Function mi_random_init_ex

system/lib/mimalloc/src/random.c:172–194

}

static void mi_random_init_ex(mi_random_ctx_t* ctx, bool use_weak) {
  uint8_t key[32];
  if (use_weak || !_mi_prim_random_buf(key, sizeof(key))) {
    // if we fail to get random data from the OS, we fall back to a
    // weak random source based on the current time
    #if !defined(__wasi__)
    if (!use_weak) { _mi_warning_message("unable to use secure randomness\n"); }
    #endif
    uintptr_t x = _mi_os_random_weak(0);
    for (size_t i = 0; i < 32; i+=4, x++) {  
      x = _mi_random_shuffle(x);
      key[i]   = (uint8_t)(x);
      key[i+1] = (uint8_t)(x>>8);
      key[i+2] = (uint8_t)(x>>16);
      key[i+3] = (uint8_t)(x>>24);      
    }
    ctx->weak = true;
  }
  else {
    ctx->weak = false;
  }
  chacha_init(ctx, key, (uintptr_t)ctx /*nonce*/ );
}

void _mi_random_init(mi_random_ctx_t* ctx) {
  mi_random_init_ex(ctx, false);