Commit | Line | Data |
---|---|---|
596d8750 JK |
1 | /* |
2 | * Shared glue code for 128bit block ciphers | |
3 | * | |
a05248ed | 4 | * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi> |
596d8750 JK |
5 | * |
6 | * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: | |
7 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | * CTR part based on code (crypto/ctr.c) by: | |
9 | * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
24 | * USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <crypto/b128ops.h> | |
30 | #include <crypto/lrw.h> | |
31 | #include <crypto/xts.h> | |
32 | #include <asm/crypto/glue_helper.h> | |
33 | #include <crypto/scatterwalk.h> | |
34 | ||
35 | static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx, | |
36 | struct blkcipher_desc *desc, | |
37 | struct blkcipher_walk *walk) | |
38 | { | |
39 | void *ctx = crypto_blkcipher_ctx(desc->tfm); | |
40 | const unsigned int bsize = 128 / 8; | |
41 | unsigned int nbytes, i, func_bytes; | |
42 | bool fpu_enabled = false; | |
43 | int err; | |
44 | ||
45 | err = blkcipher_walk_virt(desc, walk); | |
46 | ||
47 | while ((nbytes = walk->nbytes)) { | |
48 | u8 *wsrc = walk->src.virt.addr; | |
49 | u8 *wdst = walk->dst.virt.addr; | |
50 | ||
51 | fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, | |
52 | desc, fpu_enabled, nbytes); | |
53 | ||
54 | for (i = 0; i < gctx->num_funcs; i++) { | |
55 | func_bytes = bsize * gctx->funcs[i].num_blocks; | |
56 | ||
57 | /* Process multi-block batch */ | |
58 | if (nbytes >= func_bytes) { | |
59 | do { | |
60 | gctx->funcs[i].fn_u.ecb(ctx, wdst, | |
61 | wsrc); | |
62 | ||
63 | wsrc += func_bytes; | |
64 | wdst += func_bytes; | |
65 | nbytes -= func_bytes; | |
66 | } while (nbytes >= func_bytes); | |
67 | ||
68 | if (nbytes < bsize) | |
69 | goto done; | |
70 | } | |
71 | } | |
72 | ||
73 | done: | |
74 | err = blkcipher_walk_done(desc, walk, nbytes); | |
75 | } | |
76 | ||
77 | glue_fpu_end(fpu_enabled); | |
78 | return err; | |
79 | } | |
80 | ||
81 | int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx, | |
82 | struct blkcipher_desc *desc, struct scatterlist *dst, | |
83 | struct scatterlist *src, unsigned int nbytes) | |
84 | { | |
85 | struct blkcipher_walk walk; | |
86 | ||
87 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
88 | return __glue_ecb_crypt_128bit(gctx, desc, &walk); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(glue_ecb_crypt_128bit); | |
91 | ||
92 | static unsigned int __glue_cbc_encrypt_128bit(const common_glue_func_t fn, | |
93 | struct blkcipher_desc *desc, | |
94 | struct blkcipher_walk *walk) | |
95 | { | |
96 | void *ctx = crypto_blkcipher_ctx(desc->tfm); | |
97 | const unsigned int bsize = 128 / 8; | |
98 | unsigned int nbytes = walk->nbytes; | |
99 | u128 *src = (u128 *)walk->src.virt.addr; | |
100 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
101 | u128 *iv = (u128 *)walk->iv; | |
102 | ||
103 | do { | |
104 | u128_xor(dst, src, iv); | |
105 | fn(ctx, (u8 *)dst, (u8 *)dst); | |
106 | iv = dst; | |
107 | ||
108 | src += 1; | |
109 | dst += 1; | |
110 | nbytes -= bsize; | |
111 | } while (nbytes >= bsize); | |
112 | ||
c9f97a27 | 113 | *(u128 *)walk->iv = *iv; |
596d8750 JK |
114 | return nbytes; |
115 | } | |
116 | ||
117 | int glue_cbc_encrypt_128bit(const common_glue_func_t fn, | |
118 | struct blkcipher_desc *desc, | |
119 | struct scatterlist *dst, | |
120 | struct scatterlist *src, unsigned int nbytes) | |
121 | { | |
122 | struct blkcipher_walk walk; | |
123 | int err; | |
124 | ||
125 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
126 | err = blkcipher_walk_virt(desc, &walk); | |
127 | ||
128 | while ((nbytes = walk.nbytes)) { | |
129 | nbytes = __glue_cbc_encrypt_128bit(fn, desc, &walk); | |
130 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
131 | } | |
132 | ||
133 | return err; | |
134 | } | |
135 | EXPORT_SYMBOL_GPL(glue_cbc_encrypt_128bit); | |
136 | ||
137 | static unsigned int | |
138 | __glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx, | |
139 | struct blkcipher_desc *desc, | |
140 | struct blkcipher_walk *walk) | |
141 | { | |
142 | void *ctx = crypto_blkcipher_ctx(desc->tfm); | |
143 | const unsigned int bsize = 128 / 8; | |
144 | unsigned int nbytes = walk->nbytes; | |
145 | u128 *src = (u128 *)walk->src.virt.addr; | |
146 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
147 | u128 last_iv; | |
148 | unsigned int num_blocks, func_bytes; | |
149 | unsigned int i; | |
150 | ||
151 | /* Start of the last block. */ | |
152 | src += nbytes / bsize - 1; | |
153 | dst += nbytes / bsize - 1; | |
154 | ||
155 | last_iv = *src; | |
156 | ||
157 | for (i = 0; i < gctx->num_funcs; i++) { | |
158 | num_blocks = gctx->funcs[i].num_blocks; | |
159 | func_bytes = bsize * num_blocks; | |
160 | ||
161 | /* Process multi-block batch */ | |
162 | if (nbytes >= func_bytes) { | |
163 | do { | |
164 | nbytes -= func_bytes - bsize; | |
165 | src -= num_blocks - 1; | |
166 | dst -= num_blocks - 1; | |
167 | ||
168 | gctx->funcs[i].fn_u.cbc(ctx, dst, src); | |
169 | ||
170 | nbytes -= bsize; | |
171 | if (nbytes < bsize) | |
172 | goto done; | |
173 | ||
174 | u128_xor(dst, dst, src - 1); | |
175 | src -= 1; | |
176 | dst -= 1; | |
177 | } while (nbytes >= func_bytes); | |
178 | ||
179 | if (nbytes < bsize) | |
180 | goto done; | |
181 | } | |
182 | } | |
183 | ||
184 | done: | |
185 | u128_xor(dst, dst, (u128 *)walk->iv); | |
186 | *(u128 *)walk->iv = last_iv; | |
187 | ||
188 | return nbytes; | |
189 | } | |
190 | ||
191 | int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx, | |
192 | struct blkcipher_desc *desc, | |
193 | struct scatterlist *dst, | |
194 | struct scatterlist *src, unsigned int nbytes) | |
195 | { | |
196 | const unsigned int bsize = 128 / 8; | |
197 | bool fpu_enabled = false; | |
198 | struct blkcipher_walk walk; | |
199 | int err; | |
200 | ||
201 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
202 | err = blkcipher_walk_virt(desc, &walk); | |
203 | ||
204 | while ((nbytes = walk.nbytes)) { | |
205 | fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, | |
206 | desc, fpu_enabled, nbytes); | |
207 | nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk); | |
208 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
209 | } | |
210 | ||
211 | glue_fpu_end(fpu_enabled); | |
212 | return err; | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit); | |
215 | ||
216 | static void glue_ctr_crypt_final_128bit(const common_glue_ctr_func_t fn_ctr, | |
217 | struct blkcipher_desc *desc, | |
218 | struct blkcipher_walk *walk) | |
219 | { | |
220 | void *ctx = crypto_blkcipher_ctx(desc->tfm); | |
221 | u8 *src = (u8 *)walk->src.virt.addr; | |
222 | u8 *dst = (u8 *)walk->dst.virt.addr; | |
223 | unsigned int nbytes = walk->nbytes; | |
58990986 | 224 | le128 ctrblk; |
596d8750 JK |
225 | u128 tmp; |
226 | ||
58990986 | 227 | be128_to_le128(&ctrblk, (be128 *)walk->iv); |
596d8750 JK |
228 | |
229 | memcpy(&tmp, src, nbytes); | |
230 | fn_ctr(ctx, &tmp, &tmp, &ctrblk); | |
231 | memcpy(dst, &tmp, nbytes); | |
232 | ||
58990986 | 233 | le128_to_be128((be128 *)walk->iv, &ctrblk); |
596d8750 | 234 | } |
596d8750 JK |
235 | |
236 | static unsigned int __glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx, | |
237 | struct blkcipher_desc *desc, | |
238 | struct blkcipher_walk *walk) | |
239 | { | |
240 | const unsigned int bsize = 128 / 8; | |
241 | void *ctx = crypto_blkcipher_ctx(desc->tfm); | |
242 | unsigned int nbytes = walk->nbytes; | |
243 | u128 *src = (u128 *)walk->src.virt.addr; | |
244 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
58990986 | 245 | le128 ctrblk; |
596d8750 JK |
246 | unsigned int num_blocks, func_bytes; |
247 | unsigned int i; | |
248 | ||
58990986 | 249 | be128_to_le128(&ctrblk, (be128 *)walk->iv); |
596d8750 JK |
250 | |
251 | /* Process multi-block batch */ | |
252 | for (i = 0; i < gctx->num_funcs; i++) { | |
253 | num_blocks = gctx->funcs[i].num_blocks; | |
254 | func_bytes = bsize * num_blocks; | |
255 | ||
256 | if (nbytes >= func_bytes) { | |
257 | do { | |
258 | gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk); | |
259 | ||
260 | src += num_blocks; | |
261 | dst += num_blocks; | |
262 | nbytes -= func_bytes; | |
263 | } while (nbytes >= func_bytes); | |
264 | ||
265 | if (nbytes < bsize) | |
266 | goto done; | |
267 | } | |
268 | } | |
269 | ||
270 | done: | |
58990986 | 271 | le128_to_be128((be128 *)walk->iv, &ctrblk); |
596d8750 JK |
272 | return nbytes; |
273 | } | |
274 | ||
275 | int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx, | |
276 | struct blkcipher_desc *desc, struct scatterlist *dst, | |
277 | struct scatterlist *src, unsigned int nbytes) | |
278 | { | |
279 | const unsigned int bsize = 128 / 8; | |
280 | bool fpu_enabled = false; | |
281 | struct blkcipher_walk walk; | |
282 | int err; | |
283 | ||
284 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
285 | err = blkcipher_walk_virt_block(desc, &walk, bsize); | |
286 | ||
287 | while ((nbytes = walk.nbytes) >= bsize) { | |
288 | fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, | |
289 | desc, fpu_enabled, nbytes); | |
290 | nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk); | |
291 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
292 | } | |
293 | ||
294 | glue_fpu_end(fpu_enabled); | |
295 | ||
296 | if (walk.nbytes) { | |
297 | glue_ctr_crypt_final_128bit( | |
298 | gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk); | |
299 | err = blkcipher_walk_done(desc, &walk, 0); | |
300 | } | |
301 | ||
302 | return err; | |
303 | } | |
304 | EXPORT_SYMBOL_GPL(glue_ctr_crypt_128bit); | |
305 | ||
a05248ed JK |
306 | static unsigned int __glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, |
307 | void *ctx, | |
308 | struct blkcipher_desc *desc, | |
309 | struct blkcipher_walk *walk) | |
310 | { | |
311 | const unsigned int bsize = 128 / 8; | |
312 | unsigned int nbytes = walk->nbytes; | |
313 | u128 *src = (u128 *)walk->src.virt.addr; | |
314 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
315 | unsigned int num_blocks, func_bytes; | |
316 | unsigned int i; | |
317 | ||
318 | /* Process multi-block batch */ | |
319 | for (i = 0; i < gctx->num_funcs; i++) { | |
320 | num_blocks = gctx->funcs[i].num_blocks; | |
321 | func_bytes = bsize * num_blocks; | |
322 | ||
323 | if (nbytes >= func_bytes) { | |
324 | do { | |
325 | gctx->funcs[i].fn_u.xts(ctx, dst, src, | |
326 | (le128 *)walk->iv); | |
327 | ||
328 | src += num_blocks; | |
329 | dst += num_blocks; | |
330 | nbytes -= func_bytes; | |
331 | } while (nbytes >= func_bytes); | |
332 | ||
333 | if (nbytes < bsize) | |
334 | goto done; | |
335 | } | |
336 | } | |
337 | ||
338 | done: | |
339 | return nbytes; | |
340 | } | |
341 | ||
342 | /* for implementations implementing faster XTS IV generator */ | |
343 | int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx, | |
344 | struct blkcipher_desc *desc, struct scatterlist *dst, | |
345 | struct scatterlist *src, unsigned int nbytes, | |
346 | void (*tweak_fn)(void *ctx, u8 *dst, const u8 *src), | |
347 | void *tweak_ctx, void *crypt_ctx) | |
348 | { | |
349 | const unsigned int bsize = 128 / 8; | |
350 | bool fpu_enabled = false; | |
351 | struct blkcipher_walk walk; | |
352 | int err; | |
353 | ||
354 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
355 | ||
356 | err = blkcipher_walk_virt(desc, &walk); | |
357 | nbytes = walk.nbytes; | |
358 | if (!nbytes) | |
359 | return err; | |
360 | ||
361 | /* set minimum length to bsize, for tweak_fn */ | |
362 | fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, | |
363 | desc, fpu_enabled, | |
364 | nbytes < bsize ? bsize : nbytes); | |
365 | ||
366 | /* calculate first value of T */ | |
367 | tweak_fn(tweak_ctx, walk.iv, walk.iv); | |
368 | ||
369 | while (nbytes) { | |
370 | nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk); | |
371 | ||
372 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
373 | nbytes = walk.nbytes; | |
374 | } | |
375 | ||
376 | glue_fpu_end(fpu_enabled); | |
377 | ||
378 | return err; | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit); | |
381 | ||
382 | void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src, le128 *iv, | |
383 | common_glue_func_t fn) | |
384 | { | |
385 | le128 ivblk = *iv; | |
386 | ||
387 | /* generate next IV */ | |
388 | le128_gf128mul_x_ble(iv, &ivblk); | |
389 | ||
390 | /* CC <- T xor C */ | |
391 | u128_xor(dst, src, (u128 *)&ivblk); | |
392 | ||
393 | /* PP <- D(Key2,CC) */ | |
394 | fn(ctx, (u8 *)dst, (u8 *)dst); | |
395 | ||
396 | /* P <- T xor PP */ | |
397 | u128_xor(dst, dst, (u128 *)&ivblk); | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit_one); | |
400 | ||
596d8750 | 401 | MODULE_LICENSE("GPL"); |