drm/crypto/1.0/default/CryptoPlugin.cpp

/*
 * 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.
 */

#include "CryptoPlugin.h"
#include "TypeConvert.h"

#include <media/stagefright/foundation/AString.h>

#include <hidlmemory/mapping.h>
#include <android/hidl/memory/1.0/IMemory.h>
#include <utils/Log.h>

using android::hidl::memory::V1_0::IMemory;


namespace android {
namespace hardware {
namespace drm {
namespace crypto {
namespace V1_0 {
namespace implementation {

    // Methods from ::android::hardware::drm::crypto::V1_0::ICryptoPlugin follow
    Return<bool> CryptoPlugin::requiresSecureDecoderComponent(
            const hidl_string& mime) {
        return mLegacyPlugin->requiresSecureDecoderComponent(mime);
    }

    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::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 hidl_memory& source, uint32_t offset,
            const DestinationBuffer& destination,
            decrypt_cb _hidl_cb) {

        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;

        android::CryptoPlugin::SubSample *legacySubSamples =
            new 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> sharedSourceMemory = mapMemory(source);

        void *srcPtr = static_cast<void *>(sharedSourceMemory->getPointer());
        uint8_t *offsetSrc = static_cast<uint8_t *>(srcPtr) + offset;
        srcPtr = static_cast<void *>(offsetSrc);

        sp<IMemory> sharedDestinationMemory;
        void *destPtr = NULL;

        if (destination.type == BufferType::SHARED_MEMORY) {
            sharedDestinationMemory = mapMemory(destination.nonsecureMemory);
            sharedDestinationMemory->update();
            destPtr = sharedDestinationMemory->getPointer();
        } 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,
                subSamples.size(), destPtr, &detailMessage);

        if (destination.type == BufferType::SHARED_MEMORY) {
            sharedDestinationMemory->commit();
        }

        delete[] legacySubSamples;

        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 crypto
}  // namespace drm
}  // namespace hardware
}  // namespace android