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Commit | Line | Data |
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64470f1b RS |
1 | /* LRW: as defined by Cyril Guyot in |
2 | * http://grouper.ieee.org/groups/1619/email/pdf00017.pdf | |
3 | * | |
4 | * Copyright (c) 2006 Rik Snel <rsnel@cube.dyndns.org> | |
5 | * | |
6c2205b8 | 6 | * Based on ecb.c |
64470f1b RS |
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 | /* This implementation is checked against the test vectors in the above | |
15 | * document and by a test vector provided by Ken Buchanan at | |
16 | * http://www.mail-archive.com/stds-p1619@listserv.ieee.org/msg00173.html | |
17 | * | |
18 | * The test vectors are included in the testing module tcrypt.[ch] */ | |
6c2205b8 | 19 | |
700cb3f5 HX |
20 | #include <crypto/internal/skcipher.h> |
21 | #include <crypto/scatterwalk.h> | |
64470f1b RS |
22 | #include <linux/err.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/scatterlist.h> | |
27 | #include <linux/slab.h> | |
28 | ||
29 | #include <crypto/b128ops.h> | |
30 | #include <crypto/gf128mul.h> | |
64470f1b | 31 | |
700cb3f5 HX |
32 | #define LRW_BUFFER_SIZE 128u |
33 | ||
217afccf EB |
34 | #define LRW_BLOCK_SIZE 16 |
35 | ||
171c0204 | 36 | struct priv { |
700cb3f5 | 37 | struct crypto_skcipher *child; |
217afccf EB |
38 | |
39 | /* | |
40 | * optimizes multiplying a random (non incrementing, as at the | |
41 | * start of a new sector) value with key2, we could also have | |
42 | * used 4k optimization tables or no optimization at all. In the | |
43 | * latter case we would have to store key2 here | |
44 | */ | |
45 | struct gf128mul_64k *table; | |
46 | ||
47 | /* | |
48 | * stores: | |
49 | * key2*{ 0,0,...0,0,0,0,1 }, key2*{ 0,0,...0,0,0,1,1 }, | |
50 | * key2*{ 0,0,...0,0,1,1,1 }, key2*{ 0,0,...0,1,1,1,1 } | |
51 | * key2*{ 0,0,...1,1,1,1,1 }, etc | |
52 | * needed for optimized multiplication of incrementing values | |
53 | * with key2 | |
54 | */ | |
55 | be128 mulinc[128]; | |
171c0204 JK |
56 | }; |
57 | ||
700cb3f5 HX |
58 | struct rctx { |
59 | be128 buf[LRW_BUFFER_SIZE / sizeof(be128)]; | |
60 | ||
61 | be128 t; | |
62 | ||
63 | be128 *ext; | |
64 | ||
65 | struct scatterlist srcbuf[2]; | |
66 | struct scatterlist dstbuf[2]; | |
67 | struct scatterlist *src; | |
68 | struct scatterlist *dst; | |
69 | ||
70 | unsigned int left; | |
71 | ||
72 | struct skcipher_request subreq; | |
73 | }; | |
74 | ||
64470f1b RS |
75 | static inline void setbit128_bbe(void *b, int bit) |
76 | { | |
8eb2dfac HX |
77 | __set_bit(bit ^ (0x80 - |
78 | #ifdef __BIG_ENDIAN | |
79 | BITS_PER_LONG | |
80 | #else | |
81 | BITS_PER_BYTE | |
82 | #endif | |
83 | ), b); | |
64470f1b RS |
84 | } |
85 | ||
217afccf EB |
86 | static int setkey(struct crypto_skcipher *parent, const u8 *key, |
87 | unsigned int keylen) | |
64470f1b | 88 | { |
217afccf EB |
89 | struct priv *ctx = crypto_skcipher_ctx(parent); |
90 | struct crypto_skcipher *child = ctx->child; | |
91 | int err, bsize = LRW_BLOCK_SIZE; | |
92 | const u8 *tweak = key + keylen - bsize; | |
64470f1b | 93 | be128 tmp = { 0 }; |
171c0204 | 94 | int i; |
64470f1b | 95 | |
217afccf EB |
96 | crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
97 | crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) & | |
98 | CRYPTO_TFM_REQ_MASK); | |
99 | err = crypto_skcipher_setkey(child, key, keylen - bsize); | |
100 | crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) & | |
101 | CRYPTO_TFM_RES_MASK); | |
102 | if (err) | |
103 | return err; | |
104 | ||
64470f1b RS |
105 | if (ctx->table) |
106 | gf128mul_free_64k(ctx->table); | |
107 | ||
108 | /* initialize multiplication table for Key2 */ | |
171c0204 | 109 | ctx->table = gf128mul_init_64k_bbe((be128 *)tweak); |
64470f1b RS |
110 | if (!ctx->table) |
111 | return -ENOMEM; | |
112 | ||
113 | /* initialize optimization table */ | |
114 | for (i = 0; i < 128; i++) { | |
115 | setbit128_bbe(&tmp, i); | |
116 | ctx->mulinc[i] = tmp; | |
117 | gf128mul_64k_bbe(&ctx->mulinc[i], ctx->table); | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
171c0204 | 122 | |
64470f1b RS |
123 | static inline void inc(be128 *iv) |
124 | { | |
fd4609a8 MS |
125 | be64_add_cpu(&iv->b, 1); |
126 | if (!iv->b) | |
127 | be64_add_cpu(&iv->a, 1); | |
64470f1b RS |
128 | } |
129 | ||
64470f1b RS |
130 | /* this returns the number of consequative 1 bits starting |
131 | * from the right, get_index128(00 00 00 00 00 00 ... 00 00 10 FB) = 2 */ | |
132 | static inline int get_index128(be128 *block) | |
133 | { | |
134 | int x; | |
135 | __be32 *p = (__be32 *) block; | |
136 | ||
137 | for (p += 3, x = 0; x < 128; p--, x += 32) { | |
138 | u32 val = be32_to_cpup(p); | |
139 | ||
140 | if (!~val) | |
141 | continue; | |
142 | ||
143 | return x + ffz(val); | |
144 | } | |
145 | ||
c2ff3949 OM |
146 | /* |
147 | * If we get here, then x == 128 and we are incrementing the counter | |
148 | * from all ones to all zeros. This means we must return index 127, i.e. | |
149 | * the one corresponding to key2*{ 1,...,1 }. | |
150 | */ | |
151 | return 127; | |
64470f1b RS |
152 | } |
153 | ||
700cb3f5 | 154 | static int post_crypt(struct skcipher_request *req) |
64470f1b | 155 | { |
700cb3f5 HX |
156 | struct rctx *rctx = skcipher_request_ctx(req); |
157 | be128 *buf = rctx->ext ?: rctx->buf; | |
158 | struct skcipher_request *subreq; | |
159 | const int bs = LRW_BLOCK_SIZE; | |
160 | struct skcipher_walk w; | |
161 | struct scatterlist *sg; | |
162 | unsigned offset; | |
64470f1b | 163 | int err; |
700cb3f5 HX |
164 | |
165 | subreq = &rctx->subreq; | |
166 | err = skcipher_walk_virt(&w, subreq, false); | |
167 | ||
168 | while (w.nbytes) { | |
169 | unsigned int avail = w.nbytes; | |
170 | be128 *wdst; | |
171 | ||
172 | wdst = w.dst.virt.addr; | |
173 | ||
174 | do { | |
175 | be128_xor(wdst, buf++, wdst); | |
176 | wdst++; | |
177 | } while ((avail -= bs) >= bs); | |
178 | ||
179 | err = skcipher_walk_done(&w, avail); | |
180 | } | |
181 | ||
182 | rctx->left -= subreq->cryptlen; | |
183 | ||
184 | if (err || !rctx->left) | |
185 | goto out; | |
186 | ||
187 | rctx->dst = rctx->dstbuf; | |
188 | ||
189 | scatterwalk_done(&w.out, 0, 1); | |
190 | sg = w.out.sg; | |
191 | offset = w.out.offset; | |
192 | ||
193 | if (rctx->dst != sg) { | |
194 | rctx->dst[0] = *sg; | |
195 | sg_unmark_end(rctx->dst); | |
8c30fbe6 | 196 | scatterwalk_crypto_chain(rctx->dst, sg_next(sg), 2); |
700cb3f5 HX |
197 | } |
198 | rctx->dst[0].length -= offset - sg->offset; | |
199 | rctx->dst[0].offset = offset; | |
200 | ||
201 | out: | |
202 | return err; | |
203 | } | |
204 | ||
205 | static int pre_crypt(struct skcipher_request *req) | |
206 | { | |
207 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
208 | struct rctx *rctx = skcipher_request_ctx(req); | |
209 | struct priv *ctx = crypto_skcipher_ctx(tfm); | |
210 | be128 *buf = rctx->ext ?: rctx->buf; | |
211 | struct skcipher_request *subreq; | |
4660720d | 212 | const int bs = LRW_BLOCK_SIZE; |
700cb3f5 HX |
213 | struct skcipher_walk w; |
214 | struct scatterlist *sg; | |
215 | unsigned cryptlen; | |
216 | unsigned offset; | |
64470f1b | 217 | be128 *iv; |
700cb3f5 HX |
218 | bool more; |
219 | int err; | |
64470f1b | 220 | |
700cb3f5 HX |
221 | subreq = &rctx->subreq; |
222 | skcipher_request_set_tfm(subreq, tfm); | |
64470f1b | 223 | |
700cb3f5 HX |
224 | cryptlen = subreq->cryptlen; |
225 | more = rctx->left > cryptlen; | |
226 | if (!more) | |
227 | cryptlen = rctx->left; | |
64470f1b | 228 | |
700cb3f5 HX |
229 | skcipher_request_set_crypt(subreq, rctx->src, rctx->dst, |
230 | cryptlen, req->iv); | |
64470f1b | 231 | |
700cb3f5 HX |
232 | err = skcipher_walk_virt(&w, subreq, false); |
233 | iv = w.iv; | |
64470f1b | 234 | |
700cb3f5 HX |
235 | while (w.nbytes) { |
236 | unsigned int avail = w.nbytes; | |
237 | be128 *wsrc; | |
238 | be128 *wdst; | |
239 | ||
240 | wsrc = w.src.virt.addr; | |
241 | wdst = w.dst.virt.addr; | |
64470f1b | 242 | |
64470f1b | 243 | do { |
700cb3f5 HX |
244 | *buf++ = rctx->t; |
245 | be128_xor(wdst++, &rctx->t, wsrc++); | |
246 | ||
64470f1b RS |
247 | /* T <- I*Key2, using the optimization |
248 | * discussed in the specification */ | |
700cb3f5 | 249 | be128_xor(&rctx->t, &rctx->t, |
217afccf | 250 | &ctx->mulinc[get_index128(iv)]); |
64470f1b | 251 | inc(iv); |
700cb3f5 | 252 | } while ((avail -= bs) >= bs); |
64470f1b | 253 | |
700cb3f5 HX |
254 | err = skcipher_walk_done(&w, avail); |
255 | } | |
64470f1b | 256 | |
700cb3f5 HX |
257 | skcipher_request_set_tfm(subreq, ctx->child); |
258 | skcipher_request_set_crypt(subreq, rctx->dst, rctx->dst, | |
259 | cryptlen, NULL); | |
64470f1b | 260 | |
700cb3f5 HX |
261 | if (err || !more) |
262 | goto out; | |
263 | ||
264 | rctx->src = rctx->srcbuf; | |
265 | ||
266 | scatterwalk_done(&w.in, 0, 1); | |
267 | sg = w.in.sg; | |
268 | offset = w.in.offset; | |
269 | ||
270 | if (rctx->src != sg) { | |
271 | rctx->src[0] = *sg; | |
272 | sg_unmark_end(rctx->src); | |
8c30fbe6 | 273 | scatterwalk_crypto_chain(rctx->src, sg_next(sg), 2); |
700cb3f5 HX |
274 | } |
275 | rctx->src[0].length -= offset - sg->offset; | |
276 | rctx->src[0].offset = offset; | |
277 | ||
278 | out: | |
279 | return err; | |
280 | } | |
281 | ||
282 | static int init_crypt(struct skcipher_request *req, crypto_completion_t done) | |
283 | { | |
284 | struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); | |
285 | struct rctx *rctx = skcipher_request_ctx(req); | |
286 | struct skcipher_request *subreq; | |
287 | gfp_t gfp; | |
288 | ||
289 | subreq = &rctx->subreq; | |
290 | skcipher_request_set_callback(subreq, req->base.flags, done, req); | |
291 | ||
292 | gfp = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL : | |
293 | GFP_ATOMIC; | |
294 | rctx->ext = NULL; | |
295 | ||
296 | subreq->cryptlen = LRW_BUFFER_SIZE; | |
297 | if (req->cryptlen > LRW_BUFFER_SIZE) { | |
9df0eb18 EB |
298 | unsigned int n = min(req->cryptlen, (unsigned int)PAGE_SIZE); |
299 | ||
300 | rctx->ext = kmalloc(n, gfp); | |
301 | if (rctx->ext) | |
302 | subreq->cryptlen = n; | |
700cb3f5 HX |
303 | } |
304 | ||
305 | rctx->src = req->src; | |
306 | rctx->dst = req->dst; | |
307 | rctx->left = req->cryptlen; | |
308 | ||
309 | /* calculate first value of T */ | |
310 | memcpy(&rctx->t, req->iv, sizeof(rctx->t)); | |
311 | ||
312 | /* T <- I*Key2 */ | |
217afccf | 313 | gf128mul_64k_bbe(&rctx->t, ctx->table); |
64470f1b | 314 | |
700cb3f5 HX |
315 | return 0; |
316 | } | |
317 | ||
318 | static void exit_crypt(struct skcipher_request *req) | |
319 | { | |
320 | struct rctx *rctx = skcipher_request_ctx(req); | |
321 | ||
322 | rctx->left = 0; | |
323 | ||
324 | if (rctx->ext) | |
8c9bdab2 | 325 | kzfree(rctx->ext); |
700cb3f5 HX |
326 | } |
327 | ||
328 | static int do_encrypt(struct skcipher_request *req, int err) | |
329 | { | |
330 | struct rctx *rctx = skcipher_request_ctx(req); | |
331 | struct skcipher_request *subreq; | |
332 | ||
333 | subreq = &rctx->subreq; | |
334 | ||
335 | while (!err && rctx->left) { | |
336 | err = pre_crypt(req) ?: | |
337 | crypto_skcipher_encrypt(subreq) ?: | |
338 | post_crypt(req); | |
339 | ||
4e5b0ad5 | 340 | if (err == -EINPROGRESS || err == -EBUSY) |
700cb3f5 | 341 | return err; |
64470f1b RS |
342 | } |
343 | ||
700cb3f5 | 344 | exit_crypt(req); |
64470f1b RS |
345 | return err; |
346 | } | |
347 | ||
700cb3f5 HX |
348 | static void encrypt_done(struct crypto_async_request *areq, int err) |
349 | { | |
350 | struct skcipher_request *req = areq->data; | |
351 | struct skcipher_request *subreq; | |
352 | struct rctx *rctx; | |
353 | ||
354 | rctx = skcipher_request_ctx(req); | |
4702bbee HX |
355 | |
356 | if (err == -EINPROGRESS) { | |
357 | if (rctx->left != req->cryptlen) | |
358 | return; | |
359 | goto out; | |
360 | } | |
361 | ||
700cb3f5 HX |
362 | subreq = &rctx->subreq; |
363 | subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG; | |
364 | ||
365 | err = do_encrypt(req, err ?: post_crypt(req)); | |
366 | if (rctx->left) | |
367 | return; | |
368 | ||
4702bbee | 369 | out: |
700cb3f5 HX |
370 | skcipher_request_complete(req, err); |
371 | } | |
372 | ||
373 | static int encrypt(struct skcipher_request *req) | |
374 | { | |
375 | return do_encrypt(req, init_crypt(req, encrypt_done)); | |
376 | } | |
377 | ||
378 | static int do_decrypt(struct skcipher_request *req, int err) | |
64470f1b | 379 | { |
700cb3f5 HX |
380 | struct rctx *rctx = skcipher_request_ctx(req); |
381 | struct skcipher_request *subreq; | |
382 | ||
383 | subreq = &rctx->subreq; | |
384 | ||
385 | while (!err && rctx->left) { | |
386 | err = pre_crypt(req) ?: | |
387 | crypto_skcipher_decrypt(subreq) ?: | |
388 | post_crypt(req); | |
389 | ||
4e5b0ad5 | 390 | if (err == -EINPROGRESS || err == -EBUSY) |
700cb3f5 HX |
391 | return err; |
392 | } | |
64470f1b | 393 | |
700cb3f5 HX |
394 | exit_crypt(req); |
395 | return err; | |
64470f1b RS |
396 | } |
397 | ||
700cb3f5 | 398 | static void decrypt_done(struct crypto_async_request *areq, int err) |
64470f1b | 399 | { |
700cb3f5 HX |
400 | struct skcipher_request *req = areq->data; |
401 | struct skcipher_request *subreq; | |
402 | struct rctx *rctx; | |
403 | ||
404 | rctx = skcipher_request_ctx(req); | |
4702bbee HX |
405 | |
406 | if (err == -EINPROGRESS) { | |
407 | if (rctx->left != req->cryptlen) | |
408 | return; | |
409 | goto out; | |
410 | } | |
411 | ||
700cb3f5 HX |
412 | subreq = &rctx->subreq; |
413 | subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG; | |
414 | ||
415 | err = do_decrypt(req, err ?: post_crypt(req)); | |
416 | if (rctx->left) | |
417 | return; | |
64470f1b | 418 | |
4702bbee | 419 | out: |
700cb3f5 HX |
420 | skcipher_request_complete(req, err); |
421 | } | |
422 | ||
423 | static int decrypt(struct skcipher_request *req) | |
424 | { | |
425 | return do_decrypt(req, init_crypt(req, decrypt_done)); | |
64470f1b RS |
426 | } |
427 | ||
700cb3f5 | 428 | static int init_tfm(struct crypto_skcipher *tfm) |
64470f1b | 429 | { |
700cb3f5 HX |
430 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); |
431 | struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst); | |
432 | struct priv *ctx = crypto_skcipher_ctx(tfm); | |
433 | struct crypto_skcipher *cipher; | |
64470f1b | 434 | |
700cb3f5 | 435 | cipher = crypto_spawn_skcipher(spawn); |
2e306ee0 HX |
436 | if (IS_ERR(cipher)) |
437 | return PTR_ERR(cipher); | |
64470f1b | 438 | |
2e306ee0 | 439 | ctx->child = cipher; |
700cb3f5 HX |
440 | |
441 | crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(cipher) + | |
442 | sizeof(struct rctx)); | |
443 | ||
64470f1b RS |
444 | return 0; |
445 | } | |
446 | ||
700cb3f5 | 447 | static void exit_tfm(struct crypto_skcipher *tfm) |
64470f1b | 448 | { |
700cb3f5 | 449 | struct priv *ctx = crypto_skcipher_ctx(tfm); |
171c0204 | 450 | |
217afccf EB |
451 | if (ctx->table) |
452 | gf128mul_free_64k(ctx->table); | |
700cb3f5 HX |
453 | crypto_free_skcipher(ctx->child); |
454 | } | |
455 | ||
456 | static void free(struct skcipher_instance *inst) | |
457 | { | |
458 | crypto_drop_skcipher(skcipher_instance_ctx(inst)); | |
459 | kfree(inst); | |
64470f1b RS |
460 | } |
461 | ||
700cb3f5 | 462 | static int create(struct crypto_template *tmpl, struct rtattr **tb) |
64470f1b | 463 | { |
700cb3f5 HX |
464 | struct crypto_skcipher_spawn *spawn; |
465 | struct skcipher_instance *inst; | |
466 | struct crypto_attr_type *algt; | |
467 | struct skcipher_alg *alg; | |
468 | const char *cipher_name; | |
469 | char ecb_name[CRYPTO_MAX_ALG_NAME]; | |
ebc610e5 HX |
470 | int err; |
471 | ||
700cb3f5 HX |
472 | algt = crypto_get_attr_type(tb); |
473 | if (IS_ERR(algt)) | |
474 | return PTR_ERR(algt); | |
475 | ||
476 | if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) | |
477 | return -EINVAL; | |
478 | ||
479 | cipher_name = crypto_attr_alg_name(tb[1]); | |
480 | if (IS_ERR(cipher_name)) | |
481 | return PTR_ERR(cipher_name); | |
482 | ||
483 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
484 | if (!inst) | |
485 | return -ENOMEM; | |
486 | ||
487 | spawn = skcipher_instance_ctx(inst); | |
488 | ||
489 | crypto_set_skcipher_spawn(spawn, skcipher_crypto_instance(inst)); | |
490 | err = crypto_grab_skcipher(spawn, cipher_name, 0, | |
491 | crypto_requires_sync(algt->type, | |
492 | algt->mask)); | |
493 | if (err == -ENOENT) { | |
494 | err = -ENAMETOOLONG; | |
495 | if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)", | |
496 | cipher_name) >= CRYPTO_MAX_ALG_NAME) | |
497 | goto err_free_inst; | |
498 | ||
499 | err = crypto_grab_skcipher(spawn, ecb_name, 0, | |
500 | crypto_requires_sync(algt->type, | |
501 | algt->mask)); | |
502 | } | |
503 | ||
ebc610e5 | 504 | if (err) |
700cb3f5 | 505 | goto err_free_inst; |
64470f1b | 506 | |
700cb3f5 | 507 | alg = crypto_skcipher_spawn_alg(spawn); |
64470f1b | 508 | |
700cb3f5 HX |
509 | err = -EINVAL; |
510 | if (alg->base.cra_blocksize != LRW_BLOCK_SIZE) | |
511 | goto err_drop_spawn; | |
64470f1b | 512 | |
700cb3f5 HX |
513 | if (crypto_skcipher_alg_ivsize(alg)) |
514 | goto err_drop_spawn; | |
64470f1b | 515 | |
700cb3f5 HX |
516 | err = crypto_inst_setname(skcipher_crypto_instance(inst), "lrw", |
517 | &alg->base); | |
518 | if (err) | |
519 | goto err_drop_spawn; | |
64470f1b | 520 | |
700cb3f5 HX |
521 | err = -EINVAL; |
522 | cipher_name = alg->base.cra_name; | |
64470f1b | 523 | |
700cb3f5 HX |
524 | /* Alas we screwed up the naming so we have to mangle the |
525 | * cipher name. | |
526 | */ | |
527 | if (!strncmp(cipher_name, "ecb(", 4)) { | |
528 | unsigned len; | |
64470f1b | 529 | |
700cb3f5 HX |
530 | len = strlcpy(ecb_name, cipher_name + 4, sizeof(ecb_name)); |
531 | if (len < 2 || len >= sizeof(ecb_name)) | |
532 | goto err_drop_spawn; | |
64470f1b | 533 | |
700cb3f5 HX |
534 | if (ecb_name[len - 1] != ')') |
535 | goto err_drop_spawn; | |
64470f1b | 536 | |
700cb3f5 | 537 | ecb_name[len - 1] = 0; |
64470f1b | 538 | |
700cb3f5 | 539 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
616129cc CJ |
540 | "lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME) { |
541 | err = -ENAMETOOLONG; | |
542 | goto err_drop_spawn; | |
543 | } | |
d38efad2 CJ |
544 | } else |
545 | goto err_drop_spawn; | |
700cb3f5 HX |
546 | |
547 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; | |
548 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
549 | inst->alg.base.cra_blocksize = LRW_BLOCK_SIZE; | |
550 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask | | |
551 | (__alignof__(u64) - 1); | |
552 | ||
553 | inst->alg.ivsize = LRW_BLOCK_SIZE; | |
554 | inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) + | |
555 | LRW_BLOCK_SIZE; | |
556 | inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) + | |
557 | LRW_BLOCK_SIZE; | |
558 | ||
559 | inst->alg.base.cra_ctxsize = sizeof(struct priv); | |
560 | ||
561 | inst->alg.init = init_tfm; | |
562 | inst->alg.exit = exit_tfm; | |
563 | ||
564 | inst->alg.setkey = setkey; | |
565 | inst->alg.encrypt = encrypt; | |
566 | inst->alg.decrypt = decrypt; | |
567 | ||
568 | inst->free = free; | |
569 | ||
570 | err = skcipher_register_instance(tmpl, inst); | |
571 | if (err) | |
572 | goto err_drop_spawn; | |
573 | ||
574 | out: | |
575 | return err; | |
576 | ||
577 | err_drop_spawn: | |
578 | crypto_drop_skcipher(spawn); | |
579 | err_free_inst: | |
64470f1b | 580 | kfree(inst); |
700cb3f5 | 581 | goto out; |
64470f1b RS |
582 | } |
583 | ||
584 | static struct crypto_template crypto_tmpl = { | |
585 | .name = "lrw", | |
700cb3f5 | 586 | .create = create, |
64470f1b RS |
587 | .module = THIS_MODULE, |
588 | }; | |
589 | ||
590 | static int __init crypto_module_init(void) | |
591 | { | |
592 | return crypto_register_template(&crypto_tmpl); | |
593 | } | |
594 | ||
595 | static void __exit crypto_module_exit(void) | |
596 | { | |
597 | crypto_unregister_template(&crypto_tmpl); | |
598 | } | |
599 | ||
600 | module_init(crypto_module_init); | |
601 | module_exit(crypto_module_exit); | |
602 | ||
603 | MODULE_LICENSE("GPL"); | |
604 | MODULE_DESCRIPTION("LRW block cipher mode"); | |
4943ba16 | 605 | MODULE_ALIAS_CRYPTO("lrw"); |