/usr/include/botan/es_dev.h is in libbotan1.8-dev 1.8.13-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | /*
* /dev/random EntropySource
* (C) 1999-2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_ENTROPY_SRC_DEVICE_H__
#define BOTAN_ENTROPY_SRC_DEVICE_H__
#include <botan/entropy_src.h>
#include <vector>
#include <string>
namespace Botan {
class BOTAN_DLL Device_EntropySource : public EntropySource
   {
   public:
      std::string name() const { return "RNG Device Reader"; }
      void poll(Entropy_Accumulator& accum);
      Device_EntropySource(const std::vector<std::string>& fsnames);
      ~Device_EntropySource();
   private:
      /**
      A class handling reading from a Unix character device
      */
      class Device_Reader
         {
         public:
            typedef int fd_type;
            // Does not own fd, a transient class
            Device_Reader(fd_type device_fd) : fd(device_fd) {}
            void close();
            u32bit get(byte out[], u32bit length, u32bit ms_wait_time);
            static fd_type open(const std::string& pathname);
         private:
            fd_type fd;
         };
      std::vector<Device_Reader> devices;
   };
}
#endif
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