/src/libressl/ssl/ssl_ciph.c

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/* $OpenBSD: ssl_ciph.c,v 1.129 2022/06/29 20:06:55 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * 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 <stdio.h>

#include <openssl/objects.h>
#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

#include "ssl_locl.h"

#define CIPHER_ADD  1
#define CIPHER_KILL 2
#define CIPHER_DEL  3
#define CIPHER_ORD  4
#define CIPHER_SPECIAL  5

typedef struct cipher_order_st {
  const SSL_CIPHER *cipher;
  int active;
  int dead;
  struct cipher_order_st *next, *prev;
} CIPHER_ORDER;

static const SSL_CIPHER cipher_aliases[] = {

  /* "ALL" doesn't include eNULL (must be specifically enabled) */
  {
    .name = SSL_TXT_ALL,
    .algorithm_enc = ~SSL_eNULL,
  },

  /* "COMPLEMENTOFALL" */
  {
    .name = SSL_TXT_CMPALL,
    .algorithm_enc = SSL_eNULL,
  },

  /*
   * "COMPLEMENTOFDEFAULT"
   * (does *not* include ciphersuites not found in ALL!)
   */
  {
    .name = SSL_TXT_CMPDEF,
    .algorithm_mkey = SSL_kDHE|SSL_kECDHE,
    .algorithm_auth = SSL_aNULL,
    .algorithm_enc = ~SSL_eNULL,
  },

  /*
   * key exchange aliases
   * (some of those using only a single bit here combine multiple key
   * exchange algs according to the RFCs, e.g. kEDH combines DHE_DSS
   * and DHE_RSA)
   */
  {
    .name = SSL_TXT_kRSA,
    .algorithm_mkey = SSL_kRSA,
  },
  {
    .name = SSL_TXT_kEDH,
    .algorithm_mkey = SSL_kDHE,
  },
  {
    .name = SSL_TXT_DH,
    .algorithm_mkey = SSL_kDHE,
  },
  {
    .name = SSL_TXT_kEECDH,
    .algorithm_mkey = SSL_kECDHE,
  },
  {
    .name = SSL_TXT_ECDH,
    .algorithm_mkey = SSL_kECDHE,
  },
  {
    .name = SSL_TXT_kGOST,
    .algorithm_mkey = SSL_kGOST,
  },

  /* server authentication aliases */
  {
    .name = SSL_TXT_aRSA,
    .algorithm_auth = SSL_aRSA,
  },
  {
    .name = SSL_TXT_aDSS,
    .algorithm_auth = SSL_aDSS,
  },
  {
    .name = SSL_TXT_DSS,
    .algorithm_auth = SSL_aDSS,
  },
  {
    .name = SSL_TXT_aNULL,
    .algorithm_auth = SSL_aNULL,
  },
  {
    .name = SSL_TXT_aECDSA,
    .algorithm_auth = SSL_aECDSA,
  },
  {
    .name = SSL_TXT_ECDSA,
    .algorithm_auth = SSL_aECDSA,
  },
  {
    .name = SSL_TXT_aGOST01,
    .algorithm_auth = SSL_aGOST01,
  },
  {
    .name = SSL_TXT_aGOST,
    .algorithm_auth = SSL_aGOST01,
  },

  /* aliases combining key exchange and server authentication */
  {
    .name = SSL_TXT_DHE,
    .algorithm_mkey = SSL_kDHE,
    .algorithm_auth = ~SSL_aNULL,
  },
  {
    .name = SSL_TXT_EDH,
    .algorithm_mkey = SSL_kDHE,
    .algorithm_auth = ~SSL_aNULL,
  },
  {
    .name = SSL_TXT_ECDHE,
    .algorithm_mkey = SSL_kECDHE,
    .algorithm_auth = ~SSL_aNULL,
  },
  {
    .name = SSL_TXT_EECDH,
    .algorithm_mkey = SSL_kECDHE,
    .algorithm_auth = ~SSL_aNULL,
  },
  {
    .name = SSL_TXT_NULL,
    .algorithm_enc = SSL_eNULL,
  },
  {
    .name = SSL_TXT_RSA,
    .algorithm_mkey = SSL_kRSA,
    .algorithm_auth = SSL_aRSA,
  },
  {
    .name = SSL_TXT_ADH,
    .algorithm_mkey = SSL_kDHE,
    .algorithm_auth = SSL_aNULL,
  },
  {
    .name = SSL_TXT_AECDH,
    .algorithm_mkey = SSL_kECDHE,
    .algorithm_auth = SSL_aNULL,
  },

  /* symmetric encryption aliases */
  {
    .name = SSL_TXT_3DES,
    .algorithm_enc = SSL_3DES,
  },
  {
    .name = SSL_TXT_RC4,
    .algorithm_enc = SSL_RC4,
  },
  {
    .name = SSL_TXT_eNULL,
    .algorithm_enc = SSL_eNULL,
  },
  {
    .name = SSL_TXT_AES128,
    .algorithm_enc = SSL_AES128|SSL_AES128GCM,
  },
  {
    .name = SSL_TXT_AES256,
    .algorithm_enc = SSL_AES256|SSL_AES256GCM,
  },
  {
    .name = SSL_TXT_AES,
    .algorithm_enc = SSL_AES,
  },
  {
    .name = SSL_TXT_AES_GCM,
    .algorithm_enc = SSL_AES128GCM|SSL_AES256GCM,
  },
  {
    .name = SSL_TXT_CAMELLIA128,
    .algorithm_enc = SSL_CAMELLIA128,
  },
  {
    .name = SSL_TXT_CAMELLIA256,
    .algorithm_enc = SSL_CAMELLIA256,
  },
  {
    .name = SSL_TXT_CAMELLIA,
    .algorithm_enc = SSL_CAMELLIA128|SSL_CAMELLIA256,
  },
  {
    .name = SSL_TXT_CHACHA20,
    .algorithm_enc = SSL_CHACHA20POLY1305,
  },

  /* MAC aliases */
  {
    .name = SSL_TXT_AEAD,
    .algorithm_mac = SSL_AEAD,
  },
  {
    .name = SSL_TXT_MD5,
    .algorithm_mac = SSL_MD5,
  },
  {
    .name = SSL_TXT_SHA1,
    .algorithm_mac = SSL_SHA1,
  },
  {
    .name = SSL_TXT_SHA,
    .algorithm_mac = SSL_SHA1,
  },
  {
    .name = SSL_TXT_GOST94,
    .algorithm_mac = SSL_GOST94,
  },
  {
    .name = SSL_TXT_GOST89MAC,
    .algorithm_mac = SSL_GOST89MAC,
  },
  {
    .name = SSL_TXT_SHA256,
    .algorithm_mac = SSL_SHA256,
  },
  {
    .name = SSL_TXT_SHA384,
    .algorithm_mac = SSL_SHA384,
  },
  {
    .name = SSL_TXT_STREEBOG256,
    .algorithm_mac = SSL_STREEBOG256,
  },

  /* protocol version aliases */
  {
    .name = SSL_TXT_SSLV3,
    .algorithm_ssl = SSL_SSLV3,
  },
  {
    .name = SSL_TXT_TLSV1,
    .algorithm_ssl = SSL_TLSV1,
  },
  {
    .name = SSL_TXT_TLSV1_2,
    .algorithm_ssl = SSL_TLSV1_2,
  },
  {
    .name = SSL_TXT_TLSV1_3,
    .algorithm_ssl = SSL_TLSV1_3,
  },

  /* cipher suite aliases */
#ifdef LIBRESSL_HAS_TLS1_3
  {
    .valid = 1,
    .name = "TLS_AES_128_GCM_SHA256",
    .id = TLS1_3_CK_AES_128_GCM_SHA256,
    .algorithm_ssl = SSL_TLSV1_3,
  },
  {
    .valid = 1,
    .name = "TLS_AES_256_GCM_SHA384",
    .id = TLS1_3_CK_AES_256_GCM_SHA384,
    .algorithm_ssl = SSL_TLSV1_3,
  },
  {
    .valid = 1,
    .name = "TLS_CHACHA20_POLY1305_SHA256",
    .id = TLS1_3_CK_CHACHA20_POLY1305_SHA256,
    .algorithm_ssl = SSL_TLSV1_3,
  },
#endif

  /* strength classes */
  {
    .name = SSL_TXT_LOW,
    .algo_strength = SSL_LOW,
  },
  {
    .name = SSL_TXT_MEDIUM,
    .algo_strength = SSL_MEDIUM,
  },
  {
    .name = SSL_TXT_HIGH,
    .algo_strength = SSL_HIGH,
  },
};

int
ssl_cipher_get_evp(const SSL_SESSION *ss, const EVP_CIPHER **enc,
    const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size)
{
  *enc = NULL;
  *md = NULL;
  *mac_pkey_type = NID_undef;
  *mac_secret_size = 0;

  if (ss->cipher == NULL)
    return 0;

  /*
   * This function does not handle EVP_AEAD.
   * See ssl_cipher_get_evp_aead instead.
   */
  if (ss->cipher->algorithm_mac & SSL_AEAD)
    return 0;

  switch (ss->cipher->algorithm_enc) {
  case SSL_3DES:
    *enc = EVP_des_ede3_cbc();
    break;
  case SSL_RC4:
    *enc = EVP_rc4();
    break;
  case SSL_eNULL:
    *enc = EVP_enc_null();
    break;
  case SSL_AES128:
    *enc = EVP_aes_128_cbc();
    break;
  case SSL_AES256:
    *enc = EVP_aes_256_cbc();
    break;
  case SSL_CAMELLIA128:
    *enc = EVP_camellia_128_cbc();
    break;
  case SSL_CAMELLIA256:
    *enc = EVP_camellia_256_cbc();
    break;
  case SSL_eGOST2814789CNT:
    *enc = EVP_gost2814789_cnt();
    break;
  }

  switch (ss->cipher->algorithm_mac) {
  case SSL_MD5:
    *md = EVP_md5();
    break;
  case SSL_SHA1:
    *md = EVP_sha1();
    break;
  case SSL_SHA256:
    *md = EVP_sha256();
    break;
  case SSL_SHA384:
    *md = EVP_sha384();
    break;
  case SSL_GOST89MAC:
    *md = EVP_gost2814789imit();
    break;
  case SSL_GOST94:
    *md = EVP_gostr341194();
    break;
  case SSL_STREEBOG256:
    *md = EVP_streebog256();
    break;
  }

  if (*enc == NULL || *md == NULL)
    return 0;

  /*
   * EVP_CIPH_FLAG_AEAD_CIPHER and EVP_CIPH_GCM_MODE ciphers are not
   * supported via EVP_CIPHER (they should be using EVP_AEAD instead).
   */
  if (EVP_CIPHER_flags(*enc) & EVP_CIPH_FLAG_AEAD_CIPHER)
    return 0;
  if (EVP_CIPHER_mode(*enc) == EVP_CIPH_GCM_MODE)
    return 0;

  if (ss->cipher->algorithm_mac == SSL_GOST89MAC) {
    *mac_pkey_type = EVP_PKEY_GOSTIMIT;
    *mac_secret_size = 32; /* XXX */
  } else {
    *mac_pkey_type = EVP_PKEY_HMAC;
    *mac_secret_size = EVP_MD_size(*md);
  }

  return 1;
}

/*
 * ssl_cipher_get_evp_aead sets aead to point to the correct EVP_AEAD object
 * for s->cipher. It returns 1 on success and 0 on error.
 */
int
ssl_cipher_get_evp_aead(const SSL_SESSION *ss, const EVP_AEAD **aead)
{
  *aead = NULL;

  if (ss->cipher == NULL)
    return 0;
  if ((ss->cipher->algorithm_mac & SSL_AEAD) == 0)
    return 0;

  switch (ss->cipher->algorithm_enc) {
  case SSL_AES128GCM:
    *aead = EVP_aead_aes_128_gcm();
    return 1;
  case SSL_AES256GCM:
    *aead = EVP_aead_aes_256_gcm();
    return 1;
  case SSL_CHACHA20POLY1305:
    *aead = EVP_aead_chacha20_poly1305();
    return 1;
  default:
    break;
  }
  return 0;
}

int
ssl_get_handshake_evp_md(SSL *s, const EVP_MD **md)
{
  unsigned long handshake_mac;

  *md = NULL;

  if (s->s3->hs.cipher == NULL)
    return 0;

  handshake_mac = s->s3->hs.cipher->algorithm2 &
      SSL_HANDSHAKE_MAC_MASK;

  /* For TLSv1.2 we upgrade the default MD5+SHA1 MAC to SHA256. */
  if (SSL_USE_SHA256_PRF(s) && handshake_mac == SSL_HANDSHAKE_MAC_DEFAULT)
    handshake_mac = SSL_HANDSHAKE_MAC_SHA256;

  switch (handshake_mac) {
  case SSL_HANDSHAKE_MAC_DEFAULT:
    *md = EVP_md5_sha1();
    return 1;
  case SSL_HANDSHAKE_MAC_GOST94:
    *md = EVP_gostr341194();
    return 1;
  case SSL_HANDSHAKE_MAC_SHA256:
    *md = EVP_sha256();
    return 1;
  case SSL_HANDSHAKE_MAC_SHA384:
    *md = EVP_sha384();
    return 1;
  case SSL_HANDSHAKE_MAC_STREEBOG256:
    *md = EVP_streebog256();
    return 1;
  default:
    break;
  }

  return 0;
}

#define ITEM_SEP(a) \
  (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))

static void
ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
    CIPHER_ORDER **tail)
{
  if (curr == *tail)
    return;
  if (curr == *head)
    *head = curr->next;
  if (curr->prev != NULL)
    curr->prev->next = curr->next;
  if (curr->next != NULL)
    curr->next->prev = curr->prev;
  (*tail)->next = curr;
  curr->prev= *tail;
  curr->next = NULL;
  *tail = curr;
}

static void
ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
    CIPHER_ORDER **tail)
{
  if (curr == *head)
    return;
  if (curr == *tail)
    *tail = curr->prev;
  if (curr->next != NULL)
    curr->next->prev = curr->prev;
  if (curr->prev != NULL)
    curr->prev->next = curr->next;
  (*head)->prev = curr;
  curr->next= *head;
  curr->prev = NULL;
  *head = curr;
}

static void
ssl_cipher_get_disabled(unsigned long *mkey, unsigned long *auth,
    unsigned long *enc, unsigned long *mac, unsigned long *ssl)
{
  *mkey = 0;
  *auth = 0;
  *enc = 0;
  *mac = 0;
  *ssl = 0;

  /*
   * Check for the availability of GOST 34.10 public/private key
   * algorithms. If they are not available disable the associated
   * authentication and key exchange algorithms.
   */
  if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL) {
    *auth |= SSL_aGOST01;
    *mkey |= SSL_kGOST;
  }

#ifdef SSL_FORBID_ENULL
  *enc |= SSL_eNULL;
#endif
}

static void
ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method, int num_of_ciphers,
    unsigned long disabled_mkey, unsigned long disabled_auth,
    unsigned long disabled_enc, unsigned long disabled_mac,
    unsigned long disabled_ssl, CIPHER_ORDER *co_list,
    CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
  int i, co_list_num;
  const SSL_CIPHER *c;

  /*
   * We have num_of_ciphers descriptions compiled in, depending on the
   * method selected (SSLv3, TLSv1, etc). These will later be sorted in
   * a linked list with at most num entries.
   */

  /* Get the initial list of ciphers */
  co_list_num = 0;  /* actual count of ciphers */
  for (i = 0; i < num_of_ciphers; i++) {
    c = ssl_method->get_cipher(i);
    /*
     * Drop any invalid ciphers and any which use unavailable
     * algorithms.
     */
    if ((c != NULL) && c->valid &&
        !(c->algorithm_mkey & disabled_mkey) &&
        !(c->algorithm_auth & disabled_auth) &&
        !(c->algorithm_enc & disabled_enc) &&
        !(c->algorithm_mac & disabled_mac) &&
        !(c->algorithm_ssl & disabled_ssl)) {
      co_list[co_list_num].cipher = c;
      co_list[co_list_num].next = NULL;
      co_list[co_list_num].prev = NULL;
      co_list[co_list_num].active = 0;
      co_list_num++;
      /*
      if (!sk_push(ca_list,(char *)c)) goto err;
      */
    }
  }

  /*
   * Prepare linked list from list entries
   */
  if (co_list_num > 0) {
    co_list[0].prev = NULL;

    if (co_list_num > 1) {
      co_list[0].next = &co_list[1];

      for (i = 1; i < co_list_num - 1; i++) {
        co_list[i].prev = &co_list[i - 1];
        co_list[i].next = &co_list[i + 1];
      }

      co_list[co_list_num - 1].prev =
          &co_list[co_list_num - 2];
    }

    co_list[co_list_num - 1].next = NULL;

    *head_p = &co_list[0];
    *tail_p = &co_list[co_list_num - 1];
  }
}

static void
ssl_cipher_collect_aliases(const SSL_CIPHER **ca_list, int num_of_group_aliases,
    unsigned long disabled_mkey, unsigned long disabled_auth,
    unsigned long disabled_enc, unsigned long disabled_mac,
    unsigned long disabled_ssl, CIPHER_ORDER *head)
{
  CIPHER_ORDER *ciph_curr;
  const SSL_CIPHER **ca_curr;
  int i;
  unsigned long mask_mkey = ~disabled_mkey;
  unsigned long mask_auth = ~disabled_auth;
  unsigned long mask_enc = ~disabled_enc;
  unsigned long mask_mac = ~disabled_mac;
  unsigned long mask_ssl = ~disabled_ssl;

  /*
   * First, add the real ciphers as already collected
   */
  ciph_curr = head;
  ca_curr = ca_list;
  while (ciph_curr != NULL) {
    *ca_curr = ciph_curr->cipher;
    ca_curr++;
    ciph_curr = ciph_curr->next;
  }

  /*
   * Now we add the available ones from the cipher_aliases[] table.
   * They represent either one or more algorithms, some of which
   * in any affected category must be supported (set in enabled_mask),
   * or represent a cipher strength value (will be added in any case because algorithms=0).
   */
  for (i = 0; i < num_of_group_aliases; i++) {
    unsigned long algorithm_mkey = cipher_aliases[i].algorithm_mkey;
    unsigned long algorithm_auth = cipher_aliases[i].algorithm_auth;
    unsigned long algorithm_enc = cipher_aliases[i].algorithm_enc;
    unsigned long algorithm_mac = cipher_aliases[i].algorithm_mac;
    unsigned long algorithm_ssl = cipher_aliases[i].algorithm_ssl;

    if (algorithm_mkey)
      if ((algorithm_mkey & mask_mkey) == 0)
        continue;

    if (algorithm_auth)
      if ((algorithm_auth & mask_auth) == 0)
        continue;

    if (algorithm_enc)
      if ((algorithm_enc & mask_enc) == 0)
        continue;

    if (algorithm_mac)
      if ((algorithm_mac & mask_mac) == 0)
        continue;

    if (algorithm_ssl)
      if ((algorithm_ssl & mask_ssl) == 0)
        continue;

    *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
    ca_curr++;
  }

  *ca_curr = NULL;  /* end of list */
}

static void
ssl_cipher_apply_rule(unsigned long cipher_id, unsigned long alg_mkey,
    unsigned long alg_auth, unsigned long alg_enc, unsigned long alg_mac,
    unsigned long alg_ssl, unsigned long algo_strength, int rule,
    int strength_bits, CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
  CIPHER_ORDER *head, *tail, *curr, *next, *last;
  const SSL_CIPHER *cp;
  int reverse = 0;

  if (rule == CIPHER_DEL)
    reverse = 1; /* needed to maintain sorting between currently deleted ciphers */

  head = *head_p;
  tail = *tail_p;

  if (reverse) {
    next = tail;
    last = head;
  } else {
    next = head;
    last = tail;
  }

  curr = NULL;
  for (;;) {
    if (curr == last)
      break;
    curr = next;
    next = reverse ? curr->prev : curr->next;

    cp = curr->cipher;

    if (cipher_id && cp->id != cipher_id)
      continue;

    /*
     * Selection criteria is either the value of strength_bits
     * or the algorithms used.
     */
    if (strength_bits >= 0) {
      if (strength_bits != cp->strength_bits)
        continue;
    } else {
      if (alg_mkey && !(alg_mkey & cp->algorithm_mkey))
        continue;
      if (alg_auth && !(alg_auth & cp->algorithm_auth))
        continue;
      if (alg_enc && !(alg_enc & cp->algorithm_enc))
        continue;
      if (alg_mac && !(alg_mac & cp->algorithm_mac))
        continue;
      if (alg_ssl && !(alg_ssl & cp->algorithm_ssl))
        continue;
      if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
        continue;
    }

    /* add the cipher if it has not been added yet. */
    if (rule == CIPHER_ADD) {
      /* reverse == 0 */
      if (!curr->active) {
        ll_append_tail(&head, curr, &tail);
        curr->active = 1;
      }
    }
    /* Move the added cipher to this location */
    else if (rule == CIPHER_ORD) {
      /* reverse == 0 */
      if (curr->active) {
        ll_append_tail(&head, curr, &tail);
      }
    } else if (rule == CIPHER_DEL) {
      /* reverse == 1 */
      if (curr->active) {
        /* most recently deleted ciphersuites get best positions
         * for any future CIPHER_ADD (note that the CIPHER_DEL loop
         * works in reverse to maintain the order) */
        ll_append_head(&head, curr, &tail);
        curr->active = 0;
      }
    } else if (rule == CIPHER_KILL) {
      /* reverse == 0 */
      if (head == curr)
        head = curr->next;
      else
        curr->prev->next = curr->next;
      if (tail == curr)
        tail = curr->prev;
      curr->active = 0;
      if (curr->next != NULL)
        curr->next->prev = curr->prev;
      if (curr->prev != NULL)
        curr->prev->next = curr->next;
      curr->next = NULL;
      curr->prev = NULL;
    }
  }

  *head_p = head;
  *tail_p = tail;
}

static int
ssl_cipher_strength_sort(CIPHER_ORDER **head_p, CIPHER_ORDER **tail_p)
{
  int max_strength_bits, i, *number_uses;
  CIPHER_ORDER *curr;

  /*
   * This routine sorts the ciphers with descending strength. The sorting
   * must keep the pre-sorted sequence, so we apply the normal sorting
   * routine as '+' movement to the end of the list.
   */
  max_strength_bits = 0;
  curr = *head_p;
  while (curr != NULL) {
    if (curr->active &&
        (curr->cipher->strength_bits > max_strength_bits))
      max_strength_bits = curr->cipher->strength_bits;
    curr = curr->next;
  }

  number_uses = calloc((max_strength_bits + 1), sizeof(int));
  if (!number_uses) {
    SSLerrorx(ERR_R_MALLOC_FAILURE);
    return (0);
  }

  /*
   * Now find the strength_bits values actually used
   */
  curr = *head_p;
  while (curr != NULL) {
    if (curr->active)
      number_uses[curr->cipher->strength_bits]++;
    curr = curr->next;
  }
  /*
   * Go through the list of used strength_bits values in descending
   * order.
   */
  for (i = max_strength_bits; i >= 0; i--)
    if (number_uses[i] > 0)
      ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ORD, i, head_p, tail_p);

  free(number_uses);
  return (1);
}

static int
ssl_cipher_process_rulestr(const char *rule_str, CIPHER_ORDER **head_p,
    CIPHER_ORDER **tail_p, const SSL_CIPHER **ca_list, SSL_CERT *cert,
    int *tls13_seen)
{
  unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl;
  unsigned long algo_strength;
  int j, multi, found, rule, retval, ok, buflen;
  unsigned long cipher_id = 0;
  const char *l, *buf;
  char ch;

  *tls13_seen = 0;

  retval = 1;
  l = rule_str;
  for (;;) {
    ch = *l;

    if (ch == '\0')
      break;

    if (ch == '-') {
      rule = CIPHER_DEL;
      l++;
    } else if (ch == '+') {
      rule = CIPHER_ORD;
      l++;
    } else if (ch == '!') {
      rule = CIPHER_KILL;
      l++;
    } else if (ch == '@') {
      rule = CIPHER_SPECIAL;
      l++;
    } else {
      rule = CIPHER_ADD;
    }

    if (ITEM_SEP(ch)) {
      l++;
      continue;
    }

    alg_mkey = 0;
    alg_auth = 0;
    alg_enc = 0;
    alg_mac = 0;
    alg_ssl = 0;
    algo_strength = 0;

    for (;;) {
      ch = *l;
      buf = l;
      buflen = 0;
      while (((ch >= 'A') && (ch <= 'Z')) ||
          ((ch >= '0') && (ch <= '9')) ||
          ((ch >= 'a') && (ch <= 'z')) ||
          (ch == '-') || (ch == '.') ||
          (ch == '_') || (ch == '=')) {
        ch = *(++l);
        buflen++;
      }

      if (buflen == 0) {
        /*
         * We hit something we cannot deal with,
         * it is no command or separator nor
         * alphanumeric, so we call this an error.
         */
        SSLerrorx(SSL_R_INVALID_COMMAND);
        retval = found = 0;
        l++;
        break;
      }

      if (rule == CIPHER_SPECIAL) {
         /* unused -- avoid compiler warning */
        found = 0;
        /* special treatment */
        break;
      }

      /* check for multi-part specification */
      if (ch == '+') {
        multi = 1;
        l++;
      } else
        multi = 0;

      /*
       * Now search for the cipher alias in the ca_list.
       * Be careful with the strncmp, because the "buflen"
       * limitation will make the rule "ADH:SOME" and the
       * cipher "ADH-MY-CIPHER" look like a match for
       * buflen=3. So additionally check whether the cipher
       * name found has the correct length. We can save a
       * strlen() call: just checking for the '\0' at the
       * right place is sufficient, we have to strncmp()
       * anyway (we cannot use strcmp(), because buf is not
       * '\0' terminated.)
       */
      j = found = 0;
      cipher_id = 0;
      while (ca_list[j]) {
        if (!strncmp(buf, ca_list[j]->name, buflen) &&
            (ca_list[j]->name[buflen] == '\0')) {
          found = 1;
          break;
        } else
          j++;
      }

      if (!found)
        break;  /* ignore this entry */

      if (ca_list[j]->algorithm_mkey) {
        if (alg_mkey) {
          alg_mkey &= ca_list[j]->algorithm_mkey;
          if (!alg_mkey) {
            found = 0;
            break;
          }
        } else
          alg_mkey = ca_list[j]->algorithm_mkey;
      }

      if (ca_list[j]->algorithm_auth) {
        if (alg_auth) {
          alg_auth &= ca_list[j]->algorithm_auth;
          if (!alg_auth) {
            found = 0;
            break;
          }
        } else
          alg_auth = ca_list[j]->algorithm_auth;
      }

      if (ca_list[j]->algorithm_enc) {
        if (alg_enc) {
          alg_enc &= ca_list[j]->algorithm_enc;
          if (!alg_enc) {
            found = 0;
            break;
          }
        } else
          alg_enc = ca_list[j]->algorithm_enc;
      }

      if (ca_list[j]->algorithm_mac) {
        if (alg_mac) {
          alg_mac &= ca_list[j]->algorithm_mac;
          if (!alg_mac) {
            found = 0;
            break;
          }
        } else
          alg_mac = ca_list[j]->algorithm_mac;
      }

      if (ca_list[j]->algo_strength & SSL_STRONG_MASK) {
        if (algo_strength & SSL_STRONG_MASK) {
          algo_strength &=
              (ca_list[j]->algo_strength &
              SSL_STRONG_MASK) | ~SSL_STRONG_MASK;
          if (!(algo_strength &
              SSL_STRONG_MASK)) {
            found = 0;
            break;
          }
        } else
          algo_strength |=
              ca_list[j]->algo_strength &
              SSL_STRONG_MASK;
      }

      if (ca_list[j]->valid) {
        /*
         * explicit ciphersuite found; its protocol
         * version does not become part of the search
         * pattern!
         */
        cipher_id = ca_list[j]->id;
        if (ca_list[j]->algorithm_ssl == SSL_TLSV1_3)
          *tls13_seen = 1;
      } else {
        /*
         * not an explicit ciphersuite; only in this
         * case, the protocol version is considered
         * part of the search pattern
         */
        if (ca_list[j]->algorithm_ssl) {
          if (alg_ssl) {
            alg_ssl &=
                ca_list[j]->algorithm_ssl;
            if (!alg_ssl) {
              found = 0;
              break;
            }
          } else
            alg_ssl =
                ca_list[j]->algorithm_ssl;
        }
      }

      if (!multi)
        break;
    }

    /*
     * Ok, we have the rule, now apply it
     */
    if (rule == CIPHER_SPECIAL) {
      /* special command */
      ok = 0;
      if (buflen == 8 && strncmp(buf, "STRENGTH", 8) == 0) {
        ok = ssl_cipher_strength_sort(head_p, tail_p);
      } else if (buflen == 10 &&
          strncmp(buf, "SECLEVEL=", 9) == 0) {
        int level = buf[9] - '0';

        if (level >= 0 && level <= 5) {
          cert->security_level = level;
          ok = 1;
        } else {
          SSLerrorx(SSL_R_INVALID_COMMAND);
        }
      } else {
        SSLerrorx(SSL_R_INVALID_COMMAND);
      }
      if (ok == 0)
        retval = 0;

      while ((*l != '\0') && !ITEM_SEP(*l))
        l++;
    } else if (found) {
      if (alg_ssl == SSL_TLSV1_3)
        *tls13_seen = 1;
      ssl_cipher_apply_rule(cipher_id, alg_mkey, alg_auth,
          alg_enc, alg_mac, alg_ssl, algo_strength, rule,
          -1, head_p, tail_p);
    } else {
      while ((*l != '\0') && !ITEM_SEP(*l))
        l++;
    }
    if (*l == '\0')
      break; /* done */
  }

  return (retval);
}

static inline int
ssl_aes_is_accelerated(void)
{
#if defined(__i386__) || defined(__x86_64__)
  return ((OPENSSL_cpu_caps() & (1ULL << 57)) != 0);
#else
  return (0);
#endif
}

STACK_OF(SSL_CIPHER) *
ssl_create_cipher_list(const SSL_METHOD *ssl_method,
    STACK_OF(SSL_CIPHER) **cipher_list,
    STACK_OF(SSL_CIPHER) *cipher_list_tls13,
    const char *rule_str, SSL_CERT *cert)
{
  int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
  unsigned long disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl;
  STACK_OF(SSL_CIPHER) *cipherstack;
  const char *rule_p;
  CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
  const SSL_CIPHER **ca_list = NULL;
  const SSL_CIPHER *cipher;
  int tls13_seen = 0;
  int any_active;
  int i;

  /*
   * Return with error if nothing to do.
   */
  if (rule_str == NULL || cipher_list == NULL)
    return NULL;

  /*
   * To reduce the work to do we only want to process the compiled
   * in algorithms, so we first get the mask of disabled ciphers.
   */
  ssl_cipher_get_disabled(&disabled_mkey, &disabled_auth, &disabled_enc, &disabled_mac, &disabled_ssl);

  /*
   * Now we have to collect the available ciphers from the compiled
   * in ciphers. We cannot get more than the number compiled in, so
   * it is used for allocation.
   */
  num_of_ciphers = ssl3_num_ciphers();
  co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER));
  if (co_list == NULL) {
    SSLerrorx(ERR_R_MALLOC_FAILURE);
    return(NULL); /* Failure */
  }

  ssl_cipher_collect_ciphers(ssl_method, num_of_ciphers,
      disabled_mkey, disabled_auth, disabled_enc, disabled_mac, disabled_ssl,
      co_list, &head, &tail);


  /* Now arrange all ciphers by preference: */

  /* Everything else being equal, prefer ephemeral ECDH over other key exchange mechanisms */
  ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
  ssl_cipher_apply_rule(0, SSL_kECDHE, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);

  if (ssl_aes_is_accelerated()) {
    /*
     * We have hardware assisted AES - prefer AES as a symmetric
     * cipher, with CHACHA20 second.
     */
    ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0,
        CIPHER_ADD, -1, &head, &tail);
    ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305,
        0, 0, 0, CIPHER_ADD, -1, &head, &tail);
  } else {
    /*
     * CHACHA20 is fast and safe on all hardware and is thus our
     * preferred symmetric cipher, with AES second.
     */
    ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20POLY1305,
        0, 0, 0, CIPHER_ADD, -1, &head, &tail);
    ssl_cipher_apply_rule(0, 0, 0, SSL_AES, 0, 0, 0,
        CIPHER_ADD, -1, &head, &tail);
  }

  /* Temporarily enable everything else for sorting */
  ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);

  /* Low priority for MD5 */
  ssl_cipher_apply_rule(0, 0, 0, 0, SSL_MD5, 0, 0, CIPHER_ORD, -1, &head, &tail);

  /* Move anonymous ciphers to the end.  Usually, these will remain disabled.
   * (For applications that allow them, they aren't too bad, but we prefer
   * authenticated ciphers.) */
  ssl_cipher_apply_rule(0, 0, SSL_aNULL, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);

  /* Move ciphers without forward secrecy to the end */
  ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);

  /* RC4 is sort of broken - move it to the end */
  ssl_cipher_apply_rule(0, 0, 0, SSL_RC4, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);

  /* Now sort by symmetric encryption strength.  The above ordering remains
   * in force within each class */
  if (!ssl_cipher_strength_sort(&head, &tail)) {
    free(co_list);
    return NULL;
  }

  /* Now disable everything (maintaining the ordering!) */
  ssl_cipher_apply_rule(0, 0, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);

  /* TLSv1.3 first. */
  ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_ADD, -1, &head, &tail);
  ssl_cipher_apply_rule(0, 0, 0, 0, 0, SSL_TLSV1_3, 0, CIPHER_DEL, -1, &head, &tail);

  /*
   * We also need cipher aliases for selecting based on the rule_str.
   * There might be two types of entries in the rule_str: 1) names
   * of ciphers themselves 2) aliases for groups of ciphers.
   * For 1) we need the available ciphers and for 2) the cipher
   * groups of cipher_aliases added together in one list (otherwise
   * we would be happy with just the cipher_aliases table).
   */
  num_of_group_aliases = sizeof(cipher_aliases) / sizeof(SSL_CIPHER);
  num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
  ca_list = reallocarray(NULL, num_of_alias_max, sizeof(SSL_CIPHER *));
  if (ca_list == NULL) {
    free(co_list);
    SSLerrorx(ERR_R_MALLOC_FAILURE);
    return(NULL); /* Failure */
  }
  ssl_cipher_collect_aliases(ca_list, num_of_group_aliases, disabled_mkey,
      disabled_auth, disabled_enc, disabled_mac, disabled_ssl, head);

  /*
   * If the rule_string begins with DEFAULT, apply the default rule
   * before using the (possibly available) additional rules.
   */
  ok = 1;
  rule_p = rule_str;
  if (strncmp(rule_str, "DEFAULT", 7) == 0) {
    ok = ssl_cipher_process_rulestr(SSL_DEFAULT_CIPHER_LIST,
        &head, &tail, ca_list, cert, &tls13_seen);
    rule_p += 7;
    if (*rule_p == ':')
      rule_p++;
  }

  if (ok && (strlen(rule_p) > 0))
    ok = ssl_cipher_process_rulestr(rule_p, &head, &tail, ca_list,
        cert, &tls13_seen);

  free((void *)ca_list);  /* Not needed anymore */

  if (!ok) {
    /* Rule processing failure */
    free(co_list);
    return (NULL);
  }

  /*
   * Allocate new "cipherstack" for the result, return with error
   * if we cannot get one.
   */
  if ((cipherstack = sk_SSL_CIPHER_new_null()) == NULL) {
    free(co_list);
    return (NULL);
  }

  /* Prefer TLSv1.3 cipher suites. */
  if (cipher_list_tls13 != NULL) {
    for (i = 0; i < sk_SSL_CIPHER_num(cipher_list_tls13); i++) {
      cipher = sk_SSL_CIPHER_value(cipher_list_tls13, i);
      sk_SSL_CIPHER_push(cipherstack, cipher);
    }
    tls13_seen = 1;
  }

  /*
   * The cipher selection for the list is done. The ciphers are added
   * to the resulting precedence to the STACK_OF(SSL_CIPHER).
   *
   * If the rule string did not contain any references to TLSv1.3 and
   * TLSv1.3 cipher suites have not been configured separately,
   * include inactive TLSv1.3 cipher suites. This avoids attempts to
   * use TLSv1.3 with an older rule string that does not include
   * TLSv1.3 cipher suites. If the rule string resulted in no active
   * cipher suites then we return an empty stack.
   */
  any_active = 0;
  for (curr = head; curr != NULL; curr = curr->next) {
    if (curr->active ||
        (!tls13_seen && curr->cipher->algorithm_ssl == SSL_TLSV1_3))
      sk_SSL_CIPHER_push(cipherstack, curr->cipher);
    any_active |= curr->active;
  }
  if (!any_active)
    sk_SSL_CIPHER_zero(cipherstack);

  free(co_list);  /* Not needed any longer */

  sk_SSL_CIPHER_free(*cipher_list);
  *cipher_list = cipherstack;

  return (cipherstack);
}

const SSL_CIPHER *
SSL_CIPHER_get_by_id(unsigned int id)
{
  return ssl3_get_cipher_by_id(id);
}

const SSL_CIPHER *
SSL_CIPHER_get_by_value(uint16_t value)
{
  return ssl3_get_cipher_by_value(value);
}

char *
SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
{
  unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, alg2;
  const char *ver, *kx, *au, *enc, *mac;
  char *ret;
  int l;

  alg_mkey = cipher->algorithm_mkey;
  alg_auth = cipher->algorithm_auth;
  alg_enc = cipher->algorithm_enc;
  alg_mac = cipher->algorithm_mac;
  alg_ssl = cipher->algorithm_ssl;

  alg2 = cipher->algorithm2;

  if (alg_ssl & SSL_SSLV3)
    ver = "SSLv3";
  else if (alg_ssl & SSL_TLSV1_2)
    ver = "TLSv1.2";
  else if (alg_ssl & SSL_TLSV1_3)
    ver = "TLSv1.3";
  else
    ver = "unknown";

  switch (alg_mkey) {
  case SSL_kRSA:
    kx = "RSA";
    break;
  case SSL_kDHE:
    kx = "DH";
    break;
  case SSL_kECDHE:
    kx = "ECDH";
    break;
  case SSL_kGOST:
    kx = "GOST";
    break;
  case SSL_kTLS1_3:
    kx = "TLSv1.3";
    break;
  default:
    kx = "unknown";
  }

  switch (alg_auth) {
  case SSL_aRSA:
    au = "RSA";
    break;
  case SSL_aDSS:
    au = "DSS";
    break;
  case SSL_aNULL:
    au = "None";
    break;
  case SSL_aECDSA:
    au = "ECDSA";
    break;
  case SSL_aGOST01:
    au = "GOST01";
    break;
  case SSL_aTLS1_3:
    au = "TLSv1.3";
    break;
  default:
    au = "unknown";
    break;
  }

  switch (alg_enc) {
  case SSL_3DES:
    enc = "3DES(168)";
    break;
  case SSL_RC4:
    enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)";
    break;
  case SSL_eNULL:
    enc = "None";
    break;
  case SSL_AES128:
    enc = "AES(128)";
    break;
  case SSL_AES256:
    enc = "AES(256)";
    break;
  case SSL_AES128GCM:
    enc = "AESGCM(128)";
    break;
  case SSL_AES256GCM:
    enc = "AESGCM(256)";
    break;
  case SSL_CAMELLIA128:
    enc = "Camellia(128)";
    break;
  case SSL_CAMELLIA256:
    enc = "Camellia(256)";
    break;
  case SSL_CHACHA20POLY1305:
    enc = "ChaCha20-Poly1305";
    break;
  case SSL_eGOST2814789CNT:
    enc = "GOST-28178-89-CNT";
    break;
  default:
    enc = "unknown";
    break;
  }

  switch (alg_mac) {
  case SSL_MD5:
    mac = "MD5";
    break;
  case SSL_SHA1:
    mac = "SHA1";
    break;
  case SSL_SHA256:
    mac = "SHA256";
    break;
  case SSL_SHA384:
    mac = "SHA384";
    break;
  case SSL_AEAD:
    mac = "AEAD";
    break;
  case SSL_GOST94:
    mac = "GOST94";
    break;
  case SSL_GOST89MAC:
    mac = "GOST89IMIT";
    break;
  case SSL_STREEBOG256:
    mac = "STREEBOG256";
    break;
  default:
    mac = "unknown";
    break;
  }

  if (asprintf(&ret, "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n",
      cipher->name, ver, kx, au, enc, mac) == -1)
    return "OPENSSL_malloc Error";

  if (buf != NULL) {
    l = strlcpy(buf, ret, len);
    free(ret);
    ret = buf;
    if (l >= len)
      ret = "Buffer too small";
  }

  return (ret);
}

const char *
SSL_CIPHER_get_version(const SSL_CIPHER *c)
{
  if (c == NULL)
    return("(NONE)");
  if ((c->id >> 24) == 3)
    return("TLSv1/SSLv3");
  else
    return("unknown");
}

/* return the actual cipher being used */
const char *
SSL_CIPHER_get_name(const SSL_CIPHER *c)
{
  if (c != NULL)
    return (c->name);
  return("(NONE)");
}

/* number of bits for symmetric cipher */
int
SSL_CIPHER_get_bits(const SSL_CIPHER *c, int *alg_bits)
{
  int ret = 0;

  if (c != NULL) {
    if (alg_bits != NULL)
      *alg_bits = c->alg_bits;
    ret = c->strength_bits;
  }
  return (ret);
}

unsigned long
SSL_CIPHER_get_id(const SSL_CIPHER *c)
{
  return c->id;
}

uint16_t
SSL_CIPHER_get_value(const SSL_CIPHER *c)
{
  return ssl3_cipher_get_value(c);
}

const SSL_CIPHER *
SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr)
{
  uint16_t cipher_value;
  CBS cbs;

  /* This API is documented with ptr being an array of length two. */
  CBS_init(&cbs, ptr, 2);
  if (!CBS_get_u16(&cbs, &cipher_value))
    return NULL;

  return ssl3_get_cipher_by_value(cipher_value);
}

int
SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c)
{
  switch (c->algorithm_enc) {
  case SSL_eNULL:
    return NID_undef;
  case SSL_3DES:
    return NID_des_ede3_cbc;
  case SSL_AES128:
    return NID_aes_128_cbc;
  case SSL_AES128GCM:
    return NID_aes_128_gcm;
  case SSL_AES256:
    return NID_aes_256_cbc;
  case SSL_AES256GCM:
    return NID_aes_256_gcm;
  case SSL_CAMELLIA128:
    return NID_camellia_128_cbc;
  case SSL_CAMELLIA256:
    return NID_camellia_256_cbc;
  case SSL_CHACHA20POLY1305:
    return NID_chacha20_poly1305;
  case SSL_DES:
    return NID_des_cbc;
  case SSL_RC4:
    return NID_rc4;
  case SSL_eGOST2814789CNT:
    return NID_gost89_cnt;
  default:
    return NID_undef;
  }
}

int
SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c)
{
  switch (c->algorithm_mac) {
  case SSL_AEAD:
    return NID_undef;
  case SSL_GOST89MAC:
    return NID_id_Gost28147_89_MAC;
  case SSL_GOST94:
    return NID_id_GostR3411_94;
  case SSL_MD5:
    return NID_md5;
  case SSL_SHA1:
    return NID_sha1;
  case SSL_SHA256:
    return NID_sha256;
  case SSL_SHA384:
    return NID_sha384;
  case SSL_STREEBOG256:
    return NID_id_tc26_gost3411_2012_256;
  default:
    return NID_undef;
  }
}

int
SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c)
{
  switch (c->algorithm_mkey) {
  case SSL_kDHE:
    return NID_kx_dhe;
  case SSL_kECDHE:
    return NID_kx_ecdhe;
  case SSL_kGOST:
    return NID_kx_gost;
  case SSL_kRSA:
    return NID_kx_rsa;
  default:
    return NID_undef;
  }
}

int
SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c)
{
  switch (c->algorithm_auth) {
  case SSL_aNULL:
    return NID_auth_null;
  case SSL_aECDSA:
    return NID_auth_ecdsa;
  case SSL_aGOST01:
    return NID_auth_gost01;
  case SSL_aRSA:
    return NID_auth_rsa;
  default:
    return NID_undef;
  }
}

int
SSL_CIPHER_is_aead(const SSL_CIPHER *c)
{
  return (c->algorithm_mac & SSL_AEAD) == SSL_AEAD;
}

void *
SSL_COMP_get_compression_methods(void)
{
  return NULL;
}

int
SSL_COMP_add_compression_method(int id, void *cm)
{
  return 1;
}

const char *
SSL_COMP_get_name(const void *comp)
{
  return NULL;
}

Coverage Report

Created: 2022-08-24 06:30