GOSTCoin CUDA miner project, compatible with most nvidia cards, containing only gostd algo
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/**
* Wrapper to OpenSSL BIGNUM used by net diff (nBits)
*/
#include <stdio.h>
#include "uint256.h"
#include "bignum.hpp"
#include "miner.h" // hex2bin
extern "C" double bn_convert_nbits(const uint32_t nBits)
{
uint256 bn = CBigNum().SetCompact(nBits).getuint256();
return bn.getdouble();
}
// copy the big number to 32-bytes uchar
extern "C" void bn_nbits_to_uchar(const uint32_t nBits, unsigned char *target)
{
char buff[65];
uint256 bn = CBigNum().SetCompact(nBits).getuint256();
snprintf(buff, 65, "%s\n", bn.ToString().c_str()); buff[64] = '\0';
hex2bin(target, buff, 32);
}
// unused, but should allow more than 256bits targets
#if 0
extern "C" double bn_hash_target_ratio(uint32_t* hash, uint32_t* target)
{
double dhash;
if (!opt_showdiff)
return 0.0;
CBigNum h(0), t(0);
std::vector<unsigned char> vch(32);
memcpy(&vch[0], (void*) target, 32);
t.setvch(vch);
memcpy(&vch[0], (void*) hash, 32);
h.setvch(vch);
dhash = h.getuint256().getdouble();
if (dhash > 0.)
return t.getuint256().getdouble() / dhash;
else
return dhash;
}
#endif
// compute the diff ratio between a found hash and the target
extern "C" double bn_hash_target_ratio(uint32_t* hash, uint32_t* target)
{
uint256 h, t;
double dhash;
if (!opt_showdiff)
return 0.0;
memcpy(&t, (void*) target, 32);
memcpy(&h, (void*) hash, 32);
dhash = h.getdouble();
if (dhash > 0.)
return t.getdouble() / dhash;
else
return dhash;
}
// store ratio in work struct
extern "C" void bn_store_hash_target_ratio(uint32_t* hash, uint32_t* target, struct work* work)
{
// only if the option is enabled (to reduce cpu usage)
if (opt_showdiff) {
work->shareratio = bn_hash_target_ratio(hash, target);
work->sharediff = work->targetdiff * work->shareratio;
}
}