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 mSharedBufferMap[bufferId] = mapMemory(base); 55 return Void(); 56 } 57 58 Return<void> CryptoPlugin::decrypt(bool secure, 59 const hidl_array<uint8_t, 16>& keyId, 60 const hidl_array<uint8_t, 16>& iv, Mode mode, 61 const Pattern& pattern, const hidl_vec<SubSample>& subSamples, 62 const SharedBuffer& source, uint64_t offset, 63 const DestinationBuffer& destination, 64 decrypt_cb _hidl_cb) { 65 66 if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) { 67 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set"); 68 return Void(); 69 } 70 71 if (destination.type == BufferType::SHARED_MEMORY) { 72 const SharedBuffer& dest = destination.nonsecureMemory; 73 if (mSharedBufferMap.find(dest.bufferId) == mSharedBufferMap.end()) { 74 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination decrypt buffer base not set"); 75 return Void(); 76 } 77 } 78 79 android::CryptoPlugin::Mode legacyMode; 80 switch(mode) { 81 case Mode::UNENCRYPTED: 82 legacyMode = android::CryptoPlugin::kMode_Unencrypted; 83 break; 84 case Mode::AES_CTR: 85 legacyMode = android::CryptoPlugin::kMode_AES_CTR; 86 break; 87 case Mode::AES_CBC_CTS: 88 legacyMode = android::CryptoPlugin::kMode_AES_WV; 89 break; 90 case Mode::AES_CBC: 91 legacyMode = android::CryptoPlugin::kMode_AES_CBC; 92 break; 93 } 94 android::CryptoPlugin::Pattern legacyPattern; 95 legacyPattern.mEncryptBlocks = pattern.encryptBlocks; 96 legacyPattern.mSkipBlocks = pattern.skipBlocks; 97 98 android::CryptoPlugin::SubSample *legacySubSamples = 99 new android::CryptoPlugin::SubSample[subSamples.size()]; 100 101 for (size_t i = 0; i < subSamples.size(); i++) { 102 legacySubSamples[i].mNumBytesOfClearData 103 = subSamples[i].numBytesOfClearData; 104 legacySubSamples[i].mNumBytesOfEncryptedData 105 = subSamples[i].numBytesOfEncryptedData; 106 } 107 108 AString detailMessage; 109 sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId]; 110 111 if (source.offset + offset + source.size > sourceBase->getSize()) { 112 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 113 return Void(); 114 } 115 116 uint8_t *base = static_cast<uint8_t *> 117 (static_cast<void *>(sourceBase->getPointer())); 118 void *srcPtr = static_cast<void *>(base + source.offset + offset); 119 120 void *destPtr = NULL; 121 if (destination.type == BufferType::SHARED_MEMORY) { 122 const SharedBuffer& destBuffer = destination.nonsecureMemory; 123 sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId]; 124 if (destBuffer.offset + destBuffer.size > destBase->getSize()) { 125 _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size"); 126 return Void(); 127 } 128 destPtr = static_cast<void *>(base + destination.nonsecureMemory.offset); 129 } else if (destination.type == BufferType::NATIVE_HANDLE) { 130 native_handle_t *handle = const_cast<native_handle_t *>( 131 destination.secureMemory.getNativeHandle()); 132 destPtr = static_cast<void *>(handle); 133 } 134 ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(), 135 legacyMode, legacyPattern, srcPtr, legacySubSamples, 136 subSamples.size(), destPtr, &detailMessage); 137 138 delete[] legacySubSamples; 139 140 uint32_t status; 141 uint32_t bytesWritten; 142 143 if (result >= 0) { 144 status = android::OK; 145 bytesWritten = result; 146 } else { 147 status = result; 148 bytesWritten = 0; 149 } 150 151 _hidl_cb(toStatus(status), bytesWritten, detailMessage.c_str()); 152 return Void(); 153 } 154 155 } // namespace implementation 156 } // namespace V1_0 157 } // namespace drm 158 } // namespace hardware 159 } // namespace android 160
