Convert clearkey plugin to HIDL

Create clearkey HIDL service to support new APIs for drm 1.1 HAL.
The directories are organized into common, default and hidl.
The old shared library source is in common and default.
The new clearkey service source is in common and hidl.

Test: VtsHalDrmV1_1TargetTest

bug: 69635855
Change-Id: I2e8e0e1a39b622aa274ecd32c873d81b95bdc4f8

1 files changed, 185 insertions, 0 deletions

diff --git a/drm/mediadrm/plugins/clearkey/hidl/CryptoPlugin.cpp b/drm/mediadrm/plugins/clearkey/hidl/CryptoPlugin.cpp
new file mode 100644
index 0000000000..f33f94e711
--- /dev/null
+++ b/drm/mediadrm/plugins/clearkey/hidl/CryptoPlugin.cpp
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2018 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_NDEBUG 0
+#define LOG_TAG "hidl_ClearKeyCryptoPlugin"
+#include <utils/Log.h>
+
+#include "CryptoPlugin.h"
+#include "SessionLibrary.h"
+#include "TypeConvert.h"
+
+#include <hidlmemory/mapping.h>
+
+namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_1 {
+namespace clearkey {
+
+using ::android::hardware::drm::V1_0::BufferType;
+
+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();
+}
+
+// Returns negative values for error code and positive values for the size of
+// decrypted data.  In theory, the output size can be larger than the input
+// size, but in practice this will never happen for AES-CTR.
+Return<void> CryptoPlugin::decrypt(
+        bool secure,
+        const hidl_array<uint8_t, KEY_ID_SIZE>& keyId,
+        const hidl_array<uint8_t, KEY_IV_SIZE>& iv,
+        Mode mode,
+        const Pattern& pattern,
+        const hidl_vec<SubSample>& subSamples,
+        const SharedBuffer& source,
+        uint64_t offset,
+        const DestinationBuffer& destination,
+        decrypt_cb _hidl_cb) {
+    UNUSED(pattern);
+
+    if (secure) {
+        _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0,
+            "Secure decryption is not supported with ClearKey.");
+        return Void();
+    }
+
+    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();
+      }
+    }
+
+    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()));
+    uint8_t* srcPtr = static_cast<uint8_t *>(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);
+    }
+
+    // Calculate the output buffer size and determine if any subsamples are
+    // encrypted.
+    size_t destSize = 0;
+    bool haveEncryptedSubsamples = false;
+    for (size_t i = 0; i < subSamples.size(); i++) {
+        const SubSample &subSample = subSamples[i];
+        destSize += subSample.numBytesOfClearData;
+        destSize += subSample.numBytesOfEncryptedData;
+        if (subSample.numBytesOfEncryptedData > 0) {
+        haveEncryptedSubsamples = true;
+        }
+    }
+
+    if (mode == Mode::UNENCRYPTED) {
+        if (haveEncryptedSubsamples) {
+            _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0,
+                    "Encrypted subsamples found in allegedly unencrypted data.");
+            return Void();
+        }
+
+        size_t offset = 0;
+        for (size_t i = 0; i < subSamples.size(); ++i) {
+            const SubSample& subSample = subSamples[i];
+            if (subSample.numBytesOfClearData != 0) {
+                memcpy(reinterpret_cast<uint8_t*>(destPtr) + offset,
+                       reinterpret_cast<const uint8_t*>(srcPtr) + offset,
+                       subSample.numBytesOfClearData);
+                offset += subSample.numBytesOfClearData;
+            }
+        }
+
+        _hidl_cb(Status::OK, static_cast<ssize_t>(offset), "");
+        return Void();
+    } else if (mode == Mode::AES_CTR) {
+        size_t bytesDecrypted;
+        Status res = mSession->decrypt(keyId.data(), iv.data(), srcPtr,
+                static_cast<uint8_t*>(destPtr), toVector(subSamples), &bytesDecrypted);
+        if (res == Status::OK) {
+            _hidl_cb(Status::OK, static_cast<ssize_t>(bytesDecrypted), "");
+            return Void();
+        } else {
+            _hidl_cb(Status::ERROR_DRM_DECRYPT, static_cast<ssize_t>(res),
+                    "Decryption Error");
+            return Void();
+        }
+    } else {
+        _hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0,
+                "Selected encryption mode is not supported by the ClearKey DRM Plugin.");
+        return Void();
+    }
+}
+
+Return<Status> CryptoPlugin::setMediaDrmSession(
+        const hidl_vec<uint8_t>& sessionId) {
+    if (!sessionId.size()) {
+        mSession = nullptr;
+    } else {
+        mSession = SessionLibrary::get()->findSession(sessionId);
+        if (!mSession.get()) {
+            return Status::ERROR_DRM_SESSION_NOT_OPENED;
+        }
+    }
+    return Status::OK;
+}
+
+} // namespace clearkey
+} // namespace V1_1
+} // namespace drm
+} // namespace hardware
+} // namespace android