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a8ea8bdd9d
Expand the mpi library based on libgcrypt, and the ECC algorithm of mpi based on libgcrypt requires these functions. Some other algorithms will be developed based on mpi ecc, such as SM2. Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> Tested-by: Xufeng Zhang <yunbo.xufeng@linux.alibaba.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
94 lines
2 KiB
C
94 lines
2 KiB
C
/* mpi-cmp.c - MPI functions
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* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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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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*
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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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*
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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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*/
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#include "mpi-internal.h"
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int mpi_cmp_ui(MPI u, unsigned long v)
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{
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mpi_limb_t limb = v;
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mpi_normalize(u);
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if (!u->nlimbs && !limb)
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return 0;
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if (u->sign)
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return -1;
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if (u->nlimbs > 1)
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return 1;
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if (u->d[0] == limb)
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return 0;
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else if (u->d[0] > limb)
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return 1;
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else
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return -1;
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}
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EXPORT_SYMBOL_GPL(mpi_cmp_ui);
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static int do_mpi_cmp(MPI u, MPI v, int absmode)
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{
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mpi_size_t usize;
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mpi_size_t vsize;
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int usign;
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int vsign;
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int cmp;
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mpi_normalize(u);
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mpi_normalize(v);
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usize = u->nlimbs;
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vsize = v->nlimbs;
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usign = absmode ? 0 : u->sign;
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vsign = absmode ? 0 : v->sign;
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/* Compare sign bits. */
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if (!usign && vsign)
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return 1;
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if (usign && !vsign)
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return -1;
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/* U and V are either both positive or both negative. */
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if (usize != vsize && !usign && !vsign)
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return usize - vsize;
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if (usize != vsize && usign && vsign)
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return vsize + usize;
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if (!usize)
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return 0;
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cmp = mpihelp_cmp(u->d, v->d, usize);
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if (!cmp)
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return 0;
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if ((cmp < 0?1:0) == (usign?1:0))
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return 1;
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return -1;
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}
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int mpi_cmp(MPI u, MPI v)
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{
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return do_mpi_cmp(u, v, 0);
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}
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EXPORT_SYMBOL_GPL(mpi_cmp);
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int mpi_cmpabs(MPI u, MPI v)
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{
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return do_mpi_cmp(u, v, 1);
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}
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EXPORT_SYMBOL_GPL(mpi_cmpabs);
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