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