1/* mpi-cmp.c - MPI functions
2 * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
3 *
4 * This file is part of GnuPG.
5 *
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19 */
20
21#include <linux/export.h>
22
23#include "mpi-internal.h"
24
25int mpi_cmp_ui(MPI u, unsigned long v)
26{
27 mpi_limb_t limb = v;
28
29 mpi_normalize(a: u);
30 if (u->nlimbs == 0) {
31 if (v == 0)
32 return 0;
33 else
34 return -1;
35 }
36 if (u->sign)
37 return -1;
38 if (u->nlimbs > 1)
39 return 1;
40
41 if (u->d[0] == limb)
42 return 0;
43 else if (u->d[0] > limb)
44 return 1;
45 else
46 return -1;
47}
48EXPORT_SYMBOL_GPL(mpi_cmp_ui);
49
50int mpi_cmp(MPI u, MPI v)
51{
52 mpi_size_t usize, vsize;
53 int cmp;
54
55 mpi_normalize(a: u);
56 mpi_normalize(a: v);
57 usize = u->nlimbs;
58 vsize = v->nlimbs;
59 if (!u->sign && v->sign)
60 return 1;
61 if (u->sign && !v->sign)
62 return -1;
63 if (usize != vsize && !u->sign && !v->sign)
64 return usize - vsize;
65 if (usize != vsize && u->sign && v->sign)
66 return vsize - usize;
67 if (!usize)
68 return 0;
69 cmp = mpihelp_cmp(op1_ptr: u->d, op2_ptr: v->d, size: usize);
70 if (u->sign)
71 return -cmp;
72 return cmp;
73}
74EXPORT_SYMBOL_GPL(mpi_cmp);
75

source code of linux/lib/crypto/mpi/mpi-cmp.c