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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 <assert.h>
// stdef.h is required for content_decryption_module to work on Unix systems.
#include <stddef.h>
#include <stdint.h>
#include <string>
#include <vector>
#include "content_decryption_module.h"
#include "pk11pub.h"
#include "mozilla/Span.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 bool DecryptCbcs(const std::vector<uint8_t>& aKey,
const std::vector<uint8_t>& aIV,
mozilla::Span<uint8_t> aSubsampleEncryptedRange,
uint32_t aCryptByteBlocks, uint32_t aSkipByteBlocks);
static bool 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__
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