New Crypto "HAL" API.

Change-Id: I225cdfeffb7663a2d639a01cfe704aa12f9014b8
related-to-bug: 6275919

include/media/hardware/CryptoAPI.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2012 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 <utils/Errors.h>
+
+#ifndef CRYPTO_API_H_
+
+#define CRYPTO_API_H_
+
+namespace android {
+
+struct CryptoPlugin;
+
+struct CryptoFactory {
+    CryptoFactory() {}
+    virtual ~CryptoFactory() {}
+
+    virtual bool isCryptoSchemeSupported(const uint8_t uuid[16]) const = 0;
+
+    virtual status_t createPlugin(
+            const uint8_t uuid[16], const void *data, size_t size,
+            CryptoPlugin **plugin) = 0;
+
+private:
+    CryptoFactory(const CryptoFactory &);
+    CryptoFactory &operator=(const CryptoFactory &);
+};
+
+struct CryptoPlugin {
+    enum Mode {
+        kMode_Unencrypted = 0,
+        kMode_AES_CTR     = 1,
+
+        // Neither key nor iv are being used in this mode.
+        // Each subsample is encrypted w/ an iv of all zeroes.
+        kMode_AES_WV      = 2,  // FIX constant
+    };
+
+    struct SubSample {
+        size_t mNumBytesOfClearData;
+        size_t mNumBytesOfEncryptedData;
+    };
+
+    CryptoPlugin() {}
+    virtual ~CryptoPlugin() {}
+
+    // If this method returns false, a non-secure decoder will be used to
+    // decode the data after decryption. The decrypt API below will have
+    // to support insecure decryption of the data (secure = false) for
+    // media data of the given mime type.
+    virtual bool requiresSecureDecoderComponent(const char *mime) const = 0;
+
+    virtual status_t decrypt(
+            bool secure,
+            const uint8_t key[16],
+            const uint8_t iv[16],
+            Mode mode,
+            const void *srcPtr,
+            const SubSample *subSamples, size_t numSubSamples,
+            void *dstPtr) = 0;
+
+private:
+    CryptoPlugin(const CryptoPlugin &);
+    CryptoPlugin &operator=(const CryptoPlugin &);
+};
+
+}  // namespace android
+
+extern "C" {
+    extern android::CryptoFactory *createCryptoFactory();
+}
+
+#endif  // CRYPTO_API_H_