text: /* 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
  			fprintf(stderr,"\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
  	fprintf(stderr, "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
  			fprintf(stderr, "\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
  		fprintf(stderr, "Action = %d\n", rule);
  #endif
  
  		/* 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 = OPENSSL_malloc((max_strength_bits + 1) * sizeof(int));
  	if (!number_uses)
  		{
  		SSLerr(SSL_F_SSL_CIPHER_STRENGTH_SORT,ERR_R_MALLOC_FAILURE);
  		return(0);
  		}
  	memset(number_uses, 0, (max_strength_bits + 1) * sizeof(int));
  
  	/*
  	 * 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);
  
  	OPENSSL_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, algo_strength;
  	const char *l, *buf;
  	int j, multi, found, rule, retval, ok, buflen;
  	unsigned long cipher_id = 0;
  	char ch;
  
  	retval = 1;
  	l = rule_str;
  	for (;;)
  		{
  		ch = *l;
  
  		if (ch == '\0')
  			break;		/* done */
  		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;
  #ifndef CHARSET_EBCDIC
  			while (	((ch >= 'A') && (ch <= 'Z')) ||
  				((ch >= '0') && (ch <= '9')) ||
  				((ch >= 'a') && (ch <= 'z')) ||
  				 (ch == '-') || (ch == '.'))
  #else
  			while (	isalnum(ch) || (ch == '-') || (ch == '.'))
  #endif
  				 {
  				 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)
  				{
  				found = 0; /* unused -- avoid compiler warning */
  				break;	/* special treatment */
  				}
  
  			/* 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_EXP_MASK)
  				{
  				if (algo_strength & SSL_EXP_MASK)
  					{
  					algo_strength &= (ca_list[j]->algo_strength & SSL_EXP_MASK) | ~SSL_EXP_MASK;
  					if (!(algo_strength & SSL_EXP_MASK)) { found = 0; break; }
  					}
  				else
  					algo_strength |= ca_list[j]->algo_strength & SSL_EXP_MASK;
  				}
  
  			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();
  #ifdef KSSL_DEBUG
  	fprintf(stderr,"ssl_create_cipher_list() for %d ciphers\n", num_of_ciphers);
  #endif    /* KSSL_DEBUG */
  	co_list = (CIPHER_ORDER *)OPENSSL_malloc(sizeof(CIPHER_ORDER) * num_of_ciphers);
  	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_kEECDH, 0, 0, 0, 0, 0, CIPHER_ADD, -1, &head, &tail);
  	ssl_cipher_apply_rule(0, SSL_kEECDH, 0, 0, 0, 0, 0, CIPHER_DEL, -1, &head, &tail);
  
  	/* AES is our preferred symmetric cipher */
  	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, 0, SSL_aDH, 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);
  	ssl_cipher_apply_rule(0, SSL_kPSK, 0,0, 0, 0, 0, CIPHER_ORD, -1, &head, &tail);
  	ssl_cipher_apply_rule(0, SSL_kKRB5, 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))
  		{
  		OPENSSL_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 = OPENSSL_malloc(sizeof(SSL_CIPHER *) * num_of_alias_max);
  	if (ca_list == NULL)
  		{
  		OPENSSL_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);
  
  	OPENSSL_free((void *)ca_list);	/* Not needed anymore */
  
  	if (!ok)
  		{	/* Rule processing failure */
  		OPENSSL_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)
  		{
  		OPENSSL_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)
  		{
  #ifdef OPENSSL_FIPS
  		if (curr->active && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS))
  #else
  		if (curr->active)
  #endif
  			{
  			sk_SSL_CIPHER_push(cipherstack, curr->cipher);
  #ifdef CIPHER_DEBUG
  			fprintf(stderr, "<%s>\n",curr->cipher->name);
  #endif
  			}
  		}
  	OPENSSL_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)
  	{
  	int is_export,pkl,kl;
  	const char *ver,*exp_str;
  	const char *kx,*au,*enc,*mac;
  	unsigned long alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl,alg2;
  #ifdef KSSL_DEBUG
  	static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s AL=%lx/%lx/%lx/%lx/%lx\n";
  #else
  	static const char *format="%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s%s\n";
  #endif /* KSSL_DEBUG */
  
  	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;
  
  	is_export=SSL_C_IS_EXPORT(cipher);
  	pkl=SSL_C_EXPORT_PKEYLENGTH(cipher);
  	kl=SSL_C_EXPORT_KEYLENGTH(cipher);
  	exp_str=is_export?" export":"";
  	
  	if (alg_ssl & SSL_SSLV2)
  		ver="SSLv2";
  	else 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=is_export?(pkl == 512 ? "RSA(512)" : "RSA(1024)"):"RSA";
  		break;
  	case SSL_kDHr:
  		kx="DH/RSA";
  		break;
  	case SSL_kDHd:
  		kx="DH/DSS";
  		break;
          case SSL_kKRB5:
  		kx="KRB5";
  		break;
  	case SSL_kEDH:
  		kx=is_export?(pkl == 512 ? "DH(512)" : "DH(1024)"):"DH";
  		break;
  	case SSL_kECDHr:
  		kx="ECDH/RSA";
  		break;
  	case SSL_kECDHe:
  		kx="ECDH/ECDSA";
  		break;
  	case SSL_kEECDH:
  		kx="ECDH";
  		break;
  	case SSL_kPSK:
  		kx="PSK";
  		break;
  	case SSL_kSRP:
  		kx="SRP";
  		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_aDH:
  		au="DH";
  		break;
          case SSL_aKRB5:
  		au="KRB5";
  		break;
          case SSL_aECDH:
  		au="ECDH";
  		break;
  	case SSL_aNULL:
  		au="None";
  		break;
  	case SSL_aECDSA:
  		au="ECDSA";
  		break;
  	case SSL_aPSK:
  		au="PSK";
  		break;
  	case SSL_aSRP:
  		au="SRP";
  		break;
  	case SSL_aGOST94:
  		au="GOST94";
  		break;
  	case SSL_aGOST01:
  		au="GOST01";
  		break;
  	default:
  		au="unknown";
  		break;
  		}
  
  	switch (alg_enc)
  		{
  	case SSL_DES:
  		enc=(is_export && kl == 5)?"DES(40)":"DES(56)";
  		break;
  	case SSL_3DES:
  		enc="3DES(168)";
  		break;
  	case SSL_RC4:
  		enc=is_export?(kl == 5 ? "RC4(40)" : "RC4(56)")
  		  :((alg2&SSL2_CF_8_BYTE_ENC)?"RC4(64)":"RC4(128)");
  		break;
  	case SSL_RC2:
  		enc=is_export?(kl == 5 ? "RC2(40)" : "RC2(56)"):"RC2(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_SEED:
  		enc="SEED(128)";
  		break;
  	case SSL_eGOST2814789CNT:
  		enc="GOST89(256)";
  		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_GOST89MAC:
  		mac="GOST89";
  		break;
  	case SSL_GOST94:
  		mac="GOST94";
  		break;
  	default:
  		mac="unknown";
  		break;
  		}
  
  	if (buf == NULL)
  		{
  		len=128;
  		buf=OPENSSL_malloc(len);
  		if (buf == NULL) return("OPENSSL_malloc Error");
  		}
  	else if (len < 128)
  		return("Buffer too small");
  
  #ifdef KSSL_DEBUG
  	BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str,alg_mkey,alg_auth,alg_enc,alg_mac,alg_ssl);
  #else
  	BIO_snprintf(buf,len,format,cipher->name,ver,kx,au,enc,mac,exp_str);
  #endif /* KSSL_DEBUG */
  	return(buf);
  	}
  
  char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
  	{
  	int i;
  
  	if (c == NULL) return("(NONE)");
  	i=(int)(c->id>>24L);
  	if (i == 3)
  		return("TLSv1/SSLv3");
  	else if (i == 2)
  		return("SSLv2");
  	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;
  	}
  
  SSL_COMP *ssl3_comp_find(STACK_OF(SSL_COMP) *sk, int n)
  	{
  	SSL_COMP *ctmp;
  	int i,nn;
  
  	if ((n == 0) || (sk == NULL)) return(NULL);
  	nn=sk_SSL_COMP_num(sk);
  	for (i=0; i<nn; i++)
  		{
  		ctmp=sk_SSL_COMP_value(sk,i);
  		if (ctmp->id == n)
  			return(ctmp);
  		}
  	return(NULL);
  	}
  
  #ifdef OPENSSL_NO_COMP
  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;
  	}
  #else
  STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
  	{
  	load_builtin_compressions();
  	return(ssl_comp_methods);
  	}
  
  int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
  	{
  	SSL_COMP *comp;
  
          if (cm == NULL || cm->type == NID_undef)
                  return 1;
  
  	/* According to draft-ietf-tls-compression-04.txt, the
  	   compression number ranges should be the following:
  
  	   0 to 63:    methods defined by the IETF
  	   64 to 192:  external party methods assigned by IANA
  	   193 to 255: reserved for private use */
  	if (id < 193 || id > 255)
  		{
  		SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_COMPRESSION_ID_NOT_WITHIN_PRIVATE_RANGE);
  		return 0;
  		}
  
  	MemCheck_off();
  	comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
  	comp->id=id;
  	comp->method=cm;
  	load_builtin_compressions();
  	if (ssl_comp_methods
  		&& sk_SSL_COMP_find(ssl_comp_methods,comp) >= 0)
  		{
  		OPENSSL_free(comp);
  		MemCheck_on();
  		SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,SSL_R_DUPLICATE_COMPRESSION_ID);
  		return(1);
  		}
  	else if ((ssl_comp_methods == NULL)
  		|| !sk_SSL_COMP_push(ssl_comp_methods,comp))
  		{
  		OPENSSL_free(comp);
  		MemCheck_on();
  		SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
  		return(1);
  		}
  	else
  		{
  		MemCheck_on();
  		return(0);
  		}
  	}
  
  const char *SSL_COMP_get_name(const COMP_METHOD *comp)
  	{
  	if (comp)
  		return comp->name;
  	return NULL;
  	}
  
  #endif
  