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/* mpihelp-sub.c - MPI helper functions
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* Copyright (C) 1998 Free Software Foundation, Inc.
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* Copyright (C) 1994, 1996 Free Software Foundation, Inc.
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* This file is part of GnuPG.
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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#include "mpi-internal.h"
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mpihelp_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
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mpi_size_t s1_size, mpi_limb_t s2_limb )
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s2_limb = x - s2_limb;
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if( res_ptr != s1_ptr ) {
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for( i=0; i < s1_size-1; i++ )
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res_ptr[i] = s1_ptr[i];
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mpihelp_sub( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
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mpi_ptr_t s2_ptr, mpi_size_t s2_size)
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cy = mpihelp_sub_n(res_ptr, s1_ptr, s2_ptr, s2_size);
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if( s1_size - s2_size )
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cy = mpihelp_sub_1(res_ptr + s2_size, s1_ptr + s2_size,
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s1_size - s2_size, cy);