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Release 4.12 lib/mpi/generic_mpih-sub1.c

Directory: lib/mpi
/* mpihelp-add_2.c  -  MPI helper functions
 * Copyright (C) 1994, 1996, 1997, 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 "mpi-internal.h"
#include "longlong.h"


mpi_limb_t mpihelp_sub_n(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_ptr_t s2_ptr, mpi_size_t size) { mpi_limb_t x, y, cy; mpi_size_t j; /* The loop counter and index J goes from -SIZE to -1. This way the loop becomes faster. */ j = -size; /* Offset the base pointers to compensate for the negative indices. */ s1_ptr -= j; s2_ptr -= j; res_ptr -= j; cy = 0; do { y = s2_ptr[j]; x = s1_ptr[j]; y += cy; /* add previous carry to subtrahend */ cy = y < cy; /* get out carry from that addition */ y = x - y; /* main subtract */ cy += y > x; /* get out carry from the subtract, combine */ res_ptr[j] = y; } while (++j); return cy; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Kasatkin109100.00%1100.00%
Total109100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Dmitry Kasatkin116100.00%1100.00%
Total116100.00%1100.00%
Directory: lib/mpi
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