1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef CRYPTO_HAL_H_
18 
19 #define CRYPTO_HAL_H_
20 
21 #include <android/hardware/drm/1.0/ICryptoFactory.h>
22 #include <android/hardware/drm/1.0/ICryptoPlugin.h>
23 #include <android/hardware/drm/1.1/ICryptoFactory.h>
24 
25 #include <mediadrm/ICrypto.h>
26 #include <utils/KeyedVector.h>
27 #include <utils/threads.h>
28 
29 namespace drm = ::android::hardware::drm;
30 using drm::V1_0::ICryptoFactory;
31 using drm::V1_0::ICryptoPlugin;
32 using drm::V1_0::SharedBuffer;
33 
34 class IMemoryHeap;
35 
36 namespace android {
37 
38 struct CryptoHal : public BnCrypto {
39     CryptoHal();
40     virtual ~CryptoHal();
41 
42     virtual status_t initCheck() const;
43 
44     virtual bool isCryptoSchemeSupported(const uint8_t uuid[16]);
45 
46     virtual status_t createPlugin(
47             const uint8_t uuid[16], const void *data, size_t size);
48 
49     virtual status_t destroyPlugin();
50 
51     virtual bool requiresSecureDecoderComponent(
52             const char *mime) const;
53 
54     virtual void notifyResolution(uint32_t width, uint32_t height);
55 
56     virtual status_t setMediaDrmSession(const Vector<uint8_t> &sessionId);
57 
58     virtual ssize_t decrypt(const uint8_t key[16], const uint8_t iv[16],
59             CryptoPlugin::Mode mode, const CryptoPlugin::Pattern &pattern,
60             const ICrypto::SourceBuffer &source, size_t offset,
61             const CryptoPlugin::SubSample *subSamples, size_t numSubSamples,
62             const ICrypto::DestinationBuffer &destination,
63             AString *errorDetailMsg);
64 
setHeapCryptoHal65     virtual int32_t setHeap(const sp<IMemoryHeap>& heap) {
66         return setHeapBase(heap);
67     }
unsetHeapCryptoHal68     virtual void unsetHeap(int32_t seqNum) { clearHeapBase(seqNum); }
69 
70 private:
71     mutable Mutex mLock;
72 
73     const Vector<sp<ICryptoFactory>> mFactories;
74     sp<ICryptoPlugin> mPlugin;
75 
76     /**
77      * mInitCheck is:
78      *   NO_INIT if a plugin hasn't been created yet
79      *   ERROR_UNSUPPORTED if a plugin can't be created for the uuid
80      *   OK after a plugin has been created and mPlugin is valid
81      */
82     status_t mInitCheck;
83 
84     struct HeapBase {
HeapBaseCryptoHal::HeapBase85         HeapBase() : mBufferId(0), mSize(0) {}
HeapBaseCryptoHal::HeapBase86         HeapBase(uint32_t bufferId, size_t size) :
87             mBufferId(bufferId), mSize(size) {}
88 
getBufferIdCryptoHal::HeapBase89         uint32_t getBufferId() const {return mBufferId;}
getSizeCryptoHal::HeapBase90         size_t getSize() const {return mSize;}
91 
92     private:
93         uint32_t mBufferId;
94         size_t mSize;
95     };
96 
97     KeyedVector<int32_t, HeapBase> mHeapBases;
98     uint32_t mNextBufferId;
99     int32_t mHeapSeqNum;
100 
101     Vector<sp<ICryptoFactory>> makeCryptoFactories();
102     sp<ICryptoPlugin> makeCryptoPlugin(const sp<ICryptoFactory>& factory,
103             const uint8_t uuid[16], const void *initData, size_t size);
104 
105     int32_t setHeapBase(const sp<IMemoryHeap>& heap);
106     void clearHeapBase(int32_t seqNum);
107 
108     status_t toSharedBuffer(const sp<IMemory>& memory, int32_t seqNum, ::SharedBuffer* buffer);
109 
110     DISALLOW_EVIL_CONSTRUCTORS(CryptoHal);
111 };
112 
113 }  // namespace android
114 
115 #endif  // CRYPTO_HAL_H_
116