static mp_result s_rsa_transform(mp_int msg, mp_int exp,
mp_int mod, mp_int out)
{
if(mp_int_compare_zero(msg) < 0 ||
mp_int_compare(msg, mod) >= 0)
return MP_RANGE;
return mp_int_exptmod(msg, exp, mod, out);
}
int test_exptmod(testspec_t *t, FILE *ofp)
{
mp_int in[4], out[1];
mp_result res, expect;
if(!parse_int_values(t, in, out, &expect))
return imath_errno = MP_BADARG, 0;
if((res = mp_int_exptmod(in[0], in[1], in[2], in[3])) != expect)
return imath_errno = res, 0;
if(expect == MP_OK && mp_int_compare(in[3], out[0]) != 0) {
mp_int_to_string(in[3], 10, g_output, OUTPUT_LIMIT);
return imath_errno = OTHER_ERROR, 0;
}
return 1;
}
double get_exptmod_time(int nt, int prec)
{
clock_t start, end;
mp_int values;
int i;
if((values = alloc_values(4, prec)) == NULL)
return 0.0;
randomize_values(values, 3, prec);
start = clock();
for(i = 0; i < nt; ++i)
mp_int_exptmod(values, values + 1, values + 2, values + 3);
end = clock();
release_values(values, 4);
return clocks_to_seconds(start, end);
}
