ecc-mod-test.c 2.92 KB
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#include "testutils.h"

static void
ref_mod (mp_limb_t *rp, const mp_limb_t *ap, const mp_limb_t *mp, mp_size_t mn)
{
  mp_limb_t q[mn + 1];
  mpn_tdiv_qr (q, rp, 0, ap, 2*mn, mp, mn);
}

#define MAX_ECC_SIZE (1 + 521 / GMP_NUMB_BITS)
#define MAX_SIZE (2*MAX_ECC_SIZE)
#define COUNT 500

void
test_main (void)
{
  gmp_randstate_t state;
  mp_limb_t a[MAX_SIZE];
  mp_limb_t m[MAX_SIZE];
  mp_limb_t ref[MAX_SIZE];
  unsigned i;
  mpz_t r;

  gmp_randinit_default (state);
  
  mpz_init (r);
  
  for (i = 0; ecc_curves[i]; i++)
    {
      const struct ecc_curve *ecc = ecc_curves[i];
      unsigned j;
      for (j = 0; j < COUNT; j++)
	{
	  if (j & 1)
	    mpz_rrandomb (r, state, 2*ecc->size * GMP_NUMB_BITS);
	  else
	    mpz_urandomb (r, state, 2*ecc->size * GMP_NUMB_BITS);

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	  mpz_limbs_copy (a, r, 2*ecc->size);
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	  ref_mod (ref, a, ecc->p, ecc->size);

	  mpn_copyi (m, a, 2*ecc->size);
	  ecc->modp (ecc, m);
	  if (mpn_cmp (m, ecc->p, ecc->size) >= 0)
	    mpn_sub_n (m, m, ecc->p, ecc->size);

	  if (mpn_cmp (m, ref, ecc->size))
	    {
	      fprintf (stderr, "ecc->modp failed: bit_size = %u\n",
		       ecc->bit_size);
	      gmp_fprintf (stderr, "a   = %Nx\n", a, 2*ecc->size);
	      gmp_fprintf (stderr, "m   = %Nx (bad)\n", m, ecc->size);
	      gmp_fprintf (stderr, "ref = %Nx\n", ref, ecc->size);
	      abort ();
	    }

	  if (ecc->Bmodp_size < ecc->size)
	    {
	      mpn_copyi (m, a, 2*ecc->size);
	      ecc_generic_modp (ecc, m);
	      if (mpn_cmp (m, ecc->p, ecc->size) >= 0)
		mpn_sub_n (m, m, ecc->p, ecc->size);

	      if (mpn_cmp (m, ref, ecc->size))
		{
		  fprintf (stderr, "ecc_generic_modp failed: bit_size = %u\n",
			   ecc->bit_size);
		  gmp_fprintf (stderr, "a   = %Nx\n", a, 2*ecc->size);
		  gmp_fprintf (stderr, "m   = %Nx (bad)\n", m, ecc->size);
		  gmp_fprintf (stderr, "ref = %Nx\n", ref, ecc->size);
		  abort ();
		}
	    }

	  ref_mod (ref, a, ecc->q, ecc->size);

	  mpn_copyi (m, a, 2*ecc->size);
	  ecc->modq (ecc, m);
	  if (mpn_cmp (m, ecc->q, ecc->size) >= 0)
	    mpn_sub_n (m, m, ecc->q, ecc->size);

	  if (mpn_cmp (m, ref, ecc->size))
	    {
	      fprintf (stderr, "ecc->modq failed: bit_size = %u\n",
		       ecc->bit_size);
	      gmp_fprintf (stderr, "a   = %Nx\n", a, 2*ecc->size);
	      gmp_fprintf (stderr, "m   = %Nx (bad)\n", m, ecc->size);
	      gmp_fprintf (stderr, "ref = %Nx\n", ref, ecc->size);
	      abort ();
	    }

	  if (ecc->Bmodp_size < ecc->size)
	    {
	      mpn_copyi (m, a, 2*ecc->size);
	      ecc_generic_modq (ecc, m);
	      if (mpn_cmp (m, ecc->q, ecc->size) >= 0)
		mpn_sub_n (m, m, ecc->q, ecc->size);

	      if (mpn_cmp (m, ref, ecc->size))
		{
		  fprintf (stderr, "ecc_generic_modp failed: bit_size = %u\n",
			   ecc->bit_size);
		  gmp_fprintf (stderr, "a   = %Nx\n", a, 2*ecc->size);
		  gmp_fprintf (stderr, "m   = %Nx (bad)\n", m, ecc->size);
		  gmp_fprintf (stderr, "ref = %Nx\n", ref, ecc->size);
		  abort ();
		}
	    }
	}
    }

  mpz_clear (r);
  gmp_randclear (state);
}