src/emulation/sky/random.cpp

   1 #include "random.hpp"
   2 #include <iostream>
   3 #include "library/sha256.hpp"
   4 #include "library/serialization.hpp"
   5 #include "interface/callbacks.hpp"
   6
   7 namespace sky
   8 {
   9         random::random()
  10         {
  11                 initialized = false;
  12         }
  13
  14         void random::init()
  15         {
  16                 memset(state, 0, 32);
  17                 serialization::u64l(state, ecore_callbacks->get_randomseed());
  18                 initialized = true;
  19         }
  20
  21         void random::push(uint32_t x)
  22         {
  23                 if(!initialized)
  24                         init();
  25                 uint8_t buf[4];
  26                 sha256 h;
  27                 h.write(state, 32);
  28                 serialization::u32l(buf, x);
  29                 h.write(buf, 4);
  30                 h.read(state);
  31         }
  32
  33         uint32_t random::pull()
  34         {
  35                 if(!initialized)
  36                         init();
  37                 uint32_t val = serialization::u32l(state);
  38                 sha256 h;
  39                 h.write(state, 32);
  40                 h.read(state);
  41                 return val;
  42         }
  43 }