media/cdm/aes_decryptor_unittest.cc

   1 // Copyright 2013 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 <string>
   6 #include <vector>
   7
   8 #include "base/basictypes.h"
   9 #include "base/bind.h"
  10 #include "base/json/json_reader.h"
  11 #include "base/values.h"
  12 #include "media/base/cdm_callback_promise.h"
  13 #include "media/base/cdm_key_information.h"
  14 #include "media/base/decoder_buffer.h"
  15 #include "media/base/decrypt_config.h"
  16 #include "media/base/mock_filters.h"
  17 #include "media/cdm/aes_decryptor.h"
  18 #include "testing/gmock/include/gmock/gmock.h"
  19 #include "testing/gtest/include/gtest/gtest.h"
  20
  21 using ::testing::_;
  22 using ::testing::Gt;
  23 using ::testing::IsNull;
  24 using ::testing::NotNull;
  25 using ::testing::SaveArg;
  26 using ::testing::StrNe;
  27 using ::testing::Unused;
  28
  29 MATCHER(IsEmpty, "") { return arg.empty(); }
  30 MATCHER(IsNotEmpty, "") { return !arg.empty(); }
  31 MATCHER(IsJSONDictionary, "") {
  32   std::string result(arg.begin(), arg.end());
  33   scoped_ptr<base::Value> root(base::JSONReader().ReadToValue(result));
  34   return (root.get() && root->GetType() == base::Value::TYPE_DICTIONARY);
  35 }
  36
  37 class GURL;
  38
  39 namespace media {
  40
  41 const uint8 kOriginalData[] = "Original subsample data.";
  42 const int kOriginalDataSize = 24;
  43
  44 // In the examples below, 'k'(key) has to be 16 bytes, and will always require
  45 // 2 bytes of padding. 'kid'(keyid) is variable length, and may require 0, 1,
  46 // or 2 bytes of padding.
  47
  48 const uint8 kKeyId[] = {
  49     // base64 equivalent is AAECAw
  50     0x00, 0x01, 0x02, 0x03
  51 };
  52
  53 // Key is 0x0405060708090a0b0c0d0e0f10111213,
  54 // base64 equivalent is BAUGBwgJCgsMDQ4PEBESEw.
  55 const char kKeyAsJWK[] =
  56     "{"
  57     "  \"keys\": ["
  58     "    {"
  59     "      \"kty\": \"oct\","
  60     "      \"alg\": \"A128KW\","
  61     "      \"kid\": \"AAECAw\","
  62     "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
  63     "    }"
  64     "  ],"
  65     "  \"type\": \"temporary\""
  66     "}";
  67
  68 // Same kid as kKeyAsJWK, key to decrypt kEncryptedData2
  69 const char kKeyAlternateAsJWK[] =
  70     "{"
  71     "  \"keys\": ["
  72     "    {"
  73     "      \"kty\": \"oct\","
  74     "      \"alg\": \"A128KW\","
  75     "      \"kid\": \"AAECAw\","
  76     "      \"k\": \"FBUWFxgZGhscHR4fICEiIw\""
  77     "    }"
  78     "  ]"
  79     "}";
  80
  81 const char kWrongKeyAsJWK[] =
  82     "{"
  83     "  \"keys\": ["
  84     "    {"
  85     "      \"kty\": \"oct\","
  86     "      \"alg\": \"A128KW\","
  87     "      \"kid\": \"AAECAw\","
  88     "      \"k\": \"7u7u7u7u7u7u7u7u7u7u7g\""
  89     "    }"
  90     "  ]"
  91     "}";
  92
  93 const char kWrongSizedKeyAsJWK[] =
  94     "{"
  95     "  \"keys\": ["
  96     "    {"
  97     "      \"kty\": \"oct\","
  98     "      \"alg\": \"A128KW\","
  99     "      \"kid\": \"AAECAw\","
 100     "      \"k\": \"AAECAw\""
 101     "    }"
 102     "  ]"
 103     "}";
 104
 105 const uint8 kIv[] = {
 106   0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
 107   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 108 };
 109
 110 // kOriginalData encrypted with kKey and kIv but without any subsamples (or
 111 // equivalently using kSubsampleEntriesCypherOnly).
 112 const uint8 kEncryptedData[] = {
 113   0x2f, 0x03, 0x09, 0xef, 0x71, 0xaf, 0x31, 0x16,
 114   0xfa, 0x9d, 0x18, 0x43, 0x1e, 0x96, 0x71, 0xb5,
 115   0xbf, 0xf5, 0x30, 0x53, 0x9a, 0x20, 0xdf, 0x95
 116 };
 117
 118 // kOriginalData encrypted with kSubsampleKey and kSubsampleIv using
 119 // kSubsampleEntriesNormal.
 120 const uint8 kSubsampleEncryptedData[] = {
 121   0x4f, 0x72, 0x09, 0x16, 0x09, 0xe6, 0x79, 0xad,
 122   0x70, 0x73, 0x75, 0x62, 0x09, 0xbb, 0x83, 0x1d,
 123   0x4d, 0x08, 0xd7, 0x78, 0xa4, 0xa7, 0xf1, 0x2e
 124 };
 125
 126 const uint8 kOriginalData2[] = "Changed Original data.";
 127
 128 const uint8 kIv2[] = {
 129   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 130   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 131 };
 132
 133 const uint8 kKeyId2[] = {
 134     // base64 equivalent is AAECAwQFBgcICQoLDA0ODxAREhM=
 135     0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
 136     0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
 137     0x10, 0x11, 0x12, 0x13
 138 };
 139
 140 const char kKey2AsJWK[] =
 141     "{"
 142     "  \"keys\": ["
 143     "    {"
 144     "      \"kty\": \"oct\","
 145     "      \"alg\": \"A128KW\","
 146     "      \"kid\": \"AAECAwQFBgcICQoLDA0ODxAREhM\","
 147     "      \"k\": \"FBUWFxgZGhscHR4fICEiIw\""
 148     "    }"
 149     "  ]"
 150     "}";
 151
 152 // 'k' in bytes is x14x15x16x17x18x19x1ax1bx1cx1dx1ex1fx20x21x22x23
 153
 154 const uint8 kEncryptedData2[] = {
 155   0x57, 0x66, 0xf4, 0x12, 0x1a, 0xed, 0xb5, 0x79,
 156   0x1c, 0x8e, 0x25, 0xd7, 0x17, 0xe7, 0x5e, 0x16,
 157   0xe3, 0x40, 0x08, 0x27, 0x11, 0xe9
 158 };
 159
 160 // Subsample entries for testing. The sum of |cypher_bytes| and |clear_bytes| of
 161 // all entries must be equal to kOriginalDataSize to make the subsample entries
 162 // valid.
 163
 164 const SubsampleEntry kSubsampleEntriesNormal[] = {
 165   { 2, 7 },
 166   { 3, 11 },
 167   { 1, 0 }
 168 };
 169
 170 const SubsampleEntry kSubsampleEntriesWrongSize[] = {
 171   { 3, 6 }, // This entry doesn't match the correct entry.
 172   { 3, 11 },
 173   { 1, 0 }
 174 };
 175
 176 const SubsampleEntry kSubsampleEntriesInvalidTotalSize[] = {
 177   { 1, 1000 }, // This entry is too large.
 178   { 3, 11 },
 179   { 1, 0 }
 180 };
 181
 182 const SubsampleEntry kSubsampleEntriesClearOnly[] = {
 183   { 7, 0 },
 184   { 8, 0 },
 185   { 9, 0 }
 186 };
 187
 188 const SubsampleEntry kSubsampleEntriesCypherOnly[] = {
 189   { 0, 6 },
 190   { 0, 8 },
 191   { 0, 10 }
 192 };
 193
 194 static scoped_refptr<DecoderBuffer> CreateEncryptedBuffer(
 195     const std::vector<uint8>& data,
 196     const std::vector<uint8>& key_id,
 197     const std::vector<uint8>& iv,
 198     const std::vector<SubsampleEntry>& subsample_entries) {
 199   DCHECK(!data.empty());
 200   scoped_refptr<DecoderBuffer> encrypted_buffer(new DecoderBuffer(data.size()));
 201   memcpy(encrypted_buffer->writable_data(), &data[0], data.size());
 202   CHECK(encrypted_buffer.get());
 203   std::string key_id_string(
 204       reinterpret_cast<const char*>(key_id.empty() ? NULL : &key_id[0]),
 205       key_id.size());
 206   std::string iv_string(
 207       reinterpret_cast<const char*>(iv.empty() ? NULL : &iv[0]), iv.size());
 208   encrypted_buffer->set_decrypt_config(scoped_ptr<DecryptConfig>(
 209       new DecryptConfig(key_id_string, iv_string, subsample_entries)));
 210   return encrypted_buffer;
 211 }
 212
 213 enum PromiseResult { RESOLVED, REJECTED };
 214
 215 class AesDecryptorTest : public testing::Test {
 216  public:
 217   AesDecryptorTest()
 218       : decryptor_(base::Bind(&AesDecryptorTest::OnSessionMessage,
 219                               base::Unretained(this)),
 220                    base::Bind(&AesDecryptorTest::OnSessionClosed,
 221                               base::Unretained(this)),
 222                    base::Bind(&AesDecryptorTest::OnSessionKeysChange,
 223                               base::Unretained(this))),
 224         decrypt_cb_(base::Bind(&AesDecryptorTest::BufferDecrypted,
 225                                base::Unretained(this))),
 226         original_data_(kOriginalData, kOriginalData + kOriginalDataSize),
 227         encrypted_data_(kEncryptedData,
 228                         kEncryptedData + arraysize(kEncryptedData)),
 229         subsample_encrypted_data_(
 230             kSubsampleEncryptedData,
 231             kSubsampleEncryptedData + arraysize(kSubsampleEncryptedData)),
 232         key_id_(kKeyId, kKeyId + arraysize(kKeyId)),
 233         iv_(kIv, kIv + arraysize(kIv)),
 234         normal_subsample_entries_(
 235             kSubsampleEntriesNormal,
 236             kSubsampleEntriesNormal + arraysize(kSubsampleEntriesNormal)) {
 237   }
 238
 239  protected:
 240   void OnResolveWithSession(PromiseResult expected_result,
 241                             const std::string& session_id) {
 242     EXPECT_EQ(expected_result, RESOLVED) << "Unexpectedly resolved.";
 243     EXPECT_GT(session_id.length(), 0ul);
 244     session_id_ = session_id;
 245   }
 246
 247   void OnResolve(PromiseResult expected_result) {
 248     EXPECT_EQ(expected_result, RESOLVED) << "Unexpectedly resolved.";
 249   }
 250
 251   void OnReject(PromiseResult expected_result,
 252                 MediaKeys::Exception exception_code,
 253                 uint32 system_code,
 254                 const std::string& error_message) {
 255     EXPECT_EQ(expected_result, REJECTED) << "Unexpectedly rejected.";
 256   }
 257
 258   scoped_ptr<SimpleCdmPromise> CreatePromise(PromiseResult expected_result) {
 259     scoped_ptr<SimpleCdmPromise> promise(
 260         new CdmCallbackPromise<>(base::Bind(&AesDecryptorTest::OnResolve,
 261                                             base::Unretained(this),
 262                                             expected_result),
 263                                  base::Bind(&AesDecryptorTest::OnReject,
 264                                             base::Unretained(this),
 265                                             expected_result)));
 266     return promise.Pass();
 267   }
 268
 269   scoped_ptr<NewSessionCdmPromise> CreateSessionPromise(
 270       PromiseResult expected_result) {
 271     scoped_ptr<NewSessionCdmPromise> promise(
 272         new CdmCallbackPromise<std::string>(
 273             base::Bind(&AesDecryptorTest::OnResolveWithSession,
 274                        base::Unretained(this),
 275                        expected_result),
 276             base::Bind(&AesDecryptorTest::OnReject,
 277                        base::Unretained(this),
 278                        expected_result)));
 279     return promise.Pass();
 280   }
 281
 282   // Creates a new session using |key_id|. Returns the session ID.
 283   std::string CreateSession(const std::vector<uint8>& key_id) {
 284     DCHECK(!key_id.empty());
 285     EXPECT_CALL(*this, OnSessionMessage(IsNotEmpty(), _, IsJSONDictionary(),
 286                                         GURL::EmptyGURL()));
 287     decryptor_.CreateSessionAndGenerateRequest(
 288         MediaKeys::TEMPORARY_SESSION, "webm", &key_id[0], key_id.size(),
 289         CreateSessionPromise(RESOLVED));
 290     // This expects the promise to be called synchronously, which is the case
 291     // for AesDecryptor.
 292     return session_id_;
 293   }
 294
 295   // Closes the session specified by |session_id|.
 296   void CloseSession(const std::string& session_id) {
 297     EXPECT_CALL(*this, OnSessionClosed(session_id));
 298     decryptor_.CloseSession(session_id, CreatePromise(RESOLVED));
 299   }
 300
 301   // Removes the session specified by |session_id|. This should simply do a
 302   // CloseSession().
 303   // TODO(jrummell): Clean this up when the prefixed API is removed.
 304   // http://crbug.com/249976.
 305   void RemoveSession(const std::string& session_id) {
 306     EXPECT_CALL(*this, OnSessionClosed(session_id));
 307     decryptor_.RemoveSession(session_id, CreatePromise(RESOLVED));
 308   }
 309
 310   MOCK_METHOD2(OnSessionKeysChangeCalled,
 311                void(const std::string& session_id,
 312                     bool has_additional_usable_key));
 313
 314   void OnSessionKeysChange(const std::string& session_id,
 315                            bool has_additional_usable_key,
 316                            CdmKeysInfo keys_info) {
 317     keys_info_.swap(keys_info);
 318     OnSessionKeysChangeCalled(session_id, has_additional_usable_key);
 319   }
 320
 321   // Updates the session specified by |session_id| with |key|. |result|
 322   // tests that the update succeeds or generates an error.
 323   void UpdateSessionAndExpect(std::string session_id,
 324                               const std::string& key,
 325                               PromiseResult expected_result) {
 326     DCHECK(!key.empty());
 327
 328     if (expected_result == RESOLVED) {
 329       EXPECT_CALL(*this, OnSessionKeysChangeCalled(session_id, true));
 330     } else {
 331       EXPECT_CALL(*this, OnSessionKeysChangeCalled(_, _)).Times(0);
 332     }
 333
 334     decryptor_.UpdateSession(session_id,
 335                              reinterpret_cast<const uint8*>(key.c_str()),
 336                              key.length(),
 337                              CreatePromise(expected_result));
 338   }
 339
 340   bool KeysInfoContains(std::vector<uint8> expected) {
 341     for (const auto& key_id : keys_info_) {
 342       if (key_id->key_id == expected)
 343         return true;
 344     }
 345     return false;
 346   }
 347
 348   MOCK_METHOD2(BufferDecrypted, void(Decryptor::Status,
 349                                      const scoped_refptr<DecoderBuffer>&));
 350
 351   enum DecryptExpectation {
 352     SUCCESS,
 353     DATA_MISMATCH,
 354     DATA_AND_SIZE_MISMATCH,
 355     DECRYPT_ERROR,
 356     NO_KEY
 357   };
 358
 359   void DecryptAndExpect(const scoped_refptr<DecoderBuffer>& encrypted,
 360                         const std::vector<uint8>& plain_text,
 361                         DecryptExpectation result) {
 362     scoped_refptr<DecoderBuffer> decrypted;
 363
 364     switch (result) {
 365       case SUCCESS:
 366       case DATA_MISMATCH:
 367       case DATA_AND_SIZE_MISMATCH:
 368         EXPECT_CALL(*this, BufferDecrypted(Decryptor::kSuccess, NotNull()))
 369             .WillOnce(SaveArg<1>(&decrypted));
 370         break;
 371       case DECRYPT_ERROR:
 372         EXPECT_CALL(*this, BufferDecrypted(Decryptor::kError, IsNull()))
 373             .WillOnce(SaveArg<1>(&decrypted));
 374         break;
 375       case NO_KEY:
 376         EXPECT_CALL(*this, BufferDecrypted(Decryptor::kNoKey, IsNull()))
 377             .WillOnce(SaveArg<1>(&decrypted));
 378         break;
 379     }
 380
 381     decryptor_.Decrypt(Decryptor::kVideo, encrypted, decrypt_cb_);
 382
 383     std::vector<uint8> decrypted_text;
 384     if (decrypted.get() && decrypted->data_size()) {
 385       decrypted_text.assign(
 386         decrypted->data(), decrypted->data() + decrypted->data_size());
 387     }
 388
 389     switch (result) {
 390       case SUCCESS:
 391         EXPECT_EQ(plain_text, decrypted_text);
 392         break;
 393       case DATA_MISMATCH:
 394         EXPECT_EQ(plain_text.size(), decrypted_text.size());
 395         EXPECT_NE(plain_text, decrypted_text);
 396         break;
 397       case DATA_AND_SIZE_MISMATCH:
 398         EXPECT_NE(plain_text.size(), decrypted_text.size());
 399         break;
 400       case DECRYPT_ERROR:
 401       case NO_KEY:
 402         EXPECT_TRUE(decrypted_text.empty());
 403         break;
 404     }
 405   }
 406
 407   MOCK_METHOD4(OnSessionMessage,
 408                void(const std::string& session_id,
 409                     MediaKeys::MessageType message_type,
 410                     const std::vector<uint8>& message,
 411                     const GURL& legacy_destination_url));
 412   MOCK_METHOD1(OnSessionClosed, void(const std::string& session_id));
 413
 414   AesDecryptor decryptor_;
 415   AesDecryptor::DecryptCB decrypt_cb_;
 416   std::string session_id_;
 417   CdmKeysInfo keys_info_;
 418
 419   // Constants for testing.
 420   const std::vector<uint8> original_data_;
 421   const std::vector<uint8> encrypted_data_;
 422   const std::vector<uint8> subsample_encrypted_data_;
 423   const std::vector<uint8> key_id_;
 424   const std::vector<uint8> iv_;
 425   const std::vector<SubsampleEntry> normal_subsample_entries_;
 426   const std::vector<SubsampleEntry> no_subsample_entries_;
 427 };
 428
 429 TEST_F(AesDecryptorTest, CreateSessionWithNullInitData) {
 430   EXPECT_CALL(*this,
 431               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 432   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 433                                              "webm", NULL, 0,
 434                                              CreateSessionPromise(RESOLVED));
 435 }
 436
 437 TEST_F(AesDecryptorTest, MultipleCreateSession) {
 438   EXPECT_CALL(*this,
 439               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 440   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 441                                              "webm", NULL, 0,
 442                                              CreateSessionPromise(RESOLVED));
 443
 444   EXPECT_CALL(*this,
 445               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 446   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 447                                              "webm", NULL, 0,
 448                                              CreateSessionPromise(RESOLVED));
 449
 450   EXPECT_CALL(*this,
 451               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 452   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 453                                              "webm", NULL, 0,
 454                                              CreateSessionPromise(RESOLVED));
 455 }
 456
 457 TEST_F(AesDecryptorTest, NormalDecryption) {
 458   std::string session_id = CreateSession(key_id_);
 459   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 460   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 461       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 462   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 463 }
 464
 465 TEST_F(AesDecryptorTest, UnencryptedFrame) {
 466   // An empty iv string signals that the frame is unencrypted.
 467   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 468       original_data_, key_id_, std::vector<uint8>(), no_subsample_entries_);
 469   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 470 }
 471
 472 TEST_F(AesDecryptorTest, WrongKey) {
 473   std::string session_id = CreateSession(key_id_);
 474   UpdateSessionAndExpect(session_id, kWrongKeyAsJWK, RESOLVED);
 475   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 476       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 477   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 478 }
 479
 480 TEST_F(AesDecryptorTest, NoKey) {
 481   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 482       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 483   EXPECT_CALL(*this, BufferDecrypted(AesDecryptor::kNoKey, IsNull()));
 484   decryptor_.Decrypt(Decryptor::kVideo, encrypted_buffer, decrypt_cb_);
 485 }
 486
 487 TEST_F(AesDecryptorTest, KeyReplacement) {
 488   std::string session_id = CreateSession(key_id_);
 489   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 490       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 491
 492   UpdateSessionAndExpect(session_id, kWrongKeyAsJWK, RESOLVED);
 493   ASSERT_NO_FATAL_FAILURE(DecryptAndExpect(
 494       encrypted_buffer, original_data_, DATA_MISMATCH));
 495
 496   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 497   ASSERT_NO_FATAL_FAILURE(
 498       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 499 }
 500
 501 TEST_F(AesDecryptorTest, WrongSizedKey) {
 502   std::string session_id = CreateSession(key_id_);
 503   UpdateSessionAndExpect(session_id, kWrongSizedKeyAsJWK, REJECTED);
 504 }
 505
 506 TEST_F(AesDecryptorTest, MultipleKeysAndFrames) {
 507   std::string session_id = CreateSession(key_id_);
 508   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 509   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 510       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 511   ASSERT_NO_FATAL_FAILURE(
 512       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 513
 514   UpdateSessionAndExpect(session_id, kKey2AsJWK, RESOLVED);
 515
 516   // The first key is still available after we added a second key.
 517   ASSERT_NO_FATAL_FAILURE(
 518       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 519
 520   // The second key is also available.
 521   encrypted_buffer = CreateEncryptedBuffer(
 522       std::vector<uint8>(kEncryptedData2,
 523                          kEncryptedData2 + arraysize(kEncryptedData2)),
 524       std::vector<uint8>(kKeyId2, kKeyId2 + arraysize(kKeyId2)),
 525       std::vector<uint8>(kIv2, kIv2 + arraysize(kIv2)),
 526       no_subsample_entries_);
 527   ASSERT_NO_FATAL_FAILURE(DecryptAndExpect(
 528       encrypted_buffer,
 529       std::vector<uint8>(kOriginalData2,
 530                          kOriginalData2 + arraysize(kOriginalData2) - 1),
 531       SUCCESS));
 532 }
 533
 534 TEST_F(AesDecryptorTest, CorruptedIv) {
 535   std::string session_id = CreateSession(key_id_);
 536   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 537
 538   std::vector<uint8> bad_iv = iv_;
 539   bad_iv[1]++;
 540
 541   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 542       encrypted_data_, key_id_, bad_iv, no_subsample_entries_);
 543
 544   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 545 }
 546
 547 TEST_F(AesDecryptorTest, CorruptedData) {
 548   std::string session_id = CreateSession(key_id_);
 549   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 550
 551   std::vector<uint8> bad_data = encrypted_data_;
 552   bad_data[1]++;
 553
 554   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 555       bad_data, key_id_, iv_, no_subsample_entries_);
 556   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 557 }
 558
 559 TEST_F(AesDecryptorTest, EncryptedAsUnencryptedFailure) {
 560   std::string session_id = CreateSession(key_id_);
 561   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 562   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 563       encrypted_data_, key_id_, std::vector<uint8>(), no_subsample_entries_);
 564   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 565 }
 566
 567 TEST_F(AesDecryptorTest, SubsampleDecryption) {
 568   std::string session_id = CreateSession(key_id_);
 569   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 570   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 571       subsample_encrypted_data_, key_id_, iv_, normal_subsample_entries_);
 572   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 573 }
 574
 575 // Ensures noninterference of data offset and subsample mechanisms. We never
 576 // expect to encounter this in the wild, but since the DecryptConfig doesn't
 577 // disallow such a configuration, it should be covered.
 578 TEST_F(AesDecryptorTest, SubsampleDecryptionWithOffset) {
 579   std::string session_id = CreateSession(key_id_);
 580   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 581   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 582       subsample_encrypted_data_, key_id_, iv_, normal_subsample_entries_);
 583   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 584 }
 585
 586 TEST_F(AesDecryptorTest, SubsampleWrongSize) {
 587   std::string session_id = CreateSession(key_id_);
 588   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 589
 590   std::vector<SubsampleEntry> subsample_entries_wrong_size(
 591       kSubsampleEntriesWrongSize,
 592       kSubsampleEntriesWrongSize + arraysize(kSubsampleEntriesWrongSize));
 593
 594   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 595       subsample_encrypted_data_, key_id_, iv_, subsample_entries_wrong_size);
 596   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 597 }
 598
 599 TEST_F(AesDecryptorTest, SubsampleInvalidTotalSize) {
 600   std::string session_id = CreateSession(key_id_);
 601   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 602
 603   std::vector<SubsampleEntry> subsample_entries_invalid_total_size(
 604       kSubsampleEntriesInvalidTotalSize,
 605       kSubsampleEntriesInvalidTotalSize +
 606           arraysize(kSubsampleEntriesInvalidTotalSize));
 607
 608   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 609       subsample_encrypted_data_, key_id_, iv_,
 610       subsample_entries_invalid_total_size);
 611   DecryptAndExpect(encrypted_buffer, original_data_, DECRYPT_ERROR);
 612 }
 613
 614 // No cypher bytes in any of the subsamples.
 615 TEST_F(AesDecryptorTest, SubsampleClearBytesOnly) {
 616   std::string session_id = CreateSession(key_id_);
 617   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 618
 619   std::vector<SubsampleEntry> clear_only_subsample_entries(
 620       kSubsampleEntriesClearOnly,
 621       kSubsampleEntriesClearOnly + arraysize(kSubsampleEntriesClearOnly));
 622
 623   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 624       original_data_, key_id_, iv_, clear_only_subsample_entries);
 625   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 626 }
 627
 628 // No clear bytes in any of the subsamples.
 629 TEST_F(AesDecryptorTest, SubsampleCypherBytesOnly) {
 630   std::string session_id = CreateSession(key_id_);
 631   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 632
 633   std::vector<SubsampleEntry> cypher_only_subsample_entries(
 634       kSubsampleEntriesCypherOnly,
 635       kSubsampleEntriesCypherOnly + arraysize(kSubsampleEntriesCypherOnly));
 636
 637   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 638       encrypted_data_, key_id_, iv_, cypher_only_subsample_entries);
 639   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 640 }
 641
 642 TEST_F(AesDecryptorTest, CloseSession) {
 643   std::string session_id = CreateSession(key_id_);
 644   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 645       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 646
 647   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 648   ASSERT_NO_FATAL_FAILURE(
 649       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 650
 651   CloseSession(session_id);
 652 }
 653
 654 TEST_F(AesDecryptorTest, RemoveSession) {
 655   // TODO(jrummell): Clean this up when the prefixed API is removed.
 656   // http://crbug.com/249976.
 657   std::string session_id = CreateSession(key_id_);
 658   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 659       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 660
 661   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 662   ASSERT_NO_FATAL_FAILURE(
 663       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 664
 665   RemoveSession(session_id);
 666 }
 667
 668 TEST_F(AesDecryptorTest, NoKeyAfterCloseSession) {
 669   std::string session_id = CreateSession(key_id_);
 670   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 671       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 672
 673   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 674   ASSERT_NO_FATAL_FAILURE(
 675       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 676
 677   CloseSession(session_id);
 678   ASSERT_NO_FATAL_FAILURE(
 679       DecryptAndExpect(encrypted_buffer, original_data_, NO_KEY));
 680 }
 681
 682 TEST_F(AesDecryptorTest, LatestKeyUsed) {
 683   std::string session_id1 = CreateSession(key_id_);
 684   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 685       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 686
 687   // Add alternate key, buffer should not be decoded properly.
 688   UpdateSessionAndExpect(session_id1, kKeyAlternateAsJWK, RESOLVED);
 689   ASSERT_NO_FATAL_FAILURE(
 690       DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH));
 691
 692   // Create a second session with a correct key value for key_id_.
 693   std::string session_id2 = CreateSession(key_id_);
 694   UpdateSessionAndExpect(session_id2, kKeyAsJWK, RESOLVED);
 695
 696   // Should be able to decode with latest key.
 697   ASSERT_NO_FATAL_FAILURE(
 698       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 699 }
 700
 701 TEST_F(AesDecryptorTest, LatestKeyUsedAfterCloseSession) {
 702   std::string session_id1 = CreateSession(key_id_);
 703   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 704       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 705   UpdateSessionAndExpect(session_id1, kKeyAsJWK, RESOLVED);
 706   ASSERT_NO_FATAL_FAILURE(
 707       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 708
 709   // Create a second session with a different key value for key_id_.
 710   std::string session_id2 = CreateSession(key_id_);
 711   UpdateSessionAndExpect(session_id2, kKeyAlternateAsJWK, RESOLVED);
 712
 713   // Should not be able to decode with new key.
 714   ASSERT_NO_FATAL_FAILURE(
 715       DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH));
 716
 717   // Close second session, should revert to original key.
 718   CloseSession(session_id2);
 719   ASSERT_NO_FATAL_FAILURE(
 720       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 721 }
 722
 723 TEST_F(AesDecryptorTest, JWKKey) {
 724   std::string session_id = CreateSession(key_id_);
 725
 726   // Try a simple JWK key (i.e. not in a set)
 727   const std::string kJwkSimple =
 728       "{"
 729       "  \"kty\": \"oct\","
 730       "  \"alg\": \"A128KW\","
 731       "  \"kid\": \"AAECAwQFBgcICQoLDA0ODxAREhM\","
 732       "  \"k\": \"FBUWFxgZGhscHR4fICEiIw\""
 733       "}";
 734   UpdateSessionAndExpect(session_id, kJwkSimple, REJECTED);
 735
 736   // Try a key list with multiple entries.
 737   const std::string kJwksMultipleEntries =
 738       "{"
 739       "  \"keys\": ["
 740       "    {"
 741       "      \"kty\": \"oct\","
 742       "      \"alg\": \"A128KW\","
 743       "      \"kid\": \"AAECAwQFBgcICQoLDA0ODxAREhM\","
 744       "      \"k\": \"FBUWFxgZGhscHR4fICEiIw\""
 745       "    },"
 746       "    {"
 747       "      \"kty\": \"oct\","
 748       "      \"alg\": \"A128KW\","
 749       "      \"kid\": \"JCUmJygpKissLS4vMA\","
 750       "      \"k\":\"MTIzNDU2Nzg5Ojs8PT4_QA\""
 751       "    }"
 752       "  ]"
 753       "}";
 754   UpdateSessionAndExpect(session_id, kJwksMultipleEntries, RESOLVED);
 755
 756   // Try a key with no spaces and some \n plus additional fields.
 757   const std::string kJwksNoSpaces =
 758       "\n\n{\"something\":1,\"keys\":[{\n\n\"kty\":\"oct\",\"alg\":\"A128KW\","
 759       "\"kid\":\"AAECAwQFBgcICQoLDA0ODxAREhM\",\"k\":\"GawgguFyGrWKav7AX4VKUg"
 760       "\",\"foo\":\"bar\"}]}\n\n";
 761   UpdateSessionAndExpect(session_id, kJwksNoSpaces, RESOLVED);
 762
 763   // Try some non-ASCII characters.
 764   UpdateSessionAndExpect(
 765       session_id, "This is not ASCII due to \xff\xfe\xfd in it.", REJECTED);
 766
 767   // Try a badly formatted key. Assume that the JSON parser is fully tested,
 768   // so we won't try a lot of combinations. However, need a test to ensure
 769   // that the code doesn't crash if invalid JSON received.
 770   UpdateSessionAndExpect(session_id, "This is not a JSON key.", REJECTED);
 771
 772   // Try passing some valid JSON that is not a dictionary at the top level.
 773   UpdateSessionAndExpect(session_id, "40", REJECTED);
 774
 775   // Try an empty dictionary.
 776   UpdateSessionAndExpect(session_id, "{ }", REJECTED);
 777
 778   // Try an empty 'keys' dictionary.
 779   UpdateSessionAndExpect(session_id, "{ \"keys\": [] }", REJECTED);
 780
 781   // Try with 'keys' not a dictionary.
 782   UpdateSessionAndExpect(session_id, "{ \"keys\":\"1\" }", REJECTED);
 783
 784   // Try with 'keys' a list of integers.
 785   UpdateSessionAndExpect(session_id, "{ \"keys\": [ 1, 2, 3 ] }", REJECTED);
 786
 787   // Try padding(=) at end of 'k' base64 string.
 788   const std::string kJwksWithPaddedKey =
 789       "{"
 790       "  \"keys\": ["
 791       "    {"
 792       "      \"kty\": \"oct\","
 793       "      \"alg\": \"A128KW\","
 794       "      \"kid\": \"AAECAw\","
 795       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw==\""
 796       "    }"
 797       "  ]"
 798       "}";
 799   UpdateSessionAndExpect(session_id, kJwksWithPaddedKey, REJECTED);
 800
 801   // Try padding(=) at end of 'kid' base64 string.
 802   const std::string kJwksWithPaddedKeyId =
 803       "{"
 804       "  \"keys\": ["
 805       "    {"
 806       "      \"kty\": \"oct\","
 807       "      \"alg\": \"A128KW\","
 808       "      \"kid\": \"AAECAw==\","
 809       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 810       "    }"
 811       "  ]"
 812       "}";
 813   UpdateSessionAndExpect(session_id, kJwksWithPaddedKeyId, REJECTED);
 814
 815   // Try a key with invalid base64 encoding.
 816   const std::string kJwksWithInvalidBase64 =
 817       "{"
 818       "  \"keys\": ["
 819       "    {"
 820       "      \"kty\": \"oct\","
 821       "      \"alg\": \"A128KW\","
 822       "      \"kid\": \"!@#$%^&*()\","
 823       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 824       "    }"
 825       "  ]"
 826       "}";
 827   UpdateSessionAndExpect(session_id, kJwksWithInvalidBase64, REJECTED);
 828
 829   // Try a 3-byte 'kid' where no base64 padding is required.
 830   // |kJwksMultipleEntries| above has 2 'kid's that require 1 and 2 padding
 831   // bytes. Note that 'k' has to be 16 bytes, so it will always require padding.
 832   const std::string kJwksWithNoPadding =
 833       "{"
 834       "  \"keys\": ["
 835       "    {"
 836       "      \"kty\": \"oct\","
 837       "      \"alg\": \"A128KW\","
 838       "      \"kid\": \"Kiss\","
 839       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 840       "    }"
 841       "  ]"
 842       "}";
 843   UpdateSessionAndExpect(session_id, kJwksWithNoPadding, RESOLVED);
 844
 845   // Empty key id.
 846   const std::string kJwksWithEmptyKeyId =
 847       "{"
 848       "  \"keys\": ["
 849       "    {"
 850       "      \"kty\": \"oct\","
 851       "      \"alg\": \"A128KW\","
 852       "      \"kid\": \"\","
 853       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 854       "    }"
 855       "  ]"
 856       "}";
 857   UpdateSessionAndExpect(session_id, kJwksWithEmptyKeyId, REJECTED);
 858   CloseSession(session_id);
 859 }
 860
 861 TEST_F(AesDecryptorTest, GetKeyIds) {
 862   std::vector<uint8> key_id1(kKeyId, kKeyId + arraysize(kKeyId));
 863   std::vector<uint8> key_id2(kKeyId2, kKeyId2 + arraysize(kKeyId2));
 864
 865   std::string session_id = CreateSession(key_id_);
 866   EXPECT_FALSE(KeysInfoContains(key_id1));
 867   EXPECT_FALSE(KeysInfoContains(key_id2));
 868
 869   // Add 1 key, verify it is returned.
 870   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED);
 871   EXPECT_TRUE(KeysInfoContains(key_id1));
 872   EXPECT_FALSE(KeysInfoContains(key_id2));
 873
 874   // Add second key, verify both IDs returned.
 875   UpdateSessionAndExpect(session_id, kKey2AsJWK, RESOLVED);
 876   EXPECT_TRUE(KeysInfoContains(key_id1));
 877   EXPECT_TRUE(KeysInfoContains(key_id2));
 878 }
 879
 880 }  // namespace media