Add support for crypto HAL on L3 devices DO NOT MERGE

Includes widevine library release version 4.5.0.7571

Change-Id: I9e574d5606576aab376d0524a4bf1a81e5a61678
related-to-bug: 6427322
related-to-bug: 6427274

proprietary/cryptoPlugin/WVCryptoPlugin.h

@@ -20,6 +20,7 @@
 
 #include <media/hardware/CryptoAPI.h>
 #include <utils/threads.h>
+#include <openssl/aes.h>
 
 namespace android {
 
@@ -27,14 +28,16 @@ struct WVCryptoPlugin : public CryptoPlugin {
     WVCryptoPlugin(const void *data, size_t size);
     virtual ~WVCryptoPlugin();
 
+    const static size_t kAES128BlockSize = 16;
+
     status_t initCheck() const;
 
     virtual bool requiresSecureDecoderComponent(const char *mime) const;
 
     virtual status_t decrypt(
             bool secure,
-            const uint8_t key[16],
-            const uint8_t iv[16],
+            const uint8_t key[kAES128BlockSize],
+            const uint8_t iv[kAES128BlockSize],
             Mode mode,
             const void *srcPtr,
             const SubSample *subSamples, size_t numSubSamples,
@@ -42,9 +45,13 @@ struct WVCryptoPlugin : public CryptoPlugin {
             AString *errorDetailMsg);
 
 private:
+    status_t decryptSW(const uint8_t *key, uint8_t *out, const uint8_t *in, size_t length);
+
     Mutex mLock;
 
     status_t mInitCheck;
+    AES_KEY mAesKey;
+    uint8_t mEncKey[kAES128BlockSize];
 
     WVCryptoPlugin(const WVCryptoPlugin &);
     WVCryptoPlugin &operator=(const WVCryptoPlugin &);