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Source at commit b386be689295730688885552666ea40b2e639b14 created 11 years 11 months ago. By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters." | |
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1 | /* |
2 | * seqiv: Sequence Number IV Generator |
3 | * |
4 | * This generator generates an IV based on a sequence number by xoring it |
5 | * with a salt. This algorithm is mainly useful for CTR and similar modes. |
6 | * |
7 | * Copyright (c) 2007 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/aead.h> |
17 | #include <crypto/internal/skcipher.h> |
18 | #include <crypto/rng.h> |
19 | #include <linux/err.h> |
20 | #include <linux/init.h> |
21 | #include <linux/kernel.h> |
22 | #include <linux/module.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/spinlock.h> |
25 | #include <linux/string.h> |
26 | |
27 | struct seqiv_ctx { |
28 | spinlock_t lock; |
29 | u8 salt[] __attribute__ ((aligned(__alignof__(u32)))); |
30 | }; |
31 | |
32 | static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err) |
33 | { |
34 | struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); |
35 | struct crypto_ablkcipher *geniv; |
36 | |
37 | if (err == -EINPROGRESS) |
38 | return; |
39 | |
40 | if (err) |
41 | goto out; |
42 | |
43 | geniv = skcipher_givcrypt_reqtfm(req); |
44 | memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv)); |
45 | |
46 | out: |
47 | kfree(subreq->info); |
48 | } |
49 | |
50 | static void seqiv_complete(struct crypto_async_request *base, int err) |
51 | { |
52 | struct skcipher_givcrypt_request *req = base->data; |
53 | |
54 | seqiv_complete2(req, err); |
55 | skcipher_givcrypt_complete(req, err); |
56 | } |
57 | |
58 | static void seqiv_aead_complete2(struct aead_givcrypt_request *req, int err) |
59 | { |
60 | struct aead_request *subreq = aead_givcrypt_reqctx(req); |
61 | struct crypto_aead *geniv; |
62 | |
63 | if (err == -EINPROGRESS) |
64 | return; |
65 | |
66 | if (err) |
67 | goto out; |
68 | |
69 | geniv = aead_givcrypt_reqtfm(req); |
70 | memcpy(req->areq.iv, subreq->iv, crypto_aead_ivsize(geniv)); |
71 | |
72 | out: |
73 | kfree(subreq->iv); |
74 | } |
75 | |
76 | static void seqiv_aead_complete(struct crypto_async_request *base, int err) |
77 | { |
78 | struct aead_givcrypt_request *req = base->data; |
79 | |
80 | seqiv_aead_complete2(req, err); |
81 | aead_givcrypt_complete(req, err); |
82 | } |
83 | |
84 | static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq, |
85 | unsigned int ivsize) |
86 | { |
87 | unsigned int len = ivsize; |
88 | |
89 | if (ivsize > sizeof(u64)) { |
90 | memset(info, 0, ivsize - sizeof(u64)); |
91 | len = sizeof(u64); |
92 | } |
93 | seq = cpu_to_be64(seq); |
94 | memcpy(info + ivsize - len, &seq, len); |
95 | crypto_xor(info, ctx->salt, ivsize); |
96 | } |
97 | |
98 | static int seqiv_givencrypt(struct skcipher_givcrypt_request *req) |
99 | { |
100 | struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); |
101 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); |
102 | struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); |
103 | crypto_completion_t complete; |
104 | void *data; |
105 | u8 *info; |
106 | unsigned int ivsize; |
107 | int err; |
108 | |
109 | ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv)); |
110 | |
111 | complete = req->creq.base.complete; |
112 | data = req->creq.base.data; |
113 | info = req->creq.info; |
114 | |
115 | ivsize = crypto_ablkcipher_ivsize(geniv); |
116 | |
117 | if (unlikely(!IS_ALIGNED((unsigned long)info, |
118 | crypto_ablkcipher_alignmask(geniv) + 1))) { |
119 | info = kmalloc(ivsize, req->creq.base.flags & |
120 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: |
121 | GFP_ATOMIC); |
122 | if (!info) |
123 | return -ENOMEM; |
124 | |
125 | complete = seqiv_complete; |
126 | data = req; |
127 | } |
128 | |
129 | ablkcipher_request_set_callback(subreq, req->creq.base.flags, complete, |
130 | data); |
131 | ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst, |
132 | req->creq.nbytes, info); |
133 | |
134 | seqiv_geniv(ctx, info, req->seq, ivsize); |
135 | memcpy(req->giv, info, ivsize); |
136 | |
137 | err = crypto_ablkcipher_encrypt(subreq); |
138 | if (unlikely(info != req->creq.info)) |
139 | seqiv_complete2(req, err); |
140 | return err; |
141 | } |
142 | |
143 | static int seqiv_aead_givencrypt(struct aead_givcrypt_request *req) |
144 | { |
145 | struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); |
146 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); |
147 | struct aead_request *areq = &req->areq; |
148 | struct aead_request *subreq = aead_givcrypt_reqctx(req); |
149 | crypto_completion_t complete; |
150 | void *data; |
151 | u8 *info; |
152 | unsigned int ivsize; |
153 | int err; |
154 | |
155 | aead_request_set_tfm(subreq, aead_geniv_base(geniv)); |
156 | |
157 | complete = areq->base.complete; |
158 | data = areq->base.data; |
159 | info = areq->iv; |
160 | |
161 | ivsize = crypto_aead_ivsize(geniv); |
162 | |
163 | if (unlikely(!IS_ALIGNED((unsigned long)info, |
164 | crypto_aead_alignmask(geniv) + 1))) { |
165 | info = kmalloc(ivsize, areq->base.flags & |
166 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: |
167 | GFP_ATOMIC); |
168 | if (!info) |
169 | return -ENOMEM; |
170 | |
171 | complete = seqiv_aead_complete; |
172 | data = req; |
173 | } |
174 | |
175 | aead_request_set_callback(subreq, areq->base.flags, complete, data); |
176 | aead_request_set_crypt(subreq, areq->src, areq->dst, areq->cryptlen, |
177 | info); |
178 | aead_request_set_assoc(subreq, areq->assoc, areq->assoclen); |
179 | |
180 | seqiv_geniv(ctx, info, req->seq, ivsize); |
181 | memcpy(req->giv, info, ivsize); |
182 | |
183 | err = crypto_aead_encrypt(subreq); |
184 | if (unlikely(info != areq->iv)) |
185 | seqiv_aead_complete2(req, err); |
186 | return err; |
187 | } |
188 | |
189 | static int seqiv_givencrypt_first(struct skcipher_givcrypt_request *req) |
190 | { |
191 | struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); |
192 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); |
193 | int err = 0; |
194 | |
195 | spin_lock_bh(&ctx->lock); |
196 | if (crypto_ablkcipher_crt(geniv)->givencrypt != seqiv_givencrypt_first) |
197 | goto unlock; |
198 | |
199 | crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt; |
200 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
201 | crypto_ablkcipher_ivsize(geniv)); |
202 | |
203 | unlock: |
204 | spin_unlock_bh(&ctx->lock); |
205 | |
206 | if (err) |
207 | return err; |
208 | |
209 | return seqiv_givencrypt(req); |
210 | } |
211 | |
212 | static int seqiv_aead_givencrypt_first(struct aead_givcrypt_request *req) |
213 | { |
214 | struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); |
215 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); |
216 | int err = 0; |
217 | |
218 | spin_lock_bh(&ctx->lock); |
219 | if (crypto_aead_crt(geniv)->givencrypt != seqiv_aead_givencrypt_first) |
220 | goto unlock; |
221 | |
222 | crypto_aead_crt(geniv)->givencrypt = seqiv_aead_givencrypt; |
223 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
224 | crypto_aead_ivsize(geniv)); |
225 | |
226 | unlock: |
227 | spin_unlock_bh(&ctx->lock); |
228 | |
229 | if (err) |
230 | return err; |
231 | |
232 | return seqiv_aead_givencrypt(req); |
233 | } |
234 | |
235 | static int seqiv_init(struct crypto_tfm *tfm) |
236 | { |
237 | struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm); |
238 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); |
239 | |
240 | spin_lock_init(&ctx->lock); |
241 | |
242 | tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request); |
243 | |
244 | return skcipher_geniv_init(tfm); |
245 | } |
246 | |
247 | static int seqiv_aead_init(struct crypto_tfm *tfm) |
248 | { |
249 | struct crypto_aead *geniv = __crypto_aead_cast(tfm); |
250 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); |
251 | |
252 | spin_lock_init(&ctx->lock); |
253 | |
254 | tfm->crt_aead.reqsize = sizeof(struct aead_request); |
255 | |
256 | return aead_geniv_init(tfm); |
257 | } |
258 | |
259 | static struct crypto_template seqiv_tmpl; |
260 | |
261 | static struct crypto_instance *seqiv_ablkcipher_alloc(struct rtattr **tb) |
262 | { |
263 | struct crypto_instance *inst; |
264 | |
265 | inst = skcipher_geniv_alloc(&seqiv_tmpl, tb, 0, 0); |
266 | |
267 | if (IS_ERR(inst)) |
268 | goto out; |
269 | |
270 | inst->alg.cra_ablkcipher.givencrypt = seqiv_givencrypt_first; |
271 | |
272 | inst->alg.cra_init = seqiv_init; |
273 | inst->alg.cra_exit = skcipher_geniv_exit; |
274 | |
275 | inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize; |
276 | |
277 | out: |
278 | return inst; |
279 | } |
280 | |
281 | static struct crypto_instance *seqiv_aead_alloc(struct rtattr **tb) |
282 | { |
283 | struct crypto_instance *inst; |
284 | |
285 | inst = aead_geniv_alloc(&seqiv_tmpl, tb, 0, 0); |
286 | |
287 | if (IS_ERR(inst)) |
288 | goto out; |
289 | |
290 | inst->alg.cra_aead.givencrypt = seqiv_aead_givencrypt_first; |
291 | |
292 | inst->alg.cra_init = seqiv_aead_init; |
293 | inst->alg.cra_exit = aead_geniv_exit; |
294 | |
295 | inst->alg.cra_ctxsize = inst->alg.cra_aead.ivsize; |
296 | |
297 | out: |
298 | return inst; |
299 | } |
300 | |
301 | static struct crypto_instance *seqiv_alloc(struct rtattr **tb) |
302 | { |
303 | struct crypto_attr_type *algt; |
304 | struct crypto_instance *inst; |
305 | int err; |
306 | |
307 | algt = crypto_get_attr_type(tb); |
308 | err = PTR_ERR(algt); |
309 | if (IS_ERR(algt)) |
310 | return ERR_PTR(err); |
311 | |
312 | err = crypto_get_default_rng(); |
313 | if (err) |
314 | return ERR_PTR(err); |
315 | |
316 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) |
317 | inst = seqiv_ablkcipher_alloc(tb); |
318 | else |
319 | inst = seqiv_aead_alloc(tb); |
320 | |
321 | if (IS_ERR(inst)) |
322 | goto put_rng; |
323 | |
324 | inst->alg.cra_alignmask |= __alignof__(u32) - 1; |
325 | inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); |
326 | |
327 | out: |
328 | return inst; |
329 | |
330 | put_rng: |
331 | crypto_put_default_rng(); |
332 | goto out; |
333 | } |
334 | |
335 | static void seqiv_free(struct crypto_instance *inst) |
336 | { |
337 | if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) |
338 | skcipher_geniv_free(inst); |
339 | else |
340 | aead_geniv_free(inst); |
341 | crypto_put_default_rng(); |
342 | } |
343 | |
344 | static struct crypto_template seqiv_tmpl = { |
345 | .name = "seqiv", |
346 | .alloc = seqiv_alloc, |
347 | .free = seqiv_free, |
348 | .module = THIS_MODULE, |
349 | }; |
350 | |
351 | static int __init seqiv_module_init(void) |
352 | { |
353 | return crypto_register_template(&seqiv_tmpl); |
354 | } |
355 | |
356 | static void __exit seqiv_module_exit(void) |
357 | { |
358 | crypto_unregister_template(&seqiv_tmpl); |
359 | } |
360 | |
361 | module_init(seqiv_module_init); |
362 | module_exit(seqiv_module_exit); |
363 | |
364 | MODULE_LICENSE("GPL"); |
365 | MODULE_DESCRIPTION("Sequence Number IV Generator"); |
366 |
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