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/**
* Copyright (C) 2017 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.
*/
package android.hardware.cas.native@1.0;
/**
* Enumerates the keys used to scramble the content.
*/
enum ScramblingControl : uint32_t {
UNSCRAMBLED = 0,
RESERVED = 1,
EVENKEY = 2,
ODDKEY = 3,
};
/**
* A subsample consists of some number of bytes of clear (unscrambled)
* data followed by a number of bytes of scrambled data.
*/
struct SubSample {
uint32_t numBytesOfClearData;
uint32_t numBytesOfEncryptedData;
};
/**
* SharedBuffer describes a shared buffer which is defined by a heapBase, an
* offset and a size. The offset is relative to the shared memory base for the
* memory region identified by heapBase.
*/
struct SharedBuffer {
/**
* The shared memory base handle
*/
memory heapBase;
/**
* The offset from the shared memory base
*/
uint64_t offset;
/**
* The size of the shared buffer in bytes
*/
uint64_t size;
};
/**
* A descrambling destination buffer can be either normal user-space shared
* memory for the non-secure descrambling case, or it can be a secure buffer
* which is referenced by a native-handle. The native handle is allocated
* by the vendor's buffer allocator.
*/
enum BufferType : uint32_t {
SHARED_MEMORY = 0,
NATIVE_HANDLE = 1,
};
struct DestinationBuffer {
/**
* The type of the buffer
*/
BufferType type;
/**
* If type == SHARED_MEMORY, the descrambled data must be written
* to user-space non-secure shared memory.
*/
SharedBuffer nonsecureMemory;
/**
* If type == NATIVE_HANDLE, the descrambled data must be written
* to secure memory referenced by the vendor's buffer allocator.
*/
handle secureMemory;
};
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