Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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// bitmessage cracker, build with g++ or MSVS to a shared library, use included python code for usage under bitmessage
#ifdef _WIN32
#include "winsock.h"
#include "windows.h"
#define uint64_t unsigned __int64
#else
#include <arpa/inet.h>
#include <pthread.h>
#include <stdint.h>
#endif
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__DragonFly__) || defined (__OpenBSD__) || defined (__NetBSD__)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#include "openssl/sha.h"
#define HASH_SIZE 64
#define BUFLEN 16384
#if defined(__GNUC__)
#define EXPORT __attribute__ ((__visibility__("default")))
#elif defined(_WIN32)
#define EXPORT __declspec(dllexport)
#endif
#ifndef __APPLE__
#define ntohll(x) ( ( (uint64_t)(ntohl( (unsigned int)((x << 32) >> 32) )) << 32) | ntohl( ((unsigned int)(x >> 32)) ) )
#endif
unsigned long long max_val;
unsigned char *initialHash;
unsigned long long successval = 0;
unsigned int numthreads = 0;
#ifdef _WIN32
DWORD WINAPI threadfunc(LPVOID param) {
#else
void * threadfunc(void* param) {
#endif
unsigned int incamt = *((unsigned int*)param);
SHA512_CTX sha;
unsigned char buf[HASH_SIZE + sizeof(uint64_t)] = { 0 };
unsigned char output[HASH_SIZE] = { 0 };
memcpy(buf + sizeof(uint64_t), initialHash, HASH_SIZE);
unsigned long long tmpnonce = incamt;
unsigned long long * nonce = (unsigned long long *)buf;
unsigned long long * hash = (unsigned long long *)output;
while (successval == 0) {
tmpnonce += numthreads;
(*nonce) = ntohll(tmpnonce); /* increment nonce */
SHA512_Init(&sha);
SHA512_Update(&sha, buf, HASH_SIZE + sizeof(uint64_t));
SHA512_Final(output, &sha);
SHA512_Init(&sha);
SHA512_Update(&sha, output, HASH_SIZE);
SHA512_Final(output, &sha);
if (ntohll(*hash) < max_val) {
successval = tmpnonce;
}
}
#ifdef _WIN32
return 0;
#else
return NULL;
#endif
}
void getnumthreads()
{
#ifdef _WIN32
DWORD_PTR dwProcessAffinity, dwSystemAffinity;
#elif __linux__
cpu_set_t dwProcessAffinity;
#elif __OpenBSD__
int mib[2], core_count = 0;
int dwProcessAffinity = 0;
size_t len2;
#else
int dwProcessAffinity = 0;
int32_t core_count = 0;
#endif
size_t len = sizeof(dwProcessAffinity);
if (numthreads > 0)
return;
#ifdef _WIN32
GetProcessAffinityMask(GetCurrentProcess(), &dwProcessAffinity, &dwSystemAffinity);
#elif __linux__
sched_getaffinity(0, len, &dwProcessAffinity);
#elif __OpenBSD__
len2 = sizeof(core_count);
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
if (sysctl(mib, 2, &core_count, &len2, 0, 0) == 0)
numthreads = core_count;
#else
if (sysctlbyname("hw.logicalcpu", &core_count, &len, 0, 0) == 0)
numthreads = core_count;
else if (sysctlbyname("hw.ncpu", &core_count, &len, 0, 0) == 0)
numthreads = core_count;
#endif
for (unsigned int i = 0; i < len * 8; i++)
#if defined(_WIN32)
#if defined(_MSC_VER)
if (dwProcessAffinity & (1i64 << i))
#else // CYGWIN/MINGW
if (dwProcessAffinity & (1ULL << i))
#endif
#elif defined __linux__
if (CPU_ISSET(i, &dwProcessAffinity))
#else
if (dwProcessAffinity & (1 << i))
#endif
numthreads++;
if (numthreads == 0) // something failed
numthreads = 1;
printf("Number of threads: %i\n", (int)numthreads);
}
extern "C" EXPORT unsigned long long BitmessagePOW(unsigned char * starthash, unsigned long long target)
{
successval = 0;
max_val = target;
getnumthreads();
initialHash = (unsigned char *)starthash;
# ifdef _WIN32
HANDLE* threads = (HANDLE*)calloc(sizeof(HANDLE), numthreads);
# else
pthread_t* threads = (pthread_t*)calloc(sizeof(pthread_t), numthreads);
struct sched_param schparam;
schparam.sched_priority = 0;
# endif
unsigned int *threaddata = (unsigned int *)calloc(sizeof(unsigned int), numthreads);
for (unsigned int i = 0; i < numthreads; i++) {
threaddata[i] = i;
# ifdef _WIN32
threads[i] = CreateThread(NULL, 0, threadfunc, (LPVOID)&threaddata[i], 0, NULL);
SetThreadPriority(threads[i], THREAD_PRIORITY_IDLE);
# else
pthread_create(&threads[i], NULL, threadfunc, (void*)&threaddata[i]);
# ifdef __linux__
pthread_setschedparam(threads[i], SCHED_IDLE, &schparam);
# else
pthread_setschedparam(threads[i], SCHED_RR, &schparam);
# endif
# endif
}
# ifdef _WIN32
WaitForMultipleObjects(numthreads, threads, TRUE, INFINITE);
# else
for (unsigned int i = 0; i < numthreads; i++) {
pthread_join(threads[i], NULL);
}
# endif
free(threads);
free(threaddata);
return successval;
}