SHA-256 brute-forcer for https://shallenge.quirino.net

main.c

//
//  main.c
//  shallenge
//
//  Created by Grishka on 19.06.2024.
//

#include <stdio.h>
#include <CommonCrypto/CommonDigest.h>
#include <pthread.h>
#include <string.h>
#include <stdlib.h>

#define NTHREADS 10

pthread_mutex_t printMutex;

void* threadEntry(void *arg){
	unsigned int threadIndex=(unsigned int)(((size_t)arg) & 0xF);
	printf("Thread %d starting\n", (int)threadIndex);
	char strToHash[]="grishka/What+am+I+doing+with+my+life/AppleM1Max+CPU/00000000";
	//const char *hex="0123456789abcdef";
	//const char *hex="wxyzWXYZ+/123456789";
	const char *alphabet="0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM+/";
	unsigned int len=(unsigned int)strlen(strToHash);
	unsigned char hash[32];
	unsigned int *hashAsInts=(unsigned int*)hash;
	for(uint64_t i=threadIndex;i<=0xffffffffffff;i+=NTHREADS){
		/*strToHash[len-1]=hex[i & 0xF];
		strToHash[len-2]=hex[(i >> 4) & 0xF];
		strToHash[len-3]=hex[(i >> 8) & 0xF];
		strToHash[len-4]=hex[(i >> 12) & 0xF];
		strToHash[len-5]=hex[(i >> 16) & 0xF];
		strToHash[len-6]=hex[(i >> 20) & 0xF];
		strToHash[len-7]=hex[(i >> 24) & 0xF];
		strToHash[len-8]=hex[(i >> 28) & 0xF];*/
		strToHash[len-1]=alphabet[i & 63];
		strToHash[len-2]=alphabet[(i >> 6) & 63];
		strToHash[len-3]=alphabet[(i >> 12) & 63];
		strToHash[len-4]=alphabet[(i >> 18) & 63];
		strToHash[len-5]=alphabet[(i >> 24) & 63];
		strToHash[len-6]=alphabet[(i >> 30) & 63];
		strToHash[len-7]=alphabet[(i >> 36) & 63];
		strToHash[len-8]=alphabet[(i >> 42) & 63];
		CC_SHA256(strToHash, len, hash);
		//if((hashAsInts[0] & 0x0000ffff)==0){
		if(hashAsInts[0]==0){
			pthread_mutex_lock(&printMutex);
			printf("%s:\n", strToHash);
			for(int i=0;i<32;i++){
				if(i>0 && i%4==0)
					printf(" ");
				printf("%02x", hash[i]);
			}
			printf("\n\n");
			pthread_mutex_unlock(&printMutex);
		}
	}
	printf("Thread %d exiting\n", (int)threadIndex);
	return NULL;
}

int main(int argc, const char * argv[]) {
	pthread_mutex_init(&printMutex, NULL);
	pthread_t threads[NTHREADS];
	for(size_t i=0;i<NTHREADS;i++){
		pthread_create(&threads[i], NULL, threadEntry, (void*)i);
	}
	for(size_t i=0;i<NTHREADS;i++){
		pthread_join(threads[i], NULL);
	}
	return 0;
}