summaryrefslogtreecommitdiffstats
path: root/mpi/mpi-mul.c
diff options
context:
space:
mode:
Diffstat (limited to 'mpi/mpi-mul.c')
-rw-r--r--mpi/mpi-mul.c215
1 files changed, 0 insertions, 215 deletions
diff --git a/mpi/mpi-mul.c b/mpi/mpi-mul.c
deleted file mode 100644
index 8748a3863..000000000
--- a/mpi/mpi-mul.c
+++ /dev/null
@@ -1,215 +0,0 @@
-/* mpi-mul.c - MPI functions
- * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
- * Copyright (C) 1998, 2001 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"
-
-
-void
-mpi_mul_ui( MPI prod, MPI mult, unsigned long small_mult )
-{
- mpi_size_t size, prod_size;
- mpi_ptr_t prod_ptr;
- mpi_limb_t cy;
- int sign;
-
- size = mult->nlimbs;
- sign = mult->sign;
-
- if( !size || !small_mult ) {
- prod->nlimbs = 0;
- prod->sign = 0;
- return;
- }
-
- prod_size = size + 1;
- if( prod->alloced < prod_size )
- mpi_resize( prod, prod_size );
- prod_ptr = prod->d;
-
- cy = mpihelp_mul_1( prod_ptr, mult->d, size, (mpi_limb_t)small_mult );
- if( cy )
- prod_ptr[size++] = cy;
- prod->nlimbs = size;
- prod->sign = sign;
-}
-
-
-void
-mpi_mul_2exp( MPI w, MPI u, unsigned long cnt)
-{
- mpi_size_t usize, wsize, limb_cnt;
- mpi_ptr_t wp;
- mpi_limb_t wlimb;
- int usign, wsign;
-
- usize = u->nlimbs;
- usign = u->sign;
-
- if( !usize ) {
- w->nlimbs = 0;
- w->sign = 0;
- return;
- }
-
- limb_cnt = cnt / BITS_PER_MPI_LIMB;
- wsize = usize + limb_cnt + 1;
- if( w->alloced < wsize )
- mpi_resize(w, wsize );
- wp = w->d;
- wsize = usize + limb_cnt;
- wsign = usign;
-
- cnt %= BITS_PER_MPI_LIMB;
- if( cnt ) {
- wlimb = mpihelp_lshift( wp + limb_cnt, u->d, usize, cnt );
- if( wlimb ) {
- wp[wsize] = wlimb;
- wsize++;
- }
- }
- else {
- MPN_COPY_DECR( wp + limb_cnt, u->d, usize );
- }
-
- /* Zero all whole limbs at low end. Do it here and not before calling
- * mpn_lshift, not to lose for U == W. */
- MPN_ZERO( wp, limb_cnt );
-
- w->nlimbs = wsize;
- w->sign = wsign;
-}
-
-
-
-void
-mpi_mul( MPI w, MPI u, MPI v)
-{
- mpi_size_t usize, vsize, wsize;
- mpi_ptr_t up, vp, wp;
- mpi_limb_t cy;
- int usign, vsign, usecure, vsecure, sign_product;
- int assign_wp=0;
- mpi_ptr_t tmp_limb=NULL;
-
-
- if( u->nlimbs < v->nlimbs ) { /* Swap U and V. */
- usize = v->nlimbs;
- usign = v->sign;
- usecure = mpi_is_secure(v);
- up = v->d;
- vsize = u->nlimbs;
- vsign = u->sign;
- vsecure = mpi_is_secure(u);
- vp = u->d;
- }
- else {
- usize = u->nlimbs;
- usign = u->sign;
- usecure = mpi_is_secure(u);
- up = u->d;
- vsize = v->nlimbs;
- vsign = v->sign;
- vsecure = mpi_is_secure(v);
- vp = v->d;
- }
- sign_product = usign ^ vsign;
- wp = w->d;
-
- /* Ensure W has space enough to store the result. */
- wsize = usize + vsize;
- if ( !mpi_is_secure (w) && (mpi_is_secure (u) || mpi_is_secure (v)) ) {
- /* w is not allocated in secure space but u or v is. To make sure
- * that no temporray results are stored in w, we temporary use
- * a newly allocated limb space for w */
- wp = mpi_alloc_limb_space( wsize, 1 );
- assign_wp = 2; /* mark it as 2 so that we can later copy it back to
- * mormal memory */
- }
- else if( w->alloced < wsize ) {
- if( wp == up || wp == vp ) {
- wp = mpi_alloc_limb_space( wsize, mpi_is_secure(w) );
- assign_wp = 1;
- }
- else {
- mpi_resize(w, wsize );
- wp = w->d;
- }
- }
- else { /* Make U and V not overlap with W. */
- if( wp == up ) {
- /* W and U are identical. Allocate temporary space for U. */
- up = tmp_limb = mpi_alloc_limb_space( usize, usecure );
- /* Is V identical too? Keep it identical with U. */
- if( wp == vp )
- vp = up;
- /* Copy to the temporary space. */
- MPN_COPY( up, wp, usize );
- }
- else if( wp == vp ) {
- /* W and V are identical. Allocate temporary space for V. */
- vp = tmp_limb = mpi_alloc_limb_space( vsize, vsecure );
- /* Copy to the temporary space. */
- MPN_COPY( vp, wp, vsize );
- }
- }
-
- if( !vsize )
- wsize = 0;
- else {
- cy = mpihelp_mul( wp, up, usize, vp, vsize );
- wsize -= cy? 0:1;
- }
-
- if( assign_wp ) {
- if (assign_wp == 2) {
- /* copy the temp wp from secure memory back to normal memory */
- mpi_ptr_t tmp_wp = mpi_alloc_limb_space (wsize, 0);
- MPN_COPY (tmp_wp, wp, wsize);
- mpi_free_limb_space (wp);
- wp = tmp_wp;
- }
- mpi_assign_limb_space( w, wp, wsize );
- }
- w->nlimbs = wsize;
- w->sign = sign_product;
- if( tmp_limb )
- mpi_free_limb_space( tmp_limb );
-}
-
-
-void
-mpi_mulm( MPI w, MPI u, MPI v, MPI m)
-{
- mpi_mul(w, u, v);
- mpi_fdiv_r( w, w, m );
-}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 07:51:19 +0100