Root/
1 | /* |
2 | * Asynchronous block chaining cipher operations. |
3 | * |
4 | * This is the asynchronous version of blkcipher.c indicating completion |
5 | * via a callback. |
6 | * |
7 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the Free |
11 | * Software Foundation; either version 2 of the License, or (at your option) |
12 | * any later version. |
13 | * |
14 | */ |
15 | |
16 | #include <crypto/internal/skcipher.h> |
17 | #include <linux/cpumask.h> |
18 | #include <linux/err.h> |
19 | #include <linux/init.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> |
22 | #include <linux/rtnetlink.h> |
23 | #include <linux/sched.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/seq_file.h> |
26 | |
27 | #include "internal.h" |
28 | |
29 | static const char *skcipher_default_geniv __read_mostly; |
30 | |
31 | static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, |
32 | unsigned int keylen) |
33 | { |
34 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
35 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
36 | int ret; |
37 | u8 *buffer, *alignbuffer; |
38 | unsigned long absize; |
39 | |
40 | absize = keylen + alignmask; |
41 | buffer = kmalloc(absize, GFP_ATOMIC); |
42 | if (!buffer) |
43 | return -ENOMEM; |
44 | |
45 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
46 | memcpy(alignbuffer, key, keylen); |
47 | ret = cipher->setkey(tfm, alignbuffer, keylen); |
48 | memset(alignbuffer, 0, keylen); |
49 | kfree(buffer); |
50 | return ret; |
51 | } |
52 | |
53 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
54 | unsigned int keylen) |
55 | { |
56 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
57 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
58 | |
59 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { |
60 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
61 | return -EINVAL; |
62 | } |
63 | |
64 | if ((unsigned long)key & alignmask) |
65 | return setkey_unaligned(tfm, key, keylen); |
66 | |
67 | return cipher->setkey(tfm, key, keylen); |
68 | } |
69 | |
70 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
71 | u32 mask) |
72 | { |
73 | return alg->cra_ctxsize; |
74 | } |
75 | |
76 | int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req) |
77 | { |
78 | return crypto_ablkcipher_encrypt(&req->creq); |
79 | } |
80 | |
81 | int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req) |
82 | { |
83 | return crypto_ablkcipher_decrypt(&req->creq); |
84 | } |
85 | |
86 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, |
87 | u32 mask) |
88 | { |
89 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; |
90 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; |
91 | |
92 | if (alg->ivsize > PAGE_SIZE / 8) |
93 | return -EINVAL; |
94 | |
95 | crt->setkey = setkey; |
96 | crt->encrypt = alg->encrypt; |
97 | crt->decrypt = alg->decrypt; |
98 | if (!alg->ivsize) { |
99 | crt->givencrypt = skcipher_null_givencrypt; |
100 | crt->givdecrypt = skcipher_null_givdecrypt; |
101 | } |
102 | crt->base = __crypto_ablkcipher_cast(tfm); |
103 | crt->ivsize = alg->ivsize; |
104 | |
105 | return 0; |
106 | } |
107 | |
108 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
109 | __attribute__ ((unused)); |
110 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
111 | { |
112 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; |
113 | |
114 | seq_printf(m, "type : ablkcipher\n"); |
115 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
116 | "yes" : "no"); |
117 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
118 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); |
119 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); |
120 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); |
121 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>"); |
122 | } |
123 | |
124 | const struct crypto_type crypto_ablkcipher_type = { |
125 | .ctxsize = crypto_ablkcipher_ctxsize, |
126 | .init = crypto_init_ablkcipher_ops, |
127 | #ifdef CONFIG_PROC_FS |
128 | .show = crypto_ablkcipher_show, |
129 | #endif |
130 | }; |
131 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); |
132 | |
133 | static int no_givdecrypt(struct skcipher_givcrypt_request *req) |
134 | { |
135 | return -ENOSYS; |
136 | } |
137 | |
138 | static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, |
139 | u32 mask) |
140 | { |
141 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; |
142 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; |
143 | |
144 | if (alg->ivsize > PAGE_SIZE / 8) |
145 | return -EINVAL; |
146 | |
147 | crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ? |
148 | alg->setkey : setkey; |
149 | crt->encrypt = alg->encrypt; |
150 | crt->decrypt = alg->decrypt; |
151 | crt->givencrypt = alg->givencrypt; |
152 | crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; |
153 | crt->base = __crypto_ablkcipher_cast(tfm); |
154 | crt->ivsize = alg->ivsize; |
155 | |
156 | return 0; |
157 | } |
158 | |
159 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
160 | __attribute__ ((unused)); |
161 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
162 | { |
163 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; |
164 | |
165 | seq_printf(m, "type : givcipher\n"); |
166 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
167 | "yes" : "no"); |
168 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
169 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); |
170 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); |
171 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); |
172 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>"); |
173 | } |
174 | |
175 | const struct crypto_type crypto_givcipher_type = { |
176 | .ctxsize = crypto_ablkcipher_ctxsize, |
177 | .init = crypto_init_givcipher_ops, |
178 | #ifdef CONFIG_PROC_FS |
179 | .show = crypto_givcipher_show, |
180 | #endif |
181 | }; |
182 | EXPORT_SYMBOL_GPL(crypto_givcipher_type); |
183 | |
184 | const char *crypto_default_geniv(const struct crypto_alg *alg) |
185 | { |
186 | if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
187 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
188 | alg->cra_ablkcipher.ivsize) != |
189 | alg->cra_blocksize) |
190 | return "chainiv"; |
191 | |
192 | return alg->cra_flags & CRYPTO_ALG_ASYNC ? |
193 | "eseqiv" : skcipher_default_geniv; |
194 | } |
195 | |
196 | static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask) |
197 | { |
198 | struct rtattr *tb[3]; |
199 | struct { |
200 | struct rtattr attr; |
201 | struct crypto_attr_type data; |
202 | } ptype; |
203 | struct { |
204 | struct rtattr attr; |
205 | struct crypto_attr_alg data; |
206 | } palg; |
207 | struct crypto_template *tmpl; |
208 | struct crypto_instance *inst; |
209 | struct crypto_alg *larval; |
210 | const char *geniv; |
211 | int err; |
212 | |
213 | larval = crypto_larval_lookup(alg->cra_driver_name, |
214 | (type & ~CRYPTO_ALG_TYPE_MASK) | |
215 | CRYPTO_ALG_TYPE_GIVCIPHER, |
216 | mask | CRYPTO_ALG_TYPE_MASK); |
217 | err = PTR_ERR(larval); |
218 | if (IS_ERR(larval)) |
219 | goto out; |
220 | |
221 | err = -EAGAIN; |
222 | if (!crypto_is_larval(larval)) |
223 | goto drop_larval; |
224 | |
225 | ptype.attr.rta_len = sizeof(ptype); |
226 | ptype.attr.rta_type = CRYPTOA_TYPE; |
227 | ptype.data.type = type | CRYPTO_ALG_GENIV; |
228 | /* GENIV tells the template that we're making a default geniv. */ |
229 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; |
230 | tb[0] = &ptype.attr; |
231 | |
232 | palg.attr.rta_len = sizeof(palg); |
233 | palg.attr.rta_type = CRYPTOA_ALG; |
234 | /* Must use the exact name to locate ourselves. */ |
235 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); |
236 | tb[1] = &palg.attr; |
237 | |
238 | tb[2] = NULL; |
239 | |
240 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
241 | CRYPTO_ALG_TYPE_BLKCIPHER) |
242 | geniv = alg->cra_blkcipher.geniv; |
243 | else |
244 | geniv = alg->cra_ablkcipher.geniv; |
245 | |
246 | if (!geniv) |
247 | geniv = crypto_default_geniv(alg); |
248 | |
249 | tmpl = crypto_lookup_template(geniv); |
250 | err = -ENOENT; |
251 | if (!tmpl) |
252 | goto kill_larval; |
253 | |
254 | inst = tmpl->alloc(tb); |
255 | err = PTR_ERR(inst); |
256 | if (IS_ERR(inst)) |
257 | goto put_tmpl; |
258 | |
259 | if ((err = crypto_register_instance(tmpl, inst))) { |
260 | tmpl->free(inst); |
261 | goto put_tmpl; |
262 | } |
263 | |
264 | /* Redo the lookup to use the instance we just registered. */ |
265 | err = -EAGAIN; |
266 | |
267 | put_tmpl: |
268 | crypto_tmpl_put(tmpl); |
269 | kill_larval: |
270 | crypto_larval_kill(larval); |
271 | drop_larval: |
272 | crypto_mod_put(larval); |
273 | out: |
274 | crypto_mod_put(alg); |
275 | return err; |
276 | } |
277 | |
278 | static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, |
279 | u32 mask) |
280 | { |
281 | struct crypto_alg *alg; |
282 | |
283 | alg = crypto_alg_mod_lookup(name, type, mask); |
284 | if (IS_ERR(alg)) |
285 | return alg; |
286 | |
287 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
288 | CRYPTO_ALG_TYPE_GIVCIPHER) |
289 | return alg; |
290 | |
291 | if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
292 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
293 | alg->cra_ablkcipher.ivsize)) |
294 | return alg; |
295 | |
296 | crypto_mod_put(alg); |
297 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, |
298 | mask & ~CRYPTO_ALG_TESTED); |
299 | if (IS_ERR(alg)) |
300 | return alg; |
301 | |
302 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
303 | CRYPTO_ALG_TYPE_GIVCIPHER) { |
304 | if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { |
305 | crypto_mod_put(alg); |
306 | alg = ERR_PTR(-ENOENT); |
307 | } |
308 | return alg; |
309 | } |
310 | |
311 | BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
312 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
313 | alg->cra_ablkcipher.ivsize)); |
314 | |
315 | return ERR_PTR(crypto_givcipher_default(alg, type, mask)); |
316 | } |
317 | |
318 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, |
319 | u32 type, u32 mask) |
320 | { |
321 | struct crypto_alg *alg; |
322 | int err; |
323 | |
324 | type = crypto_skcipher_type(type); |
325 | mask = crypto_skcipher_mask(mask); |
326 | |
327 | alg = crypto_lookup_skcipher(name, type, mask); |
328 | if (IS_ERR(alg)) |
329 | return PTR_ERR(alg); |
330 | |
331 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); |
332 | crypto_mod_put(alg); |
333 | return err; |
334 | } |
335 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
336 | |
337 | struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name, |
338 | u32 type, u32 mask) |
339 | { |
340 | struct crypto_tfm *tfm; |
341 | int err; |
342 | |
343 | type = crypto_skcipher_type(type); |
344 | mask = crypto_skcipher_mask(mask); |
345 | |
346 | for (;;) { |
347 | struct crypto_alg *alg; |
348 | |
349 | alg = crypto_lookup_skcipher(alg_name, type, mask); |
350 | if (IS_ERR(alg)) { |
351 | err = PTR_ERR(alg); |
352 | goto err; |
353 | } |
354 | |
355 | tfm = __crypto_alloc_tfm(alg, type, mask); |
356 | if (!IS_ERR(tfm)) |
357 | return __crypto_ablkcipher_cast(tfm); |
358 | |
359 | crypto_mod_put(alg); |
360 | err = PTR_ERR(tfm); |
361 | |
362 | err: |
363 | if (err != -EAGAIN) |
364 | break; |
365 | if (signal_pending(current)) { |
366 | err = -EINTR; |
367 | break; |
368 | } |
369 | } |
370 | |
371 | return ERR_PTR(err); |
372 | } |
373 | EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher); |
374 | |
375 | static int __init skcipher_module_init(void) |
376 | { |
377 | skcipher_default_geniv = num_possible_cpus() > 1 ? |
378 | "eseqiv" : "chainiv"; |
379 | return 0; |
380 | } |
381 | |
382 | static void skcipher_module_exit(void) |
383 | { |
384 | } |
385 | |
386 | module_init(skcipher_module_init); |
387 | module_exit(skcipher_module_exit); |
388 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9