/* Copyright 2019 Google LLC. All rights reserved. This file and proprietary */
/* source code may only be used and distributed under the Widevine Master */
/* License Agreement. */

#include "odk_util.h"

int crypto_memcmp(const void* in_a, const void* in_b, size_t len) {
  if (len == 0) {
    return 0;
  }

  /* Only valid pointers are allowed. */
  if (in_a == NULL || in_b == NULL) {
    return -1;
  }

  const uint8_t* a = (const uint8_t*)in_a;
  const uint8_t* b = (const uint8_t*)in_b;
  uint8_t x = 0;

  for (size_t i = 0; i < len; i++) {
    x |= a[i] ^ b[i];
  }
  return x;
}

bool ODK_NonceValuesEqual(const ODK_NonceValues* a, const ODK_NonceValues* b) {
  if (a == NULL || b == NULL) {
    return (a == b);
  }
  return (a->api_major_version == b->api_major_version &&
          a->api_minor_version == b->api_minor_version &&
          a->nonce == b->nonce && a->session_id == b->session_id);
}