int main(int argc, char **argv)
{
if (argc < 3)
{
printf("Usage: %s inputfile outputfile [privkeyfile]\n", argv[0]);
exit(0);
}
char *ptxtfname = argv[2];
char *ctxtfname = argv[1];
char *pkeyfname;
if (argc != 4)
{
pkeyfname = "id_rsa";
} else {
pkeyfname = argv[3];
}
FILE *fptxt = fopen(ptxtfname, "r");
FILE *fctxt = fopen(ctxtfname, "w");
FILE *fpkey = fopen(pkeyfname, "r");
key pkey;
mpz_init(pkey.p);
mpz_init(pkey.q);
mpz_init(pkey.n);
mpz_init(pkey.phi);
mpz_init(pkey.e);
mpz_init(pkey.d);
gmp_fscanf(fpkey, "%Zd", &pkey.p);
gmp_fscanf(fpkey, "%Zd", &pkey.q);
gmp_fscanf(fpkey, "%Zd", &pkey.n);
gmp_fscanf(fpkey, "%Zd", &pkey.phi);
gmp_fscanf(fpkey, "%Zd", &pkey.e);
gmp_fscanf(fpkey, "%Zd", &pkey.d);
int c = getc(fptxt);
int count = 0;
mpz_t next;
mpz_init(next);
while (c != EOF)
{
decrypt_char(next, c, pkey);
gmp_fprintf(fctxt, "%Zd\n", next);
c = getc(fptxt);
}
}
void decrypt_file(char *file_in, char *file_out, char *key, int key_size)
{
int i;
string input, output;
char *out_content;
//Précond.
if(file_in == NULL || file_out == NULL || key == NULL){
fprintf(stderr, "[decrypt_file] Erreur dans les paramètres\n");
exit(0);
}
//Traitement
input = readstring(file_in);
if((out_content = (char*) malloc(input.length * sizeof(char))) == NULL){
perror("[decrypt_file] Erreur dans l'allocation de la chaîne de résultat");
exit(MEM_ERROR);
}
//Déchiffrage du fichier d'entrée
for(i = 0; i < input.length; i++)
{
out_content[i] = decrypt_char(input.content[i], key[i%key_size]);
}
output.content = out_content;
output.length = input.length;
writestring(file_out, output);
//Nettoyage
free(out_content);
free(input.content);
}
