PyBitmessage/src/bitmsghash.cpp

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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>
#include "openssl/sha.h"
#define HASH_SIZE 64
#define BUFLEN 16384
#define ntohll(x) ( ( (uint64_t)(ntohl( (unsigned int)((x << 32) >> 32) )) << 32) | ntohl( ((unsigned int)(x >> 32)) ) )
unsigned long long max_val;
unsigned char *initialHash;
int numthreads = 8;
unsigned long long successval = 0;
#ifdef _WIN32
DWORD WINAPI threadfunc(LPVOID lpParameter) {
DWORD incamt = (DWORD)lpParameter;
#else
void * threadfunc(void* param) {
unsigned int incamt = (unsigned int)param;
#endif
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;
}
}
return NULL;
}
extern "C" __declspec(dllexport) unsigned long long BitmessagePOW(unsigned char * starthash, unsigned long long target)
{
successval = 0;
max_val = target;
initialHash = (unsigned char *)starthash;
# ifdef _WIN32
HANDLE* threads = (HANDLE*)calloc(sizeof(HANDLE), numthreads);
# else
pthread_t* threads = calloc(sizeof(pthread_t), numthreads);
# endif
for (int i = 0; i < numthreads; i++) {
# ifdef _WIN32
threads[i] = CreateThread(NULL, 0, threadfunc, (LPVOID)i, 0, NULL);
SetThreadPriority(threads[i], THREAD_PRIORITY_IDLE);
# else
pthread_create(&threads[i], NULL, threadfunc, (void*)i);
# endif
}
# ifdef _WIN32
WaitForMultipleObjects(numthreads, threads, TRUE, INFINITE);
# else
for (int i = 0; i < numthreads; i++) {
pthread_join(threads[i], NULL);
}
# endif
free(threads);
return successval;
}