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 #ifndef INCLUDE_KEYMASTER_RANDOM_SOURCE_H_
19 #define INCLUDE_KEYMASTER_RANDOM_SOURCE_H_
20 
21 #include <stdint.h>
22 #include <hardware/keymaster_defs.h>
23 
24 namespace keymaster {
25 
26 class RandomSource {
27 protected:
~RandomSource()28     virtual ~RandomSource () {}
29 
30 public:
31     /**
32      * Generates \p length random bytes, placing them in \p buf.
33      */
34     virtual keymaster_error_t GenerateRandom(uint8_t* buffer, size_t length) const = 0;
35 };
36 
37 } // namespace keymaster
38 
39 #endif  // INCLUDE_KEYMASTER_RANDOM_SOURCE_H_
40