+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * Exponentiation in finite fields
- *
- * (c) 2004 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 "field.h"
-#include "field-exp.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @field_exp@ --- *
- *
- * Arguments: @field *f@ = pointer to field
- * @mp *d@ = fake destination
- * @mp *a@ = base
- * @mp *e@ = exponent
- *
- * Returns: Result, %$a^e$%.
- *
- * Use: Exponentiation in a finite field. Note that all quantities
- * are in internal format.
- */
-
-mp *field_exp(field *f, mp *d, mp *a, mp *e)
-{
- mp *x = MP_COPY(f->one);
- mp *spare = (e->f & MP_BURN) ? MP_NEWSEC : MP_NEW;
-
- MP_COPY(a);
- MP_SHRINK(e);
- if (MP_ZEROP(e))
- ;
- else {
- if (MP_NEGP(e))
- a = F_INV(f, a, a);
- if (MP_LEN(e) < EXP_THRESH)
- EXP_SIMPLE(x, a, e);
- else
- EXP_WINDOW(x, a, e);
- }
- mp_drop(d);
- mp_drop(spare);
- mp_drop(a);
- return (x);
-}
-
-/*----- That's all, folks -------------------------------------------------*/