Hi Monks:  
I am in need of conceptual help in blending C and perl.
 
I am trying to protect a perl program that is complied with perl2EXE using a key device. Here is the approach I am taking:
 
A C program is launched which interrogates a key.
If the key is valid the C program reads in an encrypted file.
The file is decrypted in memory.
The decrypted file is a perl program (xx.pl) which goes into a string variable (xxpldecrypted).
The program has some 3000 lines.
The C program then launches the xx.pl via system(perl -e 'eval{xxpldecrypted}' ) perl -e gets snagged by the internal single quotes (since that is what surronds de eval's code). I cant just system("perl kk.pl parm1 parm2") becasue that will show up in the process stack, defeating the key would be easy.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <hasp_hl.h>
#include <hasp_vcode.h>

int kk () {
  hasp_status_t   status;
  hasp_handle_t   handle;
  int i;
  char filename[] = "prg";
  printf("start : ");
  status = hasp_login(HASP_PROGNUM_DEFAULT_FID,
                      (hasp_vendor_code_t *)vendor_code,
                      &handle);
  switch (status) {
    case HASP_STATUS_OK:
      printf("OK\n");

      ###################################################
      # this is where the read, decrypt and eval would go
      ###################################################

      hasp_logout(handle);
      return(1);
      break;
    default:
      printf("BAD\n");
      return(0);
  }
}

int main(void) {
   int result;
   result = kk();
   printf("result was %d\n",result);
}

[download]
The other approach I am using is Inline::C where I use the kk function as a function within perl. The idea is the function would stop the program from working if the key was invalid. Unfortunately, there seem to be some symbols that can't be resolved.
 
Any advice is appreciated.
 
Thanks!
Gary

In reply to Blending perl and C (two approaches) by holandes777

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