monero/tests/hash-target.cpp

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2014-03-03 15:07:58 -07:00
// Copyright (c) 2012-2013 The Cryptonote developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <limits>
#include "crypto/hash.h"
#include "cryptonote_core/difficulty.h"
using namespace std;
using cryptonote::check_hash;
int main(int argc, char *argv[]) {
crypto::hash h;
for (uint64_t diff = 1;; diff += 1 + (diff >> 8)) {
for (int b = 0; b < 256; b++) {
memset(&h, b, sizeof(crypto::hash));
if (check_hash(h, diff) != (b == 0 || diff <= 255 / b)) {
return 1;
}
if (b > 0) {
memset(&h, 0, sizeof(crypto::hash));
((char *) &h)[31] = b;
if (check_hash(h, diff) != (diff <= 255 / b)) {
return 1;
}
}
}
if (diff < numeric_limits<uint64_t>::max() / 256) {
uint64_t val = 0;
for (int i = 31; i >= 0; i--) {
val = val * 256 + 255;
((char *) &h)[i] = static_cast<char>(val / diff);
val %= diff;
}
if (check_hash(h, diff) != true) {
return 1;
}
if (diff > 1) {
for (int i = 0;; i++) {
if (i >= 32) {
abort();
}
if (++((char *) &h)[i] != 0) {
break;
}
}
if (check_hash(h, diff) != false) {
return 1;
}
}
}
if (diff + 1 + (diff >> 8) < diff) {
break;
}
}
return 0;
}