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41 results

curve448-mul.c

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  • Niels Möller's avatar
    Niels Möller authored
    * curve25519-mul.c (curve25519_mul): Use ecc_mul_m.
    * curve448-mul.c (curve448_mul): Likewise.
    
    * ecc-mul-m.c (ecc_mul_m): New file and function. Implements
    multipliction for curves in Montgomery representation, as used for
    curve25519 and curve448. Extracted from curve25519_mul.
    * ecc-internal.h (ecc_mul_m): Declare.
    (ECC_MUL_M_ITCH): New macro.
    * Makefile.in (hogweed_SOURCES): Add ecc-mul-m.c.
    b33eea3b
    History
    curve448-mul.c 1.65 KiB
    /* curve448-mul.c
    
       Copyright (C) 2017 Daiki Ueno
       Copyright (C) 2017 Red Hat, Inc.
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * the GNU General Public License as published by the Free
           Software Foundation; either version 2 of the License, or (at your
           option) any later version.
    
       or both in parallel, as here.
    
       GNU Nettle is distributed in the hope that it will be useful,
       but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.
    
       You should have received copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    #include <string.h>
    
    #include "curve448.h"
    
    #include "ecc.h"
    #include "ecc-internal.h"
    
    /* Intended to be compatible with NaCl's crypto_scalarmult. */
    void
    curve448_mul (uint8_t *q, const uint8_t *n, const uint8_t *p)
    {
      const struct ecc_modulo *m = &_nettle_curve448.p;
      mp_size_t itch;
      mp_limb_t *x;
    
      itch = m->size + ECC_MUL_M_ITCH(m->size);
      x = gmp_alloc_limbs (itch);
    
      mpn_set_base256_le (x, m->size, p, CURVE448_SIZE);
      ecc_mul_m (m, 39081, 2, 446, x, n, x, x + m->size);
      mpn_get_base256_le (q, CURVE448_SIZE, x, m->size);
    
      gmp_free_limbs (x, itch);
    }