media/gmp-clearkey/0.1/ClearKeyUtils.h
author Joel Maher <jmaher@mozilla.com>
Mon, 09 Oct 2017 11:10:33 -0400
changeset 432329 b92b69f3503e71ea7a7184f3f56526aafa57d999
parent 374926 fe0662dd0b839b00710eae1a7a4452625027a03a
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1243263 - Disable browser_notification_tab_switching.js for frequency failures. r=me, a=test-only

/*
 * Copyright 2015, Mozilla Foundation and contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __ClearKeyUtils_h__
#define __ClearKeyUtils_h__

#include <stdint.h>
#include <string>
#include <vector>
#include <assert.h>

// This include is required in order for content_decryption_module to work
// on Unix systems.
#include "stddef.h"
#include "content_decryption_module.h"

#if 0
void CK_Log(const char* aFmt, ...);
#define CK_LOGE(...) CK_Log(__VA_ARGS__)
#define CK_LOGD(...) CK_Log(__VA_ARGS__)
#define CK_LOGW(...) CK_Log(__VA_ARGS__)
#define CK_LOGARRAY(APREPEND, ADATA, ADATA_SIZE) CK_LogArray(APREPEND, \
  ADATA, \
  ADATA_SIZE)
#else
// Note: Enabling logging slows things down a LOT, especially when logging to
// a file.
#define CK_LOGE(...)
#define CK_LOGD(...)
#define CK_LOGW(...)
#define CK_LOGARRAY(APREPEND, ADATA, ADATA_SIZE)
#endif

typedef std::vector<uint8_t> KeyId;
typedef std::vector<uint8_t> Key;

// The session response size should be within a reasonable limit.
// The size 64 KB is referenced from web-platform-test.
static const uint32_t kMaxSessionResponseLength = 65536;

// Provide limitation for KeyIds length and webm initData size.
static const uint32_t kMaxWebmInitDataSize = 65536;
static const uint32_t kMaxKeyIdsLength = 512;

void CK_LogArray(const char* aPrepend,
                 const uint8_t* aData,
                 const uint32_t aDataSize);

struct KeyIdPair
{
  KeyId mKeyId;
  Key mKey;
};

class ClearKeyUtils
{
public:
  static void DecryptAES(const std::vector<uint8_t>& aKey,
                         std::vector<uint8_t>& aData, std::vector<uint8_t>& aIV);

  static bool ParseKeyIdsInitData(const uint8_t* aInitData,
                                  uint32_t aInitDataSize,
                                  std::vector<KeyId>& aOutKeyIds);

  static void MakeKeyRequest(const std::vector<KeyId>& aKeyIds,
                             std::string& aOutRequest,
                             cdm::SessionType aSessionType);

  static bool ParseJWK(const uint8_t* aKeyData, uint32_t aKeyDataSize,
                       std::vector<KeyIdPair>& aOutKeys,
                       cdm::SessionType aSessionType);
  static const char* SessionTypeToString(cdm::SessionType aSessionType);

  static bool IsValidSessionId(const char* aBuff, uint32_t aLength);

  static std::string ToHexString(const uint8_t * aBytes, uint32_t aLength);
};

template<class Container, class Element>
inline bool
Contains(const Container& aContainer, const Element& aElement)
{
  return aContainer.find(aElement) != aContainer.end();
}

template<typename T>
inline void
Assign(std::vector<T>& aVec, const T* aData, size_t aLength)
{
  aVec.assign(aData, aData + aLength);
}

#endif // __ClearKeyUtils_h__