1 /* 2 * Copyright (C) 2016 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 #define LOG_TAG "android.hardware.drm (at) 1.0-impl" 17 18 #include "CryptoPlugin.h" 19 #include "TypeConvert.h" 20 21 #include <android/hidl/memory/1.0/IMemory.h> 22 #include <hidlmemory/mapping.h> 23 #include <log/log.h> 24 #include <media/stagefright/foundation/AString.h> 25 26 using android::hardware::hidl_memory; 27 using android::hidl::memory::V1_0::IMemory; 28 29 namespace android { 30 namespace hardware { 31 namespace drm { 32 namespace V1_0 { 33 namespace implementation { 34 35 // Methods from ::android::hardware::drm::V1_0::ICryptoPlugin follow 36 Return<bool> CryptoPlugin::requiresSecureDecoderComponent( 37 const hidl_string& mime) { 38 return mLegacyPlugin->requiresSecureDecoderComponent(mime.c_str()); 39 } 40 41 Return<void> CryptoPlugin::notifyResolution(uint32_t width, 42 uint32_t height) { 43 mLegacyPlugin->notifyResolution(width, height); 44 return Void(); 45 } 46 47 Return<Status> CryptoPlugin::setMediaDrmSession( 48 const hidl_vec<uint8_t>& sessionId) { 49 return toStatus(mLegacyPlugin->setMediaDrmSession(toVector(sessionId))); 50 } 51 52 Return<void> CryptoPlugin::setSharedBufferBase(const hidl_memory& base, 53 uint32_t bufferId) { 54 sp<IMemory> hidlMemory = mapMemory(base); 55 ALOGE_IF(hidlMemory == nullptr, "mapMemory returns nullptr"); 56 57 // allow mapMemory to return nullptr 58 mSharedBufferMap[bufferId] = hidlMemory; 59 return Void(); 60 } 61 62 Return<void> CryptoPlugin::decrypt(bool secure, 63 const hidl_array<uint8_t, 16>& keyId, 64 const hidl_array<uint8_t, 16>& iv, Mode mode, 65 const Pattern& pattern, const hidl_vec<SubSample>& subSamples, 66 const SharedBuffer& source, uint64_t offset, 67 const DestinationBuffer& destination, 68 decrypt_cb _hidl_cb) { 69 70 if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) { 71 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set"); 72 return Void(); 73 } 74 75 if (destination.type == BufferType::SHARED_MEMORY) { 76 const SharedBuffer& dest = destination.nonsecureMemory; 77 if (mSharedBufferMap.find(dest.bufferId) == mSharedBufferMap.end()) { 78 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination decrypt buffer base not set"); 79 return Void(); 80 } 81 } 82 83 android::CryptoPlugin::Mode legacyMode; 84 switch(mode) { 85 case Mode::UNENCRYPTED: 86 legacyMode = android::CryptoPlugin::kMode_Unencrypted; 87 break; 88 case Mode::AES_CTR: 89 legacyMode = android::CryptoPlugin::kMode_AES_CTR; 90 break; 91 case Mode::AES_CBC_CTS: 92 legacyMode = android::CryptoPlugin::kMode_AES_WV; 93 break; 94 case Mode::AES_CBC: 95 legacyMode = android::CryptoPlugin::kMode_AES_CBC; 96 break; 97 } 98 android::CryptoPlugin::Pattern legacyPattern; 99 legacyPattern.mEncryptBlocks = pattern.encryptBlocks; 100 legacyPattern.mSkipBlocks = pattern.skipBlocks; 101 102 std::unique_ptr<android::CryptoPlugin::SubSample[]> legacySubSamples = 103 std::make_unique<android::CryptoPlugin::SubSample[]>(subSamples.size()); 104 105 for (size_t i = 0; i < subSamples.size(); i++) { 106 legacySubSamples[i].mNumBytesOfClearData 107 = subSamples[i].numBytesOfClearData; 108 legacySubSamples[i].mNumBytesOfEncryptedData 109 = subSamples[i].numBytesOfEncryptedData; 110 } 111 112 AString detailMessage; 113 sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId]; 114 if (sourceBase == nullptr) { 115 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source is a nullptr"); 116 return Void(); 117 } 118 119 if (source.offset + offset + source.size > sourceBase->getSize()) { 120 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 121 return Void(); 122 } 123 124 uint8_t *base = static_cast<uint8_t *> 125 (static_cast<void *>(sourceBase->getPointer())); 126 void *srcPtr = static_cast<void *>(base + source.offset + offset); 127 128 void *destPtr = NULL; 129 if (destination.type == BufferType::SHARED_MEMORY) { 130 const SharedBuffer& destBuffer = destination.nonsecureMemory; 131 sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId]; 132 if (destBase == nullptr) { 133 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination is a nullptr"); 134 return Void(); 135 } 136 137 if (destBuffer.offset + destBuffer.size > destBase->getSize()) { 138 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 139 return Void(); 140 } 141 destPtr = static_cast<void *>(base + destination.nonsecureMemory.offset); 142 } else if (destination.type == BufferType::NATIVE_HANDLE) { 143 native_handle_t *handle = const_cast<native_handle_t *>( 144 destination.secureMemory.getNativeHandle()); 145 destPtr = static_cast<void *>(handle); 146 } 147 ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(), 148 legacyMode, legacyPattern, srcPtr, legacySubSamples.get(), 149 subSamples.size(), destPtr, &detailMessage); 150 151 uint32_t status; 152 uint32_t bytesWritten; 153 154 if (result >= 0) { 155 status = android::OK; 156 bytesWritten = result; 157 } else { 158 status = result; 159 bytesWritten = 0; 160 } 161 162 _hidl_cb(toStatus(status), bytesWritten, detailMessage.c_str()); 163 return Void(); 164 } 165 166 } // namespace implementation 167 } // namespace V1_0 168 } // namespace drm 169 } // namespace hardware 170 } // namespace android 171
