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 };
 200
 201 static const struct {
 202   char name[15];
 203 } kKeyExchangeNames[18] = {
 204   {"NULL"},  // 0
 205   {"RSA"},  // 1
 206   {"RSA_EXPORT"},  // 2
 207   {"DH_DSS_EXPORT"},  // 3
 208   {"DH_DSS"},  // 4
 209   {"DH_RSA_EXPORT"},  // 5
 210   {"DH_RSA"},  // 6
 211   {"DHE_DSS_EXPORT"},  // 7
 212   {"DHE_DSS"},  // 8
 213   {"DHE_RSA_EXPORT"},  // 9
 214   {"DHE_RSA"},  // 10
 215   {"DH_anon_EXPORT"},  // 11
 216   {"DH_anon"},  // 12
 217   {"ECDH_ECDSA"},  // 13
 218   {"ECDHE_ECDSA"},  // 14
 219   {"ECDH_RSA"},  // 15
 220   {"ECDHE_RSA"},  // 16
 221   {"ECDH_anon"},  // 17
 222 };
 223
 224 static const struct {
 225   char name[18];
 226 } kCipherNames[18] = {
 227   {"NULL"},  // 0
 228   {"RC4_40"},  // 1
 229   {"RC4_128"},  // 2
 230   {"RC2_CBC_40"},  // 3
 231   {"IDEA_CBC"},  // 4
 232   {"DES40_CBC"},  // 5
 233   {"DES_CBC"},  // 6
 234   {"3DES_EDE_CBC"},  // 7
 235   {"AES_128_CBC"},  // 8
 236   {"AES_256_CBC"},  // 9
 237   {"CAMELLIA_128_CBC"},  // 10
 238   {"CAMELLIA_256_CBC"},  // 11
 239   {"SEED_CBC"},  // 12
 240   {"AES_128_GCM"},  // 13
 241   {"AES_256_GCM"},  // 14
 242   {"CAMELLIA_128_GCM"},  // 15
 243   {"CAMELLIA_256_GCM"},  // 16
 244   {"CHACHA20_POLY1305"},  // 17
 245 };
 246
 247 static const struct {
 248   char name[7];
 249 } kMacNames[5] = {
 250   {"NULL"},  // 0
 251   {"MD5"},  // 1
 252   {"SHA1"},  // 2
 253   {"SHA256"},  // 3
 254   {"SHA384"},  // 4
 255   // 7 is reserved to indicate an AEAD cipher suite.
 256 };
 257
 258 static const int kAEADMACValue = 7;
 259
 260 namespace net {
 261
 262 static int CipherSuiteCmp(const void* ia, const void* ib) {
 263   const CipherSuite* a = static_cast<const CipherSuite*>(ia);
 264   const CipherSuite* b = static_cast<const CipherSuite*>(ib);
 265
 266   if (a->cipher_suite < b->cipher_suite) {
 267     return -1;
 268   } else if (a->cipher_suite == b->cipher_suite) {
 269     return 0;
 270   } else {
 271     return 1;
 272   }
 273 }
 274
 275 void SSLCipherSuiteToStrings(const char** key_exchange_str,
 276                              const char** cipher_str,
 277                              const char** mac_str,
 278                              bool *is_aead,
 279                              uint16 cipher_suite) {
 280   *key_exchange_str = *cipher_str = *mac_str = "???";
 281   *is_aead = false;
 282
 283   struct CipherSuite desired = {0};
 284   desired.cipher_suite = cipher_suite;
 285
 286   void* r = bsearch(&desired, kCipherSuites,
 287                     arraysize(kCipherSuites), sizeof(kCipherSuites[0]),
 288                     CipherSuiteCmp);
 289
 290   if (!r)
 291     return;
 292
 293   const CipherSuite* cs = static_cast<CipherSuite*>(r);
 294
 295   const int key_exchange = cs->encoded >> 8;
 296   const int cipher = (cs->encoded >> 3) & 0x1f;
 297   const int mac = cs->encoded & 0x7;
 298
 299   *key_exchange_str = kKeyExchangeNames[key_exchange].name;
 300   *cipher_str = kCipherNames[cipher].name;
 301   if (mac == kAEADMACValue) {
 302     *is_aead = true;
 303     *mac_str = NULL;
 304   } else {
 305     *mac_str = kMacNames[mac].name;
 306   }
 307 }
 308
 309 void SSLVersionToString(const char** name, int ssl_version) {
 310   switch (ssl_version) {
 311     case SSL_CONNECTION_VERSION_SSL2:
 312       *name = "SSL 2.0";
 313       break;
 314     case SSL_CONNECTION_VERSION_SSL3:
 315       *name = "SSL 3.0";
 316       break;
 317     case SSL_CONNECTION_VERSION_TLS1:
 318       *name = "TLS 1.0";
 319       break;
 320     case SSL_CONNECTION_VERSION_TLS1_1:
 321       *name = "TLS 1.1";
 322       break;
 323     case SSL_CONNECTION_VERSION_TLS1_2:
 324       *name = "TLS 1.2";
 325       break;
 326     case SSL_CONNECTION_VERSION_QUIC:
 327       *name = "QUIC";
 328       break;
 329     default:
 330       NOTREACHED() << ssl_version;
 331       *name = "???";
 332       break;
 333   }
 334 }
 335
 336 bool ParseSSLCipherString(const std::string& cipher_string,
 337                           uint16* cipher_suite) {
 338   int value = 0;
 339   if (cipher_string.size() == 6 &&
 340       StartsWithASCII(cipher_string, "0x", false /* case insensitive */) &&
 341       base::HexStringToInt(cipher_string, &value)) {
 342     *cipher_suite = static_cast<uint16>(value);
 343     return true;
 344   }
 345   return false;
 346 }
 347
 348 bool IsSecureTLSCipherSuite(uint16 cipher_suite) {
 349   CipherSuite desired = {0};
 350   desired.cipher_suite = cipher_suite;
 351
 352   void* r = bsearch(&desired,
 353                     kCipherSuites,
 354                     arraysize(kCipherSuites),
 355                     sizeof(kCipherSuites[0]),
 356                     CipherSuiteCmp);
 357
 358   if (!r)
 359     return false;
 360
 361   const CipherSuite* cs = static_cast<const CipherSuite*>(r);
 362
 363   const int key_exchange = cs->encoded >> 8;
 364   const int cipher = (cs->encoded >> 3) & 0x1f;
 365   const int mac = cs->encoded & 0x7;
 366
 367   // Only allow forward secure key exchanges.
 368   switch (key_exchange) {
 369     case 10:  // DHE_RSA
 370     case 14:  // ECDHE_ECDSA
 371     case 16:  // ECDHE_RSA
 372       break;
 373     default:
 374       return false;
 375   }
 376
 377   switch (cipher) {
 378     case 13:  // AES_128_GCM
 379     case 14:  // AES_256_GCM
 380     case 17:  // CHACHA20_POLY1305
 381       break;
 382     default:
 383       return false;
 384   }
 385
 386   // Only AEADs allowed.
 387   if (mac != kAEADMACValue)
 388     return false;
 389
 390   return true;
 391 }
 392
 393 }  // namespace net