1 /*
2 **
3 ** Copyright 2017, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 **     http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17 
18 #pragma once
19 
20 #include <hardware/keymaster_defs.h>
21 #include <stdint.h>
22 
23 namespace keymaster {
24 
25 class RandomSource {
26   protected:
~RandomSource()27     virtual ~RandomSource() {}
28 
29   public:
30     /**
31      * Generates \p length random bytes, placing them in \p buf.
32      */
33     virtual keymaster_error_t GenerateRandom(uint8_t* buffer, size_t length) const = 0;
34 };
35 
36 }  // namespace keymaster
37