equality.h

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// Copyright (c) 2014-2019, The Monero Project
// 
// All rights reserved.
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// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
 
#pragma once
 
#include <string.h>
#include <sodium/crypto_verify_32.h>
 
struct memcmp32
{
  static const size_t loop_count = 1000000000;
  static int call(const unsigned char *k0, const unsigned char *k1){ return memcmp(k0, k1, 32); }
};
 
struct verify32
{
  static const size_t loop_count = 10000000;
  static int call(const unsigned char *k0, const unsigned char *k1){ return crypto_verify_32(k0, k1); }
};
 
template<typename f, bool equal>
class test_equality
{
public:
  static const size_t loop_count = f::loop_count;
 
  bool init()
  {
    for (int n = 0; n < 32; ++n)
      k0[n] = n;
    for (int n = 0; n < 32; ++n)
      k1[n] = equal ? n : n + 1;
    return true;
  }
 
  bool test()
  {
    return equal == !f::call(k0, k1);
  }
 
private:
  unsigned char k0[32];
  unsigned char k1[32];
};