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Diffstat (limited to 'src/util/crypto_ecc_setup.c')
-rw-r--r-- | src/util/crypto_ecc_setup.c | 306 |
1 files changed, 0 insertions, 306 deletions
diff --git a/src/util/crypto_ecc_setup.c b/src/util/crypto_ecc_setup.c deleted file mode 100644 index f7cd8c6d9..000000000 --- a/src/util/crypto_ecc_setup.c +++ /dev/null | |||
@@ -1,306 +0,0 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2012, 2013, 2015, 2020 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file util/crypto_ecc_setup.c | ||
23 | * @brief helper function for easy EdDSA key setup | ||
24 | * @author Christian Grothoff | ||
25 | */ | ||
26 | #include "platform.h" | ||
27 | #include <gcrypt.h> | ||
28 | #include "gnunet_util_lib.h" | ||
29 | |||
30 | #define LOG(kind, ...) GNUNET_log_from (kind, "util-crypto-ecc", __VA_ARGS__) | ||
31 | |||
32 | #define LOG_STRERROR(kind, syscall) \ | ||
33 | GNUNET_log_from_strerror (kind, "util-crypto-ecc", syscall) | ||
34 | |||
35 | #define LOG_STRERROR_FILE(kind, syscall, filename) \ | ||
36 | GNUNET_log_from_strerror_file (kind, "util-crypto-ecc", syscall, filename) | ||
37 | |||
38 | /** | ||
39 | * Log an error message at log-level 'level' that indicates | ||
40 | * a failure of the command 'cmd' with the message given | ||
41 | * by gcry_strerror(rc). | ||
42 | */ | ||
43 | #define LOG_GCRY(level, cmd, rc) \ | ||
44 | do \ | ||
45 | { \ | ||
46 | LOG (level, \ | ||
47 | _ ("`%s' failed at %s:%d with error: %s\n"), \ | ||
48 | cmd, \ | ||
49 | __FILE__, \ | ||
50 | __LINE__, \ | ||
51 | gcry_strerror (rc)); \ | ||
52 | } while (0) | ||
53 | |||
54 | |||
55 | /** | ||
56 | * Read file to @a buf. Fails if the file does not exist or | ||
57 | * does not have precisely @a buf_size bytes. | ||
58 | * | ||
59 | * @param filename file to read | ||
60 | * @param[out] buf where to write the file contents | ||
61 | * @param buf_size number of bytes in @a buf | ||
62 | * @return #GNUNET_OK on success | ||
63 | */ | ||
64 | static enum GNUNET_GenericReturnValue | ||
65 | read_from_file (const char *filename, | ||
66 | void *buf, | ||
67 | size_t buf_size) | ||
68 | { | ||
69 | int fd; | ||
70 | struct stat sb; | ||
71 | |||
72 | fd = open (filename, | ||
73 | O_RDONLY); | ||
74 | if (-1 == fd) | ||
75 | { | ||
76 | memset (buf, | ||
77 | 0, | ||
78 | buf_size); | ||
79 | return GNUNET_SYSERR; | ||
80 | } | ||
81 | if (0 != fstat (fd, | ||
82 | &sb)) | ||
83 | { | ||
84 | GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, | ||
85 | "stat", | ||
86 | filename); | ||
87 | GNUNET_assert (0 == close (fd)); | ||
88 | memset (buf, | ||
89 | 0, | ||
90 | buf_size); | ||
91 | return GNUNET_SYSERR; | ||
92 | } | ||
93 | if (sb.st_size != buf_size) | ||
94 | { | ||
95 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
96 | "File `%s' has wrong size (%llu), expected %llu bytes\n", | ||
97 | filename, | ||
98 | (unsigned long long) sb.st_size, | ||
99 | (unsigned long long) buf_size); | ||
100 | GNUNET_assert (0 == close (fd)); | ||
101 | memset (buf, | ||
102 | 0, | ||
103 | buf_size); | ||
104 | return GNUNET_SYSERR; | ||
105 | } | ||
106 | if (buf_size != | ||
107 | read (fd, | ||
108 | buf, | ||
109 | buf_size)) | ||
110 | { | ||
111 | GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, | ||
112 | "read", | ||
113 | filename); | ||
114 | GNUNET_assert (0 == close (fd)); | ||
115 | memset (buf, | ||
116 | 0, | ||
117 | buf_size); | ||
118 | return GNUNET_SYSERR; | ||
119 | } | ||
120 | GNUNET_assert (0 == close (fd)); | ||
121 | return GNUNET_OK; | ||
122 | } | ||
123 | |||
124 | |||
125 | /** | ||
126 | * @ingroup crypto | ||
127 | * @brief Create a new private key by reading it from a file. | ||
128 | * | ||
129 | * If the files does not exist and @a do_create is set, creates a new key and | ||
130 | * write it to the file. | ||
131 | * | ||
132 | * If the contents of the file are invalid, an error is returned. | ||
133 | * | ||
134 | * @param filename name of file to use to store the key | ||
135 | * @param do_create should a file be created? | ||
136 | * @param[out] pkey set to the private key from @a filename on success | ||
137 | * @return #GNUNET_OK on success, #GNUNET_NO if @a do_create was set but | ||
138 | * we found an existing file, #GNUNET_SYSERR on failure | ||
139 | */ | ||
140 | enum GNUNET_GenericReturnValue | ||
141 | GNUNET_CRYPTO_eddsa_key_from_file (const char *filename, | ||
142 | int do_create, | ||
143 | struct GNUNET_CRYPTO_EddsaPrivateKey *pkey) | ||
144 | { | ||
145 | enum GNUNET_GenericReturnValue ret; | ||
146 | |||
147 | if (GNUNET_OK == | ||
148 | read_from_file (filename, | ||
149 | pkey, | ||
150 | sizeof (*pkey))) | ||
151 | { | ||
152 | /* file existed, report that we didn't create it... */ | ||
153 | return (do_create) ? GNUNET_NO : GNUNET_OK; | ||
154 | } | ||
155 | GNUNET_CRYPTO_eddsa_key_create (pkey); | ||
156 | ret = GNUNET_DISK_fn_write (filename, | ||
157 | pkey, | ||
158 | sizeof (*pkey), | ||
159 | GNUNET_DISK_PERM_USER_READ); | ||
160 | if ( (GNUNET_OK == ret) || | ||
161 | (GNUNET_SYSERR == ret) ) | ||
162 | return ret; | ||
163 | /* maybe another process succeeded in the meantime, try reading one more time */ | ||
164 | if (GNUNET_OK == | ||
165 | read_from_file (filename, | ||
166 | pkey, | ||
167 | sizeof (*pkey))) | ||
168 | { | ||
169 | /* file existed, report that *we* didn't create it... */ | ||
170 | return (do_create) ? GNUNET_NO : GNUNET_OK; | ||
171 | } | ||
172 | /* give up */ | ||
173 | return GNUNET_SYSERR; | ||
174 | } | ||
175 | |||
176 | |||
177 | /** | ||
178 | * @ingroup crypto | ||
179 | * @brief Create a new private key by reading it from a file. | ||
180 | * | ||
181 | * If the files does not exist and @a do_create is set, creates a new key and | ||
182 | * write it to the file. | ||
183 | * | ||
184 | * If the contents of the file are invalid, an error is returned. | ||
185 | * | ||
186 | * @param filename name of file to use to store the key | ||
187 | * @param do_create should a file be created? | ||
188 | * @param[out] pkey set to the private key from @a filename on success | ||
189 | * @return #GNUNET_OK on success, #GNUNET_NO if @a do_create was set but | ||
190 | * we found an existing file, #GNUNET_SYSERR on failure | ||
191 | */ | ||
192 | enum GNUNET_GenericReturnValue | ||
193 | GNUNET_CRYPTO_ecdsa_key_from_file (const char *filename, | ||
194 | int do_create, | ||
195 | struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey) | ||
196 | { | ||
197 | if (GNUNET_OK == | ||
198 | read_from_file (filename, | ||
199 | pkey, | ||
200 | sizeof (*pkey))) | ||
201 | { | ||
202 | /* file existed, report that we didn't create it... */ | ||
203 | return (do_create) ? GNUNET_NO : GNUNET_OK; | ||
204 | } | ||
205 | GNUNET_CRYPTO_ecdsa_key_create (pkey); | ||
206 | if (GNUNET_OK == | ||
207 | GNUNET_DISK_fn_write (filename, | ||
208 | pkey, | ||
209 | sizeof (*pkey), | ||
210 | GNUNET_DISK_PERM_USER_READ)) | ||
211 | return GNUNET_OK; | ||
212 | /* maybe another process succeeded in the meantime, try reading one more time */ | ||
213 | if (GNUNET_OK == | ||
214 | read_from_file (filename, | ||
215 | pkey, | ||
216 | sizeof (*pkey))) | ||
217 | { | ||
218 | /* file existed, report that *we* didn't create it... */ | ||
219 | return (do_create) ? GNUNET_NO : GNUNET_OK; | ||
220 | } | ||
221 | /* give up */ | ||
222 | return GNUNET_SYSERR; | ||
223 | } | ||
224 | |||
225 | |||
226 | /** | ||
227 | * Create a new private key by reading our peer's key from | ||
228 | * the file specified in the configuration. | ||
229 | * | ||
230 | * @param cfg the configuration to use | ||
231 | * @return new private key, NULL on error (for example, | ||
232 | * permission denied) | ||
233 | */ | ||
234 | struct GNUNET_CRYPTO_EddsaPrivateKey * | ||
235 | GNUNET_CRYPTO_eddsa_key_create_from_configuration ( | ||
236 | const struct GNUNET_CONFIGURATION_Handle *cfg) | ||
237 | { | ||
238 | struct GNUNET_CRYPTO_EddsaPrivateKey *priv; | ||
239 | char *fn; | ||
240 | |||
241 | if (GNUNET_OK != | ||
242 | GNUNET_CONFIGURATION_get_value_filename (cfg, | ||
243 | "PEER", | ||
244 | "PRIVATE_KEY", | ||
245 | &fn)) | ||
246 | return NULL; | ||
247 | priv = GNUNET_new (struct GNUNET_CRYPTO_EddsaPrivateKey); | ||
248 | GNUNET_CRYPTO_eddsa_key_from_file (fn, | ||
249 | GNUNET_YES, | ||
250 | priv); | ||
251 | GNUNET_free (fn); | ||
252 | return priv; | ||
253 | } | ||
254 | |||
255 | |||
256 | /** | ||
257 | * Retrieve the identity of the host's peer. | ||
258 | * | ||
259 | * @param cfg configuration to use | ||
260 | * @param dst pointer to where to write the peer identity | ||
261 | * @return #GNUNET_OK on success, #GNUNET_SYSERR if the identity | ||
262 | * could not be retrieved | ||
263 | */ | ||
264 | enum GNUNET_GenericReturnValue | ||
265 | GNUNET_CRYPTO_get_peer_identity (const struct GNUNET_CONFIGURATION_Handle *cfg, | ||
266 | struct GNUNET_PeerIdentity *dst) | ||
267 | { | ||
268 | struct GNUNET_CRYPTO_EddsaPrivateKey *priv; | ||
269 | |||
270 | if (NULL == (priv = GNUNET_CRYPTO_eddsa_key_create_from_configuration (cfg))) | ||
271 | { | ||
272 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
273 | _ ("Could not load peer's private key\n")); | ||
274 | return GNUNET_SYSERR; | ||
275 | } | ||
276 | GNUNET_CRYPTO_eddsa_key_get_public (priv, | ||
277 | &dst->public_key); | ||
278 | GNUNET_free (priv); | ||
279 | return GNUNET_OK; | ||
280 | } | ||
281 | |||
282 | |||
283 | /** | ||
284 | * Setup a key file for a peer given the name of the | ||
285 | * configuration file (!). This function is used so that | ||
286 | * at a later point code can be certain that reading a | ||
287 | * key is fast (for example in time-dependent testcases). | ||
288 | * | ||
289 | * @param cfg_name name of the configuration file to use | ||
290 | */ | ||
291 | void | ||
292 | GNUNET_CRYPTO_eddsa_setup_key (const char *cfg_name) | ||
293 | { | ||
294 | struct GNUNET_CONFIGURATION_Handle *cfg; | ||
295 | struct GNUNET_CRYPTO_EddsaPrivateKey *priv; | ||
296 | |||
297 | cfg = GNUNET_CONFIGURATION_create (); | ||
298 | (void) GNUNET_CONFIGURATION_load (cfg, cfg_name); | ||
299 | priv = GNUNET_CRYPTO_eddsa_key_create_from_configuration (cfg); | ||
300 | if (NULL != priv) | ||
301 | GNUNET_free (priv); | ||
302 | GNUNET_CONFIGURATION_destroy (cfg); | ||
303 | } | ||
304 | |||
305 | |||
306 | /* end of crypto_ecc_setup.c */ | ||