102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
/*
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* Copyright 2015, Mozilla Foundation and contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __ClearKeyDecryptionManager_h__
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#define __ClearKeyDecryptionManager_h__
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#include <map>
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#include "ClearKeyUtils.h"
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#include "RefCounted.h"
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class ClearKeyDecryptor;
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class CryptoMetaData {
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public:
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CryptoMetaData() {}
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explicit CryptoMetaData(const GMPEncryptedBufferMetadata* aCrypto)
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{
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Init(aCrypto);
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}
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void Init(const GMPEncryptedBufferMetadata* aCrypto)
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{
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if (!aCrypto) {
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assert(!IsValid());
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return;
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}
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Assign(mKeyId, aCrypto->KeyId(), aCrypto->KeyIdSize());
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Assign(mIV, aCrypto->IV(), aCrypto->IVSize());
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Assign(mClearBytes, aCrypto->ClearBytes(), aCrypto->NumSubsamples());
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Assign(mCipherBytes, aCrypto->CipherBytes(), aCrypto->NumSubsamples());
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}
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bool IsValid() const {
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return !mKeyId.empty() &&
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!mIV.empty() &&
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!mCipherBytes.empty() &&
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!mClearBytes.empty();
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}
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size_t NumSubsamples() const {
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assert(mClearBytes.size() == mCipherBytes.size());
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return mClearBytes.size();
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}
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std::vector<uint8_t> mKeyId;
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std::vector<uint8_t> mIV;
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std::vector<uint16_t> mClearBytes;
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std::vector<uint32_t> mCipherBytes;
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};
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class ClearKeyDecryptionManager : public RefCounted
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{
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private:
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ClearKeyDecryptionManager();
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~ClearKeyDecryptionManager();
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static ClearKeyDecryptionManager* sInstance;
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public:
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static ClearKeyDecryptionManager* Get();
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bool HasSeenKeyId(const KeyId& aKeyId) const;
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bool HasKeyForKeyId(const KeyId& aKeyId) const;
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const Key& GetDecryptionKey(const KeyId& aKeyId);
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// Create a decryptor for the given KeyId if one does not already exist.
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void InitKey(KeyId aKeyId, Key aKey);
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void ExpectKeyId(KeyId aKeyId);
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void ReleaseKeyId(KeyId aKeyId);
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// Decrypts buffer *in place*.
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GMPErr Decrypt(uint8_t* aBuffer, uint32_t aBufferSize,
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const CryptoMetaData& aMetadata);
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GMPErr Decrypt(std::vector<uint8_t>& aBuffer,
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const CryptoMetaData& aMetadata);
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void Shutdown();
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private:
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bool IsExpectingKeyForKeyId(const KeyId& aKeyId) const;
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std::map<KeyId, ClearKeyDecryptor*> mDecryptors;
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};
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#endif // __ClearKeyDecryptionManager_h__
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