risc0-core 0.1.0

RISC Zero core crate
Documentation 
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// Copyright 2022 Risc0, Inc.
//
// 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.

#include <cstdint>
#include <stdexcept>
#include <sys/random.h>

uint32_t get_random_u32() {
  uint32_t tmp;
  ssize_t err = getrandom(&tmp, sizeof(tmp), 0);
  if (err != sizeof(tmp)) {
    throw std::runtime_error("Unable to read from RNG device");
  }
  return tmp;
}