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fca5cb4dd2
This partially reverts commit a8ea8bdd9d.
Most of it is no longer needed since sm2 has been removed. However,
the following functions have been kept as they have developed other
uses:
mpi_copy
mpi_mod
mpi_test_bit
mpi_set_bit
mpi_rshift
mpi_add
mpi_sub
mpi_addm
mpi_subm
mpi_mul
mpi_mulm
mpi_tdiv_r
mpi_fdiv_r
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
72 lines
1.7 KiB
C
72 lines
1.7 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 == 0) {
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if (v == 0)
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return 0;
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else
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return -1;
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}
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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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