X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/137d3b36ce3d121855364d3a28383ab86fbb9d7b..ae8cd973b817f81c075ab20e84d3239125146f24:/x25519.h

diff --git a/x25519.h b/x25519.h
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-/*
- * x25519.h: Bernstein's X25519 key-exchange function
- */
-/*
- * This file is Free Software.  It has been modified to as part of its
- * incorporation into secnet.
- *
- * Copyright 2017 Mark Wooding
- *
- * You may redistribute this file and/or modify it under the terms of
- * the permissive licence shown below.
- *
- * You may redistribute secnet as a whole and/or modify it under the
- * terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 3, or (at your option) any
- * later version.
- *
- * This program 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 a copy of the GNU General Public License
- * along with this program; if not, see
- * https://www.gnu.org/licenses/gpl.html.
- */
-/*
- * Imported from Catacomb, and modified for Secnet (2017-04-30):
- *
- *   * Use `fake-mLib-bits.h' in place of the real <mLib/bits.h>.
- *
- *   * Strip out the key-management definitions.
- *
- * The file's original comment headers are preserved below.
- */
-/* -*-c-*-
- *
- * The X25519 key-agreement algorithm
- *
- * (c) 2017 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb 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 Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#ifndef CATACOMB_X25519_H
-#define CATACOMB_X25519_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Notes on the X25519 key-agreement algorithm -----------------------*
- *
- * This is X25519, as described in Daniel J. Bernstein, `Curve25519: new
- * Diffie--Hellman speed records', PKC 2006,
- * https://cr.yp.to/ecdh/curve25519-20060209.pdf
- *
- * Since then, the name `Curve25519' has shifted somewhat, to refer to the
- * specific elliptic curve used, and the x-coordinate Diffie--Hellman
- * operation is now named `X25519'.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include "fake-mLib-bits.h"
-
-/*----- Important constants -----------------------------------------------*/
-
-#define X25519_KEYSZ 32u
-#define X25519_PUBSZ 32u
-#define X25519_OUTSZ 32u
-
-extern const octet x25519_base[32];
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @x25519@ --- *
- *
- * Arguments:	@octet zz[X25519_OUTSZ]@ = where to put the result
- *		@const octet k[X25519_KEYSZ]@ = pointer to private key
- *		@const octet qx[X25519_PUBSZ]@ = pointer to public value
- *
- * Returns:	---
- *
- * Use:		Calculates X25519 of @k@ and @qx@.
- *
- *		Note that there is disagreement over whether the most
- *		significant bit of @qx@ (i.e., the value @qx[31]&0x80@)
- *		should be ignored or counted towards the represented value.
- *		Historically implementations respected the bit; later
- *		convention seems to be to ignore it.  This implementation
- *		honours the bit: a caller who wants to ignore the bit can
- *		easily clear it, while caller who wants to respect it has a
- *		difficult job if this function ignores it.
- */
-
-extern void x25519(octet /*zz*/[X25519_OUTSZ],
-		   const octet /*k*/[X25519_KEYSZ],
-		   const octet /*qx*/[X25519_PUBSZ]);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif