1 /*
2 * Copyright (C) 2018 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 //#define LOG_NDEBUG 0
18 #define LOG_TAG "hidl_ClearKeySession"
19 #include <utils/Log.h>
20
21 #include "Session.h"
22 #include "Utils.h"
23
24 #include "AesCtrDecryptor.h"
25 #include "InitDataParser.h"
26 #include "JsonWebKey.h"
27
28 namespace android {
29 namespace hardware {
30 namespace drm {
31 namespace V1_1 {
32 namespace clearkey {
33
34 using ::android::hardware::drm::V1_0::KeyValue;
35 using ::android::hardware::drm::V1_0::Status;
36 using ::android::hardware::drm::V1_0::SubSample;
37 using ::android::hardware::Return;
38 using ::android::sp;
39
40 using android::Mutex;
41
getKeyRequest(const std::vector<uint8_t> & initData,const std::string & mimeType,std::vector<uint8_t> * keyRequest) const42 Status Session::getKeyRequest(
43 const std::vector<uint8_t>& initData,
44 const std::string& mimeType,
45 std::vector<uint8_t>* keyRequest) const {
46 InitDataParser parser;
47 return parser.parse(initData, mimeType, keyRequest);
48 }
49
provideKeyResponse(const std::vector<uint8_t> & response)50 Status Session::provideKeyResponse(const std::vector<uint8_t>& response) {
51 std::string responseString(
52 reinterpret_cast<const char*>(response.data()), response.size());
53 KeyMap keys;
54
55 Mutex::Autolock lock(mMapLock);
56 JsonWebKey parser;
57 if (parser.extractKeysFromJsonWebKeySet(responseString, &keys)) {
58 for (auto &key : keys) {
59 std::string first(key.first.begin(), key.first.end());
60 std::string second(key.second.begin(), key.second.end());
61 mKeyMap.insert(std::pair<std::vector<uint8_t>,
62 std::vector<uint8_t> >(key.first, key.second));
63 }
64 return Status::OK;
65 } else {
66 return Status::ERROR_DRM_UNKNOWN;
67 }
68 }
69
decrypt(const KeyId keyId,const Iv iv,const uint8_t * srcPtr,uint8_t * destPtr,const std::vector<SubSample> subSamples,size_t * bytesDecryptedOut)70 Status Session::decrypt(
71 const KeyId keyId, const Iv iv, const uint8_t* srcPtr,
72 uint8_t* destPtr, const std::vector<SubSample> subSamples,
73 size_t* bytesDecryptedOut) {
74 Mutex::Autolock lock(mMapLock);
75
76 std::vector<uint8_t> keyIdVector;
77 keyIdVector.clear();
78 keyIdVector.insert(keyIdVector.end(), keyId, keyId + kBlockSize);
79 std::map<std::vector<uint8_t>, std::vector<uint8_t> >::iterator itr;
80 itr = mKeyMap.find(keyIdVector);
81 if (itr == mKeyMap.end()) {
82 return Status::ERROR_DRM_NO_LICENSE;
83 }
84
85 AesCtrDecryptor decryptor;
86 return decryptor.decrypt(
87 itr->second /*key*/, iv, srcPtr, destPtr, subSamples,
88 subSamples.size(), bytesDecryptedOut);
89 }
90
91 } // namespace clearkey
92 } // namespace V1_1
93 } // namespace drm
94 } // namespace hardware
95 } // namespace android
96