110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
// Wagner's algorithm for Generalized Birthday Paradox, a memory-hard proof-of-work
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// Copyright (c) 2016 John Tromp
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#include "equi_dev_miner.h"
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#include <unistd.h>
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#include "ctype.h"
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int hextobyte(const char * x) {
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u32 b = 0;
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for (int i = 0; i < 2; i++) {
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uchar c = tolower(x[i]);
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assert(isxdigit(c));
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b = (b << 4) | (c - (c >= '0' && c <= '9' ? '0' : ('a' - 10)));
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}
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return b;
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}
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int main(int argc, char **argv) {
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int nthreads = 1;
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int nonce = 0;
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int range = 1;
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bool showsol = false;
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const char *header = "";
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const char *hex = "";
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int c;
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while ((c = getopt (argc, argv, "h:n:r:t:x:s")) != -1) {
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switch (c) {
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case 'h':
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header = optarg;
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break;
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case 'n':
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nonce = atoi(optarg);
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break;
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case 'r':
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range = atoi(optarg);
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break;
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case 's':
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showsol = true;
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break;
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case 't':
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nthreads = atoi(optarg);
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break;
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case 'x':
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hex = optarg;
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break;
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}
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}
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#ifndef XWITHASH
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if (sizeof(tree) > 4)
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printf("WARNING: please compile with -DXWITHASH to shrink tree!\n");
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#endif
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#ifdef ATOMIC
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if (nthreads==1)
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printf("WARNING: use of atomics hurts single threaded performance!\n");
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#else
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assert(nthreads==1);
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#endif
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printf("Looking for wagner-tree on (\"%s\",%d", hex ? "0x..." : header, nonce);
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if (range > 1)
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printf("-%d", nonce+range-1);
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printf(") with %d %d-bit digits and %d threads\n", NDIGITS, DIGITBITS, nthreads);
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thread_ctx *threads = (thread_ctx *)calloc(nthreads, sizeof(thread_ctx));
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assert(threads);
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equi eq(nthreads);
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printf("Using %dMB of memory", 1 + eq.hta.alloced / 0x100000);
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#ifdef USE_AVX2
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printf(" and AVX2 intrinsics to compute 4-way blake2b\n");
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#else
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printf(" and no AVX2\n");
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#endif
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u32 sumnsols = 0;
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char headernonce[HEADERNONCELEN];
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u32 hdrlen = strlen(header);
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if (*hex) {
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assert(strlen(hex) == 2 * HEADERNONCELEN);
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for (int i = 0; i < HEADERNONCELEN; i++)
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headernonce[i] = hextobyte(&hex[2*i]);
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} else {
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memcpy(headernonce, header, hdrlen);
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memset(headernonce+hdrlen, 0, sizeof(headernonce)-hdrlen);
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}
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for (int r = 0; r < range; r++) {
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((u32 *)headernonce)[32] = htole32(nonce+r);
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eq.setheadernonce(headernonce, sizeof(headernonce));
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for (int t = 0; t < nthreads; t++) {
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threads[t].id = t;
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threads[t].eq = &eq;
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int err = pthread_create(&threads[t].thread, NULL, worker, (void *)&threads[t]);
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assert(err == 0);
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}
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for (int t = 0; t < nthreads; t++) {
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int err = pthread_join(threads[t].thread, NULL);
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assert(err == 0);
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}
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u32 nsols, maxsols = min(MAXSOLS, eq.nsols);
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for (nsols = 0; nsols < maxsols; nsols++) {
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if (showsol) {
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printf("\nSolution");
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for (u32 i = 0; i < PROOFSIZE; i++)
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printf(" %jx", (uintmax_t)eq.sols[nsols][i]);
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}
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}
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printf("\n%d solutions\n", nsols);
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sumnsols += nsols;
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}
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free(threads);
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printf("%d total solutions\n", sumnsols);
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return 0;
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}
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