1 /* 1 /*
2 * CTS: Cipher Text Stealing mode 2 * CTS: Cipher Text Stealing mode
3 * 3 *
4 * COPYRIGHT (c) 2008 4 * COPYRIGHT (c) 2008
5 * The Regents of the University of Michigan 5 * The Regents of the University of Michigan
6 * ALL RIGHTS RESERVED 6 * ALL RIGHTS RESERVED
7 * 7 *
8 * Permission is granted to use, copy, create 8 * Permission is granted to use, copy, create derivative works
9 * and redistribute this software and such der 9 * and redistribute this software and such derivative works
10 * for any purpose, so long as the name of The 10 * for any purpose, so long as the name of The University of
11 * Michigan is not used in any advertising or 11 * Michigan is not used in any advertising or publicity
12 * pertaining to the use of distribution of th 12 * pertaining to the use of distribution of this software
13 * without specific, written prior authorizati 13 * without specific, written prior authorization. If the
14 * above copyright notice or any other identif 14 * above copyright notice or any other identification of the
15 * University of Michigan is included in any c 15 * University of Michigan is included in any copy of any
16 * portion of this software, then the disclaim 16 * portion of this software, then the disclaimer below must
17 * also be included. 17 * also be included.
18 * 18 *
19 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT RE 19 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
20 * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS F 20 * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
21 * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVER 21 * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
22 * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMP 22 * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
23 * WITHOUT LIMITATION THE IMPLIED WARRANTIES O 23 * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULA 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
25 * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL 25 * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
26 * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIREC 26 * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
27 * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY 27 * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OF THE 28 * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
29 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF T 29 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGES. 30 * SUCH DAMAGES.
31 */ 31 */
32 32
33 /* Derived from various: 33 /* Derived from various:
34 * Copyright (c) 2006 Herbert Xu <herbert 34 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
35 */ 35 */
36 36
37 /* 37 /*
38 * This is the Cipher Text Stealing mode as de 38 * This is the Cipher Text Stealing mode as described by
39 * Section 8 of rfc2040 and referenced by rfc3 39 * Section 8 of rfc2040 and referenced by rfc3962.
40 * rfc3962 includes errata information in its 40 * rfc3962 includes errata information in its Appendix A.
41 */ 41 */
42 42
43 #include <crypto/algapi.h> 43 #include <crypto/algapi.h>
44 #include <crypto/internal/skcipher.h> 44 #include <crypto/internal/skcipher.h>
45 #include <linux/err.h> 45 #include <linux/err.h>
46 #include <linux/init.h> 46 #include <linux/init.h>
47 #include <linux/kernel.h> 47 #include <linux/kernel.h>
48 #include <linux/log2.h> 48 #include <linux/log2.h>
49 #include <linux/module.h> 49 #include <linux/module.h>
50 #include <linux/scatterlist.h> 50 #include <linux/scatterlist.h>
51 #include <crypto/scatterwalk.h> 51 #include <crypto/scatterwalk.h>
52 #include <linux/slab.h> 52 #include <linux/slab.h>
53 #include <linux/compiler.h> 53 #include <linux/compiler.h>
54 54
55 struct crypto_cts_ctx { 55 struct crypto_cts_ctx {
56 struct crypto_skcipher *child; 56 struct crypto_skcipher *child;
57 }; 57 };
58 58
59 struct crypto_cts_reqctx { 59 struct crypto_cts_reqctx {
60 struct scatterlist sg[2]; 60 struct scatterlist sg[2];
61 unsigned offset; 61 unsigned offset;
62 struct skcipher_request subreq; 62 struct skcipher_request subreq;
63 }; 63 };
64 64
65 static inline u8 *crypto_cts_reqctx_space(stru 65 static inline u8 *crypto_cts_reqctx_space(struct skcipher_request *req)
66 { 66 {
67 struct crypto_cts_reqctx *rctx = skcip 67 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
68 struct crypto_skcipher *tfm = crypto_s 68 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
69 struct crypto_cts_ctx *ctx = crypto_sk 69 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
70 struct crypto_skcipher *child = ctx->c 70 struct crypto_skcipher *child = ctx->child;
71 71
72 return PTR_ALIGN((u8 *)(rctx + 1) + cr 72 return PTR_ALIGN((u8 *)(rctx + 1) + crypto_skcipher_reqsize(child),
73 crypto_skcipher_align 73 crypto_skcipher_alignmask(tfm) + 1);
74 } 74 }
75 75
76 static int crypto_cts_setkey(struct crypto_skc 76 static int crypto_cts_setkey(struct crypto_skcipher *parent, const u8 *key,
77 unsigned int keyl 77 unsigned int keylen)
78 { 78 {
79 struct crypto_cts_ctx *ctx = crypto_sk 79 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(parent);
80 struct crypto_skcipher *child = ctx->c 80 struct crypto_skcipher *child = ctx->child;
81 81
82 crypto_skcipher_clear_flags(child, CRY 82 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
83 crypto_skcipher_set_flags(child, crypt 83 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
84 CRYPT 84 CRYPTO_TFM_REQ_MASK);
85 return crypto_skcipher_setkey(child, k 85 return crypto_skcipher_setkey(child, key, keylen);
86 } 86 }
87 87
88 static void cts_cbc_crypt_done(void *data, int 88 static void cts_cbc_crypt_done(void *data, int err)
89 { 89 {
90 struct skcipher_request *req = data; 90 struct skcipher_request *req = data;
91 91
92 if (err == -EINPROGRESS) 92 if (err == -EINPROGRESS)
93 return; 93 return;
94 94
95 skcipher_request_complete(req, err); 95 skcipher_request_complete(req, err);
96 } 96 }
97 97
98 static int cts_cbc_encrypt(struct skcipher_req 98 static int cts_cbc_encrypt(struct skcipher_request *req)
99 { 99 {
100 struct crypto_cts_reqctx *rctx = skcip 100 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
101 struct crypto_skcipher *tfm = crypto_s 101 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
102 struct skcipher_request *subreq = &rct 102 struct skcipher_request *subreq = &rctx->subreq;
103 int bsize = crypto_skcipher_blocksize( 103 int bsize = crypto_skcipher_blocksize(tfm);
104 u8 d[MAX_CIPHER_BLOCKSIZE * 2] __align 104 u8 d[MAX_CIPHER_BLOCKSIZE * 2] __aligned(__alignof__(u32));
105 struct scatterlist *sg; 105 struct scatterlist *sg;
106 unsigned int offset; 106 unsigned int offset;
107 int lastn; 107 int lastn;
108 108
109 offset = rctx->offset; 109 offset = rctx->offset;
110 lastn = req->cryptlen - offset; 110 lastn = req->cryptlen - offset;
111 111
112 sg = scatterwalk_ffwd(rctx->sg, req->d 112 sg = scatterwalk_ffwd(rctx->sg, req->dst, offset - bsize);
113 scatterwalk_map_and_copy(d + bsize, sg 113 scatterwalk_map_and_copy(d + bsize, sg, 0, bsize, 0);
114 114
115 memset(d, 0, bsize); 115 memset(d, 0, bsize);
116 scatterwalk_map_and_copy(d, req->src, 116 scatterwalk_map_and_copy(d, req->src, offset, lastn, 0);
117 117
118 scatterwalk_map_and_copy(d, sg, 0, bsi 118 scatterwalk_map_and_copy(d, sg, 0, bsize + lastn, 1);
119 memzero_explicit(d, sizeof(d)); 119 memzero_explicit(d, sizeof(d));
120 120
121 skcipher_request_set_callback(subreq, 121 skcipher_request_set_callback(subreq, req->base.flags &
122 122 CRYPTO_TFM_REQ_MAY_BACKLOG,
123 cts_cbc_ 123 cts_cbc_crypt_done, req);
124 skcipher_request_set_crypt(subreq, sg, 124 skcipher_request_set_crypt(subreq, sg, sg, bsize, req->iv);
125 return crypto_skcipher_encrypt(subreq) 125 return crypto_skcipher_encrypt(subreq);
126 } 126 }
127 127
128 static void crypto_cts_encrypt_done(void *data 128 static void crypto_cts_encrypt_done(void *data, int err)
129 { 129 {
130 struct skcipher_request *req = data; 130 struct skcipher_request *req = data;
131 131
132 if (err) 132 if (err)
133 goto out; 133 goto out;
134 134
135 err = cts_cbc_encrypt(req); 135 err = cts_cbc_encrypt(req);
136 if (err == -EINPROGRESS || err == -EBU 136 if (err == -EINPROGRESS || err == -EBUSY)
137 return; 137 return;
138 138
139 out: 139 out:
140 skcipher_request_complete(req, err); 140 skcipher_request_complete(req, err);
141 } 141 }
142 142
143 static int crypto_cts_encrypt(struct skcipher_ 143 static int crypto_cts_encrypt(struct skcipher_request *req)
144 { 144 {
145 struct crypto_skcipher *tfm = crypto_s 145 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
146 struct crypto_cts_reqctx *rctx = skcip 146 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
147 struct crypto_cts_ctx *ctx = crypto_sk 147 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
148 struct skcipher_request *subreq = &rct 148 struct skcipher_request *subreq = &rctx->subreq;
149 int bsize = crypto_skcipher_blocksize( 149 int bsize = crypto_skcipher_blocksize(tfm);
150 unsigned int nbytes = req->cryptlen; 150 unsigned int nbytes = req->cryptlen;
151 unsigned int offset; 151 unsigned int offset;
152 152
153 skcipher_request_set_tfm(subreq, ctx-> 153 skcipher_request_set_tfm(subreq, ctx->child);
154 154
155 if (nbytes < bsize) 155 if (nbytes < bsize)
156 return -EINVAL; 156 return -EINVAL;
157 157
158 if (nbytes == bsize) { 158 if (nbytes == bsize) {
159 skcipher_request_set_callback( 159 skcipher_request_set_callback(subreq, req->base.flags,
160 160 req->base.complete,
161 161 req->base.data);
162 skcipher_request_set_crypt(sub 162 skcipher_request_set_crypt(subreq, req->src, req->dst, nbytes,
163 req 163 req->iv);
164 return crypto_skcipher_encrypt 164 return crypto_skcipher_encrypt(subreq);
165 } 165 }
166 166
167 offset = rounddown(nbytes - 1, bsize); 167 offset = rounddown(nbytes - 1, bsize);
168 rctx->offset = offset; 168 rctx->offset = offset;
169 169
170 skcipher_request_set_callback(subreq, 170 skcipher_request_set_callback(subreq, req->base.flags,
171 crypto_c 171 crypto_cts_encrypt_done, req);
172 skcipher_request_set_crypt(subreq, req 172 skcipher_request_set_crypt(subreq, req->src, req->dst,
173 offset, req 173 offset, req->iv);
174 174
175 return crypto_skcipher_encrypt(subreq) 175 return crypto_skcipher_encrypt(subreq) ?:
176 cts_cbc_encrypt(req); 176 cts_cbc_encrypt(req);
177 } 177 }
178 178
179 static int cts_cbc_decrypt(struct skcipher_req 179 static int cts_cbc_decrypt(struct skcipher_request *req)
180 { 180 {
181 struct crypto_cts_reqctx *rctx = skcip 181 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
182 struct crypto_skcipher *tfm = crypto_s 182 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
183 struct skcipher_request *subreq = &rct 183 struct skcipher_request *subreq = &rctx->subreq;
184 int bsize = crypto_skcipher_blocksize( 184 int bsize = crypto_skcipher_blocksize(tfm);
185 u8 d[MAX_CIPHER_BLOCKSIZE * 2] __align 185 u8 d[MAX_CIPHER_BLOCKSIZE * 2] __aligned(__alignof__(u32));
186 struct scatterlist *sg; 186 struct scatterlist *sg;
187 unsigned int offset; 187 unsigned int offset;
188 u8 *space; 188 u8 *space;
189 int lastn; 189 int lastn;
190 190
191 offset = rctx->offset; 191 offset = rctx->offset;
192 lastn = req->cryptlen - offset; 192 lastn = req->cryptlen - offset;
193 193
194 sg = scatterwalk_ffwd(rctx->sg, req->d 194 sg = scatterwalk_ffwd(rctx->sg, req->dst, offset - bsize);
195 195
196 /* 1. Decrypt Cn-1 (s) to create Dn */ 196 /* 1. Decrypt Cn-1 (s) to create Dn */
197 scatterwalk_map_and_copy(d + bsize, sg 197 scatterwalk_map_and_copy(d + bsize, sg, 0, bsize, 0);
198 space = crypto_cts_reqctx_space(req); 198 space = crypto_cts_reqctx_space(req);
199 crypto_xor(d + bsize, space, bsize); 199 crypto_xor(d + bsize, space, bsize);
200 /* 2. Pad Cn with zeros at the end to 200 /* 2. Pad Cn with zeros at the end to create C of length BB */
201 memset(d, 0, bsize); 201 memset(d, 0, bsize);
202 scatterwalk_map_and_copy(d, req->src, 202 scatterwalk_map_and_copy(d, req->src, offset, lastn, 0);
203 /* 3. Exclusive-or Dn with C to create 203 /* 3. Exclusive-or Dn with C to create Xn */
204 /* 4. Select the first Ln bytes of Xn 204 /* 4. Select the first Ln bytes of Xn to create Pn */
205 crypto_xor(d + bsize, d, lastn); 205 crypto_xor(d + bsize, d, lastn);
206 206
207 /* 5. Append the tail (BB - Ln) bytes 207 /* 5. Append the tail (BB - Ln) bytes of Xn to Cn to create En */
208 memcpy(d + lastn, d + bsize + lastn, b 208 memcpy(d + lastn, d + bsize + lastn, bsize - lastn);
209 /* 6. Decrypt En to create Pn-1 */ 209 /* 6. Decrypt En to create Pn-1 */
210 210
211 scatterwalk_map_and_copy(d, sg, 0, bsi 211 scatterwalk_map_and_copy(d, sg, 0, bsize + lastn, 1);
212 memzero_explicit(d, sizeof(d)); 212 memzero_explicit(d, sizeof(d));
213 213
214 skcipher_request_set_callback(subreq, 214 skcipher_request_set_callback(subreq, req->base.flags &
215 215 CRYPTO_TFM_REQ_MAY_BACKLOG,
216 cts_cbc_ 216 cts_cbc_crypt_done, req);
217 217
218 skcipher_request_set_crypt(subreq, sg, 218 skcipher_request_set_crypt(subreq, sg, sg, bsize, space);
219 return crypto_skcipher_decrypt(subreq) 219 return crypto_skcipher_decrypt(subreq);
220 } 220 }
221 221
222 static void crypto_cts_decrypt_done(void *data 222 static void crypto_cts_decrypt_done(void *data, int err)
223 { 223 {
224 struct skcipher_request *req = data; 224 struct skcipher_request *req = data;
225 225
226 if (err) 226 if (err)
227 goto out; 227 goto out;
228 228
229 err = cts_cbc_decrypt(req); 229 err = cts_cbc_decrypt(req);
230 if (err == -EINPROGRESS || err == -EBU 230 if (err == -EINPROGRESS || err == -EBUSY)
231 return; 231 return;
232 232
233 out: 233 out:
234 skcipher_request_complete(req, err); 234 skcipher_request_complete(req, err);
235 } 235 }
236 236
237 static int crypto_cts_decrypt(struct skcipher_ 237 static int crypto_cts_decrypt(struct skcipher_request *req)
238 { 238 {
239 struct crypto_skcipher *tfm = crypto_s 239 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
240 struct crypto_cts_reqctx *rctx = skcip 240 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
241 struct crypto_cts_ctx *ctx = crypto_sk 241 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
242 struct skcipher_request *subreq = &rct 242 struct skcipher_request *subreq = &rctx->subreq;
243 int bsize = crypto_skcipher_blocksize( 243 int bsize = crypto_skcipher_blocksize(tfm);
244 unsigned int nbytes = req->cryptlen; 244 unsigned int nbytes = req->cryptlen;
245 unsigned int offset; 245 unsigned int offset;
246 u8 *space; 246 u8 *space;
247 247
248 skcipher_request_set_tfm(subreq, ctx-> 248 skcipher_request_set_tfm(subreq, ctx->child);
249 249
250 if (nbytes < bsize) 250 if (nbytes < bsize)
251 return -EINVAL; 251 return -EINVAL;
252 252
253 if (nbytes == bsize) { 253 if (nbytes == bsize) {
254 skcipher_request_set_callback( 254 skcipher_request_set_callback(subreq, req->base.flags,
255 255 req->base.complete,
256 256 req->base.data);
257 skcipher_request_set_crypt(sub 257 skcipher_request_set_crypt(subreq, req->src, req->dst, nbytes,
258 req 258 req->iv);
259 return crypto_skcipher_decrypt 259 return crypto_skcipher_decrypt(subreq);
260 } 260 }
261 261
262 skcipher_request_set_callback(subreq, 262 skcipher_request_set_callback(subreq, req->base.flags,
263 crypto_c 263 crypto_cts_decrypt_done, req);
264 264
265 space = crypto_cts_reqctx_space(req); 265 space = crypto_cts_reqctx_space(req);
266 266
267 offset = rounddown(nbytes - 1, bsize); 267 offset = rounddown(nbytes - 1, bsize);
268 rctx->offset = offset; 268 rctx->offset = offset;
269 269
270 if (offset <= bsize) 270 if (offset <= bsize)
271 memcpy(space, req->iv, bsize); 271 memcpy(space, req->iv, bsize);
272 else 272 else
273 scatterwalk_map_and_copy(space 273 scatterwalk_map_and_copy(space, req->src, offset - 2 * bsize,
274 bsize 274 bsize, 0);
275 275
276 skcipher_request_set_crypt(subreq, req 276 skcipher_request_set_crypt(subreq, req->src, req->dst,
277 offset, req 277 offset, req->iv);
278 278
279 return crypto_skcipher_decrypt(subreq) 279 return crypto_skcipher_decrypt(subreq) ?:
280 cts_cbc_decrypt(req); 280 cts_cbc_decrypt(req);
281 } 281 }
282 282
283 static int crypto_cts_init_tfm(struct crypto_s 283 static int crypto_cts_init_tfm(struct crypto_skcipher *tfm)
284 { 284 {
285 struct skcipher_instance *inst = skcip 285 struct skcipher_instance *inst = skcipher_alg_instance(tfm);
286 struct crypto_skcipher_spawn *spawn = 286 struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
287 struct crypto_cts_ctx *ctx = crypto_sk 287 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
288 struct crypto_skcipher *cipher; 288 struct crypto_skcipher *cipher;
289 unsigned reqsize; 289 unsigned reqsize;
290 unsigned bsize; 290 unsigned bsize;
291 unsigned align; 291 unsigned align;
292 292
293 cipher = crypto_spawn_skcipher(spawn); 293 cipher = crypto_spawn_skcipher(spawn);
294 if (IS_ERR(cipher)) 294 if (IS_ERR(cipher))
295 return PTR_ERR(cipher); 295 return PTR_ERR(cipher);
296 296
297 ctx->child = cipher; 297 ctx->child = cipher;
298 298
299 align = crypto_skcipher_alignmask(tfm) 299 align = crypto_skcipher_alignmask(tfm);
300 bsize = crypto_skcipher_blocksize(ciph 300 bsize = crypto_skcipher_blocksize(cipher);
301 reqsize = ALIGN(sizeof(struct crypto_c 301 reqsize = ALIGN(sizeof(struct crypto_cts_reqctx) +
302 crypto_skcipher_reqsiz 302 crypto_skcipher_reqsize(cipher),
303 crypto_tfm_ctx_alignme 303 crypto_tfm_ctx_alignment()) +
304 (align & ~(crypto_tfm_ctx_al 304 (align & ~(crypto_tfm_ctx_alignment() - 1)) + bsize;
305 305
306 crypto_skcipher_set_reqsize(tfm, reqsi 306 crypto_skcipher_set_reqsize(tfm, reqsize);
307 307
308 return 0; 308 return 0;
309 } 309 }
310 310
311 static void crypto_cts_exit_tfm(struct crypto_ 311 static void crypto_cts_exit_tfm(struct crypto_skcipher *tfm)
312 { 312 {
313 struct crypto_cts_ctx *ctx = crypto_sk 313 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
314 314
315 crypto_free_skcipher(ctx->child); 315 crypto_free_skcipher(ctx->child);
316 } 316 }
317 317
318 static void crypto_cts_free(struct skcipher_in 318 static void crypto_cts_free(struct skcipher_instance *inst)
319 { 319 {
320 crypto_drop_skcipher(skcipher_instance 320 crypto_drop_skcipher(skcipher_instance_ctx(inst));
321 kfree(inst); 321 kfree(inst);
322 } 322 }
323 323
324 static int crypto_cts_create(struct crypto_tem 324 static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
325 { 325 {
326 struct crypto_skcipher_spawn *spawn; 326 struct crypto_skcipher_spawn *spawn;
327 struct skcipher_alg_common *alg; 327 struct skcipher_alg_common *alg;
328 struct skcipher_instance *inst; 328 struct skcipher_instance *inst;
329 u32 mask; 329 u32 mask;
330 int err; 330 int err;
331 331
332 err = crypto_check_attr_type(tb, CRYPT 332 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask);
333 if (err) 333 if (err)
334 return err; 334 return err;
335 335
336 inst = kzalloc(sizeof(*inst) + sizeof( 336 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
337 if (!inst) 337 if (!inst)
338 return -ENOMEM; 338 return -ENOMEM;
339 339
340 spawn = skcipher_instance_ctx(inst); 340 spawn = skcipher_instance_ctx(inst);
341 341
342 err = crypto_grab_skcipher(spawn, skci 342 err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
343 crypto_attr 343 crypto_attr_alg_name(tb[1]), 0, mask);
344 if (err) 344 if (err)
345 goto err_free_inst; 345 goto err_free_inst;
346 346
347 alg = crypto_spawn_skcipher_alg_common 347 alg = crypto_spawn_skcipher_alg_common(spawn);
348 348
349 err = -EINVAL; 349 err = -EINVAL;
350 if (alg->ivsize != alg->base.cra_block 350 if (alg->ivsize != alg->base.cra_blocksize)
351 goto err_free_inst; 351 goto err_free_inst;
352 352
353 if (strncmp(alg->base.cra_name, "cbc(" 353 if (strncmp(alg->base.cra_name, "cbc(", 4))
354 goto err_free_inst; 354 goto err_free_inst;
355 355
356 err = crypto_inst_setname(skcipher_cry 356 err = crypto_inst_setname(skcipher_crypto_instance(inst), "cts",
357 &alg->base); 357 &alg->base);
358 if (err) 358 if (err)
359 goto err_free_inst; 359 goto err_free_inst;
360 360
361 inst->alg.base.cra_priority = alg->bas 361 inst->alg.base.cra_priority = alg->base.cra_priority;
362 inst->alg.base.cra_blocksize = alg->ba 362 inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
363 inst->alg.base.cra_alignmask = alg->ba 363 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
364 364
365 inst->alg.ivsize = alg->base.cra_block 365 inst->alg.ivsize = alg->base.cra_blocksize;
366 inst->alg.chunksize = alg->chunksize; 366 inst->alg.chunksize = alg->chunksize;
367 inst->alg.min_keysize = alg->min_keysi 367 inst->alg.min_keysize = alg->min_keysize;
368 inst->alg.max_keysize = alg->max_keysi 368 inst->alg.max_keysize = alg->max_keysize;
369 369
370 inst->alg.base.cra_ctxsize = sizeof(st 370 inst->alg.base.cra_ctxsize = sizeof(struct crypto_cts_ctx);
371 371
372 inst->alg.init = crypto_cts_init_tfm; 372 inst->alg.init = crypto_cts_init_tfm;
373 inst->alg.exit = crypto_cts_exit_tfm; 373 inst->alg.exit = crypto_cts_exit_tfm;
374 374
375 inst->alg.setkey = crypto_cts_setkey; 375 inst->alg.setkey = crypto_cts_setkey;
376 inst->alg.encrypt = crypto_cts_encrypt 376 inst->alg.encrypt = crypto_cts_encrypt;
377 inst->alg.decrypt = crypto_cts_decrypt 377 inst->alg.decrypt = crypto_cts_decrypt;
378 378
379 inst->free = crypto_cts_free; 379 inst->free = crypto_cts_free;
380 380
381 err = skcipher_register_instance(tmpl, 381 err = skcipher_register_instance(tmpl, inst);
382 if (err) { 382 if (err) {
383 err_free_inst: 383 err_free_inst:
384 crypto_cts_free(inst); 384 crypto_cts_free(inst);
385 } 385 }
386 return err; 386 return err;
387 } 387 }
388 388
389 static struct crypto_template crypto_cts_tmpl 389 static struct crypto_template crypto_cts_tmpl = {
390 .name = "cts", 390 .name = "cts",
391 .create = crypto_cts_create, 391 .create = crypto_cts_create,
392 .module = THIS_MODULE, 392 .module = THIS_MODULE,
393 }; 393 };
394 394
395 static int __init crypto_cts_module_init(void) 395 static int __init crypto_cts_module_init(void)
396 { 396 {
397 return crypto_register_template(&crypt 397 return crypto_register_template(&crypto_cts_tmpl);
398 } 398 }
399 399
400 static void __exit crypto_cts_module_exit(void 400 static void __exit crypto_cts_module_exit(void)
401 { 401 {
402 crypto_unregister_template(&crypto_cts 402 crypto_unregister_template(&crypto_cts_tmpl);
403 } 403 }
404 404
405 subsys_initcall(crypto_cts_module_init); 405 subsys_initcall(crypto_cts_module_init);
406 module_exit(crypto_cts_module_exit); 406 module_exit(crypto_cts_module_exit);
407 407
408 MODULE_LICENSE("Dual BSD/GPL"); 408 MODULE_LICENSE("Dual BSD/GPL");
409 MODULE_DESCRIPTION("CTS-CBC CipherText Stealin 409 MODULE_DESCRIPTION("CTS-CBC CipherText Stealing for CBC");
410 MODULE_ALIAS_CRYPTO("cts"); 410 MODULE_ALIAS_CRYPTO("cts");
411 411
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