/* $OpenBSD: ssl_ciph.c,v 1.151 2025/01/18 12:20:37 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/evp.h>
#include <openssl/objects.h>
#include <openssl/opensslconf.h>

#include "ssl_local.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,
        },

        /* server authentication aliases */
        {
                .name = SSL_TXT_aRSA,
                .algorithm_auth = SSL_aRSA,
        },
        {
                .name = SSL_TXT_aNULL,
                .algorithm_auth = SSL_aNULL,
        },
        {
                .name = SSL_TXT_aECDSA,
                .algorithm_auth = SSL_aECDSA,
        },
        {
                .name = SSL_TXT_ECDSA,
                .algorithm_auth = SSL_aECDSA,
        },

        /* 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_SHA256,
                .algorithm_mac = SSL_SHA256,
        },
        {
                .name = SSL_TXT_SHA384,
                .algorithm_mac = SSL_SHA384,
        },

        /* 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
        {
                .value = 0x1301,
                .name = "TLS_AES_128_GCM_SHA256",
                .algorithm_ssl = SSL_TLSV1_3,
        },
        {
                .value = 0x1302,
                .name = "TLS_AES_256_GCM_SHA384",
                .algorithm_ssl = SSL_TLSV1_3,
        },
        {
                .value = 0x1303,
                .name = "TLS_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(SSL *s, const EVP_CIPHER **enc, const EVP_MD **md,
    int *mac_pkey_type, int *mac_secret_size)
{
        const SSL_CIPHER *cipher;

        *enc = NULL;
        *md = NULL;
        *mac_pkey_type = NID_undef;
        *mac_secret_size = 0;

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

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

        switch (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;
        }

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

        /* XXX remove these from ssl_cipher_get_evp? */
        /*
         * 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;

        *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(SSL *s, const EVP_AEAD **aead)
{
        const SSL_CIPHER *cipher;

        *aead = NULL;

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

        switch (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)
{
        const SSL_CIPHER *cipher;

        *md = NULL;

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

        switch (cipher->algorithm2 & SSL_HANDSHAKE_MAC_MASK) {
        case SSL_HANDSHAKE_MAC_SHA256:
                *md = EVP_sha256();
                return 1;
        case SSL_HANDSHAKE_MAC_SHA384:
                *md = EVP_sha384();
                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_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, iterating backwards over the
         * cipher list - the list is ordered by cipher value and we currently
         * hope that ciphers with higher cipher values are preferable...
         */
        co_list_num = 0;        /* actual count of ciphers */
        for (i = num_of_ciphers - 1; i >= 0; i--) {
                c = ssl3_get_cipher_by_index(i);

                /*
                 * Drop any invalid ciphers and any which use unavailable
                 * algorithms.
                 */
                if ((c != NULL) &&
                    !(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++;
                }
        }

        /*
         * 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(uint16_t cipher_value, 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_value != 0 && cp->value != cipher_value)
                        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;
        uint16_t cipher_value = 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);
                                return 0;
                        }

                        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_value = 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]->value != 0) {
                                /*
                                 * explicit ciphersuite found; its protocol
                                 * version does not become part of the search
                                 * pattern!
                                 */
                                cipher_value = ca_list[j]->value;
                                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_value, 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)
{
        return (OPENSSL_cpu_caps() & CRYPTO_CPU_CAPS_ACCELERATED_AES) != 0;
}

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 = NULL, *ret = NULL;
        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)
                goto err;

        disabled_mkey = 0;
        disabled_auth = 0;
        disabled_enc = 0;
        disabled_mac = 0;
        disabled_ssl = 0;

#ifdef SSL_FORBID_ENULL
        disabled_enc |= SSL_eNULL;
#endif

        /* DTLS cannot be used with stream ciphers. */
        if (ssl_method->dtls)
                disabled_enc |= SSL_RC4;

        /*
         * 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);
                goto err;
        }

        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))
                goto err;

        /* 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) {
                SSLerrorx(ERR_R_MALLOC_FAILURE);
                goto err;
        }
        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);

        if (!ok) {
                /* Rule processing failure */
                goto err;
        }

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

        /* 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);
                        if (!sk_SSL_CIPHER_push(cipherstack, cipher)) {
                                SSLerrorx(ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                }
                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)) {
                        if (!sk_SSL_CIPHER_push(cipherstack, curr->cipher)) {
                                SSLerrorx(ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                }
                any_active |= curr->active;
        }
        if (!any_active)
                sk_SSL_CIPHER_zero(cipherstack);

        sk_SSL_CIPHER_free(*cipher_list);
        *cipher_list = cipherstack;
        cipherstack = NULL;

        ret = *cipher_list;

 err:
        sk_SSL_CIPHER_free(cipherstack);
        free((void *)ca_list);
        free(co_list);

        return ret;
}

char *
SSL_CIPHER_description(const SSL_CIPHER *cipher, char *buf, int len)
{
        unsigned long alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl;
        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;

        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_kTLS1_3:
                kx = "TLSv1.3";
                break;
        default:
                kx = "unknown";
        }

        switch (alg_auth) {
        case SSL_aRSA:
                au = "RSA";
                break;
        case SSL_aNULL:
                au = "None";
                break;
        case SSL_aECDSA:
                au = "ECDSA";
                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 = "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;
        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;
        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);
}
LSSL_ALIAS(SSL_CIPHER_description);

const char *
SSL_CIPHER_get_version(const SSL_CIPHER *cipher)
{
        if (cipher == NULL)
                return "(NONE)";

        return "TLSv1/SSLv3";
}
LSSL_ALIAS(SSL_CIPHER_get_version);

/* return the actual cipher being used */
const char *
SSL_CIPHER_get_name(const SSL_CIPHER *cipher)
{
        if (cipher == NULL)
                return "(NONE)";

        return cipher->name;
}
LSSL_ALIAS(SSL_CIPHER_get_name);

/* 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);
}
LSSL_ALIAS(SSL_CIPHER_get_bits);

unsigned long
SSL_CIPHER_get_id(const SSL_CIPHER *cipher)
{
        return SSL3_CK_ID | cipher->value;
}
LSSL_ALIAS(SSL_CIPHER_get_id);

uint16_t
SSL_CIPHER_get_value(const SSL_CIPHER *cipher)
{
        return cipher->value;
}
LSSL_ALIAS(SSL_CIPHER_get_value);

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);
}
LSSL_ALIAS(SSL_CIPHER_find);

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_RC4:
                return NID_rc4;
        default:
                return NID_undef;
        }
}
LSSL_ALIAS(SSL_CIPHER_get_cipher_nid);

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

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_kRSA:
                return NID_kx_rsa;
        default:
                return NID_undef;
        }
}
LSSL_ALIAS(SSL_CIPHER_get_kx_nid);

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_aRSA:
                return NID_auth_rsa;
        default:
                return NID_undef;
        }
}
LSSL_ALIAS(SSL_CIPHER_get_auth_nid);

const EVP_MD *
SSL_CIPHER_get_handshake_digest(const SSL_CIPHER *c)
{
        switch (c->algorithm2 & SSL_HANDSHAKE_MAC_MASK) {
        case SSL_HANDSHAKE_MAC_SHA256:
                return EVP_sha256();
        case SSL_HANDSHAKE_MAC_SHA384:
                return EVP_sha384();
        default:
                return NULL;
        }
}
LSSL_ALIAS(SSL_CIPHER_get_handshake_digest);

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

void *
SSL_COMP_get_compression_methods(void)
{
        return NULL;
}
LSSL_ALIAS(SSL_COMP_get_compression_methods);

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