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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * Cipher operations. | |
5 | * | |
6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
c774e93e | 7 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
1da177e4 LT |
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 | #include <linux/compiler.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/crypto.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/string.h> | |
22 | #include <asm/scatterlist.h> | |
23 | #include "internal.h" | |
24 | #include "scatterwalk.h" | |
25 | ||
1da177e4 LT |
26 | static inline void xor_64(u8 *a, const u8 *b) |
27 | { | |
28 | ((u32 *)a)[0] ^= ((u32 *)b)[0]; | |
29 | ((u32 *)a)[1] ^= ((u32 *)b)[1]; | |
30 | } | |
31 | ||
32 | static inline void xor_128(u8 *a, const u8 *b) | |
33 | { | |
34 | ((u32 *)a)[0] ^= ((u32 *)b)[0]; | |
35 | ((u32 *)a)[1] ^= ((u32 *)b)[1]; | |
36 | ((u32 *)a)[2] ^= ((u32 *)b)[2]; | |
37 | ((u32 *)a)[3] ^= ((u32 *)b)[3]; | |
38 | } | |
c774e93e HX |
39 | |
40 | static unsigned int crypt_slow(const struct cipher_desc *desc, | |
41 | struct scatter_walk *in, | |
42 | struct scatter_walk *out, unsigned int bsize) | |
1da177e4 | 43 | { |
9d853c37 | 44 | unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm); |
95477377 HX |
45 | u8 buffer[bsize * 2 + alignmask]; |
46 | u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
47 | u8 *dst = src + bsize; | |
1da177e4 | 48 | |
5c64097a | 49 | scatterwalk_copychunks(src, in, bsize, 0); |
c774e93e | 50 | desc->prfn(desc, dst, src, bsize); |
5c64097a | 51 | scatterwalk_copychunks(dst, out, bsize, 1); |
1da177e4 | 52 | |
c774e93e | 53 | return bsize; |
1da177e4 LT |
54 | } |
55 | ||
c774e93e HX |
56 | static inline unsigned int crypt_fast(const struct cipher_desc *desc, |
57 | struct scatter_walk *in, | |
58 | struct scatter_walk *out, | |
95477377 | 59 | unsigned int nbytes, u8 *tmp) |
1da177e4 | 60 | { |
c774e93e | 61 | u8 *src, *dst; |
5c64097a HX |
62 | u8 *real_src, *real_dst; |
63 | ||
64 | real_src = scatterwalk_map(in, 0); | |
65 | real_dst = scatterwalk_map(out, 1); | |
c774e93e | 66 | |
5c64097a HX |
67 | src = real_src; |
68 | dst = scatterwalk_samebuf(in, out) ? src : real_dst; | |
c774e93e | 69 | |
95477377 | 70 | if (tmp) { |
5c64097a | 71 | memcpy(tmp, src, nbytes); |
95477377 HX |
72 | src = tmp; |
73 | dst = tmp; | |
74 | } | |
75 | ||
c774e93e HX |
76 | nbytes = desc->prfn(desc, dst, src, nbytes); |
77 | ||
95477377 | 78 | if (tmp) |
5c64097a HX |
79 | memcpy(real_dst, tmp, nbytes); |
80 | ||
81 | scatterwalk_unmap(real_src, 0); | |
82 | scatterwalk_unmap(real_dst, 1); | |
95477377 | 83 | |
c774e93e HX |
84 | scatterwalk_advance(in, nbytes); |
85 | scatterwalk_advance(out, nbytes); | |
1da177e4 | 86 | |
c774e93e | 87 | return nbytes; |
1da177e4 LT |
88 | } |
89 | ||
90 | /* | |
91 | * Generic encrypt/decrypt wrapper for ciphers, handles operations across | |
92 | * multiple page boundaries by using temporary blocks. In user context, | |
c774e93e | 93 | * the kernel is given a chance to schedule us once per page. |
1da177e4 | 94 | */ |
c774e93e | 95 | static int crypt(const struct cipher_desc *desc, |
1da177e4 LT |
96 | struct scatterlist *dst, |
97 | struct scatterlist *src, | |
c774e93e | 98 | unsigned int nbytes) |
1da177e4 LT |
99 | { |
100 | struct scatter_walk walk_in, walk_out; | |
c774e93e | 101 | struct crypto_tfm *tfm = desc->tfm; |
1da177e4 | 102 | const unsigned int bsize = crypto_tfm_alg_blocksize(tfm); |
fbdae9f3 | 103 | unsigned int alignmask = crypto_tfm_alg_alignmask(tfm); |
95477377 | 104 | unsigned long buffer = 0; |
1da177e4 LT |
105 | |
106 | if (!nbytes) | |
107 | return 0; | |
108 | ||
109 | if (nbytes % bsize) { | |
110 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | scatterwalk_start(&walk_in, src); | |
115 | scatterwalk_start(&walk_out, dst); | |
116 | ||
117 | for(;;) { | |
95477377 HX |
118 | unsigned int n = nbytes; |
119 | u8 *tmp = NULL; | |
120 | ||
121 | if (!scatterwalk_aligned(&walk_in, alignmask) || | |
122 | !scatterwalk_aligned(&walk_out, alignmask)) { | |
123 | if (!buffer) { | |
124 | buffer = __get_free_page(GFP_ATOMIC); | |
125 | if (!buffer) | |
126 | n = 0; | |
127 | } | |
128 | tmp = (u8 *)buffer; | |
129 | } | |
1da177e4 | 130 | |
95477377 | 131 | n = scatterwalk_clamp(&walk_in, n); |
c774e93e | 132 | n = scatterwalk_clamp(&walk_out, n); |
1da177e4 | 133 | |
c774e93e | 134 | if (likely(n >= bsize)) |
95477377 | 135 | n = crypt_fast(desc, &walk_in, &walk_out, n, tmp); |
c774e93e HX |
136 | else |
137 | n = crypt_slow(desc, &walk_in, &walk_out, bsize); | |
1da177e4 | 138 | |
c774e93e | 139 | nbytes -= n; |
1da177e4 LT |
140 | |
141 | scatterwalk_done(&walk_in, 0, nbytes); | |
142 | scatterwalk_done(&walk_out, 1, nbytes); | |
143 | ||
144 | if (!nbytes) | |
95477377 | 145 | break; |
1da177e4 | 146 | |
8f21cf0d | 147 | crypto_yield(tfm->crt_flags); |
1da177e4 | 148 | } |
95477377 HX |
149 | |
150 | if (buffer) | |
151 | free_page(buffer); | |
152 | ||
153 | return 0; | |
1da177e4 LT |
154 | } |
155 | ||
915e8561 HX |
156 | static int crypt_iv_unaligned(struct cipher_desc *desc, |
157 | struct scatterlist *dst, | |
158 | struct scatterlist *src, | |
159 | unsigned int nbytes) | |
160 | { | |
161 | struct crypto_tfm *tfm = desc->tfm; | |
9d853c37 | 162 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
915e8561 HX |
163 | u8 *iv = desc->info; |
164 | ||
165 | if (unlikely(((unsigned long)iv & alignmask))) { | |
166 | unsigned int ivsize = tfm->crt_cipher.cit_ivsize; | |
167 | u8 buffer[ivsize + alignmask]; | |
168 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
169 | int err; | |
170 | ||
171 | desc->info = memcpy(tmp, iv, ivsize); | |
172 | err = crypt(desc, dst, src, nbytes); | |
173 | memcpy(iv, tmp, ivsize); | |
174 | ||
175 | return err; | |
176 | } | |
177 | ||
178 | return crypt(desc, dst, src, nbytes); | |
179 | } | |
180 | ||
c774e93e HX |
181 | static unsigned int cbc_process_encrypt(const struct cipher_desc *desc, |
182 | u8 *dst, const u8 *src, | |
183 | unsigned int nbytes) | |
1da177e4 | 184 | { |
c774e93e HX |
185 | struct crypto_tfm *tfm = desc->tfm; |
186 | void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block; | |
187 | int bsize = crypto_tfm_alg_blocksize(tfm); | |
188 | ||
6c2bb98b | 189 | void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn; |
c774e93e HX |
190 | u8 *iv = desc->info; |
191 | unsigned int done = 0; | |
192 | ||
fe2d5295 HX |
193 | nbytes -= bsize; |
194 | ||
c774e93e HX |
195 | do { |
196 | xor(iv, src); | |
6c2bb98b | 197 | fn(tfm, dst, iv); |
c774e93e | 198 | memcpy(iv, dst, bsize); |
1da177e4 | 199 | |
c774e93e HX |
200 | src += bsize; |
201 | dst += bsize; | |
fe2d5295 | 202 | } while ((done += bsize) <= nbytes); |
c774e93e HX |
203 | |
204 | return done; | |
1da177e4 LT |
205 | } |
206 | ||
c774e93e HX |
207 | static unsigned int cbc_process_decrypt(const struct cipher_desc *desc, |
208 | u8 *dst, const u8 *src, | |
209 | unsigned int nbytes) | |
1da177e4 | 210 | { |
c774e93e HX |
211 | struct crypto_tfm *tfm = desc->tfm; |
212 | void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block; | |
213 | int bsize = crypto_tfm_alg_blocksize(tfm); | |
827c3911 | 214 | unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm); |
c774e93e | 215 | |
827c3911 HX |
216 | u8 stack[src == dst ? bsize + alignmask : 0]; |
217 | u8 *buf = (u8 *)ALIGN((unsigned long)stack, alignmask + 1); | |
c774e93e HX |
218 | u8 **dst_p = src == dst ? &buf : &dst; |
219 | ||
6c2bb98b | 220 | void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn; |
c774e93e HX |
221 | u8 *iv = desc->info; |
222 | unsigned int done = 0; | |
223 | ||
fe2d5295 HX |
224 | nbytes -= bsize; |
225 | ||
c774e93e HX |
226 | do { |
227 | u8 *tmp_dst = *dst_p; | |
1da177e4 | 228 | |
6c2bb98b | 229 | fn(tfm, tmp_dst, src); |
c774e93e HX |
230 | xor(tmp_dst, iv); |
231 | memcpy(iv, src, bsize); | |
232 | if (tmp_dst != dst) | |
233 | memcpy(dst, tmp_dst, bsize); | |
234 | ||
235 | src += bsize; | |
236 | dst += bsize; | |
fe2d5295 | 237 | } while ((done += bsize) <= nbytes); |
c774e93e HX |
238 | |
239 | return done; | |
1da177e4 LT |
240 | } |
241 | ||
c774e93e HX |
242 | static unsigned int ecb_process(const struct cipher_desc *desc, u8 *dst, |
243 | const u8 *src, unsigned int nbytes) | |
1da177e4 | 244 | { |
c774e93e HX |
245 | struct crypto_tfm *tfm = desc->tfm; |
246 | int bsize = crypto_tfm_alg_blocksize(tfm); | |
6c2bb98b | 247 | void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn; |
c774e93e HX |
248 | unsigned int done = 0; |
249 | ||
fe2d5295 HX |
250 | nbytes -= bsize; |
251 | ||
c774e93e | 252 | do { |
6c2bb98b | 253 | fn(tfm, dst, src); |
c774e93e HX |
254 | |
255 | src += bsize; | |
256 | dst += bsize; | |
fe2d5295 | 257 | } while ((done += bsize) <= nbytes); |
c774e93e HX |
258 | |
259 | return done; | |
1da177e4 LT |
260 | } |
261 | ||
262 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) | |
263 | { | |
264 | struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher; | |
265 | ||
560c06ae | 266 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; |
1da177e4 LT |
267 | if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) { |
268 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
269 | return -EINVAL; | |
270 | } else | |
560c06ae | 271 | return cia->cia_setkey(tfm, key, keylen); |
1da177e4 LT |
272 | } |
273 | ||
274 | static int ecb_encrypt(struct crypto_tfm *tfm, | |
275 | struct scatterlist *dst, | |
276 | struct scatterlist *src, unsigned int nbytes) | |
277 | { | |
c774e93e | 278 | struct cipher_desc desc; |
40725181 | 279 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
c774e93e HX |
280 | |
281 | desc.tfm = tfm; | |
40725181 HX |
282 | desc.crfn = cipher->cia_encrypt; |
283 | desc.prfn = cipher->cia_encrypt_ecb ?: ecb_process; | |
c774e93e HX |
284 | |
285 | return crypt(&desc, dst, src, nbytes); | |
1da177e4 LT |
286 | } |
287 | ||
288 | static int ecb_decrypt(struct crypto_tfm *tfm, | |
289 | struct scatterlist *dst, | |
290 | struct scatterlist *src, | |
291 | unsigned int nbytes) | |
292 | { | |
c774e93e | 293 | struct cipher_desc desc; |
40725181 | 294 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
c774e93e HX |
295 | |
296 | desc.tfm = tfm; | |
40725181 HX |
297 | desc.crfn = cipher->cia_decrypt; |
298 | desc.prfn = cipher->cia_decrypt_ecb ?: ecb_process; | |
c774e93e HX |
299 | |
300 | return crypt(&desc, dst, src, nbytes); | |
1da177e4 LT |
301 | } |
302 | ||
303 | static int cbc_encrypt(struct crypto_tfm *tfm, | |
304 | struct scatterlist *dst, | |
305 | struct scatterlist *src, | |
306 | unsigned int nbytes) | |
307 | { | |
c774e93e | 308 | struct cipher_desc desc; |
40725181 | 309 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
c774e93e HX |
310 | |
311 | desc.tfm = tfm; | |
40725181 HX |
312 | desc.crfn = cipher->cia_encrypt; |
313 | desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt; | |
c774e93e HX |
314 | desc.info = tfm->crt_cipher.cit_iv; |
315 | ||
316 | return crypt(&desc, dst, src, nbytes); | |
1da177e4 LT |
317 | } |
318 | ||
319 | static int cbc_encrypt_iv(struct crypto_tfm *tfm, | |
320 | struct scatterlist *dst, | |
321 | struct scatterlist *src, | |
322 | unsigned int nbytes, u8 *iv) | |
323 | { | |
c774e93e | 324 | struct cipher_desc desc; |
40725181 | 325 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
c774e93e HX |
326 | |
327 | desc.tfm = tfm; | |
40725181 HX |
328 | desc.crfn = cipher->cia_encrypt; |
329 | desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt; | |
c774e93e HX |
330 | desc.info = iv; |
331 | ||
915e8561 | 332 | return crypt_iv_unaligned(&desc, dst, src, nbytes); |
1da177e4 LT |
333 | } |
334 | ||
335 | static int cbc_decrypt(struct crypto_tfm *tfm, | |
336 | struct scatterlist *dst, | |
337 | struct scatterlist *src, | |
338 | unsigned int nbytes) | |
339 | { | |
c774e93e | 340 | struct cipher_desc desc; |
40725181 | 341 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
c774e93e HX |
342 | |
343 | desc.tfm = tfm; | |
40725181 HX |
344 | desc.crfn = cipher->cia_decrypt; |
345 | desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt; | |
c774e93e HX |
346 | desc.info = tfm->crt_cipher.cit_iv; |
347 | ||
348 | return crypt(&desc, dst, src, nbytes); | |
1da177e4 LT |
349 | } |
350 | ||
351 | static int cbc_decrypt_iv(struct crypto_tfm *tfm, | |
352 | struct scatterlist *dst, | |
353 | struct scatterlist *src, | |
354 | unsigned int nbytes, u8 *iv) | |
355 | { | |
c774e93e | 356 | struct cipher_desc desc; |
40725181 | 357 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
c774e93e HX |
358 | |
359 | desc.tfm = tfm; | |
40725181 HX |
360 | desc.crfn = cipher->cia_decrypt; |
361 | desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt; | |
c774e93e HX |
362 | desc.info = iv; |
363 | ||
915e8561 | 364 | return crypt_iv_unaligned(&desc, dst, src, nbytes); |
1da177e4 LT |
365 | } |
366 | ||
367 | static int nocrypt(struct crypto_tfm *tfm, | |
368 | struct scatterlist *dst, | |
369 | struct scatterlist *src, | |
370 | unsigned int nbytes) | |
371 | { | |
372 | return -ENOSYS; | |
373 | } | |
374 | ||
375 | static int nocrypt_iv(struct crypto_tfm *tfm, | |
376 | struct scatterlist *dst, | |
377 | struct scatterlist *src, | |
378 | unsigned int nbytes, u8 *iv) | |
379 | { | |
380 | return -ENOSYS; | |
381 | } | |
382 | ||
383 | int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags) | |
384 | { | |
385 | u32 mode = flags & CRYPTO_TFM_MODE_MASK; | |
1da177e4 | 386 | tfm->crt_cipher.cit_mode = mode ? mode : CRYPTO_TFM_MODE_ECB; |
1da177e4 LT |
387 | return 0; |
388 | } | |
389 | ||
f28776a3 HX |
390 | static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *, |
391 | const u8 *), | |
392 | struct crypto_tfm *tfm, | |
393 | u8 *dst, const u8 *src) | |
394 | { | |
395 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
396 | unsigned int size = crypto_tfm_alg_blocksize(tfm); | |
397 | u8 buffer[size + alignmask]; | |
398 | u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
399 | ||
400 | memcpy(tmp, src, size); | |
401 | fn(tfm, tmp, tmp); | |
402 | memcpy(dst, tmp, size); | |
403 | } | |
404 | ||
405 | static void cipher_encrypt_unaligned(struct crypto_tfm *tfm, | |
406 | u8 *dst, const u8 *src) | |
407 | { | |
408 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
409 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
410 | ||
411 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
412 | cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src); | |
413 | return; | |
414 | } | |
415 | ||
416 | cipher->cia_encrypt(tfm, dst, src); | |
417 | } | |
418 | ||
419 | static void cipher_decrypt_unaligned(struct crypto_tfm *tfm, | |
420 | u8 *dst, const u8 *src) | |
421 | { | |
422 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
423 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; | |
424 | ||
425 | if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { | |
426 | cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src); | |
427 | return; | |
428 | } | |
429 | ||
430 | cipher->cia_decrypt(tfm, dst, src); | |
431 | } | |
432 | ||
1da177e4 LT |
433 | int crypto_init_cipher_ops(struct crypto_tfm *tfm) |
434 | { | |
435 | int ret = 0; | |
436 | struct cipher_tfm *ops = &tfm->crt_cipher; | |
f28776a3 | 437 | struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher; |
1da177e4 LT |
438 | |
439 | ops->cit_setkey = setkey; | |
f28776a3 HX |
440 | ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ? |
441 | cipher_encrypt_unaligned : cipher->cia_encrypt; | |
442 | ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ? | |
443 | cipher_decrypt_unaligned : cipher->cia_decrypt; | |
1da177e4 LT |
444 | |
445 | switch (tfm->crt_cipher.cit_mode) { | |
446 | case CRYPTO_TFM_MODE_ECB: | |
447 | ops->cit_encrypt = ecb_encrypt; | |
448 | ops->cit_decrypt = ecb_decrypt; | |
df89820e HX |
449 | ops->cit_encrypt_iv = nocrypt_iv; |
450 | ops->cit_decrypt_iv = nocrypt_iv; | |
1da177e4 LT |
451 | break; |
452 | ||
453 | case CRYPTO_TFM_MODE_CBC: | |
454 | ops->cit_encrypt = cbc_encrypt; | |
455 | ops->cit_decrypt = cbc_decrypt; | |
456 | ops->cit_encrypt_iv = cbc_encrypt_iv; | |
457 | ops->cit_decrypt_iv = cbc_decrypt_iv; | |
458 | break; | |
459 | ||
460 | case CRYPTO_TFM_MODE_CFB: | |
461 | ops->cit_encrypt = nocrypt; | |
462 | ops->cit_decrypt = nocrypt; | |
463 | ops->cit_encrypt_iv = nocrypt_iv; | |
464 | ops->cit_decrypt_iv = nocrypt_iv; | |
465 | break; | |
466 | ||
467 | case CRYPTO_TFM_MODE_CTR: | |
468 | ops->cit_encrypt = nocrypt; | |
469 | ops->cit_decrypt = nocrypt; | |
470 | ops->cit_encrypt_iv = nocrypt_iv; | |
471 | ops->cit_decrypt_iv = nocrypt_iv; | |
472 | break; | |
473 | ||
474 | default: | |
475 | BUG(); | |
476 | } | |
477 | ||
478 | if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) { | |
9d853c37 | 479 | unsigned long align; |
fbdae9f3 | 480 | unsigned long addr; |
1da177e4 LT |
481 | |
482 | switch (crypto_tfm_alg_blocksize(tfm)) { | |
483 | case 8: | |
484 | ops->cit_xor_block = xor_64; | |
485 | break; | |
486 | ||
487 | case 16: | |
488 | ops->cit_xor_block = xor_128; | |
489 | break; | |
490 | ||
491 | default: | |
492 | printk(KERN_WARNING "%s: block size %u not supported\n", | |
493 | crypto_tfm_alg_name(tfm), | |
494 | crypto_tfm_alg_blocksize(tfm)); | |
495 | ret = -EINVAL; | |
496 | goto out; | |
497 | } | |
498 | ||
499 | ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm); | |
fbdae9f3 HX |
500 | align = crypto_tfm_alg_alignmask(tfm) + 1; |
501 | addr = (unsigned long)crypto_tfm_ctx(tfm); | |
502 | addr = ALIGN(addr, align); | |
503 | addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
504 | ops->cit_iv = (void *)addr; | |
1da177e4 LT |
505 | } |
506 | ||
507 | out: | |
508 | return ret; | |
509 | } | |
510 | ||
511 | void crypto_exit_cipher_ops(struct crypto_tfm *tfm) | |
512 | { | |
1da177e4 | 513 | } |