+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * Buffer handling
- *
- * (c) 2001 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.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <string.h>
-
-#include "mp.h"
-#include "ec.h"
-#include "buf.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @buf_getmp@ --- *
- *
- * Arguments: @buf *b@ = pointer to a buffer block
- *
- * Returns: A multiprecision integer, or null if there wasn't one there.
- *
- * Use: Gets a multiprecision integer from a buffer.
- */
-
-mp *buf_getmp(buf *b)
-{
- uint16 sz;
- size_t n;
- mp *m;
- if (buf_getu16(b, &sz) || buf_ensure(b, sz))
- return (0);
- m = mp_loadb(MP_NEW, BCUR(b), sz);
- n = mp_octets(m);
- if (n != sz && n != 0 && sz != 1) {
- mp_drop(m);
- return (0);
- }
- BSTEP(b, sz);
- return (m);
-}
-
-/* --- @buf_putmp@ --- *
- *
- * Arguments: @buf *b@ = pointer to a buffer block
- * @mp *m@ = a multiprecision integer
- *
- * Returns: Zero if it worked, nonzero if there wasn't enough space.
- *
- * Use: Puts a multiprecision integer to a buffer.
- */
-
-int buf_putmp(buf *b, mp *m)
-{
- size_t sz = mp_octets(m);
- assert(sz < MASK16);
- if (!sz) sz = 1;
- if (buf_putu16(b, sz) || buf_ensure(b, sz))
- return (-1);
- mp_storeb(m, BCUR(b), sz);
- BSTEP(b, sz);
- return (0);
-}
-
-/* --- @buf_getec@ --- *
- *
- * Arguments: @buf *b@ = pointer to a buffer block
- * @ec *p@ = where to put the point
- *
- * Returns: Zero if it worked, nonzero if it failed.
- *
- * Use: Gets a multiprecision integer from a buffer. The point must
- * be initialized.
- */
-
-int buf_getec(buf *b, ec *p)
-{
- mp *x = 0, *y = 0;
- uint16 n;
- if (buf_ensure(b, 2)) return (-1);
- n = LOAD16(BCUR(b)); if (!n) { BSTEP(b, 2); EC_SETINF(p); return (0); }
- if ((x = buf_getmp(b)) == 0 || (y = buf_getmp(b)) == 0) {
- mp_drop(x); mp_drop(y); return (-1);
- }
- EC_DESTROY(p); p->x = x; p->y = y; p->z = 0;
- return (0);
-}
-
-/* --- @buf_putec@ --- *
- *
- * Arguments: @buf *b@ = pointer to a buffer block
- * @ec *p@ = an elliptic curve point
- *
- * Returns: Zero if it worked, nonzero if there wasn't enough space.
- *
- * Use: Puts an elliptic curve point to a buffer.
- */
-
-int buf_putec(buf *b, ec *p)
-{
- if (EC_ATINF(p)) return (buf_putu16(b, 0));
- if (buf_putmp(b, p->x) || buf_putmp(b, p->y)) return (-1);
- return (0);
-}
-
-/*----- That's all, folks -------------------------------------------------*/