1 // Copyright 2023 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #pragma once 16 #include "pw_bluetooth_sapphire/internal/host/common/assert.h" 17 #include "pw_random/random.h" 18 19 namespace bt { 20 21 // Returns the global random number generator. This returns nullptr until it is 22 // configured by initialization code. 23 pw::random::RandomGenerator* random_generator(); 24 25 // Sets the global random number generator used by the host stack. To prevent 26 // overriding, the current generator must be nullptr or an assert will fail. 27 void set_random_generator(pw::random::RandomGenerator* generator); 28 29 template <typename T> Random()30T Random() { 31 static_assert(std::is_trivial_v<T> && !std::is_pointer_v<T>, 32 "Type cannot be filled with random bytes"); 33 PW_DCHECK(random_generator()); 34 T t; 35 random_generator()->Get({reinterpret_cast<std::byte*>(&t), sizeof(T)}); 36 return t; 37 } 38 39 } // namespace bt 40