Generalize AesDecryptor to make it more spec compliant.

media/crypto/aes_decryptor_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
+#include "base/basictypes.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decrypt_config.h"
+#include "media/base/mock_filters.h"
 #include "media/crypto/aes_decryptor.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using ::testing::_;
+using ::testing::Gt;
+using ::testing::NotNull;
+using ::testing::SaveArg;
+using ::testing::StrNe;
+
 namespace media {
 
-// |kEncryptedData| is encrypted from |kOriginalData| using |kRightKey|, whose
-// length is |kKeySize|. Modifying any of these independently would fail the
-// test.
-static const char kOriginalData[] = "Original data.";
-static const int kEncryptedDataSize = 16;
-static const unsigned char kEncryptedData[] =
-    "\x82\x3A\x76\x92\xEC\x7F\xF8\x85\xEC\x23\x52\xFB\x19\xB1\xB9\x09";
-static const int kKeySize = 16;
-static const unsigned char kRightKey[] = "A wonderful key!";
-static const unsigned char kWrongKey[] = "I'm a wrong key.";
-static const int kKeyIdSize = 9;
-static const unsigned char kKeyId1[] = "Key ID 1.";
-static const unsigned char kKeyId2[] = "Key ID 2.";
+static const char kClearKeySystem[] = "org.w3.clearkey";
+static const uint8 kInitData[] = { 0x69, 0x6e, 0x69, 0x74 };
+// |kEncryptedData| is encrypted from |kOriginalData| using |kRightKey|.
+// Modifying any of these independently would fail the test.
+static const uint8 kOriginalData[] = {
+  0x4f, 0x72, 0x69, 0x67, 0x69, 0x6e, 0x61, 0x6c,
+  0x20, 0x64, 0x61, 0x74, 0x61, 0x2e
+};
+static const uint8 kEncryptedData[] = {
+  0x82, 0x3A, 0x76, 0x92, 0xEC, 0x7F, 0xF8, 0x85,
+  0xEC, 0x23, 0x52, 0xFB, 0x19, 0xB1, 0xB9, 0x09
+};
+static const uint8 kRightKey[] = {
+  0x41, 0x20, 0x77, 0x6f, 0x6e, 0x64, 0x65, 0x72,
+  0x66, 0x75, 0x6c, 0x20, 0x6b, 0x65, 0x79, 0x21
+};
+static const uint8 kWrongKey[] = {
+  0x49, 0x27, 0x6d, 0x20, 0x61, 0x20, 0x77, 0x72,
+  0x6f, 0x6e, 0x67, 0x20, 0x6b, 0x65, 0x79, 0x2e
+};
+static const uint8 kWrongSizedKey[] = { 0x20, 0x20 };
+static const uint8 kKeyId1[] = {
+  0x4b, 0x65, 0x79, 0x20, 0x49, 0x44, 0x20, 0x31
+};
+static const uint8 kKeyId2[] = {
+  0x4b, 0x65, 0x79, 0x20, 0x49, 0x44, 0x20, 0x32
+};
 
 class AesDecryptorTest : public testing::Test {
  public:
-  AesDecryptorTest() {
-    encrypted_data_ = DecoderBuffer::CopyFrom(
-        kEncryptedData, kEncryptedDataSize);
+  AesDecryptorTest() : decryptor_(&client_) {
+    encrypted_data_ = DecoderBuffer::CopyFrom(kEncryptedData,
+                                              arraysize(kEncryptedData));
+    EXPECT_CALL(client_, KeyMessageMock(kClearKeySystem, StrNe(std::string()),

[ddorwin, 2012/06/14 21:00:13]

This is the type of work that would normally be done in SetUp(). However, I
don't think we should hide it here, even though it avoids code duplication. In
the future, you may, for example, want a test that calls AddKey() without GKR()
and you'll have to change all the tests.

[xhwang, 2012/06/15 01:41:04]

Done.

+                                        NotNull(), Gt(0), ""))
+        .WillOnce(SaveArg<1>(&session_id_string_));
+    decryptor_.GenerateKeyRequest(kClearKeySystem,
+                                  kInitData, arraysize(kInitData));
   }
 
  protected:
-  void SetKeyIdForEncryptedData(const uint8* key_id, int key_id_size) {
+  template <int KeyIdSize, int KeySize>
+  void AddKeyAndExpectToSucceed(const uint8 (&key_id)[KeyIdSize],
+                                const uint8 (&key)[KeySize]) {
+    EXPECT_CALL(client_, KeyAdded(kClearKeySystem, session_id_string_));
+    decryptor_.AddKey(kClearKeySystem, key, KeySize, key_id, KeyIdSize,
+                      session_id_string_);
+  }
+
+  template <int KeyIdSize, int KeySize>
+  void AddKeyAndExpectToFail(const uint8 (&key_id)[KeyIdSize],
+                             const uint8 (&key)[KeySize]) {
+    EXPECT_CALL(client_, KeyError(kClearKeySystem, session_id_string_,
+                                  AesDecryptor::kUnknownError, 0));
+    decryptor_.AddKey(kClearKeySystem, key, KeySize, key_id, KeyIdSize,
+                      session_id_string_);
+  }
+
+  template <int KeyIdSize>
+  void SetKeyIdForEncryptedData(const uint8 (&key_id)[KeyIdSize]) {
     encrypted_data_->SetDecryptConfig(
-        scoped_ptr<DecryptConfig>(new DecryptConfig(key_id, key_id_size)));
+        scoped_ptr<DecryptConfig>(new DecryptConfig(key_id, KeyIdSize)));
   }
 
   void DecryptAndExpectToSucceed() {
     scoped_refptr<DecoderBuffer> decrypted =
         decryptor_.Decrypt(encrypted_data_);
     ASSERT_TRUE(decrypted);
-    int data_length = sizeof(kOriginalData) - 1;
+    int data_length = sizeof(kOriginalData);
     ASSERT_EQ(data_length, decrypted->GetDataSize());
     EXPECT_EQ(0, memcmp(kOriginalData, decrypted->GetData(), data_length));
   }
 
   void DecryptAndExpectToFail() {
     scoped_refptr<DecoderBuffer> decrypted =
         decryptor_.Decrypt(encrypted_data_);
     EXPECT_FALSE(decrypted);
   }
 
   scoped_refptr<DecoderBuffer> encrypted_data_;
+  MockDecryptorClient client_;
   AesDecryptor decryptor_;
+  std::string session_id_string_;
 };
 
 TEST_F(AesDecryptorTest, NormalDecryption) {
-  decryptor_.AddKey(kKeyId1, kKeyIdSize, kRightKey, kKeySize);
-  SetKeyIdForEncryptedData(kKeyId1, kKeyIdSize);
+  AddKeyAndExpectToSucceed(kKeyId1, kRightKey);
+  SetKeyIdForEncryptedData(kKeyId1);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToSucceed());
 }
 
 TEST_F(AesDecryptorTest, WrongKey) {
-  decryptor_.AddKey(kKeyId1, kKeyIdSize, kWrongKey, kKeySize);
-  SetKeyIdForEncryptedData(kKeyId1, kKeyIdSize);
+  AddKeyAndExpectToSucceed(kKeyId1, kWrongKey);
+  SetKeyIdForEncryptedData(kKeyId1);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail());
 }
 
 TEST_F(AesDecryptorTest, MultipleKeys) {
-  decryptor_.AddKey(kKeyId1, kKeyIdSize, kRightKey, kKeySize);
-  decryptor_.AddKey(kKeyId2, kKeyIdSize, kWrongKey, kKeySize);
-  SetKeyIdForEncryptedData(kKeyId1, kKeyIdSize);
+  AddKeyAndExpectToSucceed(kKeyId1, kRightKey);
+  AddKeyAndExpectToSucceed(kKeyId2, kWrongKey);
+  SetKeyIdForEncryptedData(kKeyId1);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToSucceed());
 }
 
 TEST_F(AesDecryptorTest, KeyReplacement) {
-  SetKeyIdForEncryptedData(kKeyId1, kKeyIdSize);
-  decryptor_.AddKey(kKeyId1, kKeyIdSize, kWrongKey, kKeySize);
+  SetKeyIdForEncryptedData(kKeyId1);
+  AddKeyAndExpectToSucceed(kKeyId1, kWrongKey);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail());
-  decryptor_.AddKey(kKeyId1, kKeyIdSize, kRightKey, kKeySize);
+  AddKeyAndExpectToSucceed(kKeyId1, kRightKey);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToSucceed());
 }
 
+TEST_F(AesDecryptorTest, WrongSizedKey) {
+  AddKeyAndExpectToFail(kKeyId1, kWrongSizedKey);
+}
+
 }  // media