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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "android.hardware.drm@1.0-impl"
#include "CryptoPlugin.h"
#include "TypeConvert.h"
#include <android/hidl/memory/1.0/IMemory.h>
#include <hidlmemory/mapping.h>
#include <log/log.h>
#include <media/stagefright/foundation/AString.h>
using android::hardware::hidl_memory;
using android::hidl::memory::V1_0::IMemory;
namespace android {
namespace hardware {
namespace drm {
namespace V1_0 {
namespace implementation {
// Methods from ::android::hardware::drm::V1_0::ICryptoPlugin follow
Return<bool> CryptoPlugin::requiresSecureDecoderComponent(
const hidl_string& mime) {
return mLegacyPlugin->requiresSecureDecoderComponent(mime.c_str());
}
Return<void> CryptoPlugin::notifyResolution(uint32_t width,
uint32_t height) {
mLegacyPlugin->notifyResolution(width, height);
return Void();
}
Return<Status> CryptoPlugin::setMediaDrmSession(
const hidl_vec<uint8_t>& sessionId) {
return toStatus(mLegacyPlugin->setMediaDrmSession(toVector(sessionId)));
}
Return<void> CryptoPlugin::setSharedBufferBase(const hidl_memory& base,
uint32_t bufferId) {
sp<IMemory> hidlMemory = mapMemory(base);
ALOGE_IF(hidlMemory == nullptr, "mapMemory returns nullptr");
// allow mapMemory to return nullptr
mSharedBufferMap[bufferId] = hidlMemory;
return Void();
}
Return<void> CryptoPlugin::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) {
if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set");
return Void();
}
if (destination.type == BufferType::SHARED_MEMORY) {
const SharedBuffer& dest = destination.nonsecureMemory;
if (mSharedBufferMap.find(dest.bufferId) == mSharedBufferMap.end()) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination decrypt buffer base not set");
return Void();
}
}
android::CryptoPlugin::Mode legacyMode;
switch(mode) {
case Mode::UNENCRYPTED:
legacyMode = android::CryptoPlugin::kMode_Unencrypted;
break;
case Mode::AES_CTR:
legacyMode = android::CryptoPlugin::kMode_AES_CTR;
break;
case Mode::AES_CBC_CTS:
legacyMode = android::CryptoPlugin::kMode_AES_WV;
break;
case Mode::AES_CBC:
legacyMode = android::CryptoPlugin::kMode_AES_CBC;
break;
}
android::CryptoPlugin::Pattern legacyPattern;
legacyPattern.mEncryptBlocks = pattern.encryptBlocks;
legacyPattern.mSkipBlocks = pattern.skipBlocks;
std::unique_ptr<android::CryptoPlugin::SubSample[]> legacySubSamples =
std::make_unique<android::CryptoPlugin::SubSample[]>(subSamples.size());
for (size_t i = 0; i < subSamples.size(); i++) {
legacySubSamples[i].mNumBytesOfClearData
= subSamples[i].numBytesOfClearData;
legacySubSamples[i].mNumBytesOfEncryptedData
= subSamples[i].numBytesOfEncryptedData;
}
AString detailMessage;
sp<IMemory> sourceBase = mSharedBufferMap[source.bufferId];
if (sourceBase == nullptr) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source is a nullptr");
return Void();
}
if (source.offset + offset + source.size > sourceBase->getSize()) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size");
return Void();
}
uint8_t *base = static_cast<uint8_t *>
(static_cast<void *>(sourceBase->getPointer()));
void *srcPtr = static_cast<void *>(base + source.offset + offset);
void *destPtr = NULL;
if (destination.type == BufferType::SHARED_MEMORY) {
const SharedBuffer& destBuffer = destination.nonsecureMemory;
sp<IMemory> destBase = mSharedBufferMap[destBuffer.bufferId];
if (destBase == nullptr) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "destination is a nullptr");
return Void();
}
if (destBuffer.offset + destBuffer.size > destBase->getSize()) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "invalid buffer size");
return Void();
}
destPtr = static_cast<void *>(base + destination.nonsecureMemory.offset);
} else if (destination.type == BufferType::NATIVE_HANDLE) {
native_handle_t *handle = const_cast<native_handle_t *>(
destination.secureMemory.getNativeHandle());
destPtr = static_cast<void *>(handle);
}
ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(),
legacyMode, legacyPattern, srcPtr, legacySubSamples.get(),
subSamples.size(), destPtr, &detailMessage);
uint32_t status;
uint32_t bytesWritten;
if (result >= 0) {
status = android::OK;
bytesWritten = result;
} else {
status = result;
bytesWritten = 0;
}
_hidl_cb(toStatus(status), bytesWritten, detailMessage.c_str());
return Void();
}
} // namespace implementation
} // namespace V1_0
} // namespace drm
} // namespace hardware
} // namespace android
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