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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - lib/mpi/generic_mpih-mul1.c
1 /* mpihelp-mul_1.c - MPI helper functions
2 * Copyright (C) 1994, 1996, 1997, 1998, 2001 Free Software Foundation, Inc.
4 * This file is part of GnuPG.
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
20 * Note: This code is heavily based on the GNU MP Library.
21 * Actually it's the same code with only minor changes in the
22 * way the data is stored; this is to support the abstraction
23 * of an optional secure memory allocation which may be used
24 * to avoid revealing of sensitive data due to paging etc.
25 * The GNU MP Library itself is published under the LGPL;
26 * however I decided to publish this code under the plain GPL.
29 #include "mpi-internal.h"
33 mpihelp_mul_1(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
, mpi_size_t s1_size
,
38 mpi_limb_t prod_high
, prod_low
;
40 /* The loop counter and index J goes from -S1_SIZE to -1. This way
41 * the loop becomes faster. */
44 /* Offset the base pointers to compensate for the negative indices. */
50 umul_ppmm(prod_high
, prod_low
, s1_ptr
[j
], s2_limb
);
52 cy_limb
= (prod_low
< cy_limb
? 1 : 0) + prod_high
;
53 res_ptr
[j
] = prod_low
;