Line data    Source code

       1             : /* ecc-point-mul-g.c
       2             : 
       3             :    Copyright (C) 2013 Niels Möller
       4             : 
       5             :    This file is part of GNU Nettle.
       6             : 
       7             :    GNU Nettle is free software: you can redistribute it and/or
       8             :    modify it under the terms of either:
       9             : 
      10             :      * the GNU Lesser General Public License as published by the Free
      11             :        Software Foundation; either version 3 of the License, or (at your
      12             :        option) any later version.
      13             : 
      14             :    or
      15             : 
      16             :      * the GNU General Public License as published by the Free
      17             :        Software Foundation; either version 2 of the License, or (at your
      18             :        option) any later version.
      19             : 
      20             :    or both in parallel, as here.
      21             : 
      22             :    GNU Nettle is distributed in the hope that it will be useful,
      23             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      24             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      25             :    General Public License for more details.
      26             : 
      27             :    You should have received copies of the GNU General Public License and
      28             :    the GNU Lesser General Public License along with this program.  If
      29             :    not, see http://www.gnu.org/licenses/.
      30             : */
      31             : 
      32             : /* Development of Nettle's ECC support was funded by the .SE Internet Fund. */
      33             : 
      34             : #if HAVE_CONFIG_H
      35             : # include "config.h"
      36             : #endif
      37             : 
      38             : #include <assert.h>
      39             : 
      40             : #include <nettle/ecc.h>
      41             : #include "ecc/ecc-internal.h"
      42             : #include "ecc-gost-curve.h"
      43             : 
      44             : void
      45         622 : gost_point_mul_g (struct ecc_point *r, const struct ecc_scalar *n)
      46             : {
      47         622 :   const struct ecc_curve *ecc = r->ecc;
      48         622 :   mp_limb_t size = ecc->p.size;
      49         622 :   mp_size_t itch = 3*size + ecc->mul_g_itch;
      50         622 :   mp_limb_t *scratch = gmp_alloc_limbs (itch);
      51             : 
      52         622 :   assert (n->ecc == ecc);
      53         622 :   assert (ecc->h_to_a_itch <= ecc->mul_g_itch);
      54             : 
      55         622 :   ecc->mul_g (ecc, scratch, n->p, scratch + 3*size);
      56         622 :   ecc->h_to_a (ecc, 0, r->p, scratch, scratch + 3*size);
      57         622 :   gmp_free_limbs (scratch, itch);
      58         622 : }