crypto/aes_128_gcm_helpers_nss_unittest.cc

   1 // Copyright 2015 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 "crypto/aes_128_gcm_helpers_nss.h"
   6
   7 #include <pk11pub.h>
   8 #include <secerr.h>
   9 #include <string>
  10
  11 #include "base/logging.h"
  12 #include "base/rand_util.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/string_util.h"
  15 #include "crypto/nss_util.h"
  16 #include "crypto/random.h"
  17 #include "crypto/scoped_nss_types.h"
  18 #include "testing/gtest/include/gtest/gtest.h"
  19
  20 namespace crypto {
  21
  22 namespace {
  23
  24 // The AES GCM test vectors come from the gcmDecrypt128.rsp and
  25 // gcmEncryptExtIV128.rsp files downloaded from
  26 // http://csrc.nist.gov/groups/STM/cavp/index.html on 2013-02-01. The test
  27 // vectors in that file look like this:
  28 //
  29 // [Keylen = 128]
  30 // [IVlen = 96]
  31 // [PTlen = 0]
  32 // [AADlen = 0]
  33 // [Taglen = 128]
  34 //
  35 // Count = 0
  36 // Key = cf063a34d4a9a76c2c86787d3f96db71
  37 // IV = 113b9785971864c83b01c787
  38 // CT =
  39 // AAD =
  40 // Tag = 72ac8493e3a5228b5d130a69d2510e42
  41 // PT =
  42 //
  43 // Count = 1
  44 // Key = a49a5e26a2f8cb63d05546c2a62f5343
  45 // IV = 907763b19b9b4ab6bd4f0281
  46 // CT =
  47 // AAD =
  48 // Tag = a2be08210d8c470a8df6e8fbd79ec5cf
  49 // FAIL
  50 //
  51 // ...
  52 //
  53 // These files are huge (2.6 MB and 2.8 MB), so this file contains just a
  54 // selection of test vectors.
  55
  56 // Describes a group of test vectors that all have a given key length, IV
  57 // length, plaintext length, AAD length, and tag length.
  58 struct TestGroupInfo {
  59   size_t key_len;
  60   size_t iv_len;
  61   size_t input_len;
  62   size_t aad_len;
  63   size_t tag_len;
  64 };
  65
  66 // Each test vector consists of six strings of lowercase hexadecimal digits.
  67 // The strings may be empty (zero length). A test vector with a NULL |key|
  68 // marks the end of an array of test vectors.
  69 struct TestVector {
  70   // Input:
  71   const char* key;
  72   const char* iv;
  73   const char* input;
  74   const char* aad;
  75   const char* tag;
  76
  77   // Expected output:
  78   const char* output;  // An empty string "" means decryption or encryption
  79                        // succeeded and the plaintext is zero-length. NULL means
  80                        // that the decryption or encryption failed.
  81 };
  82
  83 const TestGroupInfo test_group_info[] = {
  84     {128, 96, 0, 0, 128},
  85     {128, 96, 0, 128, 128},
  86     {128, 96, 128, 0, 128},
  87     {128, 96, 408, 160, 128},
  88     {128, 96, 408, 720, 128},
  89     {128, 96, 104, 0, 128},
  90 };
  91
  92 const TestVector decryption_test_group_0[] = {
  93     {"cf063a34d4a9a76c2c86787d3f96db71",
  94      "113b9785971864c83b01c787",
  95      "",
  96      "",
  97      "72ac8493e3a5228b5d130a69d2510e42",
  98      ""},
  99     {
 100      "a49a5e26a2f8cb63d05546c2a62f5343",
 101      "907763b19b9b4ab6bd4f0281",
 102      "",
 103      "",
 104      "a2be08210d8c470a8df6e8fbd79ec5cf",
 105      NULL  // FAIL
 106     },
 107     {NULL}};
 108
 109 const TestVector decryption_test_group_1[] = {
 110     {
 111      "d1f6af919cde85661208bdce0c27cb22",
 112      "898c6929b435017bf031c3c5",
 113      "",
 114      "7c5faa40e636bbc91107e68010c92b9f",
 115      "ae45f11777540a2caeb128be8092468a",
 116      NULL  // FAIL
 117     },
 118     {"2370e320d4344208e0ff5683f243b213",
 119      "04dbb82f044d30831c441228",
 120      "",
 121      "d43a8e5089eea0d026c03a85178b27da",
 122      "2a049c049d25aa95969b451d93c31c6e",
 123      ""},
 124     {NULL}};
 125
 126 const TestVector decryption_test_group_2[] = {
 127     {"e98b72a9881a84ca6b76e0f43e68647a",
 128      "8b23299fde174053f3d652ba",
 129      "5a3c1cf1985dbb8bed818036fdd5ab42",
 130      "",
 131      "23c7ab0f952b7091cd324835043b5eb5",
 132      "28286a321293253c3e0aa2704a278032"},
 133     {"33240636cd3236165f1a553b773e728e",
 134      "17c4d61493ecdc8f31700b12",
 135      "47bb7e23f7bdfe05a8091ac90e4f8b2e",
 136      "",
 137      "b723c70e931d9785f40fd4ab1d612dc9",
 138      "95695a5b12f2870b9cc5fdc8f218a97d"},
 139     {
 140      "5164df856f1e9cac04a79b808dc5be39",
 141      "e76925d5355e0584ce871b2b",
 142      "0216c899c88d6e32c958c7e553daa5bc",
 143      "",
 144      "a145319896329c96df291f64efbe0e3a",
 145      NULL  // FAIL
 146     },
 147     {NULL}};
 148
 149 const TestVector decryption_test_group_3[] = {
 150     {"af57f42c60c0fc5a09adb81ab86ca1c3",
 151      "a2dc01871f37025dc0fc9a79",
 152      "b9a535864f48ea7b6b1367914978f9bfa087d854bb0e269bed8d279d2eea1210e48947"
 153      "338b22f9bad09093276a331e9c79c7f4",
 154      "41dc38988945fcb44faf2ef72d0061289ef8efd8",
 155      "4f71e72bde0018f555c5adcce062e005",
 156      "3803a0727eeb0ade441e0ec107161ded2d425ec0d102f21f51bf2cf9947c7ec4aa7279"
 157      "5b2f69b041596e8817d0a3c16f8fadeb"},
 158     {"ebc753e5422b377d3cb64b58ffa41b61",
 159      "2e1821efaced9acf1f241c9b",
 160      "069567190554e9ab2b50a4e1fbf9c147340a5025fdbd201929834eaf6532325899ccb9"
 161      "f401823e04b05817243d2142a3589878",
 162      "b9673412fd4f88ba0e920f46dd6438ff791d8eef",
 163      "534d9234d2351cf30e565de47baece0b",
 164      "39077edb35e9c5a4b1e4c2a6b9bb1fce77f00f5023af40333d6d699014c2bcf4209c18"
 165      "353a18017f5b36bfc00b1f6dcb7ed485"},
 166     {
 167      "52bdbbf9cf477f187ec010589cb39d58",
 168      "d3be36d3393134951d324b31",
 169      "700188da144fa692cf46e4a8499510a53d90903c967f7f13e8a1bd8151a74adc4fe63e"
 170      "32b992760b3a5f99e9a47838867000a9",
 171      "93c4fc6a4135f54d640b0c976bf755a06a292c33",
 172      "8ca4e38aa3dfa6b1d0297021ccf3ea5f",
 173      NULL  // FAIL
 174     },
 175     {NULL}};
 176
 177 const TestVector decryption_test_group_4[] = {
 178     {"da2bb7d581493d692380c77105590201",
 179      "44aa3e7856ca279d2eb020c6",
 180      "9290d430c9e89c37f0446dbd620c9a6b34b1274aeb6f911f75867efcf95b6feda69f1a"
 181      "f4ee16c761b3c9aeac3da03aa9889c88",
 182      "4cd171b23bddb3a53cdf959d5c1710b481eb3785a90eb20a2345ee00d0bb7868c367ab"
 183      "12e6f4dd1dee72af4eee1d197777d1d6499cc541f34edbf45cda6ef90b3c024f9272d7"
 184      "2ec1909fb8fba7db88a4d6f7d3d925980f9f9f72",
 185      "9e3ac938d3eb0cadd6f5c9e35d22ba38",
 186      "9bbf4c1a2742f6ac80cb4e8a052e4a8f4f07c43602361355b717381edf9fabd4cb7e3a"
 187      "d65dbd1378b196ac270588dd0621f642"},
 188     {"d74e4958717a9d5c0e235b76a926cae8",
 189      "0b7471141e0c70b1995fd7b1",
 190      "e701c57d2330bf066f9ff8cf3ca4343cafe4894651cd199bdaaa681ba486b4a65c5a22"
 191      "b0f1420be29ea547d42c713bc6af66aa",
 192      "4a42b7aae8c245c6f1598a395316e4b8484dbd6e64648d5e302021b1d3fa0a38f46e22"
 193      "bd9c8080b863dc0016482538a8562a4bd0ba84edbe2697c76fd039527ac179ec5506cf"
 194      "34a6039312774cedebf4961f3978b14a26509f96",
 195      "e192c23cb036f0b31592989119eed55d",
 196      "840d9fb95e32559fb3602e48590280a172ca36d9b49ab69510f5bd552bfab7a306f85f"
 197      "f0a34bc305b88b804c60b90add594a17"},
 198     {
 199      "1986310c725ac94ecfe6422e75fc3ee7",
 200      "93ec4214fa8e6dc4e3afc775",
 201      "b178ec72f85a311ac4168f42a4b2c23113fbea4b85f4b9dabb74e143eb1b8b0a361e02"
 202      "43edfd365b90d5b325950df0ada058f9",
 203      "e80b88e62c49c958b5e0b8b54f532d9ff6aa84c8a40132e93e55b59fc24e8decf28463"
 204      "139f155d1e8ce4ee76aaeefcd245baa0fc519f83a5fb9ad9aa40c4b21126013f576c42"
 205      "72c2cb136c8fd091cc4539877a5d1e72d607f960",
 206      "8b347853f11d75e81e8a95010be81f17",
 207      NULL  // FAIL
 208     },
 209     {NULL}};
 210
 211 const TestVector decryption_test_group_5[] = {
 212     {"387218b246c1a8257748b56980e50c94",
 213      "dd7e014198672be39f95b69d",
 214      "cdba9e73eaf3d38eceb2b04a8d",
 215      "",
 216      "ecf90f4a47c9c626d6fb2c765d201556",
 217      "48f5b426baca03064554cc2b30"},
 218     {"294de463721e359863887c820524b3d4",
 219      "3338b35c9d57a5d28190e8c9",
 220      "2f46634e74b8e4c89812ac83b9",
 221      "",
 222      "dabd506764e68b82a7e720aa18da0abe",
 223      "46a2e55c8e264df211bd112685"},
 224     {"28ead7fd2179e0d12aa6d5d88c58c2dc",
 225      "5055347f18b4d5add0ae5c41",
 226      "142d8210c3fb84774cdbd0447a",
 227      "",
 228      "5fd321d9cdb01952dc85f034736c2a7d",
 229      "3b95b981086ee73cc4d0cc1422"},
 230     {
 231      "7d7b6c988137b8d470c57bf674a09c87",
 232      "9edf2aa970d016ac962e1fd8",
 233      "a85b66c3cb5eab91d5bdc8bc0e",
 234      "",
 235      "dc054efc01f3afd21d9c2484819f569a",
 236      NULL  // FAIL
 237     },
 238     {NULL}};
 239
 240 const TestVector encryption_test_group_0[] = {
 241     {"11754cd72aec309bf52f7687212e8957",
 242      "3c819d9a9bed087615030b65",
 243      "",
 244      "",
 245      "250327c674aaf477aef2675748cf6971",
 246      ""},
 247     {"ca47248ac0b6f8372a97ac43508308ed",
 248      "ffd2b598feabc9019262d2be",
 249      "",
 250      "",
 251      "60d20404af527d248d893ae495707d1a",
 252      ""},
 253     {NULL}};
 254
 255 const TestVector encryption_test_group_1[] = {
 256     {"77be63708971c4e240d1cb79e8d77feb",
 257      "e0e00f19fed7ba0136a797f3",
 258      "",
 259      "7a43ec1d9c0a5a78a0b16533a6213cab",
 260      "209fcc8d3675ed938e9c7166709dd946",
 261      ""},
 262     {"7680c5d3ca6154758e510f4d25b98820",
 263      "f8f105f9c3df4965780321f8",
 264      "",
 265      "c94c410194c765e3dcc7964379758ed3",
 266      "94dca8edfcf90bb74b153c8d48a17930",
 267      ""},
 268     {NULL}};
 269
 270 const TestVector encryption_test_group_2[] = {
 271     {"7fddb57453c241d03efbed3ac44e371c",
 272      "ee283a3fc75575e33efd4887",
 273      "d5de42b461646c255c87bd2962d3b9a2",
 274      "",
 275      "b36d1df9b9d5e596f83e8b7f52971cb3",
 276      "2ccda4a5415cb91e135c2a0f78c9b2fd"},
 277     {"ab72c77b97cb5fe9a382d9fe81ffdbed",
 278      "54cc7dc2c37ec006bcc6d1da",
 279      "007c5e5b3e59df24a7c355584fc1518d",
 280      "",
 281      "2b4401346697138c7a4891ee59867d0c",
 282      "0e1bde206a07a9c2c1b65300f8c64997"},
 283     {NULL}};
 284
 285 const TestVector encryption_test_group_3[] = {
 286     {"fe47fcce5fc32665d2ae399e4eec72ba",
 287      "5adb9609dbaeb58cbd6e7275",
 288      "7c0e88c88899a779228465074797cd4c2e1498d259b54390b85e3eef1c02df60e743f1"
 289      "b840382c4bccaf3bafb4ca8429bea063",
 290      "88319d6e1d3ffa5f987199166c8a9b56c2aeba5a",
 291      "291ef1982e4defedaa2249f898556b47",
 292      "98f4826f05a265e6dd2be82db241c0fbbbf9ffb1c173aa83964b7cf539304373636525"
 293      "3ddbc5db8778371495da76d269e5db3e"},
 294     {"ec0c2ba17aa95cd6afffe949da9cc3a8",
 295      "296bce5b50b7d66096d627ef",
 296      "b85b3753535b825cbe5f632c0b843c741351f18aa484281aebec2f45bb9eea2d79d987"
 297      "b764b9611f6c0f8641843d5d58f3a242",
 298      "f8d00f05d22bf68599bcdeb131292ad6e2df5d14",
 299      "890147971946b627c40016da1ecf3e77",
 300      "a7443d31c26bdf2a1c945e29ee4bd344a99cfaf3aa71f8b3f191f83c2adfc7a0716299"
 301      "5506fde6309ffc19e716eddf1a828c5a"},
 302     {NULL}};
 303
 304 const TestVector encryption_test_group_4[] = {
 305     {"2c1f21cf0f6fb3661943155c3e3d8492",
 306      "23cb5ff362e22426984d1907",
 307      "42f758836986954db44bf37c6ef5e4ac0adaf38f27252a1b82d02ea949c8a1a2dbc0d6"
 308      "8b5615ba7c1220ff6510e259f06655d8",
 309      "5d3624879d35e46849953e45a32a624d6a6c536ed9857c613b572b0333e701557a713e"
 310      "3f010ecdf9a6bd6c9e3e44b065208645aff4aabee611b391528514170084ccf587177f"
 311      "4488f33cfb5e979e42b6e1cfc0a60238982a7aec",
 312      "57a3ee28136e94c74838997ae9823f3a",
 313      "81824f0e0d523db30d3da369fdc0d60894c7a0a20646dd015073ad2732bd989b14a222"
 314      "b6ad57af43e1895df9dca2a5344a62cc"},
 315     {"d9f7d2411091f947b4d6f1e2d1f0fb2e",
 316      "e1934f5db57cc983e6b180e7",
 317      "73ed042327f70fe9c572a61545eda8b2a0c6e1d6c291ef19248e973aee6c312012f490"
 318      "c2c6f6166f4a59431e182663fcaea05a",
 319      "0a8a18a7150e940c3d87b38e73baee9a5c049ee21795663e264b694a949822b639092d"
 320      "0e67015e86363583fcf0ca645af9f43375f05fdb4ce84f411dcbca73c2220dea03a201"
 321      "15d2e51398344b16bee1ed7c499b353d6c597af8",
 322      "21b51ca862cb637cdd03b99a0f93b134",
 323      "aaadbd5c92e9151ce3db7210b8714126b73e43436d242677afa50384f2149b831f1d57"
 324      "3c7891c2a91fbc48db29967ec9542b23"},
 325     {NULL}};
 326
 327 const TestVector encryption_test_group_5[] = {
 328     {"fe9bb47deb3a61e423c2231841cfd1fb",
 329      "4d328eb776f500a2f7fb47aa",
 330      "f1cc3818e421876bb6b8bbd6c9",
 331      "",
 332      "43fd4727fe5cdb4b5b42818dea7ef8c9",
 333      "b88c5c1977b35b517b0aeae967"},
 334     {"6703df3701a7f54911ca72e24dca046a",
 335      "12823ab601c350ea4bc2488c",
 336      "793cd125b0b84a043e3ac67717",
 337      "",
 338      "38e6bcd29962e5f2c13626b85a877101",
 339      "b2051c80014f42f08735a7b0cd"},
 340     {NULL}};
 341
 342 const TestVector* const decryption_test_group_array[] = {
 343     decryption_test_group_0,
 344     decryption_test_group_1,
 345     decryption_test_group_2,
 346     decryption_test_group_3,
 347     decryption_test_group_4,
 348     decryption_test_group_5,
 349 };
 350
 351 const TestVector* const encryption_test_group_array[] = {
 352     encryption_test_group_0,
 353     encryption_test_group_1,
 354     encryption_test_group_2,
 355     encryption_test_group_3,
 356     encryption_test_group_4,
 357     encryption_test_group_5,
 358 };
 359
 360 bool DecodeHexString(const base::StringPiece& hex, std::string* bytes) {
 361   bytes->clear();
 362   if (hex.empty())
 363     return true;
 364   std::vector<uint8> v;
 365   if (!base::HexStringToBytes(hex.as_string(), &v))
 366     return false;
 367   if (!v.empty())
 368     bytes->assign(reinterpret_cast<const char*>(&v[0]), v.size());
 369   return true;
 370 }
 371
 372 class Aes128GcmHelpersTest : public ::testing::Test {
 373  public:
 374   enum Mode { DECRYPT, ENCRYPT };
 375
 376   void SetUp() override { EnsureNSSInit(); }
 377
 378   bool DecryptOrEncrypt(Mode mode,
 379                         const base::StringPiece& input,
 380                         const base::StringPiece& key,
 381                         const base::StringPiece& nonce,
 382                         const base::StringPiece& aad,
 383                         size_t auth_tag_size,
 384                         std::string* output) {
 385     DCHECK(output);
 386
 387     const CK_ATTRIBUTE_TYPE cka_mode =
 388         mode == DECRYPT ? CKA_DECRYPT : CKA_ENCRYPT;
 389
 390     SECItem key_item;
 391     key_item.type = siBuffer;
 392     key_item.data = const_cast<unsigned char*>(
 393         reinterpret_cast<const unsigned char*>(key.data()));
 394     key_item.len = key.size();
 395
 396     crypto::ScopedPK11Slot slot(PK11_GetInternalSlot());
 397     DCHECK(slot);
 398
 399     crypto::ScopedPK11SymKey aead_key(
 400         PK11_ImportSymKey(slot.get(), CKM_AES_GCM, PK11_OriginUnwrap, cka_mode,
 401                           &key_item, nullptr));
 402
 403     CK_GCM_PARAMS gcm_params;
 404     gcm_params.pIv = const_cast<unsigned char*>(
 405         reinterpret_cast<const unsigned char*>(nonce.data()));
 406     gcm_params.ulIvLen = nonce.size();
 407
 408     gcm_params.pAAD = const_cast<unsigned char*>(
 409         reinterpret_cast<const unsigned char*>(aad.data()));
 410
 411     gcm_params.ulAADLen = aad.size();
 412
 413     gcm_params.ulTagBits = auth_tag_size * 8;
 414
 415     SECItem param;
 416     param.type = siBuffer;
 417     param.data = reinterpret_cast<unsigned char*>(&gcm_params);
 418     param.len = sizeof(CK_GCM_PARAMS);
 419
 420     size_t maximum_output_length = input.size();
 421     if (mode == ENCRYPT)
 422       maximum_output_length += auth_tag_size;
 423
 424     unsigned int output_length = 0;
 425     unsigned char* raw_input = const_cast<unsigned char*>(
 426         reinterpret_cast<const unsigned char*>(input.data()));
 427     unsigned char* raw_output = reinterpret_cast<unsigned char*>(
 428         WriteInto(output, maximum_output_length + 1 /* null */));
 429
 430     PK11Helper_TransformFunction* transform_function =
 431         mode == DECRYPT ? PK11DecryptHelper : PK11EncryptHelper;
 432
 433     const SECStatus result = transform_function(
 434         aead_key.get(), CKM_AES_GCM, &param, raw_output, &output_length,
 435         maximum_output_length, raw_input, input.size());
 436
 437     if (result != SECSuccess)
 438       return false;
 439
 440     const size_t expected_output_length = mode == DECRYPT
 441                                               ? input.size() - auth_tag_size
 442                                               : input.size() + auth_tag_size;
 443
 444     EXPECT_EQ(expected_output_length, output_length);
 445
 446     output->resize(expected_output_length);
 447     return true;
 448   }
 449
 450  private:
 451   // The prototype of PK11_Decrypt and PK11_Encrypt.
 452   using PK11Helper_TransformFunction = SECStatus(PK11SymKey* symKey,
 453                                                  CK_MECHANISM_TYPE mechanism,
 454                                                  SECItem* param,
 455                                                  unsigned char* out,
 456                                                  unsigned int* outLen,
 457                                                  unsigned int maxLen,
 458                                                  const unsigned char* data,
 459                                                  unsigned int dataLen);
 460 };
 461
 462 }  // namespace
 463
 464 TEST_F(Aes128GcmHelpersTest, RoundTrip) {
 465   const std::string message = "Hello, world!";
 466
 467   const size_t kKeySize = 16;
 468   const size_t kNonceSize = 16;
 469
 470   std::string key, nonce;
 471   RandBytes(WriteInto(&key, kKeySize + 1), kKeySize);
 472   RandBytes(WriteInto(&nonce, kNonceSize + 1), kNonceSize);
 473
 474   // AEAD_AES_128_GCM is defined with a default authentication tag size of 16,
 475   // but RFC 5282 extends this to authentication tag sizes of 8 and 12 as well.
 476   size_t auth_tag_size = base::RandInt(2, 4) * 4;
 477
 478   std::string encrypted;
 479   ASSERT_TRUE(DecryptOrEncrypt(ENCRYPT, message, key, nonce,
 480                                base::StringPiece(), auth_tag_size, &encrypted));
 481
 482   std::string decrypted;
 483   ASSERT_TRUE(DecryptOrEncrypt(DECRYPT, encrypted, key, nonce,
 484                                base::StringPiece(), auth_tag_size, &decrypted));
 485
 486   EXPECT_EQ(message, decrypted);
 487 }
 488
 489 TEST_F(Aes128GcmHelpersTest, DecryptionVectors) {
 490   for (size_t i = 0; i < arraysize(decryption_test_group_array); i++) {
 491     SCOPED_TRACE(i);
 492     const TestVector* test_vectors = decryption_test_group_array[i];
 493     const TestGroupInfo& test_info = test_group_info[i];
 494
 495     for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
 496       // If not present then decryption is expected to fail.
 497       bool has_output = test_vectors[j].output;
 498
 499       // Decode the test vector.
 500       std::string key, iv, input, aad, tag, expected_output;
 501       ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
 502       ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
 503       ASSERT_TRUE(DecodeHexString(test_vectors[j].input, &input));
 504       ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
 505       ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
 506       if (has_output)
 507         ASSERT_TRUE(DecodeHexString(test_vectors[j].output, &expected_output));
 508
 509       // The test vector's lengths should look sane. Note that the lengths
 510       // in |test_info| are in bits.
 511       EXPECT_EQ(test_info.key_len, key.length() * 8);
 512       EXPECT_EQ(test_info.iv_len, iv.length() * 8);
 513       EXPECT_EQ(test_info.input_len, input.length() * 8);
 514       EXPECT_EQ(test_info.aad_len, aad.length() * 8);
 515       EXPECT_EQ(test_info.tag_len, tag.length() * 8);
 516       if (has_output)
 517         EXPECT_EQ(test_info.input_len, expected_output.length() * 8);
 518
 519       const std::string ciphertext = input + tag;
 520       std::string output;
 521
 522       if (!DecryptOrEncrypt(DECRYPT, ciphertext, key, iv, aad, tag.length(),
 523                             &output)) {
 524         EXPECT_FALSE(has_output);
 525         continue;
 526       }
 527
 528       EXPECT_TRUE(has_output);
 529       EXPECT_EQ(expected_output, output);
 530     }
 531   }
 532 }
 533
 534 TEST_F(Aes128GcmHelpersTest, EncryptionVectors) {
 535   for (size_t i = 0; i < arraysize(encryption_test_group_array); i++) {
 536     SCOPED_TRACE(i);
 537     const TestVector* test_vectors = encryption_test_group_array[i];
 538     const TestGroupInfo& test_info = test_group_info[i];
 539
 540     for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
 541       // If not present then decryption is expected to fail.
 542       bool has_output = test_vectors[j].output;
 543
 544       // Decode the test vector.
 545       std::string key, iv, input, aad, tag, expected_output;
 546       ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
 547       ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
 548       ASSERT_TRUE(DecodeHexString(test_vectors[j].input, &input));
 549       ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
 550       ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
 551       if (has_output)
 552         ASSERT_TRUE(DecodeHexString(test_vectors[j].output, &expected_output));
 553
 554       // The test vector's lengths should look sane. Note that the lengths
 555       // in |test_info| are in bits.
 556       EXPECT_EQ(test_info.key_len, key.length() * 8);
 557       EXPECT_EQ(test_info.iv_len, iv.length() * 8);
 558       EXPECT_EQ(test_info.input_len, input.length() * 8);
 559       EXPECT_EQ(test_info.aad_len, aad.length() * 8);
 560       EXPECT_EQ(test_info.tag_len, tag.length() * 8);
 561       if (has_output)
 562         EXPECT_EQ(test_info.input_len, expected_output.length() * 8);
 563
 564       std::string output;
 565
 566       if (!DecryptOrEncrypt(ENCRYPT, input, key, iv, aad, tag.length(),
 567                             &output)) {
 568         EXPECT_FALSE(has_output);
 569         continue;
 570       }
 571
 572       const std::string expected_output_with_tag = expected_output + tag;
 573
 574       EXPECT_TRUE(has_output);
 575       EXPECT_EQ(expected_output_with_tag, output);
 576     }
 577   }
 578 }
 579
 580 }  // namespace crypto