Initial import of Widevine Common Encryption DRM engine

Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.

Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c

libwvdrmengine/level3/arm/wv_keybox.h

@@ -0,0 +1,24 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+
+#ifndef WV_KEYBOX_H_
+#define WV_KEYBOX_H_
+
+namespace wvoec_obfs {
+
+// This is the format of a Widevine keybox.
+typedef struct {   // 128 bytes total.
+  // C character string identifying the device.  Null terminated.
+  uint8_t device_id_[32];
+  // 128 bit AES key assigned to device.  Generated by Widevine.
+  uint8_t device_key_[16];
+  // Key Data.  Encrypted data.
+  uint8_t data_[72];
+  // Constant code used to recognize a valid keybox "kbox" = 0x6b626f78.
+  uint8_t magic_[4];
+  // The CRC checksum of the first 124 bytes of the keybox.
+  uint8_t crc_[4];
+} WidevineKeybox;
+
+}
+
+#endif // WV_KEYBOX_H_