CHAPTER 79. “QR9”: RUBIK’S CUBE INSPIRED AMATEUR CRYPTO-ALGORITHM CHAPTER 79. “QR9”: RUBIK’S CUBE INSPIRED AMATEUR CRYPTO-ALGORITHM
};
void decrypt_file(char fin, char fout, char pw)
{
FILE f;
int real_flen, flen;
BYTE *buf;
f=fopen(fin, "rb");
if (f==NULL)
{
printf ("Cannot open input file!\n");
return;
};
fseek (f, 0, SEEK_END);
flen=ftell (f);
fseek (f, 0, SEEK_SET);
buf=(BYTE*)malloc (flen);
fread (buf, flen, 1, f);
fclose (f);
if (memcmp (buf, "QR9", 3)!=0)
{
printf ("File is not encrypted!\n");
return;
};
memcpy (&real_flen, buf+3, 4);
decrypt (buf+(3+4), flen-(3+4), pw);
f=fopen(fout, "wb");
fwrite (buf+(3+4), real_flen, 1, f);
fclose (f);
free (buf);
};
// run: input output 0/1 password
// 0 for encrypt, 1 for decrypt
int main(int argc, char *argv[])
{
if (argc!=5)
{
printf ("Incorrect parameters!\n");
return 1;
};
if (strcmp (argv[3], "0")==0)
crypt_file (argv[1], argv[2], argv[4]);
else
if (strcmp (argv[3], "1")==0)
decrypt_file (argv[1], argv[2], argv[4]);
else
printf ("Wrong param %s\n", argv[3]);
return 0;
};