b9f918a31d
If u and v both represent negative integers and their limb counts happen to differ, mpi_cmp will always return a positive value - this is obviously bogus. u is smaller than v if and only if it is larger in absolute value. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
68 lines
1.6 KiB
C
68 lines
1.6 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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int mpi_cmp(MPI u, MPI v)
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{
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mpi_size_t usize, vsize;
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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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if (!u->sign && v->sign)
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return 1;
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if (u->sign && !v->sign)
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return -1;
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if (usize != vsize && !u->sign && !v->sign)
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return usize - vsize;
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if (usize != vsize && u->sign && v->sign)
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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 (u->sign)
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return -cmp;
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return cmp;
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}
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EXPORT_SYMBOL_GPL(mpi_cmp);
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