cpuminer-opt-gpu/algo/skein/skein2.c

#include "miner.h"
#include "algo-gate-api.h"
#include <string.h>
#include <stdint.h>

#include "sph_skein.h"

// ctx caching seems slower with this algo
//typedef struct {
//        sph_skein512_context skein;
//} skein2_ctx_holder;

//skein2_ctx_holder skein2_ctx;

//void init_skein2_ctx()
//{
//        sph_skein512_init(&skein2_ctx.skein);
//}

void skein2hash(void *output, const void *input)
{
	sph_skein512_context ctx_skein;

	uint32_t hash[16] __attribute__ ((aligned (64)));

	sph_skein512_init(&ctx_skein);
	sph_skein512(&ctx_skein, input, 80);
	sph_skein512_close(&ctx_skein, hash);

	sph_skein512_init(&ctx_skein);
	sph_skein512(&ctx_skein, hash, 64);
	sph_skein512_close(&ctx_skein, hash);

	memcpy(output, hash, 32);

}

int scanhash_skein2(int thr_id, struct work *work,
	uint32_t max_nonce, uint64_t *hashes_done)
{
        uint32_t *pdata = work->data;
        uint32_t *ptarget = work->target;
	uint32_t hash64[8] __attribute__ ((aligned (64)));
	uint32_t endiandata[20] __attribute__ ((aligned (64)));
	const uint32_t Htarg = ptarget[7];
	const uint32_t first_nonce = pdata[19];
	uint32_t n = first_nonce;

        swab32_array( endiandata, pdata, 20 );

	do {
		be32enc(&endiandata[19], n);
		skein2hash(hash64, endiandata);
		if (hash64[7] < Htarg && fulltest(hash64, ptarget)) {
			*hashes_done = n - first_nonce + 1;
			pdata[19] = n;
			return true;
		}
		n++;

	} while (n < max_nonce && !work_restart[thr_id].restart);

	*hashes_done = n - first_nonce + 1;
	pdata[19] = n;

	return 0;
}

int64_t skein2_get_max64 ()
{
  return 0x7ffffLL;
}

bool register_skein2_algo( algo_gate_t* gate )
{
  gate->scanhash  = (void*)&scanhash_skein2;
  gate->hash      = (void*)&skein2hash;
  gate->get_max64 = (void*)&skein2_get_max64;
  return true;
};