/* $OpenBSD: ssl_ciph.c,v 1.76 2014/12/06 15:27:45 jsing 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>

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

#include "ssl_locl.h"

#define SSL_ENC_DES_IDX		0
#define SSL_ENC_3DES_IDX	1
#define SSL_ENC_RC4_IDX		2
#define SSL_ENC_IDEA_IDX	3
#define SSL_ENC_NULL_IDX	4
#define SSL_ENC_AES128_IDX	5
#define SSL_ENC_AES256_IDX	6
#define SSL_ENC_CAMELLIA128_IDX	7
#define SSL_ENC_CAMELLIA256_IDX	8
#define SSL_ENC_GOST89_IDX	9
#define SSL_ENC_AES128GCM_IDX	10
#define SSL_ENC_AES256GCM_IDX	11
#define SSL_ENC_NUM_IDX		12


static const EVP_CIPHER *ssl_cipher_methods[SSL_ENC_NUM_IDX] = {
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};

#define SSL_MD_MD5_IDX	0
#define SSL_MD_SHA1_IDX	1
#define SSL_MD_GOST94_IDX 2
#define SSL_MD_GOST89MAC_IDX 3
#define SSL_MD_SHA256_IDX 4
#define SSL_MD_SHA384_IDX 5
#define SSL_MD_STREEBOG256_IDX 6
#define SSL_MD_STREEBOG512_IDX 7
/*Constant SSL_MAX_DIGEST equal to size of digests array should be 
 * defined in the
 * ssl_locl.h */
#define SSL_MD_NUM_IDX	SSL_MAX_DIGEST 
static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX] = {
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};

static int  ssl_mac_pkey_id[SSL_MD_NUM_IDX] = {
	EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_GOSTIMIT,
	EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC,
};

static int ssl_mac_secret_size[SSL_MD_NUM_IDX] = {
	0, 0, 0, 0, 0, 0, 0, 0
};

static int ssl_handshake_digest_flag[SSL_MD_NUM_IDX] = {
	SSL_HANDSHAKE_MAC_MD5, SSL_HANDSHAKE_MAC_SHA,
	SSL_HANDSHAKE_MAC_GOST94, 0, SSL_HANDSHAKE_MAC_SHA256,
	SSL_HANDSHAKE_MAC_SHA384, SSL_HANDSHAKE_MAC_STREEBOG256,
	SSL_HANDSHAKE_MAC_STREEBOG512
};

#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_kECDHr,
		.algorithm_mkey = SSL_kECDHr,
	},
	{
		.name = SSL_TXT_kECDHe,
		.algorithm_mkey = SSL_kECDHe,
	},
	{
		.name = SSL_TXT_kECDH,
		.algorithm_mkey = SSL_kECDHr|SSL_kECDHe,
	},
	{
		.name = SSL_TXT_kEECDH,
		.algorithm_mkey = SSL_kECDHE,
	},
	{
		.name = SSL_TXT_ECDH,
		.algorithm_mkey = SSL_kECDHr|SSL_kECDHe|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_aECDH,
		.algorithm_auth = SSL_aECDH,
	},
	{
		.name = SSL_TXT_aECDSA,
		.algorithm_auth = SSL_aECDSA,
	},
	{
		.name = SSL_TXT_ECDSA,
		.algorithm_auth = SSL_aECDSA,
	},
	{
		.name = SSL_TXT_aGOST94,
		.algorithm_auth = SSL_aGOST94,
	},
	{
		.name = SSL_TXT_aGOST01,
		.algorithm_auth = SSL_aGOST01,
	},
	{
		.name = SSL_TXT_aGOST,
		.algorithm_auth = SSL_aGOST94|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_DES,
		.algorithm_enc = SSL_DES,
	},
	{
		.name = SSL_TXT_3DES,
		.algorithm_enc = SSL_3DES,
	},
	{
		.name = SSL_TXT_RC4,
		.algorithm_enc = SSL_RC4,
	},
	{
		.name = SSL_TXT_IDEA,
		.algorithm_enc = SSL_IDEA,
	},
	{
		.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_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,
	},
	{
		.name = SSL_TXT_STREEBOG512,
		.algorithm_mac = SSL_STREEBOG512,
	},
	
	/* 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,
	},
	
	/* 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,
	},
};

void
ssl_load_ciphers(void)
{
	ssl_cipher_methods[SSL_ENC_DES_IDX] =
	    EVP_get_cipherbyname(SN_des_cbc);
	ssl_cipher_methods[SSL_ENC_3DES_IDX] =
	    EVP_get_cipherbyname(SN_des_ede3_cbc);
	ssl_cipher_methods[SSL_ENC_RC4_IDX] =
	    EVP_get_cipherbyname(SN_rc4);
#ifndef OPENSSL_NO_IDEA
	ssl_cipher_methods[SSL_ENC_IDEA_IDX] =
	    EVP_get_cipherbyname(SN_idea_cbc);
#else
	ssl_cipher_methods[SSL_ENC_IDEA_IDX] = NULL;
#endif
	ssl_cipher_methods[SSL_ENC_AES128_IDX] =
	    EVP_get_cipherbyname(SN_aes_128_cbc);
	ssl_cipher_methods[SSL_ENC_AES256_IDX] =
	    EVP_get_cipherbyname(SN_aes_256_cbc);
	ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] =
	    EVP_get_cipherbyname(SN_camellia_128_cbc);
	ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] =
	    EVP_get_cipherbyname(SN_camellia_256_cbc);
	ssl_cipher_methods[SSL_ENC_GOST89_IDX] =
	    EVP_get_cipherbyname(SN_gost89_cnt);

	ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] =
	    EVP_get_cipherbyname(SN_aes_128_gcm);
	ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] =
	    EVP_get_cipherbyname(SN_aes_256_gcm);

	ssl_digest_methods[SSL_MD_MD5_IDX] =
	    EVP_get_digestbyname(SN_md5);
	ssl_mac_secret_size[SSL_MD_MD5_IDX] =
	    EVP_MD_size(ssl_digest_methods[SSL_MD_MD5_IDX]);
	OPENSSL_assert(ssl_mac_secret_size[SSL_MD_MD5_IDX] >= 0);
	ssl_digest_methods[SSL_MD_SHA1_IDX] =
	    EVP_get_digestbyname(SN_sha1);
	ssl_mac_secret_size[SSL_MD_SHA1_IDX] =
	    EVP_MD_size(ssl_digest_methods[SSL_MD_SHA1_IDX]);
	OPENSSL_assert(ssl_mac_secret_size[SSL_MD_SHA1_IDX] >= 0);
	ssl_digest_methods[SSL_MD_GOST94_IDX] =
	    EVP_get_digestbyname(SN_id_GostR3411_94);
	if (ssl_digest_methods[SSL_MD_GOST94_IDX]) {
		ssl_mac_secret_size[SSL_MD_GOST94_IDX] =
		    EVP_MD_size(ssl_digest_methods[SSL_MD_GOST94_IDX]);
		OPENSSL_assert(ssl_mac_secret_size[SSL_MD_GOST94_IDX] >= 0);
	}
	ssl_digest_methods[SSL_MD_GOST89MAC_IDX] =
	    EVP_get_digestbyname(SN_id_Gost28147_89_MAC);
	if (ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX]) {
		ssl_mac_secret_size[SSL_MD_GOST89MAC_IDX] = 32;
	}

	ssl_digest_methods[SSL_MD_SHA256_IDX] =
	    EVP_get_digestbyname(SN_sha256);
	ssl_mac_secret_size[SSL_MD_SHA256_IDX] =
	    EVP_MD_size(ssl_digest_methods[SSL_MD_SHA256_IDX]);
	ssl_digest_methods[SSL_MD_SHA384_IDX] =
	    EVP_get_digestbyname(SN_sha384);
	ssl_mac_secret_size[SSL_MD_SHA384_IDX] =
	    EVP_MD_size(ssl_digest_methods[SSL_MD_SHA384_IDX]);
	ssl_digest_methods[SSL_MD_STREEBOG256_IDX] =
	    EVP_get_digestbyname(SN_id_tc26_gost3411_2012_256);
	ssl_mac_secret_size[SSL_MD_STREEBOG256_IDX] =
	    EVP_MD_size(ssl_digest_methods[SSL_MD_STREEBOG256_IDX]);
	ssl_digest_methods[SSL_MD_STREEBOG512_IDX] =
	    EVP_get_digestbyname(SN_id_tc26_gost3411_2012_512);
	ssl_mac_secret_size[SSL_MD_STREEBOG512_IDX] =
	    EVP_MD_size(ssl_digest_methods[SSL_MD_STREEBOG512_IDX]);
}

int
ssl_cipher_get_evp(const SSL_SESSION *s, const EVP_CIPHER **enc,
    const EVP_MD **md, int *mac_pkey_type, int *mac_secret_size)
{
	const SSL_CIPHER *c;
	int i;

	c = s->cipher;
	if (c == NULL)
		return (0);

	/*
	 * This function does not handle EVP_AEAD.
	 * See ssl_cipher_get_aead_evp instead.
	 */
	if (c->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD)
		return(0);

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

	switch (c->algorithm_enc) {
	case SSL_DES:
		i = SSL_ENC_DES_IDX;
		break;
	case SSL_3DES:
		i = SSL_ENC_3DES_IDX;
		break;
	case SSL_RC4:
		i = SSL_ENC_RC4_IDX;
		break;
	case SSL_IDEA:
		i = SSL_ENC_IDEA_IDX;
		break;
	case SSL_eNULL:
		i = SSL_ENC_NULL_IDX;
		break;
	case SSL_AES128:
		i = SSL_ENC_AES128_IDX;
		break;
	case SSL_AES256:
		i = SSL_ENC_AES256_IDX;
		break;
	case SSL_CAMELLIA128:
		i = SSL_ENC_CAMELLIA128_IDX;
		break;
	case SSL_CAMELLIA256:
		i = SSL_ENC_CAMELLIA256_IDX;
		break;
	case SSL_eGOST2814789CNT:
		i = SSL_ENC_GOST89_IDX;
		break;
	case SSL_AES128GCM:
		i = SSL_ENC_AES128GCM_IDX;
		break;
	case SSL_AES256GCM:
		i = SSL_ENC_AES256GCM_IDX;
		break;
	default:
		i = -1;
		break;
	}

	if ((i < 0) || (i >= SSL_ENC_NUM_IDX))
		*enc = NULL;
	else {
		if (i == SSL_ENC_NULL_IDX)
			*enc = EVP_enc_null();
		else
			*enc = ssl_cipher_methods[i];
	}

	switch (c->algorithm_mac) {
	case SSL_MD5:
		i = SSL_MD_MD5_IDX;
		break;
	case SSL_SHA1:
		i = SSL_MD_SHA1_IDX;
		break;
	case SSL_SHA256:
		i = SSL_MD_SHA256_IDX;
		break;
	case SSL_SHA384:
		i = SSL_MD_SHA384_IDX;
		break;
	case SSL_GOST94:
		i = SSL_MD_GOST94_IDX;
		break;
	case SSL_GOST89MAC:
		i = SSL_MD_GOST89MAC_IDX;
		break;
	case SSL_STREEBOG256:
		i = SSL_MD_STREEBOG256_IDX;
		break;
	case SSL_STREEBOG512:
		i = SSL_MD_STREEBOG512_IDX;
		break;
	default:
		i = -1;
		break;
	}
	if ((i < 0) || (i >= SSL_MD_NUM_IDX)) {
		*md = NULL;

		if (mac_pkey_type != NULL)
			*mac_pkey_type = NID_undef;
		if (mac_secret_size != NULL)
			*mac_secret_size = 0;
		if (c->algorithm_mac == SSL_AEAD)
			mac_pkey_type = NULL;
	} else {
		*md = ssl_digest_methods[i];
		if (mac_pkey_type != NULL)
			*mac_pkey_type = ssl_mac_pkey_id[i];
		if (mac_secret_size != NULL)
			*mac_secret_size = ssl_mac_secret_size[i];
	}

	if ((*enc != NULL) &&
	    (*md != NULL || (EVP_CIPHER_flags(*enc)&EVP_CIPH_FLAG_AEAD_CIPHER)) &&
	    (!mac_pkey_type || *mac_pkey_type != NID_undef)) {
		const EVP_CIPHER *evp;

		if (s->ssl_version >> 8 != TLS1_VERSION_MAJOR ||
		    s->ssl_version < TLS1_VERSION)
			return 1;

		if (c->algorithm_enc == SSL_RC4 &&
		    c->algorithm_mac == SSL_MD5 &&
		    (evp = EVP_get_cipherbyname("RC4-HMAC-MD5")))
			*enc = evp, *md = NULL;
		else if (c->algorithm_enc == SSL_AES128 &&
		    c->algorithm_mac == SSL_SHA1 &&
		    (evp = EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA1")))
			*enc = evp, *md = NULL;
		else if (c->algorithm_enc == SSL_AES256 &&
		    c->algorithm_mac == SSL_SHA1 &&
		    (evp = EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA1")))
			*enc = evp, *md = NULL;
		return (1);
	} else
		return (0);
}

/*
 * 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 *s, const EVP_AEAD **aead)
{
	const SSL_CIPHER *c = s->cipher;

	*aead = NULL;

	if (c == NULL)
		return 0;
	if ((c->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD) == 0)
		return 0;

	switch (c->algorithm_enc) {
#ifndef OPENSSL_NO_AES
	case SSL_AES128GCM:
		*aead = EVP_aead_aes_128_gcm();
		return 1;
	case SSL_AES256GCM:
		*aead = EVP_aead_aes_256_gcm();
		return 1;
#endif
#if !defined(OPENSSL_NO_CHACHA) && !defined(OPENSSL_NO_POLY1305)
	case SSL_CHACHA20POLY1305:
		*aead = EVP_aead_chacha20_poly1305();
		return 1;
#endif
	default:
		break;
	}
	return 0;
}

int
ssl_get_handshake_digest(int idx, long *mask, const EVP_MD **md)
{
	if (idx < 0 || idx >= SSL_MD_NUM_IDX) {
		return 0;
	}
	*mask = ssl_handshake_digest_flag[idx];
	if (*mask)
		*md = ssl_digest_methods[idx];
	else
		*md = NULL;
	return 1;
}

#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_94) == NULL)
		*auth |= SSL_aGOST94;
	if (EVP_PKEY_meth_find(NID_id_GostR3410_2001) == NULL)
		*auth |= SSL_aGOST01;
	if (((~*auth) & (SSL_aGOST94|SSL_aGOST01)) == 0)
		*mkey |= SSL_kGOST;

#ifdef SSL_FORBID_ENULL
	*enc |= SSL_eNULL;
#endif

	*enc |= (ssl_cipher_methods[SSL_ENC_DES_IDX ] == NULL) ? SSL_DES : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_3DES_IDX] == NULL) ? SSL_3DES : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_RC4_IDX ] == NULL) ? SSL_RC4 : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_IDEA_IDX] == NULL) ? SSL_IDEA : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_AES128_IDX] == NULL) ? SSL_AES128 : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_AES256_IDX] == NULL) ? SSL_AES256 : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_AES128GCM_IDX] == NULL) ? SSL_AES128GCM : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_AES256GCM_IDX] == NULL) ? SSL_AES256GCM : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA128_IDX] == NULL) ? SSL_CAMELLIA128 : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_CAMELLIA256_IDX] == NULL) ? SSL_CAMELLIA256 : 0;
	*enc |= (ssl_cipher_methods[SSL_ENC_GOST89_IDX] == NULL) ? SSL_eGOST2814789CNT : 0;

	*mac |= (ssl_digest_methods[SSL_MD_MD5_IDX ] == NULL) ? SSL_MD5 : 0;
	*mac |= (ssl_digest_methods[SSL_MD_SHA1_IDX] == NULL) ? SSL_SHA1 : 0;
	*mac |= (ssl_digest_methods[SSL_MD_SHA256_IDX] == NULL) ? SSL_SHA256 : 0;
	*mac |= (ssl_digest_methods[SSL_MD_SHA384_IDX] == NULL) ? SSL_SHA384 : 0;
	*mac |= (ssl_digest_methods[SSL_MD_GOST94_IDX] == NULL) ? SSL_GOST94 : 0;
	*mac |= (ssl_digest_methods[SSL_MD_GOST89MAC_IDX] == NULL) ? SSL_GOST89MAC : 0;
	*mac |= (ssl_digest_methods[SSL_MD_STREEBOG256_IDX] == NULL) ? SSL_STREEBOG256 : 0;
	*mac |= (ssl_digest_methods[SSL_MD_STREEBOG512_IDX] == NULL) ? SSL_STREEBOG512 : 0;

}

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 those that use any of that is not available */
		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;

		/*
		 * 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) {
		SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT, 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)
{
	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;

	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 = *(++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.
				 */
				SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
				    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;
			} 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))
				ok = ssl_cipher_strength_sort(head_p, tail_p);
			else
				SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
				    SSL_R_INVALID_COMMAND);
			if (ok == 0)
				retval = 0;
			/*
			 * We do not support any "multi" options
			 * together with "@", so throw away the
			 * rest of the command, if any left, until
			 * end or ':' is found.
			 */
			while ((*l != '\0') && !ITEM_SEP(*l))
				l++;
		} else if (found) {
			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);
}

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_by_id,
    const char *rule_str)
{
	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, *tmp_cipher_list;
	const char *rule_p;
	CIPHER_ORDER *co_list = NULL, *head = NULL, *tail = NULL, *curr;
	const SSL_CIPHER **ca_list = NULL;

	/*
	 * Return with error if nothing to do.
	 */
	if (rule_str == NULL || cipher_list == NULL || cipher_list_by_id == 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 = ssl_method->num_ciphers();
	co_list = reallocarray(NULL, num_of_ciphers, sizeof(CIPHER_ORDER));
	if (co_list == NULL) {
		SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, 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);

	/*
	 * 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, 0, SSL_aECDH, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
	ssl_cipher_apply_rule(0, SSL_kRSA, 0, 0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);

	/* RC4 is sort-of broken -- move the 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);


	/*
	 * 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);
		SSLerr(SSL_F_SSL_CREATE_CIPHER_LIST, 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);
		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);

	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);
	}

	/*
	 * The cipher selection for the list is done. The ciphers are added
	 * to the resulting precedence to the STACK_OF(SSL_CIPHER).
	 */
	for (curr = head; curr != NULL; curr = curr->next) {
		if (curr->active) {
			sk_SSL_CIPHER_push(cipherstack, curr->cipher);
		}
	}
	free(co_list);	/* Not needed any longer */

	tmp_cipher_list = sk_SSL_CIPHER_dup(cipherstack);
	if (tmp_cipher_list == NULL) {
		sk_SSL_CIPHER_free(cipherstack);
		return NULL;
	}
	if (*cipher_list != NULL)
		sk_SSL_CIPHER_free(*cipher_list);
	*cipher_list = cipherstack;
	if (*cipher_list_by_id != NULL)
		sk_SSL_CIPHER_free(*cipher_list_by_id);
	*cipher_list_by_id = tmp_cipher_list;
	(void)sk_SSL_CIPHER_set_cmp_func(*cipher_list_by_id,
	    ssl_cipher_ptr_id_cmp);

	sk_SSL_CIPHER_sort(*cipher_list_by_id);
	return (cipherstack);
}

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
		ver = "unknown";

	switch (alg_mkey) {
	case SSL_kRSA:
		kx = "RSA";
		break;
	case SSL_kDHE:
		kx = "DH";
		break;
	case SSL_kECDHr:
		kx = "ECDH/RSA";
		break;
	case SSL_kECDHe:
		kx = "ECDH/ECDSA";
		break;
	case SSL_kECDHE:
		kx = "ECDH";
		break;
	case SSL_kGOST:
		kx = "GOST";
		break;
	default:
		kx = "unknown";
	}

	switch (alg_auth) {
	case SSL_aRSA:
		au = "RSA";
		break;
	case SSL_aDSS:
		au = "DSS";
		break;
	case SSL_aECDH:
		au = "ECDH";
		break;
	case SSL_aNULL:
		au = "None";
		break;
	case SSL_aECDSA:
		au = "ECDSA";
		break;
	case SSL_aGOST94:
		au = "GOST94";
		break;
	case SSL_aGOST01:
		au = "GOST01";
		break;
	default:
		au = "unknown";
		break;
	}

	switch (alg_enc) {
	case SSL_DES:
		enc = "DES(56)";
		break;
	case SSL_3DES:
		enc = "3DES(168)";
		break;
	case SSL_RC4:
		enc = alg2 & SSL2_CF_8_BYTE_ENC ? "RC4(64)" : "RC4(128)";
		break;
	case SSL_IDEA:
		enc = "IDEA(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;
	case SSL_STREEBOG512:
		mac = "STREEBOG512";
		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);
}

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;
}

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;
}
