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diff --git a/tests/performance_tests/check_hash.h b/tests/performance_tests/check_hash.h
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+// Copyright (c) 2019, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 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
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma once
+
+#include "string_tools.h"
+#include "cryptonote_basic/difficulty.h"
+
+template<uint64_t hash_target_high, uint64_t hash_target_low, uint64_t difficulty_high, uint64_t difficulty_low>
+class test_check_hash
+{
+public:
+  static const size_t loop_count = 100000;
+
+  bool init()
+  {
+    cryptonote::difficulty_type hash_target = hash_target_high;
+    hash_target = (hash_target << 64) | hash_target_low;
+    difficulty = difficulty_high;
+    difficulty = (difficulty << 64) | difficulty_low;
+    boost::multiprecision::uint256_t hash_value =  std::numeric_limits<boost::multiprecision::uint256_t>::max() / hash_target;
+    ((uint64_t*)&hash)[0] = (hash_value << 64 >> 64).convert_to<uint64_t>();
+    hash_value >>= 64;
+    ((uint64_t*)&hash)[1] = (hash_value << 64 >> 64).convert_to<uint64_t>();
+    hash_value >>= 64;
+    ((uint64_t*)&hash)[2] = (hash_value << 64 >> 64).convert_to<uint64_t>();
+    hash_value >>= 64;
+    ((uint64_t*)&hash)[3] = (hash_value << 64 >> 64).convert_to<uint64_t>();
+    return true;
+  }
+
+  bool test()
+  {
+    cryptonote::check_hash_128(hash, difficulty);
+    return true;
+  }
+
+private:
+  crypto::hash hash;
+  cryptonote::difficulty_type difficulty;
+};