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)
 256         << "Unexpectedly rejected with message: " << error_message;
 257   }
 258
 259   scoped_ptr<SimpleCdmPromise> CreatePromise(PromiseResult expected_result) {
 260     scoped_ptr<SimpleCdmPromise> promise(
 261         new CdmCallbackPromise<>(base::Bind(&AesDecryptorTest::OnResolve,
 262                                             base::Unretained(this),
 263                                             expected_result),
 264                                  base::Bind(&AesDecryptorTest::OnReject,
 265                                             base::Unretained(this),
 266                                             expected_result)));
 267     return promise.Pass();
 268   }
 269
 270   scoped_ptr<NewSessionCdmPromise> CreateSessionPromise(
 271       PromiseResult expected_result) {
 272     scoped_ptr<NewSessionCdmPromise> promise(
 273         new CdmCallbackPromise<std::string>(
 274             base::Bind(&AesDecryptorTest::OnResolveWithSession,
 275                        base::Unretained(this),
 276                        expected_result),
 277             base::Bind(&AesDecryptorTest::OnReject,
 278                        base::Unretained(this),
 279                        expected_result)));
 280     return promise.Pass();
 281   }
 282
 283   // Creates a new session using |key_id|. Returns the session ID.
 284   std::string CreateSession(const std::vector<uint8>& key_id) {
 285     DCHECK(!key_id.empty());
 286     EXPECT_CALL(*this, OnSessionMessage(IsNotEmpty(), _, IsJSONDictionary(),
 287                                         GURL::EmptyGURL()));
 288     decryptor_.CreateSessionAndGenerateRequest(
 289         MediaKeys::TEMPORARY_SESSION, EmeInitDataType::WEBM, &key_id[0],
 290         key_id.size(), CreateSessionPromise(RESOLVED));
 291     // This expects the promise to be called synchronously, which is the case
 292     // for AesDecryptor.
 293     return session_id_;
 294   }
 295
 296   // Closes the session specified by |session_id|.
 297   void CloseSession(const std::string& session_id) {
 298     EXPECT_CALL(*this, OnSessionClosed(session_id));
 299     decryptor_.CloseSession(session_id, CreatePromise(RESOLVED));
 300   }
 301
 302   // Removes the session specified by |session_id|. This should simply do a
 303   // CloseSession().
 304   // TODO(jrummell): Clean this up when the prefixed API is removed.
 305   // http://crbug.com/249976.
 306   void RemoveSession(const std::string& session_id) {
 307     EXPECT_CALL(*this, OnSessionClosed(session_id));
 308     decryptor_.RemoveSession(session_id, CreatePromise(RESOLVED));
 309   }
 310
 311   MOCK_METHOD2(OnSessionKeysChangeCalled,
 312                void(const std::string& session_id,
 313                     bool has_additional_usable_key));
 314
 315   void OnSessionKeysChange(const std::string& session_id,
 316                            bool has_additional_usable_key,
 317                            CdmKeysInfo keys_info) {
 318     keys_info_.swap(keys_info);
 319     OnSessionKeysChangeCalled(session_id, has_additional_usable_key);
 320   }
 321
 322   // Updates the session specified by |session_id| with |key|. |result|
 323   // tests that the update succeeds or generates an error.
 324   void UpdateSessionAndExpect(std::string session_id,
 325                               const std::string& key,
 326                               PromiseResult expected_result,
 327                               bool new_key_expected) {
 328     DCHECK(!key.empty());
 329
 330     if (expected_result == RESOLVED) {
 331       EXPECT_CALL(*this,
 332                   OnSessionKeysChangeCalled(session_id, new_key_expected));
 333     } else {
 334       EXPECT_CALL(*this, OnSessionKeysChangeCalled(_, _)).Times(0);
 335     }
 336
 337     decryptor_.UpdateSession(session_id,
 338                              reinterpret_cast<const uint8*>(key.c_str()),
 339                              key.length(),
 340                              CreatePromise(expected_result));
 341   }
 342
 343   bool KeysInfoContains(std::vector<uint8> expected) {
 344     for (const auto& key_id : keys_info_) {
 345       if (key_id->key_id == expected)
 346         return true;
 347     }
 348     return false;
 349   }
 350
 351   MOCK_METHOD2(BufferDecrypted, void(Decryptor::Status,
 352                                      const scoped_refptr<DecoderBuffer>&));
 353
 354   enum DecryptExpectation {
 355     SUCCESS,
 356     DATA_MISMATCH,
 357     DATA_AND_SIZE_MISMATCH,
 358     DECRYPT_ERROR,
 359     NO_KEY
 360   };
 361
 362   void DecryptAndExpect(const scoped_refptr<DecoderBuffer>& encrypted,
 363                         const std::vector<uint8>& plain_text,
 364                         DecryptExpectation result) {
 365     scoped_refptr<DecoderBuffer> decrypted;
 366
 367     switch (result) {
 368       case SUCCESS:
 369       case DATA_MISMATCH:
 370       case DATA_AND_SIZE_MISMATCH:
 371         EXPECT_CALL(*this, BufferDecrypted(Decryptor::kSuccess, NotNull()))
 372             .WillOnce(SaveArg<1>(&decrypted));
 373         break;
 374       case DECRYPT_ERROR:
 375         EXPECT_CALL(*this, BufferDecrypted(Decryptor::kError, IsNull()))
 376             .WillOnce(SaveArg<1>(&decrypted));
 377         break;
 378       case NO_KEY:
 379         EXPECT_CALL(*this, BufferDecrypted(Decryptor::kNoKey, IsNull()))
 380             .WillOnce(SaveArg<1>(&decrypted));
 381         break;
 382     }
 383
 384     decryptor_.Decrypt(Decryptor::kVideo, encrypted, decrypt_cb_);
 385
 386     std::vector<uint8> decrypted_text;
 387     if (decrypted.get() && decrypted->data_size()) {
 388       decrypted_text.assign(
 389         decrypted->data(), decrypted->data() + decrypted->data_size());
 390     }
 391
 392     switch (result) {
 393       case SUCCESS:
 394         EXPECT_EQ(plain_text, decrypted_text);
 395         break;
 396       case DATA_MISMATCH:
 397         EXPECT_EQ(plain_text.size(), decrypted_text.size());
 398         EXPECT_NE(plain_text, decrypted_text);
 399         break;
 400       case DATA_AND_SIZE_MISMATCH:
 401         EXPECT_NE(plain_text.size(), decrypted_text.size());
 402         break;
 403       case DECRYPT_ERROR:
 404       case NO_KEY:
 405         EXPECT_TRUE(decrypted_text.empty());
 406         break;
 407     }
 408   }
 409
 410   MOCK_METHOD4(OnSessionMessage,
 411                void(const std::string& session_id,
 412                     MediaKeys::MessageType message_type,
 413                     const std::vector<uint8>& message,
 414                     const GURL& legacy_destination_url));
 415   MOCK_METHOD1(OnSessionClosed, void(const std::string& session_id));
 416
 417   AesDecryptor decryptor_;
 418   AesDecryptor::DecryptCB decrypt_cb_;
 419   std::string session_id_;
 420   CdmKeysInfo keys_info_;
 421
 422   // Constants for testing.
 423   const std::vector<uint8> original_data_;
 424   const std::vector<uint8> encrypted_data_;
 425   const std::vector<uint8> subsample_encrypted_data_;
 426   const std::vector<uint8> key_id_;
 427   const std::vector<uint8> iv_;
 428   const std::vector<SubsampleEntry> normal_subsample_entries_;
 429   const std::vector<SubsampleEntry> no_subsample_entries_;
 430 };
 431
 432 TEST_F(AesDecryptorTest, CreateSessionWithNullInitData) {
 433   EXPECT_CALL(*this,
 434               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 435   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 436                                              EmeInitDataType::WEBM, NULL, 0,
 437                                              CreateSessionPromise(RESOLVED));
 438 }
 439
 440 TEST_F(AesDecryptorTest, MultipleCreateSession) {
 441   EXPECT_CALL(*this,
 442               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 443   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 444                                              EmeInitDataType::WEBM, NULL, 0,
 445                                              CreateSessionPromise(RESOLVED));
 446
 447   EXPECT_CALL(*this,
 448               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 449   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 450                                              EmeInitDataType::WEBM, NULL, 0,
 451                                              CreateSessionPromise(RESOLVED));
 452
 453   EXPECT_CALL(*this,
 454               OnSessionMessage(IsNotEmpty(), _, IsEmpty(), GURL::EmptyGURL()));
 455   decryptor_.CreateSessionAndGenerateRequest(MediaKeys::TEMPORARY_SESSION,
 456                                              EmeInitDataType::WEBM, NULL, 0,
 457                                              CreateSessionPromise(RESOLVED));
 458 }
 459
 460 TEST_F(AesDecryptorTest, CreateSessionWithCencInitData) {
 461   const uint8 init_data[] = {
 462       0x00, 0x00, 0x00, 0x44,                          // size = 68
 463       0x70, 0x73, 0x73, 0x68,                          // 'pssh'
 464       0x01,                                            // version
 465       0x00, 0x00, 0x00,                                // flags
 466       0x10, 0x77, 0xEF, 0xEC, 0xC0, 0xB2, 0x4D, 0x02,  // SystemID
 467       0xAC, 0xE3, 0x3C, 0x1E, 0x52, 0xE2, 0xFB, 0x4B,
 468       0x00, 0x00, 0x00, 0x02,                          // key count
 469       0x7E, 0x57, 0x1D, 0x03, 0x7E, 0x57, 0x1D, 0x03,  // key1
 470       0x7E, 0x57, 0x1D, 0x03, 0x7E, 0x57, 0x1D, 0x03,
 471       0x7E, 0x57, 0x1D, 0x04, 0x7E, 0x57, 0x1D, 0x04,  // key2
 472       0x7E, 0x57, 0x1D, 0x04, 0x7E, 0x57, 0x1D, 0x04,
 473       0x00, 0x00, 0x00, 0x00  // datasize
 474   };
 475   EXPECT_CALL(*this, OnSessionMessage(IsNotEmpty(), _, IsJSONDictionary(),
 476                                       GURL::EmptyGURL()));
 477   decryptor_.CreateSessionAndGenerateRequest(
 478       MediaKeys::TEMPORARY_SESSION, EmeInitDataType::CENC, init_data,
 479       arraysize(init_data), CreateSessionPromise(RESOLVED));
 480 }
 481
 482 TEST_F(AesDecryptorTest, CreateSessionWithKeyIdsInitData) {
 483   const char init_data[] =
 484       "{\"kids\":[\"AQI\",\"AQIDBA\",\"AQIDBAUGBwgJCgsMDQ4PEA\"]}";
 485
 486   EXPECT_CALL(*this, OnSessionMessage(IsNotEmpty(), _, IsJSONDictionary(),
 487                                       GURL::EmptyGURL()));
 488   decryptor_.CreateSessionAndGenerateRequest(
 489       MediaKeys::TEMPORARY_SESSION, EmeInitDataType::KEYIDS,
 490       reinterpret_cast<const uint8*>(init_data), arraysize(init_data) - 1,
 491       CreateSessionPromise(RESOLVED));
 492 }
 493
 494 TEST_F(AesDecryptorTest, NormalDecryption) {
 495   std::string session_id = CreateSession(key_id_);
 496   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 497   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 498       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 499   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 500 }
 501
 502 TEST_F(AesDecryptorTest, UnencryptedFrame) {
 503   // An empty iv string signals that the frame is unencrypted.
 504   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 505       original_data_, key_id_, std::vector<uint8>(), no_subsample_entries_);
 506   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 507 }
 508
 509 TEST_F(AesDecryptorTest, WrongKey) {
 510   std::string session_id = CreateSession(key_id_);
 511   UpdateSessionAndExpect(session_id, kWrongKeyAsJWK, RESOLVED, true);
 512   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 513       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 514   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 515 }
 516
 517 TEST_F(AesDecryptorTest, NoKey) {
 518   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 519       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 520   EXPECT_CALL(*this, BufferDecrypted(AesDecryptor::kNoKey, IsNull()));
 521   decryptor_.Decrypt(Decryptor::kVideo, encrypted_buffer, decrypt_cb_);
 522 }
 523
 524 TEST_F(AesDecryptorTest, KeyReplacement) {
 525   std::string session_id = CreateSession(key_id_);
 526   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 527       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 528
 529   UpdateSessionAndExpect(session_id, kWrongKeyAsJWK, RESOLVED, true);
 530   ASSERT_NO_FATAL_FAILURE(DecryptAndExpect(
 531       encrypted_buffer, original_data_, DATA_MISMATCH));
 532
 533   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, false);
 534   ASSERT_NO_FATAL_FAILURE(
 535       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 536 }
 537
 538 TEST_F(AesDecryptorTest, WrongSizedKey) {
 539   std::string session_id = CreateSession(key_id_);
 540   UpdateSessionAndExpect(session_id, kWrongSizedKeyAsJWK, REJECTED, true);
 541 }
 542
 543 TEST_F(AesDecryptorTest, MultipleKeysAndFrames) {
 544   std::string session_id = CreateSession(key_id_);
 545   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 546   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 547       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 548   ASSERT_NO_FATAL_FAILURE(
 549       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 550
 551   UpdateSessionAndExpect(session_id, kKey2AsJWK, RESOLVED, true);
 552
 553   // The first key is still available after we added a second key.
 554   ASSERT_NO_FATAL_FAILURE(
 555       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 556
 557   // The second key is also available.
 558   encrypted_buffer = CreateEncryptedBuffer(
 559       std::vector<uint8>(kEncryptedData2,
 560                          kEncryptedData2 + arraysize(kEncryptedData2)),
 561       std::vector<uint8>(kKeyId2, kKeyId2 + arraysize(kKeyId2)),
 562       std::vector<uint8>(kIv2, kIv2 + arraysize(kIv2)),
 563       no_subsample_entries_);
 564   ASSERT_NO_FATAL_FAILURE(DecryptAndExpect(
 565       encrypted_buffer,
 566       std::vector<uint8>(kOriginalData2,
 567                          kOriginalData2 + arraysize(kOriginalData2) - 1),
 568       SUCCESS));
 569 }
 570
 571 TEST_F(AesDecryptorTest, CorruptedIv) {
 572   std::string session_id = CreateSession(key_id_);
 573   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 574
 575   std::vector<uint8> bad_iv = iv_;
 576   bad_iv[1]++;
 577
 578   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 579       encrypted_data_, key_id_, bad_iv, no_subsample_entries_);
 580
 581   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 582 }
 583
 584 TEST_F(AesDecryptorTest, CorruptedData) {
 585   std::string session_id = CreateSession(key_id_);
 586   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 587
 588   std::vector<uint8> bad_data = encrypted_data_;
 589   bad_data[1]++;
 590
 591   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 592       bad_data, key_id_, iv_, no_subsample_entries_);
 593   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 594 }
 595
 596 TEST_F(AesDecryptorTest, EncryptedAsUnencryptedFailure) {
 597   std::string session_id = CreateSession(key_id_);
 598   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 599   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 600       encrypted_data_, key_id_, std::vector<uint8>(), no_subsample_entries_);
 601   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 602 }
 603
 604 TEST_F(AesDecryptorTest, SubsampleDecryption) {
 605   std::string session_id = CreateSession(key_id_);
 606   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 607   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 608       subsample_encrypted_data_, key_id_, iv_, normal_subsample_entries_);
 609   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 610 }
 611
 612 // Ensures noninterference of data offset and subsample mechanisms. We never
 613 // expect to encounter this in the wild, but since the DecryptConfig doesn't
 614 // disallow such a configuration, it should be covered.
 615 TEST_F(AesDecryptorTest, SubsampleDecryptionWithOffset) {
 616   std::string session_id = CreateSession(key_id_);
 617   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 618   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 619       subsample_encrypted_data_, key_id_, iv_, normal_subsample_entries_);
 620   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 621 }
 622
 623 TEST_F(AesDecryptorTest, SubsampleWrongSize) {
 624   std::string session_id = CreateSession(key_id_);
 625   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 626
 627   std::vector<SubsampleEntry> subsample_entries_wrong_size(
 628       kSubsampleEntriesWrongSize,
 629       kSubsampleEntriesWrongSize + arraysize(kSubsampleEntriesWrongSize));
 630
 631   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 632       subsample_encrypted_data_, key_id_, iv_, subsample_entries_wrong_size);
 633   DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH);
 634 }
 635
 636 TEST_F(AesDecryptorTest, SubsampleInvalidTotalSize) {
 637   std::string session_id = CreateSession(key_id_);
 638   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 639
 640   std::vector<SubsampleEntry> subsample_entries_invalid_total_size(
 641       kSubsampleEntriesInvalidTotalSize,
 642       kSubsampleEntriesInvalidTotalSize +
 643           arraysize(kSubsampleEntriesInvalidTotalSize));
 644
 645   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 646       subsample_encrypted_data_, key_id_, iv_,
 647       subsample_entries_invalid_total_size);
 648   DecryptAndExpect(encrypted_buffer, original_data_, DECRYPT_ERROR);
 649 }
 650
 651 // No cypher bytes in any of the subsamples.
 652 TEST_F(AesDecryptorTest, SubsampleClearBytesOnly) {
 653   std::string session_id = CreateSession(key_id_);
 654   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 655
 656   std::vector<SubsampleEntry> clear_only_subsample_entries(
 657       kSubsampleEntriesClearOnly,
 658       kSubsampleEntriesClearOnly + arraysize(kSubsampleEntriesClearOnly));
 659
 660   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 661       original_data_, key_id_, iv_, clear_only_subsample_entries);
 662   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 663 }
 664
 665 // No clear bytes in any of the subsamples.
 666 TEST_F(AesDecryptorTest, SubsampleCypherBytesOnly) {
 667   std::string session_id = CreateSession(key_id_);
 668   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 669
 670   std::vector<SubsampleEntry> cypher_only_subsample_entries(
 671       kSubsampleEntriesCypherOnly,
 672       kSubsampleEntriesCypherOnly + arraysize(kSubsampleEntriesCypherOnly));
 673
 674   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 675       encrypted_data_, key_id_, iv_, cypher_only_subsample_entries);
 676   DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS);
 677 }
 678
 679 TEST_F(AesDecryptorTest, CloseSession) {
 680   std::string session_id = CreateSession(key_id_);
 681   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 682       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 683
 684   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 685   ASSERT_NO_FATAL_FAILURE(
 686       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 687
 688   CloseSession(session_id);
 689 }
 690
 691 TEST_F(AesDecryptorTest, RemoveSession) {
 692   // TODO(jrummell): Clean this up when the prefixed API is removed.
 693   // http://crbug.com/249976.
 694   std::string session_id = CreateSession(key_id_);
 695   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 696       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 697
 698   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 699   ASSERT_NO_FATAL_FAILURE(
 700       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 701
 702   RemoveSession(session_id);
 703 }
 704
 705 TEST_F(AesDecryptorTest, NoKeyAfterCloseSession) {
 706   std::string session_id = CreateSession(key_id_);
 707   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 708       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 709
 710   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 711   ASSERT_NO_FATAL_FAILURE(
 712       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 713
 714   CloseSession(session_id);
 715   ASSERT_NO_FATAL_FAILURE(
 716       DecryptAndExpect(encrypted_buffer, original_data_, NO_KEY));
 717 }
 718
 719 TEST_F(AesDecryptorTest, LatestKeyUsed) {
 720   std::string session_id1 = CreateSession(key_id_);
 721   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 722       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 723
 724   // Add alternate key, buffer should not be decoded properly.
 725   UpdateSessionAndExpect(session_id1, kKeyAlternateAsJWK, RESOLVED, true);
 726   ASSERT_NO_FATAL_FAILURE(
 727       DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH));
 728
 729   // Create a second session with a correct key value for key_id_.
 730   std::string session_id2 = CreateSession(key_id_);
 731   UpdateSessionAndExpect(session_id2, kKeyAsJWK, RESOLVED, true);
 732
 733   // Should be able to decode with latest key.
 734   ASSERT_NO_FATAL_FAILURE(
 735       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 736 }
 737
 738 TEST_F(AesDecryptorTest, LatestKeyUsedAfterCloseSession) {
 739   std::string session_id1 = CreateSession(key_id_);
 740   scoped_refptr<DecoderBuffer> encrypted_buffer = CreateEncryptedBuffer(
 741       encrypted_data_, key_id_, iv_, no_subsample_entries_);
 742   UpdateSessionAndExpect(session_id1, kKeyAsJWK, RESOLVED, true);
 743   ASSERT_NO_FATAL_FAILURE(
 744       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 745
 746   // Create a second session with a different key value for key_id_.
 747   std::string session_id2 = CreateSession(key_id_);
 748   UpdateSessionAndExpect(session_id2, kKeyAlternateAsJWK, RESOLVED, true);
 749
 750   // Should not be able to decode with new key.
 751   ASSERT_NO_FATAL_FAILURE(
 752       DecryptAndExpect(encrypted_buffer, original_data_, DATA_MISMATCH));
 753
 754   // Close second session, should revert to original key.
 755   CloseSession(session_id2);
 756   ASSERT_NO_FATAL_FAILURE(
 757       DecryptAndExpect(encrypted_buffer, original_data_, SUCCESS));
 758 }
 759
 760 TEST_F(AesDecryptorTest, JWKKey) {
 761   std::string session_id = CreateSession(key_id_);
 762
 763   // Try a simple JWK key (i.e. not in a set)
 764   const std::string kJwkSimple =
 765       "{"
 766       "  \"kty\": \"oct\","
 767       "  \"alg\": \"A128KW\","
 768       "  \"kid\": \"AAECAwQFBgcICQoLDA0ODxAREhM\","
 769       "  \"k\": \"FBUWFxgZGhscHR4fICEiIw\""
 770       "}";
 771   UpdateSessionAndExpect(session_id, kJwkSimple, REJECTED, true);
 772
 773   // Try a key list with multiple entries.
 774   const std::string kJwksMultipleEntries =
 775       "{"
 776       "  \"keys\": ["
 777       "    {"
 778       "      \"kty\": \"oct\","
 779       "      \"alg\": \"A128KW\","
 780       "      \"kid\": \"AAECAwQFBgcICQoLDA0ODxAREhM\","
 781       "      \"k\": \"FBUWFxgZGhscHR4fICEiIw\""
 782       "    },"
 783       "    {"
 784       "      \"kty\": \"oct\","
 785       "      \"alg\": \"A128KW\","
 786       "      \"kid\": \"JCUmJygpKissLS4vMA\","
 787       "      \"k\":\"MTIzNDU2Nzg5Ojs8PT4_QA\""
 788       "    }"
 789       "  ]"
 790       "}";
 791   UpdateSessionAndExpect(session_id, kJwksMultipleEntries, RESOLVED, true);
 792
 793   // Try a key with no spaces and some \n plus additional fields.
 794   const std::string kJwksNoSpaces =
 795       "\n\n{\"something\":1,\"keys\":[{\n\n\"kty\":\"oct\",\"alg\":\"A128KW\","
 796       "\"kid\":\"AQIDBAUGBwgJCgsMCg4PAA\",\"k\":\"GawgguFyGrWKav7AX4VKUg"
 797       "\",\"foo\":\"bar\"}]}\n\n";
 798   UpdateSessionAndExpect(session_id, kJwksNoSpaces, RESOLVED, true);
 799
 800   // Try some non-ASCII characters.
 801   UpdateSessionAndExpect(session_id,
 802                          "This is not ASCII due to \xff\xfe\xfd in it.",
 803                          REJECTED, true);
 804
 805   // Try a badly formatted key. Assume that the JSON parser is fully tested,
 806   // so we won't try a lot of combinations. However, need a test to ensure
 807   // that the code doesn't crash if invalid JSON received.
 808   UpdateSessionAndExpect(session_id, "This is not a JSON key.", REJECTED, true);
 809
 810   // Try passing some valid JSON that is not a dictionary at the top level.
 811   UpdateSessionAndExpect(session_id, "40", REJECTED, true);
 812
 813   // Try an empty dictionary.
 814   UpdateSessionAndExpect(session_id, "{ }", REJECTED, true);
 815
 816   // Try an empty 'keys' dictionary.
 817   UpdateSessionAndExpect(session_id, "{ \"keys\": [] }", REJECTED, true);
 818
 819   // Try with 'keys' not a dictionary.
 820   UpdateSessionAndExpect(session_id, "{ \"keys\":\"1\" }", REJECTED, true);
 821
 822   // Try with 'keys' a list of integers.
 823   UpdateSessionAndExpect(session_id, "{ \"keys\": [ 1, 2, 3 ] }", REJECTED,
 824                          true);
 825
 826   // Try padding(=) at end of 'k' base64 string.
 827   const std::string kJwksWithPaddedKey =
 828       "{"
 829       "  \"keys\": ["
 830       "    {"
 831       "      \"kty\": \"oct\","
 832       "      \"alg\": \"A128KW\","
 833       "      \"kid\": \"AAECAw\","
 834       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw==\""
 835       "    }"
 836       "  ]"
 837       "}";
 838   UpdateSessionAndExpect(session_id, kJwksWithPaddedKey, REJECTED, true);
 839
 840   // Try padding(=) at end of 'kid' base64 string.
 841   const std::string kJwksWithPaddedKeyId =
 842       "{"
 843       "  \"keys\": ["
 844       "    {"
 845       "      \"kty\": \"oct\","
 846       "      \"alg\": \"A128KW\","
 847       "      \"kid\": \"AAECAw==\","
 848       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 849       "    }"
 850       "  ]"
 851       "}";
 852   UpdateSessionAndExpect(session_id, kJwksWithPaddedKeyId, REJECTED, true);
 853
 854   // Try a key with invalid base64 encoding.
 855   const std::string kJwksWithInvalidBase64 =
 856       "{"
 857       "  \"keys\": ["
 858       "    {"
 859       "      \"kty\": \"oct\","
 860       "      \"alg\": \"A128KW\","
 861       "      \"kid\": \"!@#$%^&*()\","
 862       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 863       "    }"
 864       "  ]"
 865       "}";
 866   UpdateSessionAndExpect(session_id, kJwksWithInvalidBase64, REJECTED, true);
 867
 868   // Try a 3-byte 'kid' where no base64 padding is required.
 869   // |kJwksMultipleEntries| above has 2 'kid's that require 1 and 2 padding
 870   // bytes. Note that 'k' has to be 16 bytes, so it will always require padding.
 871   const std::string kJwksWithNoPadding =
 872       "{"
 873       "  \"keys\": ["
 874       "    {"
 875       "      \"kty\": \"oct\","
 876       "      \"alg\": \"A128KW\","
 877       "      \"kid\": \"Kiss\","
 878       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 879       "    }"
 880       "  ]"
 881       "}";
 882   UpdateSessionAndExpect(session_id, kJwksWithNoPadding, RESOLVED, true);
 883
 884   // Empty key id.
 885   const std::string kJwksWithEmptyKeyId =
 886       "{"
 887       "  \"keys\": ["
 888       "    {"
 889       "      \"kty\": \"oct\","
 890       "      \"alg\": \"A128KW\","
 891       "      \"kid\": \"\","
 892       "      \"k\": \"BAUGBwgJCgsMDQ4PEBESEw\""
 893       "    }"
 894       "  ]"
 895       "}";
 896   UpdateSessionAndExpect(session_id, kJwksWithEmptyKeyId, REJECTED, true);
 897   CloseSession(session_id);
 898 }
 899
 900 TEST_F(AesDecryptorTest, GetKeyIds) {
 901   std::vector<uint8> key_id1(kKeyId, kKeyId + arraysize(kKeyId));
 902   std::vector<uint8> key_id2(kKeyId2, kKeyId2 + arraysize(kKeyId2));
 903
 904   std::string session_id = CreateSession(key_id_);
 905   EXPECT_FALSE(KeysInfoContains(key_id1));
 906   EXPECT_FALSE(KeysInfoContains(key_id2));
 907
 908   // Add 1 key, verify it is returned.
 909   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 910   EXPECT_TRUE(KeysInfoContains(key_id1));
 911   EXPECT_FALSE(KeysInfoContains(key_id2));
 912
 913   // Add second key, verify both IDs returned.
 914   UpdateSessionAndExpect(session_id, kKey2AsJWK, RESOLVED, true);
 915   EXPECT_TRUE(KeysInfoContains(key_id1));
 916   EXPECT_TRUE(KeysInfoContains(key_id2));
 917 }
 918
 919 TEST_F(AesDecryptorTest, NoKeysChangeForSameKey) {
 920   std::vector<uint8> key_id(kKeyId, kKeyId + arraysize(kKeyId));
 921
 922   std::string session_id = CreateSession(key_id_);
 923   EXPECT_FALSE(KeysInfoContains(key_id));
 924
 925   // Add key, verify it is returned.
 926   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, true);
 927   EXPECT_TRUE(KeysInfoContains(key_id));
 928
 929   // Add key a second time.
 930   UpdateSessionAndExpect(session_id, kKeyAsJWK, RESOLVED, false);
 931   EXPECT_TRUE(KeysInfoContains(key_id));
 932
 933   // Create a new session. Add key, should indicate key added for this session.
 934   std::string session_id2 = CreateSession(key_id_);
 935   UpdateSessionAndExpect(session_id2, kKeyAsJWK, RESOLVED, true);
 936 }
 937
 938 }  // namespace media