text: /*
   * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  /* ====================================================================
   * 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 <ctype.h>
  #include <openssl/objects.h>
  #include <openssl/comp.h>
  #include <openssl/engine.h>
  #include <openssl/crypto.h>
  #include "ssl_locl.h"
  #include "internal/thread_once.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_AES128CCM_IDX   14
  #define SSL_ENC_AES256CCM_IDX   15
  #define SSL_ENC_AES128CCM8_IDX  16
  #define SSL_ENC_AES256CCM8_IDX  17
  #define SSL_ENC_GOST8912_IDX    18
  #define SSL_ENC_CHACHA_IDX      19
  #define SSL_ENC_NUM_IDX         20
  
  /* NB: make sure indices in these tables match values above */
  
  typedef struct {
      uint32_t mask;
      int nid;
  } ssl_cipher_table;
  
  /* Table of NIDs for each cipher */
  static const ssl_cipher_table ssl_cipher_table_cipher[SSL_ENC_NUM_IDX] = {
      {SSL_DES, NID_des_cbc},     /* SSL_ENC_DES_IDX 0 */
      {SSL_3DES, NID_des_ede3_cbc}, /* SSL_ENC_3DES_IDX 1 */
      {SSL_RC4, NID_rc4},         /* SSL_ENC_RC4_IDX 2 */
      {SSL_RC2, NID_rc2_cbc},     /* SSL_ENC_RC2_IDX 3 */
      {SSL_IDEA, NID_idea_cbc},   /* SSL_ENC_IDEA_IDX 4 */
      {SSL_eNULL, NID_undef},     /* SSL_ENC_NULL_IDX 5 */
      {SSL_AES128, NID_aes_128_cbc}, /* SSL_ENC_AES128_IDX 6 */
      {SSL_AES256, NID_aes_256_cbc}, /* SSL_ENC_AES256_IDX 7 */
      {SSL_CAMELLIA128, NID_camellia_128_cbc}, /* SSL_ENC_CAMELLIA128_IDX 8 */
      {SSL_CAMELLIA256, NID_camellia_256_cbc}, /* SSL_ENC_CAMELLIA256_IDX 9 */
      {SSL_eGOST2814789CNT, NID_gost89_cnt}, /* SSL_ENC_GOST89_IDX 10 */
      {SSL_SEED, NID_seed_cbc},   /* SSL_ENC_SEED_IDX 11 */
      {SSL_AES128GCM, NID_aes_128_gcm}, /* SSL_ENC_AES128GCM_IDX 12 */
      {SSL_AES256GCM, NID_aes_256_gcm}, /* SSL_ENC_AES256GCM_IDX 13 */
      {SSL_AES128CCM, NID_aes_128_ccm}, /* SSL_ENC_AES128CCM_IDX 14 */
      {SSL_AES256CCM, NID_aes_256_ccm}, /* SSL_ENC_AES256CCM_IDX 15 */
      {SSL_AES128CCM8, NID_aes_128_ccm}, /* SSL_ENC_AES128CCM8_IDX 16 */
      {SSL_AES256CCM8, NID_aes_256_ccm}, /* SSL_ENC_AES256CCM8_IDX 17 */
      {SSL_eGOST2814789CNT12, NID_gost89_cnt_12}, /* SSL_ENC_GOST8912_IDX */
      {SSL_CHACHA20POLY1305, NID_chacha20_poly1305},
  };
  
  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;
  
  #ifndef OPENSSL_NO_COMP
  static CRYPTO_ONCE ssl_load_builtin_comp_once = CRYPTO_ONCE_STATIC_INIT;
  #endif
  
  /*
   * 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
  
  /* NB: make sure indices in this table matches values above */
  static const ssl_cipher_table ssl_cipher_table_mac[SSL_MD_NUM_IDX] = {
      {SSL_MD5, NID_md5},         /* SSL_MD_MD5_IDX 0 */
      {SSL_SHA1, NID_sha1},       /* SSL_MD_SHA1_IDX 1 */
      {SSL_GOST94, NID_id_GostR3411_94}, /* SSL_MD_GOST94_IDX 2 */
      {SSL_GOST89MAC, NID_id_Gost28147_89_MAC}, /* SSL_MD_GOST89MAC_IDX 3 */
      {SSL_SHA256, NID_sha256},   /* SSL_MD_SHA256_IDX 4 */
      {SSL_SHA384, NID_sha384},   /* SSL_MD_SHA384_IDX 5 */
      {SSL_GOST12_256, NID_id_GostR3411_2012_256},  /* SSL_MD_GOST12_256_IDX 6 */
      {SSL_GOST89MAC12, NID_gost_mac_12},           /* SSL_MD_GOST89MAC12_IDX 7 */
      {SSL_GOST12_512, NID_id_GostR3411_2012_512},  /* SSL_MD_GOST12_512_IDX 8 */
      {0, NID_md5_sha1},          /* SSL_MD_MD5_SHA1_IDX 9 */
      {0, NID_sha224},            /* SSL_MD_SHA224_IDX 10 */
      {0, NID_sha512}             /* SSL_MD_SHA512_IDX 11 */
  };
  
  static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX] = {
      NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
  };
  
  static const ssl_cipher_table ssl_cipher_table_kx[] = {
      { SSL_kRSA,      NID_kx_rsa },
      { SSL_kECDHE,    NID_kx_ecdhe },
      { SSL_kDHE,      NID_kx_dhe },
      { SSL_kECDHEPSK, NID_kx_ecdhe_psk },
      { SSL_kDHEPSK,   NID_kx_dhe_psk },
      { SSL_kRSAPSK,   NID_kx_rsa_psk },
      { SSL_kPSK,      NID_kx_psk },
      { SSL_kSRP,      NID_kx_srp },
      { SSL_kGOST,     NID_kx_gost }
  };
  
  static const ssl_cipher_table ssl_cipher_table_auth[] = {
      { SSL_aRSA,    NID_auth_rsa },
      { SSL_aECDSA,  NID_auth_ecdsa },
      { SSL_aPSK,    NID_auth_psk },
      { SSL_aDSS,    NID_auth_dss },
      { SSL_aGOST01, NID_auth_gost01 },
      { SSL_aGOST12, NID_auth_gost12 },
      { SSL_aSRP,    NID_auth_srp },
      { SSL_aNULL,   NID_auth_null }
  };
  
  /* Utility function for table lookup */
  static int ssl_cipher_info_find(const ssl_cipher_table * table,
                                  size_t table_cnt, uint32_t mask)
  {
      size_t i;
      for (i = 0; i < table_cnt; i++, table++) {
          if (table->mask == mask)
              return i;
      }
      return -1;
  }
  
  #define ssl_cipher_info_lookup(table, x) \
      ssl_cipher_info_find(table, OSSL_NELEM(table), x)
  
  /*
   * 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] = {
      /* MD5, SHA, GOST94, MAC89 */
      EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, NID_undef,
      /* SHA256, SHA384, GOST2012_256, MAC89-12 */
      EVP_PKEY_HMAC, EVP_PKEY_HMAC, EVP_PKEY_HMAC, NID_undef,
      /* GOST2012_512 */
      EVP_PKEY_HMAC,
  };
  
  static int ssl_mac_secret_size[SSL_MD_NUM_IDX] = {
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  };
  
  #define CIPHER_ADD      1
  #define CIPHER_KILL     2
  #define CIPHER_DEL      3
  #define CIPHER_ORD      4
  #define CIPHER_SPECIAL  5
  /*
   * Bump the ciphers to the top of the list.
   * This rule isn't currently supported by the public cipherstring API.
   */
  #define CIPHER_BUMP     6
  
  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, 0, 0, 0},
      /* "COMPLEMENTOFALL" */
      {0, SSL_TXT_CMPALL, 0, 0, 0, SSL_eNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  
      /*
       * "COMPLEMENTOFDEFAULT" (does *not* include ciphersuites not found in
       * ALL!)
       */
      {0, SSL_TXT_CMPDEF, 0, 0, 0, 0, 0, 0, 0, 0, 0, SSL_NOT_DEFAULT, 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. kDHE
       * combines DHE_DSS and DHE_RSA)
       */
      {0, SSL_TXT_kRSA, 0, SSL_kRSA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  
      {0, SSL_TXT_kEDH, 0, SSL_kDHE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kDHE, 0, SSL_kDHE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_DH, 0, SSL_kDHE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  
      {0, SSL_TXT_kEECDH, 0, SSL_kECDHE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kECDHE, 0, SSL_kECDHE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_ECDH, 0, SSL_kECDHE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  
      {0, SSL_TXT_kPSK, 0, SSL_kPSK, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kRSAPSK, 0, SSL_kRSAPSK, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kECDHEPSK, 0, SSL_kECDHEPSK, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kDHEPSK, 0, SSL_kDHEPSK, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kSRP, 0, SSL_kSRP, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_kGOST, 0, SSL_kGOST, 0, 0, 0, 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, 0, 0},
      {0, SSL_TXT_aDSS, 0, 0, SSL_aDSS, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_DSS, 0, 0, SSL_aDSS, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_aNULL, 0, 0, SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_aECDSA, 0, 0, SSL_aECDSA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_ECDSA, 0, 0, SSL_aECDSA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_aPSK, 0, 0, SSL_aPSK, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_aGOST01, 0, 0, SSL_aGOST01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_aGOST12, 0, 0, SSL_aGOST12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_aGOST, 0, 0, SSL_aGOST01 | SSL_aGOST12, 0, 0, 0, 0, 0, 0,
       0, 0, 0, 0},
      {0, SSL_TXT_aSRP, 0, 0, SSL_aSRP, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  
      /* aliases combining key exchange and server authentication */
      {0, SSL_TXT_EDH, 0, SSL_kDHE, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_DHE, 0, SSL_kDHE, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_EECDH, 0, SSL_kECDHE, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_ECDHE, 0, SSL_kECDHE, ~SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_NULL, 0, 0, 0, SSL_eNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_RSA, 0, SSL_kRSA, SSL_aRSA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_ADH, 0, SSL_kDHE, SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_AECDH, 0, SSL_kECDHE, SSL_aNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_PSK, 0, SSL_PSK, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_SRP, 0, SSL_kSRP, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
  
      /* symmetric encryption aliases */
      {0, SSL_TXT_3DES, 0, 0, 0, SSL_3DES, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_RC4, 0, 0, 0, SSL_RC4, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_RC2, 0, 0, 0, SSL_RC2, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_IDEA, 0, 0, 0, SSL_IDEA, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_SEED, 0, 0, 0, SSL_SEED, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_eNULL, 0, 0, 0, SSL_eNULL, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_GOST, 0, 0, 0, SSL_eGOST2814789CNT | SSL_eGOST2814789CNT12, 0,
       0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_AES128, 0, 0, 0, SSL_AES128 | SSL_AES128GCM | SSL_AES128CCM | SSL_AES128CCM8, 0,
       0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_AES256, 0, 0, 0, SSL_AES256 | SSL_AES256GCM | SSL_AES256CCM | SSL_AES256CCM8, 0,
       0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_AES, 0, 0, 0, SSL_AES, 0, 0, 0, 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, 0, 0},
      {0, SSL_TXT_AES_CCM, 0, 0, 0,
       SSL_AES128CCM | SSL_AES256CCM | SSL_AES128CCM8 | SSL_AES256CCM8, 0, 0, 0,
       0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_AES_CCM_8, 0, 0, 0, SSL_AES128CCM8 | SSL_AES256CCM8, 0, 0, 0, 0,
       0, 0},
      {0, SSL_TXT_CAMELLIA128, 0, 0, 0, SSL_CAMELLIA128, 0, 0, 0, 0, 0, 0, 0, 0,
       0},
      {0, SSL_TXT_CAMELLIA256, 0, 0, 0, SSL_CAMELLIA256, 0, 0, 0, 0, 0, 0, 0, 0,
       0},
      {0, SSL_TXT_CAMELLIA, 0, 0, 0, SSL_CAMELLIA, 0, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_CHACHA20, 0, 0, 0, SSL_CHACHA20, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  
      /* MAC aliases */
      {0, SSL_TXT_MD5, 0, 0, 0, 0, SSL_MD5, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_SHA1, 0, 0, 0, 0, SSL_SHA1, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_SHA, 0, 0, 0, 0, SSL_SHA1, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_GOST94, 0, 0, 0, 0, SSL_GOST94, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_GOST89MAC, 0, 0, 0, 0, SSL_GOST89MAC | SSL_GOST89MAC12, 0, 0,
       0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_SHA256, 0, 0, 0, 0, SSL_SHA256, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_SHA384, 0, 0, 0, 0, SSL_SHA384, 0, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_GOST12, 0, 0, 0, 0, SSL_GOST12_256, 0, 0, 0, 0, 0, 0, 0, 0},
  
      /* protocol version aliases */
      {0, SSL_TXT_SSLV3, 0, 0, 0, 0, 0, SSL3_VERSION, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_TLSV1, 0, 0, 0, 0, 0, TLS1_VERSION, 0, 0, 0, 0, 0, 0, 0},
      {0, "TLSv1.0", 0, 0, 0, 0, 0, TLS1_VERSION, 0, 0, 0, 0, 0, 0, 0},
      {0, SSL_TXT_TLSV1_2, 0, 0, 0, 0, 0, TLS1_2_VERSION, 0, 0, 0, 0, 0, 0, 0},
  
      /* strength classes */
      {0, SSL_TXT_LOW, 0, 0, 0, 0, 0, 0, 0, 0, 0, SSL_LOW, 0, 0, 0},
      {0, SSL_TXT_MEDIUM, 0, 0, 0, 0, 0, 0, 0, 0, 0, SSL_MEDIUM, 0, 0, 0},
      {0, SSL_TXT_HIGH, 0, 0, 0, 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, 0, 0, 0, SSL_FIPS, 0, 0, 0},
  
      /* "EDH-" aliases to "DHE-" labels (for backward compatibility) */
      {0, SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA, 0,
       SSL_kDHE, SSL_aDSS, SSL_3DES, SSL_SHA1, 0, 0, 0, 0,
       SSL_HIGH | SSL_FIPS, 0, 0, 0,},
      {0, SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA, 0,
       SSL_kDHE, SSL_aRSA, SSL_3DES, SSL_SHA1, 0, 0, 0, 0,
       SSL_HIGH | 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) > 0) {
          return pkey_id;
      }
      return 0;
  }
  
  #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) {
          if (EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL,
                                      ameth) <= 0)
              pkey_id = 0;
      }
      ENGINE_finish(tmpeng);
      return pkey_id;
  }
  
  #endif
  
  /* masks of disabled algorithms */
  static uint32_t disabled_enc_mask;
  static uint32_t disabled_mac_mask;
  static uint32_t disabled_mkey_mask;
  static uint32_t disabled_auth_mask;
  
  void ssl_load_ciphers(void)
  {
      size_t i;
      const ssl_cipher_table *t;
  
      disabled_enc_mask = 0;
      ssl_sort_cipher_list();
      for (i = 0, t = ssl_cipher_table_cipher; i < SSL_ENC_NUM_IDX; i++, t++) {
          if (t->nid == NID_undef) {
              ssl_cipher_methods[i] = NULL;
          } else {
              const EVP_CIPHER *cipher = EVP_get_cipherbynid(t->nid);
              ssl_cipher_methods[i] = cipher;
              if (cipher == NULL)
                  disabled_enc_mask |= t->mask;
          }
      }
  #ifdef SSL_FORBID_ENULL
      disabled_enc_mask |= SSL_eNULL;
  #endif
      disabled_mac_mask = 0;
      for (i = 0, t = ssl_cipher_table_mac; i < SSL_MD_NUM_IDX; i++, t++) {
          const EVP_MD *md = EVP_get_digestbynid(t->nid);
          ssl_digest_methods[i] = md;
          if (md == NULL) {
              disabled_mac_mask |= t->mask;
          } else {
              ssl_mac_secret_size[i] = EVP_MD_size(md);
              OPENSSL_assert(ssl_mac_secret_size[i] >= 0);
          }
      }
      /* Make sure we can access MD5 and SHA1 */
      OPENSSL_assert(ssl_digest_methods[SSL_MD_MD5_IDX] != NULL);
      OPENSSL_assert(ssl_digest_methods[SSL_MD_SHA1_IDX] != NULL);
  
      disabled_mkey_mask = 0;
      disabled_auth_mask = 0;
  
  #ifdef OPENSSL_NO_RSA
      disabled_mkey_mask |= SSL_kRSA | SSL_kRSAPSK;
      disabled_auth_mask |= SSL_aRSA;
  #endif
  #ifdef OPENSSL_NO_DSA
      disabled_auth_mask |= SSL_aDSS;
  #endif
  #ifdef OPENSSL_NO_DH
      disabled_mkey_mask |= SSL_kDHE | SSL_kDHEPSK;
  #endif
  #ifdef OPENSSL_NO_EC
      disabled_mkey_mask |= SSL_kECDHEPSK;
      disabled_auth_mask |= SSL_aECDSA;
  #endif
  #ifdef OPENSSL_NO_PSK
      disabled_mkey_mask |= SSL_PSK;
      disabled_auth_mask |= SSL_aPSK;
  #endif
  #ifdef OPENSSL_NO_SRP
      disabled_mkey_mask |= SSL_kSRP;
  #endif
  
      /*
       * Check for presence of GOST 34.10 algorithms, and if they are not
       * present, disable appropriate auth and key exchange
       */
      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;
      } else {
          disabled_mac_mask |= SSL_GOST89MAC;
      }
  
      ssl_mac_pkey_id[SSL_MD_GOST89MAC12_IDX] = get_optional_pkey_id("gost-mac-12");
      if (ssl_mac_pkey_id[SSL_MD_GOST89MAC12_IDX]) {
          ssl_mac_secret_size[SSL_MD_GOST89MAC12_IDX] = 32;
      } else {
          disabled_mac_mask |= SSL_GOST89MAC12;
      }
  
      if (!get_optional_pkey_id("gost2001"))
          disabled_auth_mask |= SSL_aGOST01 | SSL_aGOST12;
      if (!get_optional_pkey_id("gost2012_256"))
          disabled_auth_mask |= SSL_aGOST12;
      if (!get_optional_pkey_id("gost2012_512"))
          disabled_auth_mask |= SSL_aGOST12;
      /*
       * Disable GOST key exchange if no GOST signature algs are available *
       */
      if ((disabled_auth_mask & (SSL_aGOST01 | SSL_aGOST12)) == (SSL_aGOST01 | SSL_aGOST12))
          disabled_mkey_mask |= SSL_kGOST;
  }
  
  #ifndef OPENSSL_NO_COMP
  
  static int sk_comp_cmp(const SSL_COMP *const *a, const SSL_COMP *const *b)
  {
      return ((*a)->id - (*b)->id);
  }
  
  DEFINE_RUN_ONCE_STATIC(do_load_builtin_compressions)
  {
      SSL_COMP *comp = NULL;
      COMP_METHOD *method = COMP_zlib();
  
      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
      ssl_comp_methods = sk_SSL_COMP_new(sk_comp_cmp);
  
      if (COMP_get_type(method) != NID_undef && ssl_comp_methods != NULL) {
          comp = OPENSSL_malloc(sizeof(*comp));
          if (comp != NULL) {
              comp->method = method;
              comp->id = SSL_COMP_ZLIB_IDX;
              comp->name = COMP_get_name(method);
              sk_SSL_COMP_push(ssl_comp_methods, comp);
              sk_SSL_COMP_sort(ssl_comp_methods);
          }
      }
      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
      return 1;
  }
  
  static int load_builtin_compressions(void)
  {
      return RUN_ONCE(&ssl_load_builtin_comp_once, do_load_builtin_compressions);
  }
  #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 use_etm)
  {
      int i;
      const SSL_CIPHER *c;
  
      c = s->cipher;
      if (c == NULL)
          return (0);
      if (comp != NULL) {
          SSL_COMP ctmp;
  #ifndef OPENSSL_NO_COMP
          if (!load_builtin_compressions()) {
              /*
               * Currently don't care, since a failure only means that
               * ssl_comp_methods is NULL, which is perfectly OK
               */
          }
  #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 were only interested in comp then return success */
          if ((enc == NULL) && (md == NULL))
              return 1;
      }
  
      if ((enc == NULL) || (md == NULL))
          return 0;
  
      i = ssl_cipher_info_lookup(ssl_cipher_table_cipher, c->algorithm_enc);
  
      if (i == -1)
          *enc = NULL;
      else {
          if (i == SSL_ENC_NULL_IDX)
              *enc = EVP_enc_null();
          else
              *enc = ssl_cipher_methods[i];
      }
  
      i = ssl_cipher_info_lookup(ssl_cipher_table_mac, c->algorithm_mac);
      if (i == -1) {
          *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 (use_etm)
              return 1;
  
          if (s->ssl_version >> 8 != TLS1_VERSION_MAJOR ||
              s->ssl_version < TLS1_VERSION)
              return 1;
  
          if (FIPS_mode())
              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;
          else if (c->algorithm_enc == SSL_AES128 &&
                   c->algorithm_mac == SSL_SHA256 &&
                   (evp = EVP_get_cipherbyname("AES-128-CBC-HMAC-SHA256")))
              *enc = evp, *md = NULL;
          else if (c->algorithm_enc == SSL_AES256 &&
                   c->algorithm_mac == SSL_SHA256 &&
                   (evp = EVP_get_cipherbyname("AES-256-CBC-HMAC-SHA256")))
              *enc = evp, *md = NULL;
          return (1);
      } else
          return (0);
  }
  
  const EVP_MD *ssl_md(int idx)
  {
      idx &= SSL_HANDSHAKE_MAC_MASK;
      if (idx < 0 || idx >= SSL_MD_NUM_IDX)
          return NULL;
      return ssl_digest_methods[idx];
  }
  
  const EVP_MD *ssl_handshake_md(SSL *s)
  {
      return ssl_md(ssl_get_algorithm2(s));
  }
  
  const EVP_MD *ssl_prf_md(SSL *s)
  {
      return ssl_md(ssl_get_algorithm2(s) >> TLS1_PRF_DGST_SHIFT);
  }
  
  #define ITEM_SEP(a) \
          (((a) == ':') || ((a) == ' ') || ((a) == ';') || ((a) == ','))
  
  static void ll_append_tail(CIPHER_ORDER **head, CIPHER_ORDER *curr,
                             CIPHER_ORDER **tail)
  {
      if (curr == *tail)
          return;
      if (curr == *head)
          *head = curr->next;
      if (curr->prev != NULL)
          curr->prev->next = curr->next;
      if (curr->next != NULL)
          curr->next->prev = curr->prev;
      (*tail)->next = curr;
      curr->prev = *tail;
      curr->next = NULL;
      *tail = curr;
  }
  
  static void ll_append_head(CIPHER_ORDER **head, CIPHER_ORDER *curr,
                             CIPHER_ORDER **tail)
  {
      if (curr == *head)
          return;
      if (curr == *tail)
          *tail = curr->prev;
      if (curr->next != NULL)
          curr->next->prev = curr->prev;
      if (curr->prev != NULL)
          curr->prev->next = curr->next;
      (*head)->prev = curr;
      curr->next = *head;
      curr->prev = NULL;
      *head = curr;
  }
  
  static void ssl_cipher_collect_ciphers(const SSL_METHOD *ssl_method,
                                         int num_of_ciphers,
                                         uint32_t disabled_mkey,
                                         uint32_t disabled_auth,
                                         uint32_t disabled_enc,
                                         uint32_t disabled_mac,
                                         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)
              continue;
          if (FIPS_mode() && (c->algo_strength & SSL_FIPS))
              continue;
          if ((c->algorithm_mkey & disabled_mkey) ||
              (c->algorithm_auth & disabled_auth) ||
              (c->algorithm_enc & disabled_enc) ||
              (c->algorithm_mac & disabled_mac))
              continue;
          if (((ssl_method->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS) == 0) &&
              c->min_tls == 0)
              continue;
          if (((ssl_method->ssl3_enc->enc_flags & SSL_ENC_FLAG_DTLS) != 0) &&
              c->min_dtls == 0)
              continue;
  
          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,
                                         uint32_t disabled_mkey,
                                         uint32_t disabled_auth,
                                         uint32_t disabled_enc,
                                         uint32_t disabled_mac,
                                         CIPHER_ORDER *head)
  {
      CIPHER_ORDER *ciph_curr;
      const SSL_CIPHER **ca_curr;
      int i;
      uint32_t mask_mkey = ~disabled_mkey;
      uint32_t mask_auth = ~disabled_auth;
      uint32_t mask_enc = ~disabled_enc;
      uint32_t mask_mac = ~disabled_mac;
  
      /*
       * 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++) {
          uint32_t algorithm_mkey = cipher_aliases[i].algorithm_mkey;
          uint32_t algorithm_auth = cipher_aliases[i].algorithm_auth;
          uint32_t algorithm_enc = cipher_aliases[i].algorithm_enc;
          uint32_t algorithm_mac = cipher_aliases[i].algorithm_mac;
  
          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;
  
          *ca_curr = (SSL_CIPHER *)(cipher_aliases + i);
          ca_curr++;
      }
  
      *ca_curr = NULL;            /* end of list */
  }
  
  static void ssl_cipher_apply_rule(uint32_t cipher_id, uint32_t alg_mkey,
                                    uint32_t alg_auth, uint32_t alg_enc,
                                    uint32_t alg_mac, int min_tls,
                                    uint32_t algo_strength, int rule,
                                    int32_t 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 %08x/%08x/%08x/%08x/%08x %08x (%d)\n",
              rule, alg_mkey, alg_auth, alg_enc, alg_mac, min_tls,
              algo_strength, strength_bits);
  #endif
  
      if (rule == CIPHER_DEL || rule == CIPHER_BUMP)
          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 = %08x/%08x/%08x/%08x/%08x Algo_strength = %08x\n",
                      cp->name, cp->algorithm_mkey, cp->algorithm_auth,
                      cp->algorithm_enc, cp->algorithm_mac, cp->min_tls,
                      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 (min_tls && (min_tls != cp->min_tls))
                  continue;
              if ((algo_strength & SSL_STRONG_MASK)
                  && !(algo_strength & SSL_STRONG_MASK & cp->algo_strength))
                  continue;
              if ((algo_strength & SSL_DEFAULT_MASK)
                  && !(algo_strength & SSL_DEFAULT_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_BUMP) {
              if (curr->active)
                  ll_append_head(&head, curr, &tail);
          } 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)
  {
      int32_t max_strength_bits;
      int 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_zalloc(sizeof(int) * (max_strength_bits + 1));
      if (number_uses == NULL) {
          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);
  
      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, CERT *c)
  {
      uint32_t alg_mkey, alg_auth, alg_enc, alg_mac, algo_strength;
      int min_tls;
      const char *l, *buf;
      int j, multi, found, rule, retval, ok, buflen;
      uint32_t 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;
          min_tls = 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 == '.') || (ch == '='))
  #else
              while (isalnum(ch) || (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) == 0
                      && (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]->algo_strength & SSL_DEFAULT_MASK) {
                  if (algo_strength & SSL_DEFAULT_MASK) {
                      algo_strength &=
                          (ca_list[j]->algo_strength & SSL_DEFAULT_MASK) |
                          ~SSL_DEFAULT_MASK;
                      if (!(algo_strength & SSL_DEFAULT_MASK)) {
                          found = 0;
                          break;
                      }
                  } else
                      algo_strength |=
                          ca_list[j]->algo_strength & SSL_DEFAULT_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]->min_tls) {
                      if (min_tls != 0 && min_tls != ca_list[j]->min_tls) {
                          found = 0;
                          break;
                      } else {
                          min_tls = ca_list[j]->min_tls;
                      }
                  }
              }
  
              if (!multi)
                  break;
          }
  
          /*
           * Ok, we have the rule, now apply it
           */
          if (rule == CIPHER_SPECIAL) { /* special command */
              ok = 0;
              if ((buflen == 8) && strncmp(buf, "STRENGTH", 8) == 0)
                  ok = ssl_cipher_strength_sort(head_p, tail_p);
              else if (buflen == 10 && strncmp(buf, "SECLEVEL=", 9) == 0) {
                  int level = buf[9] - '0';
                  if (level < 0 || level > 5) {
                      SSLerr(SSL_F_SSL_CIPHER_PROCESS_RULESTR,
                             SSL_R_INVALID_COMMAND);
                  } else {
                      c->sec_level = level;
                      ok = 1;
                  }
              } 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,
                                    min_tls, algo_strength, rule, -1, head_p,
                                    tail_p);
          } else {
              while ((*l != '\0') && !ITEM_SEP(*l))
                  l++;
          }
          if (*l == '\0')
              break;              /* done */
      }
  
      return (retval);
  }
  
  #ifndef OPENSSL_NO_EC
  static int check_suiteb_cipher_list(const SSL_METHOD *meth, CERT *c,
                                      const char **prule_str)
  {
      unsigned int suiteb_flags = 0, suiteb_comb2 = 0;
      if (strncmp(*prule_str, "SUITEB128ONLY", 13) == 0) {
          suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS_ONLY;
      } else if (strncmp(*prule_str, "SUITEB128C2", 11) == 0) {
          suiteb_comb2 = 1;
          suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS;
      } else if (strncmp(*prule_str, "SUITEB128", 9) == 0) {
          suiteb_flags = SSL_CERT_FLAG_SUITEB_128_LOS;
      } else if (strncmp(*prule_str, "SUITEB192", 9) == 0) {
          suiteb_flags = SSL_CERT_FLAG_SUITEB_192_LOS;
      }
  
      if (suiteb_flags) {
          c->cert_flags &= ~SSL_CERT_FLAG_SUITEB_128_LOS;
          c->cert_flags |= suiteb_flags;
      } else
          suiteb_flags = c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS;
  
      if (!suiteb_flags)
          return 1;
      /* Check version: if TLS 1.2 ciphers allowed we can use Suite B */
  
      if (!(meth->ssl3_enc->enc_flags & SSL_ENC_FLAG_TLS1_2_CIPHERS)) {
          SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
                 SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE);
          return 0;
      }
  # ifndef OPENSSL_NO_EC
      switch (suiteb_flags) {
      case SSL_CERT_FLAG_SUITEB_128_LOS:
          if (suiteb_comb2)
              *prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
          else
              *prule_str =
                  "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384";
          break;
      case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
          *prule_str = "ECDHE-ECDSA-AES128-GCM-SHA256";
          break;
      case SSL_CERT_FLAG_SUITEB_192_LOS:
          *prule_str = "ECDHE-ECDSA-AES256-GCM-SHA384";
          break;
      }
      return 1;
  # else
      SSLerr(SSL_F_CHECK_SUITEB_CIPHER_LIST,
             SSL_R_ECDH_REQUIRED_FOR_SUITEB_MODE);
      return 0;
  # endif
  }
  #endif
  
  STACK_OF(SSL_CIPHER) *ssl_create_cipher_list(const SSL_METHOD *ssl_method, STACK_OF(SSL_CIPHER)
                                               **cipher_list, STACK_OF(SSL_CIPHER)
                                               **cipher_list_by_id,
                                               const char *rule_str, CERT *c)
  {
      int ok, num_of_ciphers, num_of_alias_max, num_of_group_aliases;
      uint32_t disabled_mkey, disabled_auth, disabled_enc, disabled_mac;
      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;
  #ifndef OPENSSL_NO_EC
      if (!check_suiteb_cipher_list(ssl_method, c, &rule_str))
          return NULL;
  #endif
  
      /*
       * To reduce the work to do we only want to process the compiled
       * in algorithms, so we first get the mask of disabled ciphers.
       */
  
      disabled_mkey = disabled_mkey_mask;
      disabled_auth = disabled_auth_mask;
      disabled_enc = disabled_enc_mask;
      disabled_mac = disabled_mac_mask;
  
      /*
       * 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 = OPENSSL_malloc(sizeof(*co_list) * 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, co_list, &head,
                                 &tail);
  
      /* Now arrange all ciphers by preference. */
  
      /*
       * Everything else being equal, prefer ephemeral ECDH over other key
       * exchange mechanisms.
       * For consistency, prefer ECDSA over RSA (though this only matters if the
       * server has both certificates, and is using the DEFAULT, or a client
       * preference).
       */
      ssl_cipher_apply_rule(0, SSL_kECDHE, SSL_aECDSA, 0, 0, 0, 0, CIPHER_ADD,
                            -1, &head, &tail);
      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);
  
  
      /* Within each strength group, we prefer GCM over CHACHA... */
      ssl_cipher_apply_rule(0, 0, 0, SSL_AESGCM, 0, 0, 0, CIPHER_ADD, -1,
                            &head, &tail);
      ssl_cipher_apply_rule(0, 0, 0, SSL_CHACHA20, 0, 0, 0, CIPHER_ADD, -1,
                            &head, &tail);
  
       /*
        * ...and generally, our preferred cipher is AES.
        * Note that AEADs will be bumped to take preference after sorting by
        * strength.
        */
      ssl_cipher_apply_rule(0, 0, 0, SSL_AES ^ SSL_AESGCM, 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);
  
      /*
       * 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);
  
      /* 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;
      }
  
      /*
       * Partially overrule strength sort to prefer TLS 1.2 ciphers/PRFs.
       * TODO(openssl-team): is there an easier way to accomplish all this?
       */
      ssl_cipher_apply_rule(0, 0, 0, 0, 0, TLS1_2_VERSION, 0, CIPHER_BUMP, -1,
                            &head, &tail);
  
      /*
       * Irrespective of strength, enforce the following order:
       * (EC)DHE + AEAD > (EC)DHE > rest of AEAD > rest.
       * Within each group, ciphers remain sorted by strength and previous
       * preference, i.e.,
       * 1) ECDHE > DHE
       * 2) GCM > CHACHA
       * 3) AES > rest
       * 4) TLS 1.2 > legacy
       *
       * Because we now bump ciphers to the top of the list, we proceed in
       * reverse order of preference.
       */
      ssl_cipher_apply_rule(0, 0, 0, 0, SSL_AEAD, 0, 0, CIPHER_BUMP, -1,
                            &head, &tail);
      ssl_cipher_apply_rule(0, SSL_kDHE | SSL_kECDHE, 0, 0, 0, 0, 0,
                            CIPHER_BUMP, -1,  &head, &tail);
      ssl_cipher_apply_rule(0, SSL_kDHE | SSL_kECDHE, 0, 0, SSL_AEAD, 0, 0,
                            CIPHER_BUMP, -1,  &head, &tail);
  
      /* 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 = OSSL_NELEM(cipher_aliases);
      num_of_alias_max = num_of_ciphers + num_of_group_aliases + 1;
      ca_list = OPENSSL_malloc(sizeof(*ca_list) * 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, 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, c);
          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, c);
  
      OPENSSL_free(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) {
          if (curr->active
              && (!FIPS_mode() || curr->cipher->algo_strength & SSL_FIPS)) {
              if (!sk_SSL_CIPHER_push(cipherstack, curr->cipher)) {
                  OPENSSL_free(co_list);
                  sk_SSL_CIPHER_free(cipherstack);
                  return NULL;
              }
  #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;
      }
      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)
  {
      const char *ver;
      const char *kx, *au, *enc, *mac;
      uint32_t alg_mkey, alg_auth, alg_enc, alg_mac;
      static const char *format =
          "%-23s %s Kx=%-8s Au=%-4s Enc=%-9s Mac=%-4s\n";
  
      if (buf == NULL) {
          len = 128;
          buf = OPENSSL_malloc(len);
          if (buf == NULL)
              return NULL;
      } else if (len < 128)
          return NULL;
  
      alg_mkey = cipher->algorithm_mkey;
      alg_auth = cipher->algorithm_auth;
      alg_enc = cipher->algorithm_enc;
      alg_mac = cipher->algorithm_mac;
  
      ver = ssl_protocol_to_string(cipher->min_tls);
  
      switch (alg_mkey) {
      case SSL_kRSA:
          kx = "RSA";
          break;
      case SSL_kDHE:
          kx = "DH";
          break;
      case SSL_kECDHE:
          kx = "ECDH";
          break;
      case SSL_kPSK:
          kx = "PSK";
          break;
      case SSL_kRSAPSK:
          kx = "RSAPSK";
          break;
      case SSL_kECDHEPSK:
          kx = "ECDHEPSK";
          break;
      case SSL_kDHEPSK:
          kx = "DHEPSK";
          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_aNULL:
          au = "None";
          break;
      case SSL_aECDSA:
          au = "ECDSA";
          break;
      case SSL_aPSK:
          au = "PSK";
          break;
      case SSL_aSRP:
          au = "SRP";
          break;
      case SSL_aGOST01:
          au = "GOST01";
          break;
          /* New GOST ciphersuites have both SSL_aGOST12 and SSL_aGOST01 bits */
      case (SSL_aGOST12 | SSL_aGOST01):
          au = "GOST12";
          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 = "RC4(128)";
          break;
      case SSL_RC2:
          enc = "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_AES128CCM:
          enc = "AESCCM(128)";
          break;
      case SSL_AES256CCM:
          enc = "AESCCM(256)";
          break;
      case SSL_AES128CCM8:
          enc = "AESCCM8(128)";
          break;
      case SSL_AES256CCM8:
          enc = "AESCCM8(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:
      case SSL_eGOST2814789CNT12:
          enc = "GOST89(256)";
          break;
      case SSL_CHACHA20POLY1305:
          enc = "CHACHA20/POLY1305(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:
      case SSL_GOST89MAC12:
          mac = "GOST89";
          break;
      case SSL_GOST94:
          mac = "GOST94";
          break;
      case SSL_GOST12_256:
      case SSL_GOST12_512:
          mac = "GOST2012";
          break;
      default:
          mac = "unknown";
          break;
      }
  
      BIO_snprintf(buf, len, format, cipher->name, ver, kx, au, enc, mac);
  
      return (buf);
  }
  
  const char *SSL_CIPHER_get_version(const SSL_CIPHER *c)
  {
      if (c == NULL)
          return "(NONE)";
  
      /*
       * Backwards-compatibility crutch.  In almost all contexts we report TLS
       * 1.0 as "TLSv1", but for ciphers we report "TLSv1.0".
       */
      if (c->min_tls == TLS1_VERSION)
          return "TLSv1.0";
      return ssl_protocol_to_string(c->min_tls);
  }
  
  /* 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 = (int) c->alg_bits;
          ret = (int) c->strength_bits;
      }
      return ret;
  }
  
  uint32_t 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
  STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
  {
      return NULL;
  }
  STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP)
                                                        *meths)
  {
      return meths;
  }
  int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
  {
      return 1;
  }
  
  #else
  STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void)
  {
      load_builtin_compressions();
      return (ssl_comp_methods);
  }
  
  STACK_OF(SSL_COMP) *SSL_COMP_set0_compression_methods(STACK_OF(SSL_COMP)
                                                        *meths)
  {
      STACK_OF(SSL_COMP) *old_meths = ssl_comp_methods;
      ssl_comp_methods = meths;
      return old_meths;
  }
  
  static void cmeth_free(SSL_COMP *cm)
  {
      OPENSSL_free(cm);
  }
  
  void ssl_comp_free_compression_methods_int(void)
  {
      STACK_OF(SSL_COMP) *old_meths = ssl_comp_methods;
      ssl_comp_methods = NULL;
      sk_SSL_COMP_pop_free(old_meths, cmeth_free);
  }
  
  int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
  {
      SSL_COMP *comp;
  
      if (cm == NULL || COMP_get_type(cm) == 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;
      }
  
      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
      comp = OPENSSL_malloc(sizeof(*comp));
      if (comp == NULL) {
          CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
          SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD, ERR_R_MALLOC_FAILURE);
          return (1);
      }
  
      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);
          CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
          SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,
                 SSL_R_DUPLICATE_COMPRESSION_ID);
          return (1);
      }
      if (ssl_comp_methods == NULL
          || !sk_SSL_COMP_push(ssl_comp_methods, comp)) {
          OPENSSL_free(comp);
          CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
          SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD, ERR_R_MALLOC_FAILURE);
          return (1);
      }
      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
      return (0);
  }
  #endif
  
  const char *SSL_COMP_get_name(const COMP_METHOD *comp)
  {
  #ifndef OPENSSL_NO_COMP
      return comp ? COMP_get_name(comp) : NULL;
  #else
      return NULL;
  #endif
  }
  
  /* For a cipher return the index corresponding to the certificate type */
  int ssl_cipher_get_cert_index(const SSL_CIPHER *c)
  {
      uint32_t alg_a;
  
      alg_a = c->algorithm_auth;
  
      if (alg_a & SSL_aECDSA)
          return SSL_PKEY_ECC;
      else if (alg_a & SSL_aDSS)
          return SSL_PKEY_DSA_SIGN;
      else if (alg_a & SSL_aRSA)
          return SSL_PKEY_RSA_ENC;
      else if (alg_a & SSL_aGOST12)
          return SSL_PKEY_GOST_EC;
      else if (alg_a & SSL_aGOST01)
          return SSL_PKEY_GOST01;
  
      return -1;
  }
  
  const SSL_CIPHER *ssl_get_cipher_by_char(SSL *ssl, const unsigned char *ptr)
  {
      const SSL_CIPHER *c = ssl->method->get_cipher_by_char(ptr);
  
      if (c == NULL || c->valid == 0)
          return NULL;
      return c;
  }
  
  const SSL_CIPHER *SSL_CIPHER_find(SSL *ssl, const unsigned char *ptr)
  {
      return ssl->method->get_cipher_by_char(ptr);
  }
  
  int SSL_CIPHER_get_cipher_nid(const SSL_CIPHER *c)
  {
      int i;
      if (c == NULL)
          return NID_undef;
      i = ssl_cipher_info_lookup(ssl_cipher_table_cipher, c->algorithm_enc);
      if (i == -1)
          return NID_undef;
      return ssl_cipher_table_cipher[i].nid;
  }
  
  int SSL_CIPHER_get_digest_nid(const SSL_CIPHER *c)
  {
      int i = ssl_cipher_info_lookup(ssl_cipher_table_mac, c->algorithm_mac);
  
      if (i == -1)
          return NID_undef;
      return ssl_cipher_table_mac[i].nid;
  }
  
  int SSL_CIPHER_get_kx_nid(const SSL_CIPHER *c)
  {
      int i = ssl_cipher_info_lookup(ssl_cipher_table_kx, c->algorithm_mkey);
  
      if (i == -1)
          return NID_undef;
      return ssl_cipher_table_kx[i].nid;
  }
  
  int SSL_CIPHER_get_auth_nid(const SSL_CIPHER *c)
  {
      int i = ssl_cipher_info_lookup(ssl_cipher_table_auth, c->algorithm_auth);
  
      if (i == -1)
          return NID_undef;
      return ssl_cipher_table_auth[i].nid;
  }
  
  int SSL_CIPHER_is_aead(const SSL_CIPHER *c)
  {
      return (c->algorithm_mac & SSL_AEAD) ? 1 : 0;
  }
  