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#include "testutils.h"
#define MAX_SIZE (1 + 521 / GMP_NUMB_BITS)
#define COUNT 50000
static void
test_add(const char *name,
const struct ecc_modulo *m,
const mpz_t az, const mpz_t bz)
{
mp_limb_t a[MAX_SIZE];
mp_limb_t b[MAX_SIZE];
mp_limb_t t[MAX_SIZE];
mpz_t mz;
mpz_t tz;
mpz_t ref;
mpz_init (ref);
mpz_add (ref, az, bz);
mpz_mod (ref, ref, mpz_roinit_n (mz, m->m, m->size));
mpz_limbs_copy (a, az, m->size);
mpz_limbs_copy (b, bz, m->size);
ecc_mod_add (m, t, a, b);
if (!mpz_congruent_p (ref, mpz_roinit_n (tz, t, m->size), mz))
{
fprintf (stderr, "ecc_mod_add %s failed: bit_size = %u\n",
name, m->bit_size);
fprintf (stderr, "a = ");
mpn_out_str (stderr, 16, a, m->size);
fprintf (stderr, "\nb = ");
mpn_out_str (stderr, 16, b, m->size);
fprintf (stderr, "\nt = ");
mpn_out_str (stderr, 16, t, m->size);
fprintf (stderr, " (bad)\nref = ");
mpz_out_str (stderr, 16, ref);
fprintf (stderr, "\n");
abort ();
}
mpz_clear (ref);
}
static void
test_sub(const char *name,
const struct ecc_modulo *m,
/* If range is non-null, check that 0 <= r < range. */
const mp_limb_t *range,
const mpz_t az, const mpz_t bz)
{
mp_limb_t a[MAX_SIZE];
mp_limb_t b[MAX_SIZE];
mp_limb_t t[MAX_SIZE];
mpz_t mz;
mpz_t tz;
mpz_t ref;
mpz_init (ref);
mpz_sub (ref, az, bz);
mpz_mod (ref, ref, mpz_roinit_n (mz, m->m, m->size));
mpz_limbs_copy (a, az, m->size);
mpz_limbs_copy (b, bz, m->size);
ecc_mod_sub (m, t, a, b);
if (!mpz_congruent_p (ref, mpz_roinit_n (tz, t, m->size), mz))
{
fprintf (stderr, "ecc_mod_sub %s failed: bit_size = %u\n",
name, m->bit_size);
fprintf (stderr, "a = ");
mpn_out_str (stderr, 16, a, m->size);
fprintf (stderr, "\nb = ");
mpn_out_str (stderr, 16, b, m->size);
fprintf (stderr, "\nt = ");
mpn_out_str (stderr, 16, t, m->size);
fprintf (stderr, " (bad)\nref = ");
mpz_out_str (stderr, 16, ref);
fprintf (stderr, "\n");
abort ();
}
if (range && mpn_cmp (t, range, m->size) >= 0)
{
fprintf (stderr, "ecc_mod_sub %s out of range: bit_size = %u\n",
name, m->bit_size);
fprintf (stderr, "a = ");
mpn_out_str (stderr, 16, a, m->size);
fprintf (stderr, "\nb = ");
mpn_out_str (stderr, 16, b, m->size);
fprintf (stderr, "\nt = ");
mpn_out_str (stderr, 16, t, m->size);
fprintf (stderr, " \nrange = ");
mpn_out_str (stderr, 16, range, m->size);
fprintf (stderr, "\n");
abort ();
}
mpz_clear (ref);
}
static void
test_modulo (gmp_randstate_t rands, const char *name,
const struct ecc_modulo *m, unsigned count)
{
mpz_t a, b;
unsigned j;
mpz_init (a);
mpz_init (b);
for (j = 0; j < count; j++)
{
if (j & 1)
{
mpz_rrandomb (a, rands, m->size * GMP_NUMB_BITS);
mpz_rrandomb (b, rands, m->size * GMP_NUMB_BITS);
}
else
{
mpz_urandomb (a, rands, m->size * GMP_NUMB_BITS);
mpz_urandomb (b, rands, m->size * GMP_NUMB_BITS);
}
test_add (name, m, a, b);
test_sub (name, m, NULL, a, b);
}
if (m->bit_size < m->size * GMP_NUMB_BITS)
{
mp_limb_t two_p[MAX_SIZE];
mpn_lshift (two_p, m->m, m->size, 1);
mpz_t range;
mpz_roinit_n (range, two_p, m->size);
mpz_urandomm (a, rands, range);
mpz_urandomm (b, rands, range);
test_sub (name, m, two_p, a, b);
}
mpz_clear (a);
mpz_clear (b);
}
void
test_main (void)
{
gmp_randstate_t rands;
unsigned count = COUNT;
unsigned i;
gmp_randinit_default (rands);
if (test_randomize(rands))
count *= 20;
for (i = 0; ecc_curves[i]; i++)
{
test_modulo (rands, "p", &ecc_curves[i]->p, count);
test_modulo (rands, "q", &ecc_curves[i]->q, count);
}
gmp_randclear (rands);
}
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