src/ecc.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
   5  * Swiss federal institute of technology (ETH Zurich)
   6  * Subject to the GPL.
   7  */
   8
   9 /*
  10  *  seccure  -  Copyright 2009 B. Poettering
  11  *
  12  *  This program is free software; you can redistribute it and/or
  13  *  modify it under the terms of the GNU General Public License as
  14  *  published by the Free Software Foundation; either version 2 of the
  15  *  License, or (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  25  *  02111-1307 USA
  26  */
  27
  28 /*
  29  *   SECCURE Elliptic Curve Crypto Utility for Reliable Encryption
  30  *
  31  *              http://point-at-infinity.org/seccure/
  32  *
  33  *
  34  * seccure implements a selection of asymmetric algorithms based on
  35  * elliptic curve cryptography (ECC). See the manpage or the project's
  36  * homepage for further details.
  37  *
  38  * This code links against the GNU gcrypt library "libgcrypt" (which
  39  * is part of the GnuPG project). Use the included Makefile to build
  40  * the binary.
  41  *
  42  * Report bugs to: seccure AT point-at-infinity.org
  43  *
  44  */
  45
  46 #ifndef ECC_H
  47 #define ECC_H
  48
  49 #include <gcrypt.h>
  50
  51 struct affine_point {
  52         gcry_mpi_t x, y;
  53 };
  54
  55 struct jacobian_point {
  56         gcry_mpi_t x, y, z;
  57 };
  58
  59 struct domain_params {
  60         gcry_mpi_t a, b, m, order;
  61         struct affine_point base;
  62         int cofactor;
  63 };
  64
  65 extern struct affine_point point_new(void);
  66 extern void point_release(struct affine_point *p);
  67 extern void point_set(struct affine_point *p1, const struct affine_point *p2);
  68 extern void point_load_zero(struct affine_point *p);
  69 extern int point_is_zero(const struct affine_point *p);
  70 extern int point_on_curve(const struct affine_point *p,
  71                           const struct domain_params *dp);
  72 extern int point_compress(const struct affine_point *p);
  73 extern int point_decompress(struct affine_point *p, const gcry_mpi_t x,
  74                             int yflag, const struct domain_params *dp);
  75 extern void point_double(struct affine_point *p,
  76                          const struct domain_params *dp);
  77 extern void point_add(struct affine_point *p1, const struct affine_point *p2,
  78                       const struct domain_params *dp);
  79 extern struct jacobian_point jacobian_new(void);
  80 extern void jacobian_release(struct jacobian_point *p);
  81 extern void jacobian_load_affine(struct jacobian_point *p1,
  82                                  const struct affine_point *p2);
  83 extern void jacobian_load_zero(struct jacobian_point *p);
  84 extern int jacobian_is_zero(const struct jacobian_point *p);
  85 extern void jacobian_double(struct jacobian_point *p,
  86                             const struct domain_params *dp);
  87 extern void jacobian_affine_point_add(struct jacobian_point *p1,
  88                                       const struct affine_point *p2,
  89                                       const struct domain_params *dp);
  90 extern struct affine_point jacobian_to_affine(const struct jacobian_point *p,
  91                                               const struct domain_params *dp);
  92 extern struct affine_point pointmul(const struct affine_point *p,
  93                                     const gcry_mpi_t exp,
  94                                     const struct domain_params *dp);
  95 extern int embedded_key_validation(const struct affine_point *p,
  96                                    const struct domain_params *dp);
  97 extern int full_key_validation(const struct affine_point *p,
  98                                const struct domain_params *dp);
  99
 100 #endif /* ECC_H */