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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
This file is part of TALER
(C) 2014 Christian Grothoff (and other contributing authors)
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file key_io.c
* @brief I/O operations for the Mint's private keys
* @author Florian Dold
* @author Benedikt Mueller
* @author Sree Harsha Totakura
* @author Christian Grothoff
*/
#include "platform.h"
#include "key_io.h"
struct SignkeysIterateContext
{
TALER_MINT_SignkeyIterator it;
void *it_cls;
};
struct DenomkeysIterateContext
{
const char *alias;
TALER_MINT_DenomkeyIterator it;
void *it_cls;
};
static int
signkeys_iterate_dir_iter (void *cls,
const char *filename)
{
struct SignkeysIterateContext *skc = cls;
ssize_t nread;
struct TALER_MINT_SignKeyIssuePriv issue;
nread = GNUNET_DISK_fn_read (filename,
&issue,
sizeof (struct TALER_MINT_SignKeyIssuePriv));
if (nread != sizeof (struct TALER_MINT_SignKeyIssuePriv))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Invalid signkey file: '%s'\n", filename);
return GNUNET_OK;
}
return skc->it (skc->it_cls, &issue);
}
int
TALER_MINT_signkeys_iterate (const char *mint_base_dir,
TALER_MINT_SignkeyIterator it, void *cls)
{
char *signkey_dir;
size_t len;
struct SignkeysIterateContext skc;
len = GNUNET_asprintf (&signkey_dir, ("%s" DIR_SEPARATOR_STR DIR_SIGNKEYS), mint_base_dir);
GNUNET_assert (len > 0);
skc.it = it;
skc.it_cls = cls;
return GNUNET_DISK_directory_scan (signkey_dir, &signkeys_iterate_dir_iter, &skc);
}
/**
* Import a denomination key from the given file
*
* @param filename the file to import the key from
* @param dki pointer to return the imported denomination key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure
*/
int
TALER_MINT_read_denom_key (const char *filename,
struct TALER_MINT_DenomKeyIssuePriv *dki)
{
uint64_t size;
size_t offset;
void *data;
struct GNUNET_CRYPTO_rsa_PrivateKey *priv;
int ret;
ret = GNUNET_SYSERR;
data = NULL;
offset = sizeof (struct TALER_MINT_DenomKeyIssuePriv)
- offsetof (struct TALER_MINT_DenomKeyIssuePriv, issue.signature);
if (GNUNET_OK != GNUNET_DISK_file_size (filename,
&size,
GNUNET_YES,
GNUNET_YES))
goto cleanup;
if (size <= offset)
{
GNUNET_break (0);
goto cleanup;
}
data = GNUNET_malloc (size);
if (size != GNUNET_DISK_fn_read (filename,
data,
size))
goto cleanup;
if (NULL == (priv = GNUNET_CRYPTO_rsa_private_key_decode (data + offset,
size - offset)))
goto cleanup;
dki->denom_priv = priv;
memcpy (&dki->issue.signature, data, offset);
ret = GNUNET_OK;
cleanup:
GNUNET_free_non_null (data);
return ret;
}
/**
* Exports a denomination key to the given file
*
* @param filename the file where to write the denomination key
* @param dki the denomination key
* @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
*/
int
TALER_MINT_write_denom_key (const char *filename,
const struct TALER_MINT_DenomKeyIssuePriv *dki)
{
char *priv_enc;
size_t priv_enc_size;
struct GNUNET_DISK_FileHandle *fh;
ssize_t wrote;
size_t wsize;
int ret;
fh = NULL;
priv_enc_size = GNUNET_CRYPTO_rsa_private_key_encode (dki->denom_priv,
&priv_enc);
ret = GNUNET_SYSERR;
if (NULL == (fh = GNUNET_DISK_file_open
(filename,
GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_TRUNCATE,
GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE)))
goto cleanup;
wsize = sizeof (struct TALER_MINT_DenomKeyIssuePriv)
- offsetof (struct TALER_MINT_DenomKeyIssuePriv, issue.signature);
if (GNUNET_SYSERR == (wrote = GNUNET_DISK_file_write (fh,
&dki->issue.signature,
wsize)))
goto cleanup;
if (wrote != wsize)
goto cleanup;
if (GNUNET_SYSERR == (wrote = GNUNET_DISK_file_write (fh,
priv_enc,
priv_enc_size)))
goto cleanup;
if (wrote != priv_enc_size)
goto cleanup;
ret = GNUNET_OK;
cleanup:
GNUNET_free_non_null (priv_enc);
if (NULL != fh)
(void) GNUNET_DISK_file_close (fh);
return ret;
}
static int
denomkeys_iterate_keydir_iter (void *cls,
const char *filename)
{
struct DenomkeysIterateContext *dic = cls;
struct TALER_MINT_DenomKeyIssuePriv issue;
if (GNUNET_OK != TALER_MINT_read_denom_key (filename, &issue))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Invalid denomkey file: '%s'\n",
filename);
return GNUNET_OK;
}
return dic->it (dic->it_cls, dic->alias, &issue);
}
static int
denomkeys_iterate_topdir_iter (void *cls,
const char *filename)
{
struct DenomkeysIterateContext *dic = cls;
dic->alias = GNUNET_STRINGS_get_short_name (filename);
// FIXME: differentiate between error case and normal iteration abortion
if (0 > GNUNET_DISK_directory_scan (filename, &denomkeys_iterate_keydir_iter, dic))
return GNUNET_SYSERR;
return GNUNET_OK;
}
int
TALER_MINT_denomkeys_iterate (const char *mint_base_dir,
TALER_MINT_DenomkeyIterator it, void *cls)
{
char *dir;
size_t len;
struct DenomkeysIterateContext dic;
len = GNUNET_asprintf (&dir,
"%s" DIR_SEPARATOR_STR DIR_DENOMKEYS,
mint_base_dir);
GNUNET_assert (len > 0);
dic.it = it;
dic.it_cls = cls;
// scan over alias dirs
return GNUNET_DISK_directory_scan (dir,
&denomkeys_iterate_topdir_iter,
&dic);
}
/* end of mint_common.c */
|
