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 56 // allow mapMemory to return nullptr 57 mSharedBufferMap[bufferId] = hidlMemory; 58 return Void(); 59 } 60 61 Return<void> CryptoPlugin::decrypt(bool secure, 62 const hidl_array<uint8_t, 16>& keyId, 63 const hidl_array<uint8_t, 16>& iv, Mode mode, 64 const Pattern& pattern, const hidl_vec<SubSample>& subSamples, 65 const SharedBuffer& source, uint64_t offset, 66 const DestinationBuffer& destination, 67 decrypt_cb _hidl_cb) { 68 69 if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) { 70 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set"); 71 return Void(); 72 } 73 74 if (destination.type == BufferType::SHARED_MEMORY) { 75 const SharedBuffer& dest = destination.nonsecureMemory; 76 if (mSharedBufferMap.find(dest.bufferId) == mSharedBufferMap.end()) { 77 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination decrypt buffer base not set"); 78 return Void(); 79 } 80 } 81 82 android::CryptoPlugin::Mode legacyMode; 83 switch(mode) { 84 case Mode::UNENCRYPTED: 85 legacyMode = android::CryptoPlugin::kMode_Unencrypted; 86 break; 87 case Mode::AES_CTR: 88 legacyMode = android::CryptoPlugin::kMode_AES_CTR; 89 break; 90 case Mode::AES_CBC_CTS: 91 legacyMode = android::CryptoPlugin::kMode_AES_WV; 92 break; 93 case Mode::AES_CBC: 94 legacyMode = android::CryptoPlugin::kMode_AES_CBC; 95 break; 96 } 97 android::CryptoPlugin::Pattern legacyPattern; 98 legacyPattern.mEncryptBlocks = pattern.encryptBlocks; 99 legacyPattern.mSkipBlocks = pattern.skipBlocks; 100 101 std::unique_ptr<android::CryptoPlugin::SubSample[]> legacySubSamples = 102 std::make_unique<android::CryptoPlugin::SubSample[]>(subSamples.size()); 103 104 for (size_t i = 0; i < subSamples.size(); i++) { 105 legacySubSamples[i].mNumBytesOfClearData 106 = subSamples[i].numBytesOfClearData; 107 legacySubSamples[i].mNumBytesOfEncryptedData 108 = subSamples[i].numBytesOfEncryptedData; 109 } 110 111 AString detailMessage; 112 sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId]; 113 if (sourceBase == nullptr) { 114 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source is a nullptr"); 115 return Void(); 116 } 117 118 if (source.offset + offset + source.size > sourceBase->getSize()) { 119 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 120 return Void(); 121 } 122 123 uint8_t *base = static_cast<uint8_t *> 124 (static_cast<void *>(sourceBase->getPointer())); 125 void *srcPtr = static_cast<void *>(base + source.offset + offset); 126 127 void *destPtr = NULL; 128 if (destination.type == BufferType::SHARED_MEMORY) { 129 const SharedBuffer& destBuffer = destination.nonsecureMemory; 130 sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId]; 131 if (destBase == nullptr) { 132 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination is a nullptr"); 133 return Void(); 134 } 135 136 if (destBuffer.offset + destBuffer.size > destBase->getSize()) { 137 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 138 return Void(); 139 } 140 destPtr = static_cast<void *>(base + destination.nonsecureMemory.offset); 141 } else if (destination.type == BufferType::NATIVE_HANDLE) { 142 native_handle_t *handle = const_cast<native_handle_t *>( 143 destination.secureMemory.getNativeHandle()); 144 destPtr = static_cast<void *>(handle); 145 } 146 ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(), 147 legacyMode, legacyPattern, srcPtr, legacySubSamples.get(), 148 subSamples.size(), destPtr, &detailMessage); 149 150 uint32_t status; 151 uint32_t bytesWritten; 152 153 if (result >= 0) { 154 status = android::OK; 155 bytesWritten = result; 156 } else { 157 status = result; 158 bytesWritten = 0; 159 } 160 161 _hidl_cb(toStatus(status), bytesWritten, detailMessage.c_str()); 162 return Void(); 163 } 164 165 } // namespace implementation 166 } // namespace V1_0 167 } // namespace drm 168 } // namespace hardware 169 } // namespace android 170
