/* Copyright (c) 2017, Google Inc.

 *

 * Permission to use, copy, modify, and/or distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY

 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <limits.h>

#include <openssl/rand.h>

#include "../bcm_support.h"

#include "../fipsmodule/bcm_interface.h"

int RAND_bytes(uint8_t *buf, size_t len) {

  BCM_rand_bytes(buf, len);

  return 1;

}

int RAND_pseudo_bytes(uint8_t *buf, size_t len) { return RAND_bytes(buf, len); }

void RAND_seed(const void *buf, int num) {

  // OpenSSH calls |RAND_seed| before jailing on the assumption that any needed

  // file descriptors etc will be opened.

  uint8_t unused;

  RAND_bytes(&unused, sizeof(unused));

}

int RAND_load_file(const char *path, long num) {

  if (num < 0) {  // read the "whole file"

    return 1;

  } else if (num <= INT_MAX) {

    return (int)num;

  } else {

    return INT_MAX;

  }

}

const char *RAND_file_name(char *buf, size_t num) { return NULL; }

void RAND_add(const void *buf, int num, double entropy) {}

int RAND_egd(const char *path) { return 255; }

int RAND_poll(void) { return 1; }

int RAND_status(void) { return 1; }

static const struct rand_meth_st kSSLeayMethod = {

    RAND_seed, RAND_bytes,        RAND_cleanup,

    RAND_add,  RAND_pseudo_bytes, RAND_status,

};

RAND_METHOD *RAND_SSLeay(void) { return (RAND_METHOD *)&kSSLeayMethod; }

RAND_METHOD *RAND_OpenSSL(void) { return RAND_SSLeay(); }

const RAND_METHOD *RAND_get_rand_method(void) { return RAND_SSLeay(); }

int RAND_set_rand_method(const RAND_METHOD *method) { return 1; }

void RAND_cleanup(void) {}

void RAND_get_system_entropy_for_custom_prng(uint8_t *buf, size_t len) {

  if (len > 256) {

    abort();

  }

  CRYPTO_sysrand_for_seed(buf, len);

}