ssl_ciph.c

/* ssl/ssl_ciph.c */
/* 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_COMP
#include <openssl/comp.h>
#endif
#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_RC2_IDX		3
#define SSL_ENC_IDEA_IDX	4
#define SSL_ENC_NULL_IDX	5
#define SSL_ENC_AES128_IDX	6
#define SSL_ENC_AES256_IDX	7
#define SSL_ENC_CAMELLIA128_IDX	8
#define SSL_ENC_CAMELLIA256_IDX	9
#define SSL_ENC_GOST89_IDX	10
#define SSL_ENC_SEED_IDX    	11
#define SSL_ENC_AES128GCM_IDX	12
#define SSL_ENC_AES256GCM_IDX	13
#define SSL_ENC_NUM_IDX		14


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

#define SSL_COMP_NULL_IDX	0
#define SSL_COMP_ZLIB_IDX	1
#define SSL_COMP_NUM_IDX	2

static STACK_OF(SSL_COMP) *ssl_comp_methods=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
/*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
	};
/* PKEY_TYPE for GOST89MAC is known in advance, but, because
 * implementation is engine-provided, we'll fill it only if
 * corresponding EVP_PKEY_METHOD is found 
 */
static int  ssl_mac_pkey_id[SSL_MD_NUM_IDX]={
	EVP_PKEY_HMAC,EVP_PKEY_HMAC,EVP_PKEY_HMAC,NID_undef,
	EVP_PKEY_HMAC,EVP_PKEY_HMAC
	};

static int ssl_mac_secret_size[SSL_MD_NUM_IDX]={
	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
	};

#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) */
	{0,SSL_TXT_ALL,0,     0,0,~SSL_eNULL,0,0,0,0,0,0},
	/* "COMPLEMENTOFALL" */
	{0,SSL_TXT_CMPALL,0,  0,0,SSL_eNULL,0,0,0,0,0,0},

	/* "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in ALL!) */
	{0,SSL_TXT_CMPDEF,0,  SSL_kEDH|SSL_kEECDH,SSL_aNULL,~SSL_eNULL,0,0,0,0,0,0},

	/* 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) */
	{0,SSL_TXT_kRSA,0,    SSL_kRSA,  0,0,0,0,0,0,0,0},

	{0,SSL_TXT_kDHr,0,    SSL_kDHr,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
	{0,SSL_TXT_kDHd,0,    SSL_kDHd,  0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
	{0,SSL_TXT_kDH,0,     SSL_kDHr|SSL_kDHd,0,0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
	{0,SSL_TXT_kEDH,0,    SSL_kEDH,  0,0,0,0,0,0,0,0},
	{0,SSL_TXT_DH,0,      SSL_kDHr|SSL_kDHd|SSL_kEDH,0,0,0,0,0,0,0,0},

	{0,SSL_TXT_kKRB5,0,   SSL_kKRB5, 0,0,0,0,0,0,0,0},

	{0,SSL_TXT_kECDHr,0,  SSL_kECDHr,0,0,0,0,0,0,0,0},
	{0,SSL_TXT_kECDHe,0,  SSL_kECDHe,0,0,0,0,0,0,0,0},
	{0,SSL_TXT_kECDH,0,   SSL_kECDHr|SSL_kECDHe,0,0,0,0,0,0,0,0},
	{0,SSL_TXT_kEECDH,0,  SSL_kEECDH,0,0,0,0,0,0,0,0},
	{0,SSL_TXT_ECDH,0,    SSL_kECDHr|SSL_kECDHe|SSL_kEECDH,0,0,0,0,0,0,0,0},

        {0,SSL_TXT_kPSK,0,    SSL_kPSK,  0,0,0,0,0,0,0,0},
	{0,SSL_TXT_kSRP,0,    SSL_kSRP,  0,0,0,0,0,0,0,0},
	{0,SSL_TXT_kGOST,0, SSL_kGOST,0,0,0,0,0,0,0,0},

	/* server authentication aliases */
	{0,SSL_TXT_aRSA,0,    0,SSL_aRSA,  0,0,0,0,0,0,0},
	{0,SSL_TXT_aDSS,0,    0,SSL_aDSS,  0,0,0,0,0,0,0},
	{0,SSL_TXT_DSS,0,     0,SSL_aDSS,   0,0,0,0,0,0,0},
	{0,SSL_TXT_aKRB5,0,   0,SSL_aKRB5, 0,0,0,0,0,0,0},
	{0,SSL_TXT_aNULL,0,   0,SSL_aNULL, 0,0,0,0,0,0,0},
	{0,SSL_TXT_aDH,0,     0,SSL_aDH,   0,0,0,0,0,0,0}, /* no such ciphersuites supported! */
	{0,SSL_TXT_aECDH,0,   0,SSL_aECDH, 0,0,0,0,0,0,0},
	{0,SSL_TXT_aECDSA,0,  0,SSL_aECDSA,0,0,0,0,0,0,0},
	{0,SSL_TXT_ECDSA,0,   0,SSL_aECDSA, 0,0,0,0,0,0,0},
        {0,SSL_TXT_aPSK,0,    0,SSL_aPSK,  0,0,0,0,0,0,0},
	{0,SSL_TXT_aGOST94,0,0,SSL_aGOST94,0,0,0,0,0,0,0},
	{0,SSL_TXT_aGOST01,0,0,SSL_aGOST01,0,0,0,0,0,0,0},
	{0,SSL_TXT_aGOST,0,0,SSL_aGOST94|SSL_aGOST01,0,0,0,0,0,0,0},
	{0,SSL_TXT_aSRP,0,    0,SSL_aSRP,  0,0,0,0,0,0,0},

	/* aliases combining key exchange and server authentication */
	{0,SSL_TXT_EDH,0,     SSL_kEDH,~SSL_aNULL,0,0,0,0,0,0,0},
	{0,SSL_TXT_EECDH,0,   SSL_kEECDH,~SSL_aNULL,0,0,0,0,0,0,0},
	{0,SSL_TXT_NULL,0,    0,0,SSL_eNULL, 0,0,0,0,0,0},
	{0,SSL_TXT_KRB5,0,    SSL_kKRB5,SSL_aKRB5,0,0,0,0,0,0,0},
	{0,SSL_TXT_RSA,0,     SSL_kRSA,SSL_aRSA,0,0,0,0,0,0,0},
	{0,SSL_TXT_ADH,0,     SSL_kEDH,SSL_aNULL,0,0,0,0,0,0,0},
	{0,SSL_TXT_AECDH,0,   SSL_kEECDH,SSL_aNULL,0,0,0,0,0,0,0},
        {0,SSL_TXT_PSK,0,     SSL_kPSK,SSL_aPSK,0,0,0,0,0,0,0},
	{0,SSL_TXT_SRP,0,     SSL_kSRP,0,0,0,0,0,0,0,0},


	/* symmetric encryption aliases */
	{0,SSL_TXT_DES,0,     0,0,SSL_DES,   0,0,0,0,0,0},
	{0,SSL_TXT_3DES,0,    0,0,SSL_3DES,  0,0,0,0,0,0},
	{0,SSL_TXT_RC4,0,     0,0,SSL_RC4,   0,0,0,0,0,0},
	{0,SSL_TXT_RC2,0,     0,0,SSL_RC2,   0,0,0,0,0,0},
	{0,SSL_TXT_IDEA,0,    0,0,SSL_IDEA,  0,0,0,0,0,0},
	{0,SSL_TXT_SEED,0,    0,0,SSL_SEED,  0,0,0,0,0,0},
	{0,SSL_TXT_eNULL,0,   0,0,SSL_eNULL, 0,0,0,0,0,0},
	{0,SSL_TXT_AES128,0,  0,0,SSL_AES128|SSL_AES128GCM,0,0,0,0,0,0},
	{0,SSL_TXT_AES256,0,  0,0,SSL_AES256|SSL_AES256GCM,0,0,0,0,0,0},
	{0,SSL_TXT_AES,0,     0,0,SSL_AES,0,0,0,0,0,0},
	{0,SSL_TXT_AES_GCM,0, 0,0,SSL_AES128GCM|SSL_AES256GCM,0,0,0,0,0,0},
	{0,SSL_TXT_CAMELLIA128,0,0,0,SSL_CAMELLIA128,0,0,0,0,0,0},
	{0,SSL_TXT_CAMELLIA256,0,0,0,SSL_CAMELLIA256,0,0,0,0,0,0},
	{0,SSL_TXT_CAMELLIA   ,0,0,0,SSL_CAMELLIA128|SSL_CAMELLIA256,0,0,0,0,0,0},

	/* MAC aliases */	
	{0,SSL_TXT_MD5,0,     0,0,0,SSL_MD5,   0,0,0,0,0},
	{0,SSL_TXT_SHA1,0,    0,0,0,SSL_SHA1,  0,0,0,0,0},
	{0,SSL_TXT_SHA,0,     0,0,0,SSL_SHA1,  0,0,0,0,0},
	{0,SSL_TXT_GOST94,0,     0,0,0,SSL_GOST94,  0,0,0,0,0},
	{0,SSL_TXT_GOST89MAC,0,     0,0,0,SSL_GOST89MAC,  0,0,0,0,0},
	{0,SSL_TXT_SHA256,0,    0,0,0,SSL_SHA256,  0,0,0,0,0},
	{0,SSL_TXT_SHA384,0,    0,0,0,SSL_SHA384,  0,0,0,0,0},

	/* protocol version aliases */
	{0,SSL_TXT_SSLV2,0,   0,0,0,0,SSL_SSLV2, 0,0,0,0},
	{0,SSL_TXT_SSLV3,0,   0,0,0,0,SSL_SSLV3, 0,0,0,0},
	{0,SSL_TXT_TLSV1,0,   0,0,0,0,SSL_TLSV1, 0,0,0,0},
	{0,SSL_TXT_TLSV1_2,0, 0,0,0,0,SSL_TLSV1_2, 0,0,0,0},

	/* export flag */
	{0,SSL_TXT_EXP,0,     0,0,0,0,0,SSL_EXPORT,0,0,0},
	{0,SSL_TXT_EXPORT,0,  0,0,0,0,0,SSL_EXPORT,0,0,0},

	/* strength classes */
	{0,SSL_TXT_EXP40,0,   0,0,0,0,0,SSL_EXP40, 0,0,0},
	{0,SSL_TXT_EXP56,0,   0,0,0,0,0,SSL_EXP56, 0,0,0},
	{0,SSL_TXT_LOW,0,     0,0,0,0,0,SSL_LOW,   0,0,0},
	{0,SSL_TXT_MEDIUM,0,  0,0,0,0,0,SSL_MEDIUM,0,0,0},
	{0,SSL_TXT_HIGH,0,    0,0,0,0,0,SSL_HIGH,  0,0,0},
	/* FIPS 140-2 approved ciphersuite */
	{0,SSL_TXT_FIPS,0,    0,0,~SSL_eNULL,0,0,SSL_FIPS,  0,0,0},
	};
/* Search for public key algorithm with given name and 
 * return its pkey_id if it is available. Otherwise return 0
 */
#ifdef OPENSSL_NO_ENGINE

static int get_optional_pkey_id(const char *pkey_name)
	{
	const EVP_PKEY_ASN1_METHOD *ameth;
	int pkey_id=0;
	ameth = EVP_PKEY_asn1_find_str(NULL,pkey_name,-1);
	if (ameth) 
		{
		EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
		}		
	return pkey_id;
	}

#else

static int get_optional_pkey_id(const char *pkey_name)
	{
	const EVP_PKEY_ASN1_METHOD *ameth;
	ENGINE *tmpeng = NULL;
	int pkey_id=0;
	ameth = EVP_PKEY_asn1_find_str(&tmpeng,pkey_name,-1);
	if (ameth)
		{
		EVP_PKEY_asn1_get0_info(&pkey_id, NULL,NULL,NULL,NULL,ameth);
		}
	if (tmpeng) ENGINE_finish(tmpeng);
	return pkey_id;
	}

#endif

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);
	ssl_cipher_methods[SSL_ENC_RC2_IDX]= 
		EVP_get_cipherbyname(SN_rc2_cbc);
#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_SEED_IDX]=
	  EVP_get_cipherbyname(SN_seed_cbc);

	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);
		ssl_mac_pkey_id[SSL_MD_GOST89MAC_IDX] = get_optional_pkey_id("gost-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]);
	}
#ifndef OPENSSL_NO_COMP

static int sk_comp_cmp(const SSL_COMP * const *a,
			const SSL_COMP * const *b)
	{
	return((*a)->id-(*b)->id);
	}

static void load_builtin_compressions(void)
	{
	int got_write_lock = 0;

	CRYPTO_r_lock(CRYPTO_LOCK_SSL);
	if (ssl_comp_methods == NULL)
		{
		CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
		CRYPTO_w_lock(CRYPTO_LOCK_SSL);
		got_write_lock = 1;
		
		if (ssl_comp_methods == NULL)
			{
			SSL_COMP *comp = NULL;

			MemCheck_off();
			ssl_comp_methods=sk_SSL_COMP_new(sk_comp_cmp);
			if (ssl_comp_methods != NULL)
				{
				comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
				if (comp != NULL)
					{
					comp->method=COMP_zlib();
					if (comp->method
						&& comp->method->type == NID_undef)
						OPENSSL_free(comp);
					else
						{
						comp->id=SSL_COMP_ZLIB_IDX;
						comp->name=comp->method->name;
						sk_SSL_COMP_push(ssl_comp_methods,comp);
						}
					}
					sk_SSL_COMP_sort(ssl_comp_methods);
				}
			MemCheck_on();
			}
		}
	
	if (got_write_lock)
		CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
	else
		CRYPTO_r_unlock(CRYPTO_LOCK_SSL);
	}
#endif

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,SSL_COMP **comp)
	{
	int i;
	const SSL_CIPHER *c;

	c=s->cipher;
	if (c == NULL) return(0);
	if (comp != NULL)
		{
		SSL_COMP ctmp;
#ifndef OPENSSL_NO_COMP
		load_builtin_compressions();
#endif

		*comp=NULL;
		ctmp.id=s->compress_meth;
		if (ssl_comp_methods != NULL)
			{
			i=sk_SSL_COMP_find(ssl_comp_methods,&ctmp);
			if (i >= 0)
				*comp=sk_SSL_COMP_value(ssl_comp_methods,i);
			else
				*comp=NULL;
			}
		}

	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_RC2:
		i=SSL_ENC_RC2_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_SEED:
		i=SSL_ENC_SEED_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;
	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;

#ifdef OPENSSL_FIPS
		if (FIPS_mode())
			return 1;
#endif

		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);
	}

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;

#ifdef OPENSSL_NO_RSA
	*mkey |= SSL_kRSA;
	*auth |= SSL_aRSA;
#endif
#ifdef OPENSSL_NO_DSA
	*auth |= SSL_aDSS;
#endif
	*mkey |= SSL_kDHr|SSL_kDHd; /* no such ciphersuites supported! */
	*auth |= SSL_aDH;
#ifdef OPENSSL_NO_DH
	*mkey |= SSL_kDHr|SSL_kDHd|SSL_kEDH;
	*auth |= SSL_aDH;
#endif
#ifdef OPENSSL_NO_KRB5
	*mkey |= SSL_kKRB5;
	*auth |= SSL_aKRB5;
#endif
#ifdef OPENSSL_NO_ECDSA
	*auth |= SSL_aECDSA;
#endif
#ifdef OPENSSL_NO_ECDH
	*mkey |= SSL_kECDHe|SSL_kECDHr;
	*auth |= SSL_aECDH;
#endif
#ifdef OPENSSL_NO_PSK
	*mkey |= SSL_kPSK;
	*auth |= SSL_aPSK;
#endif
#ifdef OPENSSL_NO_SRP
	*mkey |= SSL_kSRP;
#endif
	/* Check for presence of GOST 34.10 algorithms, and if they
	 * do not present, disable  appropriate auth and key exchange */
	if (!get_optional_pkey_id("gost94")) {
		*auth |= SSL_aGOST94;
	}
	if (!get_optional_pkey_id("gost2001")) {
		*auth |= SSL_aGOST01;
	}
	/* Disable GOST key exchange if no GOST signature algs are available * */
	if ((*auth & (SSL_aGOST94|SSL_aGOST01)) == (SSL_aGOST94|SSL_aGOST01)) {
		*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_RC2_IDX ] == NULL) ? SSL_RC2 :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;
	*enc |= (ssl_cipher_methods[SSL_ENC_SEED_IDX] == NULL) ? SSL_SEED: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_mac_pkey_id[SSL_MD_GOST89MAC_IDX]==NID_undef)? SSL_GOST89MAC: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 (SSLv2 and/or 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 &&
#ifdef OPENSSL_FIPS
		    (!FIPS_mode() || (c->algo_strength & SSL_FIPS)) &&
#endif
		    !(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++;
#ifdef KSSL_DEBUG
			printf("\t%d: %s %lx %lx %lx\n",i,c->name,c->id,c->algorithm_mkey,c->algorithm_auth);
#endif	/* KSSL_DEBUG */
			/*
			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;

#ifdef CIPHER_DEBUG
	printf("Applying rule %d with %08lx/%08lx/%08lx/%08lx/%08lx %08lx (%d)\n",
		rule, alg_mkey, alg_auth, alg_enc, alg_mac, alg_ssl, algo_strength, strength_bits);
#endif

	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;

		if (curr == NULL) break;

		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
			{
#ifdef CIPHER_DEBUG
			printf("\nName: %s:\nAlgo = %08lx/%08lx/%08lx/%08lx/%08lx Algo_strength = %08lx\n", cp->name, cp->algorithm_mkey, cp->algorithm_auth, cp->algorithm_enc, cp->algorithm_mac, cp->algorithm_ssl, cp->algo_strength);
#endif

			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_EXP_MASK) && !(algo_strength & SSL_EXP_MASK & cp->algo_strength))
				continue;
			if ((algo_strength & SSL_STRONG_MASK) && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
				continue;
			}

#ifdef CIPHER_DEBUG
		printf("Action = %d\n", rule);