text: /*
   * Copyright 2015-2018 Yubico AB
   *
   * 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 "rand.h"
  
  #ifdef _WIN32_BCRYPT
  #include <windows.h>
  #include <bcrypt.h>
  #include <ntstatus.h>
  #else
  #include <openssl/rand.h>
  #endif
  
  bool rand_generate(uint8_t *buf, size_t cb_buf) {
  
  #ifdef _WIN32_BCRYPT
    NTSTATUS status = STATUS_SUCCESS;
  
    BCRYPT_ALG_HANDLE hAlg = 0;
  
    if (!BCRYPT_SUCCESS(
          status =
            BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_RNG_ALGORITHM, NULL, 0))) {
      return false;
    }
  
    status = BCryptGenRandom(hAlg, buf, (ULONG) cb_buf, 0);
    BCryptCloseAlgorithmProvider(hAlg, 0);
  
    return BCRYPT_SUCCESS(status);
  
  #else
    return (1 == RAND_bytes(buf, cb_buf));
  
  #endif
  }
  