skein.c

#include "miner.h"

#include <string.h>
#include <stdint.h>

#include <openssl/sha.h>

#include "sha3/sph_skein.h"

void skeinhash(void *state, const void *input)
{
	sph_skein512_context ctx_skein;
	SHA256_CTX sha256;

	uint32_t hash[16];

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

	SHA256_Init(&sha256);
	SHA256_Update(&sha256, hash, 64);
	SHA256_Final((unsigned char*) hash, &sha256);

	memcpy(state, hash, 32);
}

int scanhash_skein(int thr_id, struct work *work, uint32_t max_nonce, uint64_t *hashes_done)
{
	uint32_t _ALIGN(128) hash32[8];
	uint32_t _ALIGN(128) endiandata[20];
	uint32_t *pdata = work->data;
	uint32_t *ptarget = work->target;

	const uint32_t Htarg = ptarget[7];
	const uint32_t first_nonce = pdata[19];

	uint32_t n = first_nonce;

	for (int i=0; i < 19; i++) {
		be32enc(&endiandata[i], pdata[i]);
	};

	do {
		be32enc(&endiandata[19], n);
		skeinhash(hash32, endiandata);
		if (hash32[7] < Htarg && fulltest(hash32, ptarget)) {
			work_set_target_ratio(work, hash32);
			*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;
}