value of this function is an
       * unforunate design choice.  Its job is only to determine the validation
       * status of each of the provided SCTs.  So long as it correctly separates
       * the wheat from the chaff it should return success.  Failure in this case
       * ought to correspond to an inability to carry out its duties.
       */
      if (SCT_LIST_validate(scts, ctx) < 0) {
          SSLerr(SSL_F_SSL_VALIDATE_CT, SSL_R_SCT_VERIFICATION_FAILED);
          goto end;
      }
  
      ret = s->ct_validation_callback(ctx, scts, s->ct_validation_callback_arg);
      if (ret < 0)
          ret = 0; /* This function returns 0 on failure */
  
  end:
      CT_POLICY_EVAL_CTX_free(ctx);
      /*
       * With SSL_VERIFY_NONE the session may be cached and re-used despite a
       * failure return code here.  Also the application may wish the complete
       * the handshake, and then disconnect cleanly at a higher layer, after
       * checking the verification status of the completed connection.
       *
       * We therefore force a certificate verification failure which will be
       * visible via SSL_get_verify_result() and cached as part of any resumed
       * session.
       *
       * Note: the permissive callback is for information gathering only, always
       * returns success, and does not affect verification status.  Only the
       * strict callback or a custom application-specified callback can trigger
       * connection failure or record a verification error.
       */
      if (ret <= 0)
          s->verify_result = X509_V_ERR_NO_VALID_SCTS;
      return ret;
  }
  
  int SSL_CTX_enable_ct(SSL_CTX *ctx, int validation_mode)
  {
      switch (validation_mode) {
      default:
          SSLerr(SSL_F_SSL_CTX_ENABLE_CT, SSL_R_INVALID_CT_VALIDATION_TYPE);
          return 0;
      case SSL_CT_VALIDATION_PERMISSIVE:
          return SSL_CTX_set_ct_validation_callback(ctx, ct_permissive, NULL);
      case SSL_CT_VALIDATION_STRICT:
          return SSL_CTX_set_ct_validation_callback(ctx, ct_strict, NULL);
      }
  }
  
  int SSL_enable_ct(SSL *s, int validation_mode)
  {
      switch (validation_mode) {
      default:
          SSLerr(SSL_F_SSL_ENABLE_CT, SSL_R_INVALID_CT_VALIDATION_TYPE);
          return 0;
      case SSL_CT_VALIDATION_PERMISSIVE:
          return SSL_set_ct_validation_callback(s, ct_permissive, NULL);
      case SSL_CT_VALIDATION_STRICT:
          return SSL_set_ct_validation_callback(s, ct_strict, NULL);
      }
  }
  
  int SSL_CTX_set_default_ctlog_list_file(SSL_CTX *ctx)
  {
      return CTLOG_STORE_load_default_file(ctx->ctlog_store);
  }
  
  int SSL_CTX_set_ctlog_list_file(SSL_CTX *ctx, const char *path)
  {
      return CTLOG_STORE_load_file(ctx->ctlog_store, path);
  }
  
  void SSL_CTX_set0_ctlog_store(SSL_CTX *ctx, CTLOG_STORE *logs)
  {
      CTLOG_STORE_free(ctx->ctlog_store);
      ctx->ctlog_store = logs;
  }
  
  const CTLOG_STORE *SSL_CTX_get0_ctlog_store(const SSL_CTX *ctx)
  {
      return ctx->ctlog_store;
  }
  
  #endif
  