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-rw-r--r--pwmanager/libcrypt/mpi/mpi-cmp.c74
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1/* mpi-cmp.c - MPI functions
2 * Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
3 *
4 * This file is part of Libgcrypt.
5 *
6 * Libgcrypt is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation; either version 2.1 of
9 * the License, or (at your option) any later version.
10 *
11 * Libgcrypt 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 Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License 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 <config.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include "mpi-internal.h"
25
26int
27gcry_mpi_cmp_ui( gcry_mpi_t u, unsigned long v )
28{
29 mpi_limb_t limb = v;
30
31 _gcry_mpi_normalize( u );
32 if( !u->nlimbs && !limb )
33 return 0;
34 if( u->sign )
35 return -1;
36 if( u->nlimbs > 1 )
37 return 1;
38
39 if( u->d[0] == limb )
40 return 0;
41 else if( u->d[0] > limb )
42 return 1;
43 else
44 return -1;
45}
46
47int
48gcry_mpi_cmp( gcry_mpi_t u, gcry_mpi_t v )
49{
50 mpi_size_t usize, vsize;
51 int cmp;
52
53 _gcry_mpi_normalize( u );
54 _gcry_mpi_normalize( v );
55 usize = u->nlimbs;
56 vsize = v->nlimbs;
57 if( !u->sign && v->sign )
58 return 1;
59 if( u->sign && !v->sign )
60 return -1;
61 if( usize != vsize && !u->sign && !v->sign )
62 return usize - vsize;
63 if( usize != vsize && u->sign && v->sign )
64 return vsize + usize;
65 if( !usize )
66 return 0;
67 if( !(cmp = _gcry_mpih_cmp( u->d, v->d, usize )) )
68 return 0;
69 if( (cmp < 0?1:0) == (u->sign?1:0))
70 return 1;
71 return -1;
72}
73
74