net/ssl/ssl_cipher_suite_names.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/ssl/ssl_cipher_suite_names.h"
   6
   7 #include <stdlib.h>
   8
   9 #include "base/logging.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/string_util.h"
  12 #include "net/ssl/ssl_connection_status_flags.h"
  13
  14 // Rather than storing the names of all the ciphersuites we eliminate the
  15 // redundancy and break each cipher suite into a key exchange method, cipher
  16 // and mac. For all the ciphersuites in the IANA registry, we extract each of
  17 // those components from the name, number them and pack the result into a
  18 // 16-bit number thus:
  19 //   (MSB to LSB)
  20 //   <3 bits> unused
  21 //   <5 bits> key exchange
  22 //   <5 bits> cipher
  23 //   <3 bits> mac
  24
  25 // The following tables were generated by ssl_cipher_suite_names_generate.go,
  26 // found in the same directory as this file.
  27
  28 struct CipherSuite {
  29   uint16 cipher_suite, encoded;
  30 };
  31
  32 static const struct CipherSuite kCipherSuites[] = {
  33     {0x0, 0x0},        // TLS_NULL_WITH_NULL_NULL
  34     {0x1, 0x101},      // TLS_RSA_WITH_NULL_MD5
  35     {0x2, 0x102},      // TLS_RSA_WITH_NULL_SHA
  36     {0x3, 0x209},      // TLS_RSA_EXPORT_WITH_RC4_40_MD5
  37     {0x4, 0x111},      // TLS_RSA_WITH_RC4_128_MD5
  38     {0x5, 0x112},      // TLS_RSA_WITH_RC4_128_SHA
  39     {0x6, 0x219},      // TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5
  40     {0x7, 0x122},      // TLS_RSA_WITH_IDEA_CBC_SHA
  41     {0x8, 0x22a},      // TLS_RSA_EXPORT_WITH_DES40_CBC_SHA
  42     {0x9, 0x132},      // TLS_RSA_WITH_DES_CBC_SHA
  43     {0xa, 0x13a},      // TLS_RSA_WITH_3DES_EDE_CBC_SHA
  44     {0xb, 0x32a},      // TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA
  45     {0xc, 0x432},      // TLS_DH_DSS_WITH_DES_CBC_SHA
  46     {0xd, 0x43a},      // TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA
  47     {0xe, 0x52a},      // TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA
  48     {0xf, 0x632},      // TLS_DH_RSA_WITH_DES_CBC_SHA
  49     {0x10, 0x63a},     // TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA
  50     {0x11, 0x72a},     // TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA
  51     {0x12, 0x832},     // TLS_DHE_DSS_WITH_DES_CBC_SHA
  52     {0x13, 0x83a},     // TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA
  53     {0x14, 0x92a},     // TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA
  54     {0x15, 0xa32},     // TLS_DHE_RSA_WITH_DES_CBC_SHA
  55     {0x16, 0xa3a},     // TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA
  56     {0x17, 0xb09},     // TLS_DH_anon_EXPORT_WITH_RC4_40_MD5
  57     {0x18, 0xc11},     // TLS_DH_anon_WITH_RC4_128_MD5
  58     {0x19, 0xb2a},     // TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA
  59     {0x1a, 0xc32},     // TLS_DH_anon_WITH_DES_CBC_SHA
  60     {0x1b, 0xc3a},     // TLS_DH_anon_WITH_3DES_EDE_CBC_SHA
  61     {0x2f, 0x142},     // TLS_RSA_WITH_AES_128_CBC_SHA
  62     {0x30, 0x442},     // TLS_DH_DSS_WITH_AES_128_CBC_SHA
  63     {0x31, 0x642},     // TLS_DH_RSA_WITH_AES_128_CBC_SHA
  64     {0x32, 0x842},     // TLS_DHE_DSS_WITH_AES_128_CBC_SHA
  65     {0x33, 0xa42},     // TLS_DHE_RSA_WITH_AES_128_CBC_SHA
  66     {0x34, 0xc42},     // TLS_DH_anon_WITH_AES_128_CBC_SHA
  67     {0x35, 0x14a},     // TLS_RSA_WITH_AES_256_CBC_SHA
  68     {0x36, 0x44a},     // TLS_DH_DSS_WITH_AES_256_CBC_SHA
  69     {0x37, 0x64a},     // TLS_DH_RSA_WITH_AES_256_CBC_SHA
  70     {0x38, 0x84a},     // TLS_DHE_DSS_WITH_AES_256_CBC_SHA
  71     {0x39, 0xa4a},     // TLS_DHE_RSA_WITH_AES_256_CBC_SHA
  72     {0x3a, 0xc4a},     // TLS_DH_anon_WITH_AES_256_CBC_SHA
  73     {0x3b, 0x103},     // TLS_RSA_WITH_NULL_SHA256
  74     {0x3c, 0x143},     // TLS_RSA_WITH_AES_128_CBC_SHA256
  75     {0x3d, 0x14b},     // TLS_RSA_WITH_AES_256_CBC_SHA256
  76     {0x3e, 0x443},     // TLS_DH_DSS_WITH_AES_128_CBC_SHA256
  77     {0x3f, 0x643},     // TLS_DH_RSA_WITH_AES_128_CBC_SHA256
  78     {0x40, 0x843},     // TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
  79     {0x41, 0x152},     // TLS_RSA_WITH_CAMELLIA_128_CBC_SHA
  80     {0x42, 0x452},     // TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA
  81     {0x43, 0x652},     // TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA
  82     {0x44, 0x852},     // TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA
  83     {0x45, 0xa52},     // TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA
  84     {0x46, 0xc52},     // TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA
  85     {0x67, 0xa43},     // TLS_DHE_RSA_WITH_AES_128_CBC_SHA256
  86     {0x68, 0x44b},     // TLS_DH_DSS_WITH_AES_256_CBC_SHA256
  87     {0x69, 0x64b},     // TLS_DH_RSA_WITH_AES_256_CBC_SHA256
  88     {0x6a, 0x84b},     // TLS_DHE_DSS_WITH_AES_256_CBC_SHA256
  89     {0x6b, 0xa4b},     // TLS_DHE_RSA_WITH_AES_256_CBC_SHA256
  90     {0x6c, 0xc43},     // TLS_DH_anon_WITH_AES_128_CBC_SHA256
  91     {0x6d, 0xc4b},     // TLS_DH_anon_WITH_AES_256_CBC_SHA256
  92     {0x84, 0x15a},     // TLS_RSA_WITH_CAMELLIA_256_CBC_SHA
  93     {0x85, 0x45a},     // TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA
  94     {0x86, 0x65a},     // TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA
  95     {0x87, 0x85a},     // TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA
  96     {0x88, 0xa5a},     // TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA
  97     {0x89, 0xc5a},     // TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA
  98     {0x96, 0x162},     // TLS_RSA_WITH_SEED_CBC_SHA
  99     {0x97, 0x462},     // TLS_DH_DSS_WITH_SEED_CBC_SHA
 100     {0x98, 0x662},     // TLS_DH_RSA_WITH_SEED_CBC_SHA
 101     {0x99, 0x862},     // TLS_DHE_DSS_WITH_SEED_CBC_SHA
 102     {0x9a, 0xa62},     // TLS_DHE_RSA_WITH_SEED_CBC_SHA
 103     {0x9b, 0xc62},     // TLS_DH_anon_WITH_SEED_CBC_SHA
 104     {0x9c, 0x16f},     // TLS_RSA_WITH_AES_128_GCM_SHA256
 105     {0x9d, 0x177},     // TLS_RSA_WITH_AES_256_GCM_SHA384
 106     {0x9e, 0xa6f},     // TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
 107     {0x9f, 0xa77},     // TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
 108     {0xa0, 0x66f},     // TLS_DH_RSA_WITH_AES_128_GCM_SHA256
 109     {0xa1, 0x677},     // TLS_DH_RSA_WITH_AES_256_GCM_SHA384
 110     {0xa2, 0x86f},     // TLS_DHE_DSS_WITH_AES_128_GCM_SHA256
 111     {0xa3, 0x877},     // TLS_DHE_DSS_WITH_AES_256_GCM_SHA384
 112     {0xa4, 0x46f},     // TLS_DH_DSS_WITH_AES_128_GCM_SHA256
 113     {0xa5, 0x477},     // TLS_DH_DSS_WITH_AES_256_GCM_SHA384
 114     {0xa6, 0xc6f},     // TLS_DH_anon_WITH_AES_128_GCM_SHA256
 115     {0xa7, 0xc77},     // TLS_DH_anon_WITH_AES_256_GCM_SHA384
 116     {0xba, 0x153},     // TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256
 117     {0xbb, 0x453},     // TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256
 118     {0xbc, 0x653},     // TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256
 119     {0xbd, 0x853},     // TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256
 120     {0xbe, 0xa53},     // TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256
 121     {0xbf, 0xc53},     // TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256
 122     {0xc0, 0x15b},     // TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256
 123     {0xc1, 0x45b},     // TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256
 124     {0xc2, 0x65b},     // TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256
 125     {0xc3, 0x85b},     // TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256
 126     {0xc4, 0xa5b},     // TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256
 127     {0xc5, 0xc5b},     // TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256
 128     {0xc001, 0xd02},   // TLS_ECDH_ECDSA_WITH_NULL_SHA
 129     {0xc002, 0xd12},   // TLS_ECDH_ECDSA_WITH_RC4_128_SHA
 130     {0xc003, 0xd3a},   // TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA
 131     {0xc004, 0xd42},   // TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA
 132     {0xc005, 0xd4a},   // TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA
 133     {0xc006, 0xe02},   // TLS_ECDHE_ECDSA_WITH_NULL_SHA
 134     {0xc007, 0xe12},   // TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
 135     {0xc008, 0xe3a},   // TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
 136     {0xc009, 0xe42},   // TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
 137     {0xc00a, 0xe4a},   // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
 138     {0xc00b, 0xf02},   // TLS_ECDH_RSA_WITH_NULL_SHA
 139     {0xc00c, 0xf12},   // TLS_ECDH_RSA_WITH_RC4_128_SHA
 140     {0xc00d, 0xf3a},   // TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA
 141     {0xc00e, 0xf42},   // TLS_ECDH_RSA_WITH_AES_128_CBC_SHA
 142     {0xc00f, 0xf4a},   // TLS_ECDH_RSA_WITH_AES_256_CBC_SHA
 143     {0xc010, 0x1002},  // TLS_ECDHE_RSA_WITH_NULL_SHA
 144     {0xc011, 0x1012},  // TLS_ECDHE_RSA_WITH_RC4_128_SHA
 145     {0xc012, 0x103a},  // TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
 146     {0xc013, 0x1042},  // TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
 147     {0xc014, 0x104a},  // TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
 148     {0xc015, 0x1102},  // TLS_ECDH_anon_WITH_NULL_SHA
 149     {0xc016, 0x1112},  // TLS_ECDH_anon_WITH_RC4_128_SHA
 150     {0xc017, 0x113a},  // TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA
 151     {0xc018, 0x1142},  // TLS_ECDH_anon_WITH_AES_128_CBC_SHA
 152     {0xc019, 0x114a},  // TLS_ECDH_anon_WITH_AES_256_CBC_SHA
 153     {0xc023, 0xe43},   // TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
 154     {0xc024, 0xe4c},   // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
 155     {0xc025, 0xd43},   // TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256
 156     {0xc026, 0xd4c},   // TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384
 157     {0xc027, 0x1043},  // TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
 158     {0xc028, 0x104c},  // TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
 159     {0xc029, 0xf43},   // TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256
 160     {0xc02a, 0xf4c},   // TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384
 161     {0xc02b, 0xe6f},   // TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
 162     {0xc02c, 0xe77},   // TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
 163     {0xc02d, 0xd6f},   // TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256
 164     {0xc02e, 0xd77},   // TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384
 165     {0xc02f, 0x106f},  // TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
 166     {0xc030, 0x1077},  // TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
 167     {0xc031, 0xf6f},   // TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256
 168     {0xc032, 0xf77},   // TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384
 169     {0xc072, 0xe53},   // TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256
 170     {0xc073, 0xe5c},   // TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384
 171     {0xc074, 0xd53},   // TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256
 172     {0xc075, 0xd5c},   // TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384
 173     {0xc076, 0x1053},  // TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256
 174     {0xc077, 0x105c},  // TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384
 175     {0xc078, 0xf53},   // TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256
 176     {0xc079, 0xf5c},   // TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384
 177     {0xc07a, 0x17f},   // TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256
 178     {0xc07b, 0x187},   // TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384
 179     {0xc07c, 0xa7f},   // TLS_DHE_RSA_WITH_CAMELLIA_128_GCM_SHA256
 180     {0xc07d, 0xa87},   // TLS_DHE_RSA_WITH_CAMELLIA_256_GCM_SHA384
 181     {0xc07e, 0x67f},   // TLS_DH_RSA_WITH_CAMELLIA_128_GCM_SHA256
 182     {0xc07f, 0x687},   // TLS_DH_RSA_WITH_CAMELLIA_256_GCM_SHA384
 183     {0xc080, 0x87f},   // TLS_DHE_DSS_WITH_CAMELLIA_128_GCM_SHA256
 184     {0xc081, 0x887},   // TLS_DHE_DSS_WITH_CAMELLIA_256_GCM_SHA384
 185     {0xc082, 0x47f},   // TLS_DH_DSS_WITH_CAMELLIA_128_GCM_SHA256
 186     {0xc083, 0x487},   // TLS_DH_DSS_WITH_CAMELLIA_256_GCM_SHA384
 187     {0xc084, 0xc7f},   // TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256
 188     {0xc085, 0xc87},   // TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384
 189     {0xc086, 0xe7f},   // TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_GCM_SHA256
 190     {0xc087, 0xe87},   // TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_GCM_SHA384
 191     {0xc088, 0xd7f},   // TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256
 192     {0xc089, 0xd87},   // TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384
 193     {0xc08a, 0x107f},  // TLS_ECDHE_RSA_WITH_CAMELLIA_128_GCM_SHA256
 194     {0xc08b, 0x1087},  // TLS_ECDHE_RSA_WITH_CAMELLIA_256_GCM_SHA384
 195     {0xc08c, 0xf7f},   // TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256
 196     {0xc08d, 0xf87},   // TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384
 197     {0xcc13, 0x108f},  // TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
 198     {0xcc14, 0x0e8f},  // TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
 199     {0xcc15, 0x0a8f},  // TLS_DHE_RSA_WITH_CHACHA20_POLY1305
 200 };
 201
 202 static const struct {
 203   char name[15];
 204 } kKeyExchangeNames[18] = {
 205   {"NULL"},  // 0
 206   {"RSA"},  // 1
 207   {"RSA_EXPORT"},  // 2
 208   {"DH_DSS_EXPORT"},  // 3
 209   {"DH_DSS"},  // 4
 210   {"DH_RSA_EXPORT"},  // 5
 211   {"DH_RSA"},  // 6
 212   {"DHE_DSS_EXPORT"},  // 7
 213   {"DHE_DSS"},  // 8
 214   {"DHE_RSA_EXPORT"},  // 9
 215   {"DHE_RSA"},  // 10
 216   {"DH_anon_EXPORT"},  // 11
 217   {"DH_anon"},  // 12
 218   {"ECDH_ECDSA"},  // 13
 219   {"ECDHE_ECDSA"},  // 14
 220   {"ECDH_RSA"},  // 15
 221   {"ECDHE_RSA"},  // 16
 222   {"ECDH_anon"},  // 17
 223 };
 224
 225 static const struct {
 226   char name[18];
 227 } kCipherNames[18] = {
 228   {"NULL"},  // 0
 229   {"RC4_40"},  // 1
 230   {"RC4_128"},  // 2
 231   {"RC2_CBC_40"},  // 3
 232   {"IDEA_CBC"},  // 4
 233   {"DES40_CBC"},  // 5
 234   {"DES_CBC"},  // 6
 235   {"3DES_EDE_CBC"},  // 7
 236   {"AES_128_CBC"},  // 8
 237   {"AES_256_CBC"},  // 9
 238   {"CAMELLIA_128_CBC"},  // 10
 239   {"CAMELLIA_256_CBC"},  // 11
 240   {"SEED_CBC"},  // 12
 241   {"AES_128_GCM"},  // 13
 242   {"AES_256_GCM"},  // 14
 243   {"CAMELLIA_128_GCM"},  // 15
 244   {"CAMELLIA_256_GCM"},  // 16
 245   {"CHACHA20_POLY1305"},  // 17
 246 };
 247
 248 static const struct {
 249   char name[7];
 250 } kMacNames[5] = {
 251   {"NULL"},  // 0
 252   {"MD5"},  // 1
 253   {"SHA1"},  // 2
 254   {"SHA256"},  // 3
 255   {"SHA384"},  // 4
 256   // 7 is reserved to indicate an AEAD cipher suite.
 257 };
 258
 259 static const int kAEADMACValue = 7;
 260
 261 namespace net {
 262
 263 static int CipherSuiteCmp(const void* ia, const void* ib) {
 264   const CipherSuite* a = static_cast<const CipherSuite*>(ia);
 265   const CipherSuite* b = static_cast<const CipherSuite*>(ib);
 266
 267   if (a->cipher_suite < b->cipher_suite) {
 268     return -1;
 269   } else if (a->cipher_suite == b->cipher_suite) {
 270     return 0;
 271   } else {
 272     return 1;
 273   }
 274 }
 275
 276 void SSLCipherSuiteToStrings(const char** key_exchange_str,
 277                              const char** cipher_str,
 278                              const char** mac_str,
 279                              bool *is_aead,
 280                              uint16 cipher_suite) {
 281   *key_exchange_str = *cipher_str = *mac_str = "???";
 282   *is_aead = false;
 283
 284   struct CipherSuite desired = {0};
 285   desired.cipher_suite = cipher_suite;
 286
 287   void* r = bsearch(&desired, kCipherSuites,
 288                     arraysize(kCipherSuites), sizeof(kCipherSuites[0]),
 289                     CipherSuiteCmp);
 290
 291   if (!r)
 292     return;
 293
 294   const CipherSuite* cs = static_cast<CipherSuite*>(r);
 295
 296   const int key_exchange = cs->encoded >> 8;
 297   const int cipher = (cs->encoded >> 3) & 0x1f;
 298   const int mac = cs->encoded & 0x7;
 299
 300   *key_exchange_str = kKeyExchangeNames[key_exchange].name;
 301   *cipher_str = kCipherNames[cipher].name;
 302   if (mac == kAEADMACValue) {
 303     *is_aead = true;
 304     *mac_str = NULL;
 305   } else {
 306     *mac_str = kMacNames[mac].name;
 307   }
 308 }
 309
 310 void SSLVersionToString(const char** name, int ssl_version) {
 311   switch (ssl_version) {
 312     case SSL_CONNECTION_VERSION_SSL2:
 313       *name = "SSL 2.0";
 314       break;
 315     case SSL_CONNECTION_VERSION_SSL3:
 316       *name = "SSL 3.0";
 317       break;
 318     case SSL_CONNECTION_VERSION_TLS1:
 319       *name = "TLS 1.0";
 320       break;
 321     case SSL_CONNECTION_VERSION_TLS1_1:
 322       *name = "TLS 1.1";
 323       break;
 324     case SSL_CONNECTION_VERSION_TLS1_2:
 325       *name = "TLS 1.2";
 326       break;
 327     case SSL_CONNECTION_VERSION_QUIC:
 328       *name = "QUIC";
 329       break;
 330     default:
 331       NOTREACHED() << ssl_version;
 332       *name = "???";
 333       break;
 334   }
 335 }
 336
 337 bool ParseSSLCipherString(const std::string& cipher_string,
 338                           uint16* cipher_suite) {
 339   int value = 0;
 340   if (cipher_string.size() == 6 &&
 341       StartsWithASCII(cipher_string, "0x", false /* case insensitive */) &&
 342       base::HexStringToInt(cipher_string, &value)) {
 343     *cipher_suite = static_cast<uint16>(value);
 344     return true;
 345   }
 346   return false;
 347 }
 348
 349 bool IsSecureTLSCipherSuite(uint16 cipher_suite) {
 350   CipherSuite desired = {0};
 351   desired.cipher_suite = cipher_suite;
 352
 353   void* r = bsearch(&desired,
 354                     kCipherSuites,
 355                     arraysize(kCipherSuites),
 356                     sizeof(kCipherSuites[0]),
 357                     CipherSuiteCmp);
 358
 359   if (!r)
 360     return false;
 361
 362   const CipherSuite* cs = static_cast<const CipherSuite*>(r);
 363
 364   const int key_exchange = cs->encoded >> 8;
 365   const int cipher = (cs->encoded >> 3) & 0x1f;
 366   const int mac = cs->encoded & 0x7;
 367
 368   // Only allow forward secure key exchanges.
 369   switch (key_exchange) {
 370     case 10:  // DHE_RSA
 371     case 14:  // ECDHE_ECDSA
 372     case 16:  // ECDHE_RSA
 373       break;
 374     default:
 375       return false;
 376   }
 377
 378   switch (cipher) {
 379     case 13:  // AES_128_GCM
 380     case 14:  // AES_256_GCM
 381     case 17:  // CHACHA20_POLY1305
 382       break;
 383     default:
 384       return false;
 385   }
 386
 387   // Only AEADs allowed.
 388   if (mac != kAEADMACValue)
 389     return false;
 390
 391   return true;
 392 }
 393
 394 }  // namespace net