1 files changed, 85 insertions, 0 deletions
diff --git a/drm/mediadrm/plugins/clearkey/Session.cpp b/drm/mediadrm/plugins/clearkey/Session.cpp
new file mode 100644
index 0000000..95016f5
--- /dev/null
+++ b/drm/mediadrm/plugins/clearkey/Session.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2014 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 "ClearKeyCryptoPlugin"
+#include <utils/Log.h>
+
+#include <media/stagefright/MediaErrors.h>
+#include <utils/String8.h>
+
+#include "Session.h"
+
+#include "AesCtrDecryptor.h"
+#include "InitDataParser.h"
+#include "JsonWebKey.h"
+
+namespace clearkeydrm {
+
+using android::Mutex;
+using android::String8;
+using android::Vector;
+using android::status_t;
+
+status_t Session::getKeyRequest(
+        const Vector<uint8_t>& initData,
+        const String8& initDataType,
+        Vector<uint8_t>* keyRequest) const {
+    InitDataParser parser;
+    return parser.parse(initData, initDataType, keyRequest);
+}
+
+status_t Session::provideKeyResponse(const Vector<uint8_t>& response) {
+    String8 responseString(
+            reinterpret_cast<const char*>(response.array()), response.size());
+    KeyMap keys;
+
+    Mutex::Autolock lock(mMapLock);
+    JsonWebKey parser;
+    if (parser.extractKeysFromJsonWebKeySet(responseString, &keys)) {
+        for (size_t i = 0; i < keys.size(); ++i) {
+            const KeyMap::key_type& keyId = keys.keyAt(i);
+            const KeyMap::value_type& key = keys.valueAt(i);
+            mKeyMap.add(keyId, key);
+        }
+        return android::OK;
+    } else {
+        return android::ERROR_DRM_UNKNOWN;
+    }
+}
+
+status_t Session::decrypt(
+        const KeyId keyId, const Iv iv, const void* source,
+        void* destination, const SubSample* subSamples,
+        size_t numSubSamples, size_t* bytesDecryptedOut) {
+    Mutex::Autolock lock(mMapLock);
+
+    Vector<uint8_t> keyIdVector;
+    keyIdVector.appendArray(keyId, kBlockSize);
+    if (mKeyMap.indexOfKey(keyIdVector) < 0) {
+        return android::ERROR_DRM_NO_LICENSE;
+    }
+
+    const Vector<uint8_t>& key = mKeyMap.valueFor(keyIdVector);
+    AesCtrDecryptor decryptor;
+    return decryptor.decrypt(
+            key, iv,
+            reinterpret_cast<const uint8_t*>(source),
+            reinterpret_cast<uint8_t*>(destination), subSamples,
+            numSubSamples, bytesDecryptedOut);
+}
+
+} // namespace clearkeydrm