crackit.c updated for 32-bit systems. Original code from http://guideme.itgo.com/atozofc/ch64.pdf

crackit32.c

/* This file has been altered to run correctly on 32-bit systems */
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <nmmintrin.h>
#define ZIP (0x04034b50) /* signature */
typedef short BOOLEAN;
#define TRUE (1)
#define FALSE (0)
unsigned int Crc32_Tbl[] =
{
	0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL,
	0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L,
	0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L,
	0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L,
	0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
	0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L,
	0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL,
	0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L,
	0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L,
	0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
	0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L,
	0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L,
	0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L,
	0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL,
	0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL,
	0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL,
	0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L,
	0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L,
	0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL,
	0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L,
	0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL,
	0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L,
	0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL,
	0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L,
	0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L,
	0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L,
	0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L,
	0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL,
	0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL,
	0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L,
	0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L,
	0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL,
	0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L,
	0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL,
	0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L,
	0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL,
	0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L,
	0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L,
	0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL,
	0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L,
	0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL,
	0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL,
	0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L,
	0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L,
	0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL,
	0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L,
	0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L,
	0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L,
	0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL,
	0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L,
	0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L,
	0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL,
	0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L,
	0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL
};
#define CRC32( x, y ) (Crc32_Tbl[((short)(x) ^ (y)) & 0xff] ^ ((x) >> 8))
// I7 or A10 CPU required
// #define CRC32(x,y) _mm_crc32_u32(x, y)
int main(int argc, char *argv[])
{
	BOOLEAN tried_all, found;
	unsigned int byte;
	short byte_num;
	int compressed_size;
	short extra_field_length;
	char file_name[1024];
	short file_name_length;
	short file_num;
	short flags;
	unsigned char header[3][12];
	unsigned int key[3];
	short num_enciphered;
	char password[255];
	char *password_ptr;
	int signature;
	unsigned char target[3];
	short tem;
	FILE *wordlist_fp, *zip_fp;
	if (argc < 3)
	{
		printf("Syntax: CRACKIT <zipfile> <wordslistfile> \a\n ");
		exit(1);
	}
	/* Check for file errors....*/
	if ((zip_fp = fopen(argv[1], "rb")) == NULL)
	{
		printf("Error: Couldn't open %s \a\n", argv[1]);
		exit(1);
	}
	if ((wordlist_fp = fopen(argv[2], "r")) == NULL)
	{
		printf("Error: Couldn't open %s \a\n", argv[2]);
		exit(1);
	}
	/* <- checked ok */

	/* Display start time*/
	time_t now;  
	time(&now);   
	printf("Start: %s", ctime(&now));

	/* Read the necessary informations from ZIP file... */
	num_enciphered = 0;
	while ((num_enciphered < 3)
		/* Read 4 bytes from ZIP file... */
		&& fread(&signature, 4, 1, zip_fp)
		&& (signature == ZIP))
	{
		/* Skip the version needed (2) */
		fseek(zip_fp, 2L, SEEK_CUR);

		/* Get the general purpose bit flag (2) */
		fread(&flags, 2, 1, zip_fp);

		/* If bit 0 is set, the file is encrypted */
		if (flags & (1 << 0)) /* bit0 set? */
		{
			/* Skip Compression method (2), last modified date+time (2+2),
			   3 bytes of the CRC32 hash (4) */
			fseek(zip_fp, 9L, SEEK_CUR);

			/* Get 1 byte of the CRC32 hash */
			fread(&(target[num_enciphered]), 1, 1, zip_fp);

			/* Get the compressed size (4) */
			fread(&compressed_size, 4, 1, zip_fp);

			/* Skip the uncompressed size (4) */
			fseek(zip_fp, 4L, SEEK_CUR);

			/* Get the file name length (2) */
			fread(&file_name_length, 2, 1, zip_fp);

			/* Get the extra field length (2) */
			fread(&extra_field_length, 2, 1, zip_fp);

			/* Get the file name*/
			fread(&file_name[0], 1, file_name_length, zip_fp);

			/* Null terminate the file name */
			file_name[file_name_length] = '\0';

			/* Skip the extra field */
			fseek(zip_fp, (int)extra_field_length, SEEK_CUR);
			fread(&(header[num_enciphered++][0]), 1, 12, zip_fp);
			compressed_size -= 12L;
			printf("%s is enciphered \n", &file_name[0]);
		}
		else
		{
			fseek(zip_fp, 10L, SEEK_CUR);
			fread(&compressed_size, 4, 1, zip_fp);
			fseek(zip_fp, 4L, SEEK_CUR);
			fread(&file_name_length, 2, 1, zip_fp);
			fread(&extra_field_length, 2, 1, zip_fp);
			compressed_size += file_name_length + extra_field_length;
		}
		fseek(zip_fp, compressed_size, SEEK_CUR);
	}
	fclose(zip_fp);
	if (num_enciphered == 0)
		printf("Nothing is enciphered in %s \n", argv[1]);
	else if (num_enciphered < 3)
	{
		printf("Less than 3 files are enciphered in %s \a\n",
			argv[1]);
		printf("CRACKIT requires at least 3 enciphered files \n");
	}
	else /* Crack using wordlist....*/
	{
		found = FALSE;
		byte_num = 0;
		while (fgets(&password[0], 255, wordlist_fp) != NULL)
		{
			password[strlen(&password[0]) - 1] = '\0';
			tried_all = TRUE;
			file_num = 0;
			while (tried_all && (file_num<num_enciphered))
			{
				key[0] = 305419896L;
				key[1] = 591751049L;
				key[2] = 878082192L;
				password_ptr = &password[0];
				while (*password_ptr != '\0')
				{
					byte = *(password_ptr++);
					key[0] = CRC32(key[0], byte);
					key[1] += key[0] & 0xff;
					key[1] = key[1] * 134775813L + 1;
					key[2] = CRC32(key[2], key[1] >> 24);
				}
				for (byte_num = 0; byte_num < 12; ++byte_num)
				{
					tem = key[2] | 2;
					byte = header[file_num][byte_num]
						^ (((tem*(tem ^ 1)) >> 8) & 0xff);
					key[0] = CRC32(key[0], byte);
					key[1] += key[0] & 0xff;
					key[1] = key[1] * 134775813L + 1;
					key[2] = CRC32(key[2], key[1] >> 24);
				}
				if (byte == target[file_num])
					++file_num;
				else
					tried_all = FALSE;
			}
			if (tried_all)
			{
				if (!found)
				{
					found = TRUE;
					printf("Passwords might be: \n");
				}
				printf("\t %s \n", &password[0]);
			}
		}
		if (!found)
			printf("%s don't hold the right Password \a\n",
			argv[2]);
		fclose(wordlist_fp);
	}

	/* Display end time*/
	time(&now);
	printf("End: %s", ctime(&now));

	return(0);
} /*--main( )------*/