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/*
* 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>
#include "gmp-api/gmp-decryption.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__)
#else
#define CK_LOGE(...)
#define CK_LOGD(...)
#define CK_LOGW(...)
#endif
struct GMPPlatformAPI;
extern GMPPlatformAPI* GetPlatform();
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;
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,
GMPSessionType aSessionType);
static bool ParseJWK(const uint8_t* aKeyData, uint32_t aKeyDataSize,
std::vector<KeyIdPair>& aOutKeys,
GMPSessionType aSessionType);
static const char* SessionTypeToString(GMPSessionType aSessionType);
static bool IsValidSessionId(const char* aBuff, uint32_t aLength);
};
template<class Container, class Element>
inline bool
Contains(const Container& aContainer, const Element& aElement)
{
return aContainer.find(aElement) != aContainer.end();
}
class AutoLock {
public:
explicit AutoLock(GMPMutex* aMutex)
: mMutex(aMutex)
{
assert(aMutex);
if (mMutex) {
mMutex->Acquire();
}
}
~AutoLock() {
if (mMutex) {
mMutex->Release();
}
}
private:
GMPMutex* mMutex;
};
GMPMutex* GMPCreateMutex();
template<typename T>
inline void
Assign(std::vector<T>& aVec, const T* aData, size_t aLength)
{
aVec.assign(aData, aData + aLength);
}
#endif // __ClearKeyUtils_h__
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