1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Copyright (C) 2001,2002,2003 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* Here lie everything that has to do with large numbers, libgcrypt and
* other stuff that didn't fit anywhere else.
*/
#include <gnutls_int.h>
#include <libtasn1.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
/* Functions that refer to the libgcrypt library.
*/
void _gnutls_mpi_release( GNUTLS_MPI* x) {
if (*x==NULL) return;
gcry_mpi_release(*x);
*x=NULL;
}
/* returns zero on success
*/
int _gnutls_mpi_scan( GNUTLS_MPI *ret_mpi, const opaque *buffer, size_t *nbytes ) {
int ret;
ret = gcry_mpi_scan( ret_mpi, GCRYMPI_FMT_USG, buffer, *nbytes, nbytes);
if (ret) return GNUTLS_E_MPI_SCAN_FAILED;
/* MPIs with 0 bits are illegal
*/
if (_gnutls_mpi_get_nbits( *ret_mpi) == 0) {
_gnutls_mpi_release( ret_mpi);
return GNUTLS_E_MPI_SCAN_FAILED;
}
return 0;
}
int _gnutls_mpi_scan_pgp( GNUTLS_MPI *ret_mpi, const opaque *buffer, size_t *nbytes)
{
int ret;
ret = gcry_mpi_scan( ret_mpi, GCRYMPI_FMT_PGP, buffer, *nbytes, nbytes);
if (ret) return GNUTLS_E_MPI_SCAN_FAILED;
/* MPIs with 0 bits are illegal
*/
if (_gnutls_mpi_get_nbits( *ret_mpi) == 0) {
_gnutls_mpi_release( ret_mpi);
return GNUTLS_E_MPI_SCAN_FAILED;
}
return 0;
}
int _gnutls_mpi_print( void *buffer, size_t *nbytes, const GNUTLS_MPI a )
{
int ret;
if (nbytes == NULL || a == NULL) return GNUTLS_E_INVALID_REQUEST;
ret = gcry_mpi_print( GCRYMPI_FMT_USG, buffer, *nbytes, nbytes, a);
if (!ret) return ret;
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* Always has the first bit zero */
int _gnutls_mpi_print_lz( void *buffer, size_t *nbytes, const GNUTLS_MPI a )
{
int ret;
if (nbytes == NULL || a == NULL) return GNUTLS_E_INVALID_REQUEST;
ret = gcry_mpi_print( GCRYMPI_FMT_STD, buffer, *nbytes, nbytes, a);
if (!ret) return ret;
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* this function reads an integer
* from asn1 structs. Combines the read and mpi_scan
* steps.
*/
int _gnutls_x509_read_int( ASN1_TYPE node, const char* value,
GNUTLS_MPI* ret_mpi)
{
int result;
size_t s_len;
opaque* tmpstr = NULL;
int tmpstr_size;
tmpstr_size = 0;
result = asn1_read_value( node, value, NULL, &tmpstr_size);
if (result != ASN1_MEM_ERROR) {
gnutls_assert();
return _gnutls_asn2err(result);
}
tmpstr = gnutls_alloca( tmpstr_size);
if (tmpstr == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
result = asn1_read_value( node, value, tmpstr, &tmpstr_size);
if (result != ASN1_SUCCESS) {
gnutls_assert();
gnutls_afree( tmpstr);
return _gnutls_asn2err(result);
}
s_len = tmpstr_size;
if (_gnutls_mpi_scan( ret_mpi, tmpstr, &s_len) != 0) {
gnutls_assert();
gnutls_afree( tmpstr);
return GNUTLS_E_MPI_SCAN_FAILED;
}
gnutls_afree( tmpstr);
return 0;
}
/* Writes the specified integer into the specified node.
*/
int _gnutls_x509_write_int( ASN1_TYPE node, const char* value, GNUTLS_MPI mpi, int lz)
{
opaque *tmpstr;
size_t s_len;
int result;
s_len = 0;
if (lz) result = _gnutls_mpi_print_lz( NULL, &s_len, mpi);
else result = _gnutls_mpi_print( NULL, &s_len, mpi);
tmpstr = gnutls_alloca( s_len);
if (tmpstr == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
if (lz) result = _gnutls_mpi_print_lz( tmpstr, &s_len, mpi);
else result = _gnutls_mpi_print( tmpstr, &s_len, mpi);
if (result != 0) {
gnutls_assert();
gnutls_afree( tmpstr);
return GNUTLS_E_MPI_PRINT_FAILED;
}
result = asn1_write_value( node, value, tmpstr, s_len);
gnutls_afree( tmpstr);
if (result != ASN1_SUCCESS) {
gnutls_assert();
return _gnutls_asn2err(result);
}
return 0;
}
|
