blob: bf076d281d4045da0b4b780ecd19a19db3987485 [file] [log] [blame]
Dmitry Kasatkincdec9cb2011-08-31 14:05:16 +03001/* mpiutil.ac - Utility functions for MPI
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 "mpi-internal.h"
22
23/****************
24 * Note: It was a bad idea to use the number of limbs to allocate
25 * because on a alpha the limbs are large but we normally need
26 * integers of n bits - So we should chnage this to bits (or bytes).
27 *
28 * But mpi_alloc is used in a lot of places :-)
29 */
30MPI mpi_alloc(unsigned nlimbs)
31{
32 MPI a;
33
34 a = kmalloc(sizeof *a, GFP_KERNEL);
35 if (!a)
36 return a;
37
38 if (nlimbs) {
39 a->d = mpi_alloc_limb_space(nlimbs);
40 if (!a->d) {
41 kfree(a);
42 return NULL;
43 }
44 } else {
45 a->d = NULL;
46 }
47
48 a->alloced = nlimbs;
49 a->nlimbs = 0;
50 a->sign = 0;
51 a->flags = 0;
52 a->nbits = 0;
53 return a;
54}
55EXPORT_SYMBOL_GPL(mpi_alloc);
56
57mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
58{
59 size_t len = nlimbs * sizeof(mpi_limb_t);
60
Dmitry Kasatkin4877e052012-01-26 19:13:19 +020061 if (!len)
62 return NULL;
63
Dmitry Kasatkincdec9cb2011-08-31 14:05:16 +030064 return kmalloc(len, GFP_KERNEL);
65}
66
67void mpi_free_limb_space(mpi_ptr_t a)
68{
69 if (!a)
70 return;
71
72 kfree(a);
73}
74
75void mpi_assign_limb_space(MPI a, mpi_ptr_t ap, unsigned nlimbs)
76{
77 mpi_free_limb_space(a->d);
78 a->d = ap;
79 a->alloced = nlimbs;
80}
81
82/****************
83 * Resize the array of A to NLIMBS. the additional space is cleared
84 * (set to 0) [done by m_realloc()]
85 */
86int mpi_resize(MPI a, unsigned nlimbs)
87{
88 void *p;
89
90 if (nlimbs <= a->alloced)
91 return 0; /* no need to do it */
92
93 if (a->d) {
94 p = kmalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
95 if (!p)
96 return -ENOMEM;
97 memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
98 kfree(a->d);
99 a->d = p;
100 } else {
101 a->d = kzalloc(nlimbs * sizeof(mpi_limb_t), GFP_KERNEL);
102 if (!a->d)
103 return -ENOMEM;
104 }
105 a->alloced = nlimbs;
106 return 0;
107}
108
Dmitry Kasatkincdec9cb2011-08-31 14:05:16 +0300109void mpi_free(MPI a)
110{
111 if (!a)
112 return;
113
114 if (a->flags & 4)
115 kfree(a->d);
116 else
117 mpi_free_limb_space(a->d);
118
119 if (a->flags & ~7)
120 pr_info("invalid flag value in mpi\n");
121 kfree(a);
122}
123EXPORT_SYMBOL_GPL(mpi_free);
Konstantin Khlebnikov4ff15822013-09-17 15:14:52 +0400124
125MODULE_DESCRIPTION("Multiprecision maths library");
126MODULE_LICENSE("GPL");