53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
/*
|
|
* Copyright 2015 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.
|
|
*/
|
|
|
|
#ifndef SYSTEM_KEYMASTER_KDF_H_
|
|
#define SYSTEM_KEYMASTER_KDF_H_
|
|
|
|
#include <hardware/keymaster_defs.h>
|
|
#include <keymaster/android_keymaster_utils.h>
|
|
#include <keymaster/serializable.h>
|
|
|
|
#include <keymaster/UniquePtr.h>
|
|
|
|
namespace keymaster {
|
|
|
|
/**
|
|
* A base class for wrapping different key derivation functions.
|
|
*/
|
|
class Kdf {
|
|
public:
|
|
virtual ~Kdf() { memset_s(secret_key_.get(), 0, secret_key_len_); };
|
|
Kdf();
|
|
bool Init(keymaster_digest_t digest_type, const uint8_t* secret, size_t secret_len,
|
|
const uint8_t* salt, size_t salt_len);
|
|
virtual bool GenerateKey(const uint8_t* info, size_t info_len, uint8_t* output,
|
|
size_t output_len) = 0;
|
|
|
|
protected:
|
|
bool Uint32ToBigEndianByteArray(uint32_t number, uint8_t* output);
|
|
UniquePtr<uint8_t[]> secret_key_;
|
|
size_t secret_key_len_;
|
|
UniquePtr<uint8_t[]> salt_;
|
|
size_t salt_len_;
|
|
bool is_initialized_;
|
|
keymaster_digest_t digest_type_;
|
|
size_t digest_size_;
|
|
};
|
|
|
|
} // namespace keymaster
|
|
|
|
#endif // SYSTEM_KEYMASTER_KDF_H_
|