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@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 requiresSecureDecoderComponent(const hidl_string & mime)36 Return<bool> CryptoPlugin::requiresSecureDecoderComponent( 37 const hidl_string& mime) { 38 return mLegacyPlugin->requiresSecureDecoderComponent(mime.c_str()); 39 } 40 notifyResolution(uint32_t width,uint32_t height)41 Return<void> CryptoPlugin::notifyResolution(uint32_t width, 42 uint32_t height) { 43 mLegacyPlugin->notifyResolution(width, height); 44 return Void(); 45 } 46 setMediaDrmSession(const hidl_vec<uint8_t> & sessionId)47 Return<Status> CryptoPlugin::setMediaDrmSession( 48 const hidl_vec<uint8_t>& sessionId) { 49 return toStatus(mLegacyPlugin->setMediaDrmSession(toVector(sessionId))); 50 } 51 setSharedBufferBase(const hidl_memory & base,uint32_t bufferId)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 decrypt(bool secure,const hidl_array<uint8_t,16> & keyId,const hidl_array<uint8_t,16> & iv,Mode mode,const Pattern & pattern,const hidl_vec<SubSample> & subSamples,const SharedBuffer & source,uint64_t offset,const DestinationBuffer & destination,decrypt_cb _hidl_cb)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 size_t destSize = 0; 105 for (size_t i = 0; i < subSamples.size(); i++) { 106 uint32_t numBytesOfClearData = subSamples[i].numBytesOfClearData; 107 legacySubSamples[i].mNumBytesOfClearData = numBytesOfClearData; 108 uint32_t numBytesOfEncryptedData = subSamples[i].numBytesOfEncryptedData; 109 legacySubSamples[i].mNumBytesOfEncryptedData = numBytesOfEncryptedData; 110 if (__builtin_add_overflow(destSize, numBytesOfClearData, &destSize)) { 111 _hidl_cb(Status::BAD_VALUE, 0, "subsample clear size overflow"); 112 return Void(); 113 } 114 if (__builtin_add_overflow(destSize, numBytesOfEncryptedData, &destSize)) { 115 _hidl_cb(Status::BAD_VALUE, 0, "subsample encrypted size overflow"); 116 return Void(); 117 } 118 } 119 120 AString detailMessage; 121 sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId]; 122 if (sourceBase == nullptr) { 123 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source is a nullptr"); 124 return Void(); 125 } 126 127 if (source.offset + offset + source.size > sourceBase->getSize()) { 128 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 129 return Void(); 130 } 131 132 uint8_t *base = static_cast<uint8_t *> 133 (static_cast<void *>(sourceBase->getPointer())); 134 void *srcPtr = static_cast<void *>(base + source.offset + offset); 135 136 void *destPtr = NULL; 137 if (destination.type == BufferType::SHARED_MEMORY) { 138 const SharedBuffer& destBuffer = destination.nonsecureMemory; 139 sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId]; 140 if (destBase == nullptr) { 141 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination is a nullptr"); 142 return Void(); 143 } 144 145 if (destBuffer.offset + destBuffer.size > destBase->getSize()) { 146 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 147 return Void(); 148 } 149 150 if (destSize > destBuffer.size) { 151 _hidl_cb(Status::BAD_VALUE, 0, "subsample sum too large"); 152 return Void(); 153 } 154 155 base = static_cast<uint8_t *>(static_cast<void *>(destBase->getPointer())); 156 destPtr = static_cast<void *>(base + destination.nonsecureMemory.offset); 157 } else if (destination.type == BufferType::NATIVE_HANDLE) { 158 if (!secure) { 159 _hidl_cb(Status::BAD_VALUE, 0, "native handle destination must be secure"); 160 return Void(); 161 } 162 native_handle_t *handle = const_cast<native_handle_t *>( 163 destination.secureMemory.getNativeHandle()); 164 destPtr = static_cast<void *>(handle); 165 } else { 166 _hidl_cb(Status::BAD_VALUE, 0, "invalid destination type"); 167 return Void(); 168 } 169 ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(), 170 legacyMode, legacyPattern, srcPtr, legacySubSamples.get(), 171 subSamples.size(), destPtr, &detailMessage); 172 173 uint32_t status; 174 uint32_t bytesWritten; 175 176 if (result >= 0) { 177 status = android::OK; 178 bytesWritten = result; 179 } else { 180 status = result; 181 bytesWritten = 0; 182 } 183 184 _hidl_cb(toStatus(status), bytesWritten, detailMessage.c_str()); 185 return Void(); 186 } 187 188 } // namespace implementation 189 } // namespace V1_0 190 } // namespace drm 191 } // namespace hardware 192 } // namespace android 193