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diff --git a/mpi/mpi-add.c b/mpi/mpi-add.c
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-/* mpi-add.c - MPI functions
- * Copyright (C) 1998 Free Software Foundation, Inc.
- * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
- *
- * This file is part of GnuPG.
- *
- * GnuPG is free software; you can redistribute it and/or modify
- * it under the terms of 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.
- *
- * GnuPG 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- *
- * Note: This code is heavily based on the GNU MP Library.
- * Actually it's the same code with only minor changes in the
- * way the data is stored; this is to support the abstraction
- * of an optional secure memory allocation which may be used
- * to avoid revealing of sensitive data due to paging etc.
- * The GNU MP Library itself is published under the LGPL;
- * however I decided to publish this code under the plain GPL.
- */
-
-#include <config.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "mpi-internal.h"
-
-
-/****************
- * Add the unsigned integer V to the mpi-integer U and store the
- * result in W. U and V may be the same.
- */
-void
-mpi_add_ui(MPI w, MPI u, unsigned long v )
-{
- mpi_ptr_t wp, up;
- mpi_size_t usize, wsize;
- int usign, wsign;
-
- usize = u->nlimbs;
- usign = u->sign;
- wsign = 0;
-
- /* If not space for W (and possible carry), increase space. */
- wsize = usize + 1;
- if( w->alloced < wsize )
- mpi_resize(w, wsize);
-
- /* These must be after realloc (U may be the same as W). */
- up = u->d;
- wp = w->d;
-
- if( !usize ) { /* simple */
- wp[0] = v;
- wsize = v? 1:0;
- }
- else if( !usign ) { /* mpi is not negative */
- mpi_limb_t cy;
- cy = mpihelp_add_1(wp, up, usize, v);
- wp[usize] = cy;
- wsize = usize + cy;
- }
- else { /* The signs are different. Need exact comparison to determine
- * which operand to subtract from which. */
- if( usize == 1 && up[0] < v ) {
- wp[0] = v - up[0];
- wsize = 1;
- }
- else {
- mpihelp_sub_1(wp, up, usize, v);
- /* Size can decrease with at most one limb. */
- wsize = usize - (wp[usize-1]==0);
- wsign = 1;
- }
- }
-
- w->nlimbs = wsize;
- w->sign = wsign;
-}
-
-
-void
-mpi_add(MPI w, MPI u, MPI v)
-{
- mpi_ptr_t wp, up, vp;
- mpi_size_t usize, vsize, wsize;
- int usign, vsign, wsign;
-
- if( u->nlimbs < v->nlimbs ) { /* Swap U and V. */
- usize = v->nlimbs;
- usign = v->sign;
- vsize = u->nlimbs;
- vsign = u->sign;
- wsize = usize + 1;
- RESIZE_IF_NEEDED(w, wsize);
- /* These must be after realloc (u or v may be the same as w). */
- up = v->d;
- vp = u->d;
- }
- else {
- usize = u->nlimbs;
- usign = u->sign;
- vsize = v->nlimbs;
- vsign = v->sign;
- wsize = usize + 1;
- RESIZE_IF_NEEDED(w, wsize);
- /* These must be after realloc (u or v may be the same as w). */
- up = u->d;
- vp = v->d;
- }
- wp = w->d;
- wsign = 0;
-
- if( !vsize ) { /* simple */
- MPN_COPY(wp, up, usize );
- wsize = usize;
- wsign = usign;
- }
- else if( usign != vsign ) { /* different sign */
- /* This test is right since USIZE >= VSIZE */
- if( usize != vsize ) {
- mpihelp_sub(wp, up, usize, vp, vsize);
- wsize = usize;
- MPN_NORMALIZE(wp, wsize);
- wsign = usign;
- }
- else if( mpihelp_cmp(up, vp, usize) < 0 ) {
- mpihelp_sub_n(wp, vp, up, usize);
- wsize = usize;
- MPN_NORMALIZE(wp, wsize);
- if( !usign )
- wsign = 1;
- }
- else {
- mpihelp_sub_n(wp, up, vp, usize);
- wsize = usize;
- MPN_NORMALIZE(wp, wsize);
- if( usign )
- wsign = 1;
- }
- }
- else { /* U and V have same sign. Add them. */
- mpi_limb_t cy = mpihelp_add(wp, up, usize, vp, vsize);
- wp[usize] = cy;
- wsize = usize + cy;
- if( usign )
- wsign = 1;
- }
-
- w->nlimbs = wsize;
- w->sign = wsign;
-}
-
-
-/****************
- * Subtract the unsigned integer V from the mpi-integer U and store the
- * result in W.
- */
-void
-mpi_sub_ui(MPI w, MPI u, unsigned long v )
-{
- mpi_ptr_t wp, up;
- mpi_size_t usize, wsize;
- int usign, wsign;
-
- usize = u->nlimbs;
- usign = u->sign;
- wsign = 0;
-
- /* If not space for W (and possible carry), increase space. */
- wsize = usize + 1;
- if( w->alloced < wsize )
- mpi_resize(w, wsize);
-
- /* These must be after realloc (U may be the same as W). */
- up = u->d;
- wp = w->d;
-
- if( !usize ) { /* simple */
- wp[0] = v;
- wsize = v? 1:0;
- wsign = 1;
- }
- else if( usign ) { /* mpi and v are negative */
- mpi_limb_t cy;
- cy = mpihelp_add_1(wp, up, usize, v);
- wp[usize] = cy;
- wsize = usize + cy;
- }
- else { /* The signs are different. Need exact comparison to determine
- * which operand to subtract from which. */
- if( usize == 1 && up[0] < v ) {
- wp[0] = v - up[0];
- wsize = 1;
- wsign = 1;
- }
- else {
- mpihelp_sub_1(wp, up, usize, v);
- /* Size can decrease with at most one limb. */
- wsize = usize - (wp[usize-1]==0);
- }
- }
-
- w->nlimbs = wsize;
- w->sign = wsign;
-}
-
-void
-mpi_sub(MPI w, MPI u, MPI v)
-{
- if( w == v ) {
- MPI vv = mpi_copy(v);
- vv->sign = !vv->sign;
- mpi_add( w, u, vv );
- mpi_free(vv);
- }
- else {
- /* fixme: this is not thread-save (we temp. modify v) */
- v->sign = !v->sign;
- mpi_add( w, u, v );
- v->sign = !v->sign;
- }
-}
-
-
-void
-mpi_addm( MPI w, MPI u, MPI v, MPI m)
-{
- mpi_add(w, u, v);
- mpi_fdiv_r( w, w, m );
-}
-
-void
-mpi_subm( MPI w, MPI u, MPI v, MPI m)
-{
- mpi_sub(w, u, v);
- mpi_fdiv_r( w, w, m );
-}
-
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