Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * Support for VIA PadLock hardware crypto engine. | |
5 | * | |
6 | * Copyright (c) 2004 Michal Ludvig <michal@logix.cz> | |
7 | * | |
8 | * Key expansion routine taken from crypto/aes.c | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * --------------------------------------------------------------------------- | |
16 | * Copyright (c) 2002, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK. | |
17 | * All rights reserved. | |
18 | * | |
19 | * LICENSE TERMS | |
20 | * | |
21 | * The free distribution and use of this software in both source and binary | |
22 | * form is allowed (with or without changes) provided that: | |
23 | * | |
24 | * 1. distributions of this source code include the above copyright | |
25 | * notice, this list of conditions and the following disclaimer; | |
26 | * | |
27 | * 2. distributions in binary form include the above copyright | |
28 | * notice, this list of conditions and the following disclaimer | |
29 | * in the documentation and/or other associated materials; | |
30 | * | |
31 | * 3. the copyright holder's name is not used to endorse products | |
32 | * built using this software without specific written permission. | |
33 | * | |
34 | * ALTERNATIVELY, provided that this notice is retained in full, this product | |
35 | * may be distributed under the terms of the GNU General Public License (GPL), | |
36 | * in which case the provisions of the GPL apply INSTEAD OF those given above. | |
37 | * | |
38 | * DISCLAIMER | |
39 | * | |
40 | * This software is provided 'as is' with no explicit or implied warranties | |
41 | * in respect of its properties, including, but not limited to, correctness | |
42 | * and/or fitness for purpose. | |
43 | * --------------------------------------------------------------------------- | |
44 | */ | |
45 | ||
46 | #include <linux/module.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/types.h> | |
49 | #include <linux/errno.h> | |
50 | #include <linux/crypto.h> | |
51 | #include <linux/interrupt.h> | |
6789b2dc | 52 | #include <linux/kernel.h> |
1da177e4 LT |
53 | #include <asm/byteorder.h> |
54 | #include "padlock.h" | |
55 | ||
56 | #define AES_MIN_KEY_SIZE 16 /* in uint8_t units */ | |
57 | #define AES_MAX_KEY_SIZE 32 /* ditto */ | |
58 | #define AES_BLOCK_SIZE 16 /* ditto */ | |
59 | #define AES_EXTENDED_KEY_SIZE 64 /* in uint32_t units */ | |
60 | #define AES_EXTENDED_KEY_SIZE_B (AES_EXTENDED_KEY_SIZE * sizeof(uint32_t)) | |
61 | ||
62 | struct aes_ctx { | |
6789b2dc HX |
63 | uint32_t e_data[AES_EXTENDED_KEY_SIZE]; |
64 | uint32_t d_data[AES_EXTENDED_KEY_SIZE]; | |
65 | struct { | |
66 | struct cword encrypt; | |
67 | struct cword decrypt; | |
68 | } cword; | |
1da177e4 LT |
69 | uint32_t *E; |
70 | uint32_t *D; | |
71 | int key_length; | |
72 | }; | |
73 | ||
74 | /* ====== Key management routines ====== */ | |
75 | ||
76 | static inline uint32_t | |
77 | generic_rotr32 (const uint32_t x, const unsigned bits) | |
78 | { | |
79 | const unsigned n = bits % 32; | |
80 | return (x >> n) | (x << (32 - n)); | |
81 | } | |
82 | ||
83 | static inline uint32_t | |
84 | generic_rotl32 (const uint32_t x, const unsigned bits) | |
85 | { | |
86 | const unsigned n = bits % 32; | |
87 | return (x << n) | (x >> (32 - n)); | |
88 | } | |
89 | ||
90 | #define rotl generic_rotl32 | |
91 | #define rotr generic_rotr32 | |
92 | ||
93 | /* | |
94 | * #define byte(x, nr) ((unsigned char)((x) >> (nr*8))) | |
95 | */ | |
96 | static inline uint8_t | |
97 | byte(const uint32_t x, const unsigned n) | |
98 | { | |
99 | return x >> (n << 3); | |
100 | } | |
101 | ||
1da177e4 LT |
102 | #define E_KEY ctx->E |
103 | #define D_KEY ctx->D | |
104 | ||
105 | static uint8_t pow_tab[256]; | |
106 | static uint8_t log_tab[256]; | |
107 | static uint8_t sbx_tab[256]; | |
108 | static uint8_t isb_tab[256]; | |
109 | static uint32_t rco_tab[10]; | |
110 | static uint32_t ft_tab[4][256]; | |
111 | static uint32_t it_tab[4][256]; | |
112 | ||
113 | static uint32_t fl_tab[4][256]; | |
114 | static uint32_t il_tab[4][256]; | |
115 | ||
116 | static inline uint8_t | |
117 | f_mult (uint8_t a, uint8_t b) | |
118 | { | |
119 | uint8_t aa = log_tab[a], cc = aa + log_tab[b]; | |
120 | ||
121 | return pow_tab[cc + (cc < aa ? 1 : 0)]; | |
122 | } | |
123 | ||
124 | #define ff_mult(a,b) (a && b ? f_mult(a, b) : 0) | |
125 | ||
126 | #define f_rn(bo, bi, n, k) \ | |
127 | bo[n] = ft_tab[0][byte(bi[n],0)] ^ \ | |
128 | ft_tab[1][byte(bi[(n + 1) & 3],1)] ^ \ | |
129 | ft_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ | |
130 | ft_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n) | |
131 | ||
132 | #define i_rn(bo, bi, n, k) \ | |
133 | bo[n] = it_tab[0][byte(bi[n],0)] ^ \ | |
134 | it_tab[1][byte(bi[(n + 3) & 3],1)] ^ \ | |
135 | it_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ | |
136 | it_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n) | |
137 | ||
138 | #define ls_box(x) \ | |
139 | ( fl_tab[0][byte(x, 0)] ^ \ | |
140 | fl_tab[1][byte(x, 1)] ^ \ | |
141 | fl_tab[2][byte(x, 2)] ^ \ | |
142 | fl_tab[3][byte(x, 3)] ) | |
143 | ||
144 | #define f_rl(bo, bi, n, k) \ | |
145 | bo[n] = fl_tab[0][byte(bi[n],0)] ^ \ | |
146 | fl_tab[1][byte(bi[(n + 1) & 3],1)] ^ \ | |
147 | fl_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ | |
148 | fl_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n) | |
149 | ||
150 | #define i_rl(bo, bi, n, k) \ | |
151 | bo[n] = il_tab[0][byte(bi[n],0)] ^ \ | |
152 | il_tab[1][byte(bi[(n + 3) & 3],1)] ^ \ | |
153 | il_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ | |
154 | il_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n) | |
155 | ||
156 | static void | |
157 | gen_tabs (void) | |
158 | { | |
159 | uint32_t i, t; | |
160 | uint8_t p, q; | |
161 | ||
162 | /* log and power tables for GF(2**8) finite field with | |
163 | 0x011b as modular polynomial - the simplest prmitive | |
164 | root is 0x03, used here to generate the tables */ | |
165 | ||
166 | for (i = 0, p = 1; i < 256; ++i) { | |
167 | pow_tab[i] = (uint8_t) p; | |
168 | log_tab[p] = (uint8_t) i; | |
169 | ||
170 | p ^= (p << 1) ^ (p & 0x80 ? 0x01b : 0); | |
171 | } | |
172 | ||
173 | log_tab[1] = 0; | |
174 | ||
175 | for (i = 0, p = 1; i < 10; ++i) { | |
176 | rco_tab[i] = p; | |
177 | ||
178 | p = (p << 1) ^ (p & 0x80 ? 0x01b : 0); | |
179 | } | |
180 | ||
181 | for (i = 0; i < 256; ++i) { | |
182 | p = (i ? pow_tab[255 - log_tab[i]] : 0); | |
183 | q = ((p >> 7) | (p << 1)) ^ ((p >> 6) | (p << 2)); | |
184 | p ^= 0x63 ^ q ^ ((q >> 6) | (q << 2)); | |
185 | sbx_tab[i] = p; | |
186 | isb_tab[p] = (uint8_t) i; | |
187 | } | |
188 | ||
189 | for (i = 0; i < 256; ++i) { | |
190 | p = sbx_tab[i]; | |
191 | ||
192 | t = p; | |
193 | fl_tab[0][i] = t; | |
194 | fl_tab[1][i] = rotl (t, 8); | |
195 | fl_tab[2][i] = rotl (t, 16); | |
196 | fl_tab[3][i] = rotl (t, 24); | |
197 | ||
198 | t = ((uint32_t) ff_mult (2, p)) | | |
199 | ((uint32_t) p << 8) | | |
200 | ((uint32_t) p << 16) | ((uint32_t) ff_mult (3, p) << 24); | |
201 | ||
202 | ft_tab[0][i] = t; | |
203 | ft_tab[1][i] = rotl (t, 8); | |
204 | ft_tab[2][i] = rotl (t, 16); | |
205 | ft_tab[3][i] = rotl (t, 24); | |
206 | ||
207 | p = isb_tab[i]; | |
208 | ||
209 | t = p; | |
210 | il_tab[0][i] = t; | |
211 | il_tab[1][i] = rotl (t, 8); | |
212 | il_tab[2][i] = rotl (t, 16); | |
213 | il_tab[3][i] = rotl (t, 24); | |
214 | ||
215 | t = ((uint32_t) ff_mult (14, p)) | | |
216 | ((uint32_t) ff_mult (9, p) << 8) | | |
217 | ((uint32_t) ff_mult (13, p) << 16) | | |
218 | ((uint32_t) ff_mult (11, p) << 24); | |
219 | ||
220 | it_tab[0][i] = t; | |
221 | it_tab[1][i] = rotl (t, 8); | |
222 | it_tab[2][i] = rotl (t, 16); | |
223 | it_tab[3][i] = rotl (t, 24); | |
224 | } | |
225 | } | |
226 | ||
227 | #define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b) | |
228 | ||
229 | #define imix_col(y,x) \ | |
230 | u = star_x(x); \ | |
231 | v = star_x(u); \ | |
232 | w = star_x(v); \ | |
233 | t = w ^ (x); \ | |
234 | (y) = u ^ v ^ w; \ | |
235 | (y) ^= rotr(u ^ t, 8) ^ \ | |
236 | rotr(v ^ t, 16) ^ \ | |
237 | rotr(t,24) | |
238 | ||
239 | /* initialise the key schedule from the user supplied key */ | |
240 | ||
241 | #define loop4(i) \ | |
242 | { t = rotr(t, 8); t = ls_box(t) ^ rco_tab[i]; \ | |
243 | t ^= E_KEY[4 * i]; E_KEY[4 * i + 4] = t; \ | |
244 | t ^= E_KEY[4 * i + 1]; E_KEY[4 * i + 5] = t; \ | |
245 | t ^= E_KEY[4 * i + 2]; E_KEY[4 * i + 6] = t; \ | |
246 | t ^= E_KEY[4 * i + 3]; E_KEY[4 * i + 7] = t; \ | |
247 | } | |
248 | ||
249 | #define loop6(i) \ | |
250 | { t = rotr(t, 8); t = ls_box(t) ^ rco_tab[i]; \ | |
251 | t ^= E_KEY[6 * i]; E_KEY[6 * i + 6] = t; \ | |
252 | t ^= E_KEY[6 * i + 1]; E_KEY[6 * i + 7] = t; \ | |
253 | t ^= E_KEY[6 * i + 2]; E_KEY[6 * i + 8] = t; \ | |
254 | t ^= E_KEY[6 * i + 3]; E_KEY[6 * i + 9] = t; \ | |
255 | t ^= E_KEY[6 * i + 4]; E_KEY[6 * i + 10] = t; \ | |
256 | t ^= E_KEY[6 * i + 5]; E_KEY[6 * i + 11] = t; \ | |
257 | } | |
258 | ||
259 | #define loop8(i) \ | |
260 | { t = rotr(t, 8); ; t = ls_box(t) ^ rco_tab[i]; \ | |
261 | t ^= E_KEY[8 * i]; E_KEY[8 * i + 8] = t; \ | |
262 | t ^= E_KEY[8 * i + 1]; E_KEY[8 * i + 9] = t; \ | |
263 | t ^= E_KEY[8 * i + 2]; E_KEY[8 * i + 10] = t; \ | |
264 | t ^= E_KEY[8 * i + 3]; E_KEY[8 * i + 11] = t; \ | |
265 | t = E_KEY[8 * i + 4] ^ ls_box(t); \ | |
266 | E_KEY[8 * i + 12] = t; \ | |
267 | t ^= E_KEY[8 * i + 5]; E_KEY[8 * i + 13] = t; \ | |
268 | t ^= E_KEY[8 * i + 6]; E_KEY[8 * i + 14] = t; \ | |
269 | t ^= E_KEY[8 * i + 7]; E_KEY[8 * i + 15] = t; \ | |
270 | } | |
271 | ||
272 | /* Tells whether the ACE is capable to generate | |
273 | the extended key for a given key_len. */ | |
274 | static inline int | |
275 | aes_hw_extkey_available(uint8_t key_len) | |
276 | { | |
277 | /* TODO: We should check the actual CPU model/stepping | |
278 | as it's possible that the capability will be | |
279 | added in the next CPU revisions. */ | |
280 | if (key_len == 16) | |
281 | return 1; | |
282 | return 0; | |
283 | } | |
284 | ||
6c2bb98b | 285 | static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm) |
6789b2dc | 286 | { |
6c2bb98b | 287 | unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm); |
f10b7897 HX |
288 | unsigned long align = PADLOCK_ALIGNMENT; |
289 | ||
290 | if (align <= crypto_tfm_ctx_alignment()) | |
291 | align = 1; | |
6c2bb98b | 292 | return (struct aes_ctx *)ALIGN(addr, align); |
6789b2dc HX |
293 | } |
294 | ||
6c2bb98b HX |
295 | static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, |
296 | unsigned int key_len, u32 *flags) | |
1da177e4 | 297 | { |
6c2bb98b | 298 | struct aes_ctx *ctx = aes_ctx(tfm); |
06ace7a9 | 299 | const __le32 *key = (const __le32 *)in_key; |
1da177e4 LT |
300 | uint32_t i, t, u, v, w; |
301 | uint32_t P[AES_EXTENDED_KEY_SIZE]; | |
302 | uint32_t rounds; | |
303 | ||
304 | if (key_len != 16 && key_len != 24 && key_len != 32) { | |
305 | *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
306 | return -EINVAL; | |
307 | } | |
308 | ||
309 | ctx->key_length = key_len; | |
310 | ||
6789b2dc HX |
311 | /* |
312 | * If the hardware is capable of generating the extended key | |
313 | * itself we must supply the plain key for both encryption | |
314 | * and decryption. | |
315 | */ | |
1da177e4 | 316 | ctx->E = ctx->e_data; |
6789b2dc | 317 | ctx->D = ctx->e_data; |
1da177e4 | 318 | |
06ace7a9 HX |
319 | E_KEY[0] = le32_to_cpu(key[0]); |
320 | E_KEY[1] = le32_to_cpu(key[1]); | |
321 | E_KEY[2] = le32_to_cpu(key[2]); | |
322 | E_KEY[3] = le32_to_cpu(key[3]); | |
1da177e4 | 323 | |
6789b2dc HX |
324 | /* Prepare control words. */ |
325 | memset(&ctx->cword, 0, sizeof(ctx->cword)); | |
326 | ||
327 | ctx->cword.decrypt.encdec = 1; | |
328 | ctx->cword.encrypt.rounds = 10 + (key_len - 16) / 4; | |
329 | ctx->cword.decrypt.rounds = ctx->cword.encrypt.rounds; | |
330 | ctx->cword.encrypt.ksize = (key_len - 16) / 8; | |
331 | ctx->cword.decrypt.ksize = ctx->cword.encrypt.ksize; | |
332 | ||
1da177e4 LT |
333 | /* Don't generate extended keys if the hardware can do it. */ |
334 | if (aes_hw_extkey_available(key_len)) | |
335 | return 0; | |
336 | ||
6789b2dc HX |
337 | ctx->D = ctx->d_data; |
338 | ctx->cword.encrypt.keygen = 1; | |
339 | ctx->cword.decrypt.keygen = 1; | |
340 | ||
1da177e4 LT |
341 | switch (key_len) { |
342 | case 16: | |
343 | t = E_KEY[3]; | |
344 | for (i = 0; i < 10; ++i) | |
345 | loop4 (i); | |
346 | break; | |
347 | ||
348 | case 24: | |
06ace7a9 HX |
349 | E_KEY[4] = le32_to_cpu(key[4]); |
350 | t = E_KEY[5] = le32_to_cpu(key[5]); | |
1da177e4 LT |
351 | for (i = 0; i < 8; ++i) |
352 | loop6 (i); | |
353 | break; | |
354 | ||
355 | case 32: | |
102d60a2 HX |
356 | E_KEY[4] = le32_to_cpu(key[4]); |
357 | E_KEY[5] = le32_to_cpu(key[5]); | |
358 | E_KEY[6] = le32_to_cpu(key[6]); | |
359 | t = E_KEY[7] = le32_to_cpu(key[7]); | |
1da177e4 LT |
360 | for (i = 0; i < 7; ++i) |
361 | loop8 (i); | |
362 | break; | |
363 | } | |
364 | ||
365 | D_KEY[0] = E_KEY[0]; | |
366 | D_KEY[1] = E_KEY[1]; | |
367 | D_KEY[2] = E_KEY[2]; | |
368 | D_KEY[3] = E_KEY[3]; | |
369 | ||
370 | for (i = 4; i < key_len + 24; ++i) { | |
371 | imix_col (D_KEY[i], E_KEY[i]); | |
372 | } | |
373 | ||
374 | /* PadLock needs a different format of the decryption key. */ | |
375 | rounds = 10 + (key_len - 16) / 4; | |
376 | ||
377 | for (i = 0; i < rounds; i++) { | |
378 | P[((i + 1) * 4) + 0] = D_KEY[((rounds - i - 1) * 4) + 0]; | |
379 | P[((i + 1) * 4) + 1] = D_KEY[((rounds - i - 1) * 4) + 1]; | |
380 | P[((i + 1) * 4) + 2] = D_KEY[((rounds - i - 1) * 4) + 2]; | |
381 | P[((i + 1) * 4) + 3] = D_KEY[((rounds - i - 1) * 4) + 3]; | |
382 | } | |
383 | ||
384 | P[0] = E_KEY[(rounds * 4) + 0]; | |
385 | P[1] = E_KEY[(rounds * 4) + 1]; | |
386 | P[2] = E_KEY[(rounds * 4) + 2]; | |
387 | P[3] = E_KEY[(rounds * 4) + 3]; | |
388 | ||
389 | memcpy(D_KEY, P, AES_EXTENDED_KEY_SIZE_B); | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | /* ====== Encryption/decryption routines ====== */ | |
395 | ||
28e8c3ad | 396 | /* These are the real call to PadLock. */ |
6789b2dc HX |
397 | static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key, |
398 | void *control_word, u32 count) | |
1da177e4 LT |
399 | { |
400 | asm volatile ("pushfl; popfl"); /* enforce key reload. */ | |
401 | asm volatile (".byte 0xf3,0x0f,0xa7,0xc8" /* rep xcryptecb */ | |
402 | : "+S"(input), "+D"(output) | |
403 | : "d"(control_word), "b"(key), "c"(count)); | |
404 | } | |
405 | ||
476df259 HX |
406 | static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key, |
407 | u8 *iv, void *control_word, u32 count) | |
28e8c3ad HX |
408 | { |
409 | /* Enforce key reload. */ | |
410 | asm volatile ("pushfl; popfl"); | |
411 | /* rep xcryptcbc */ | |
412 | asm volatile (".byte 0xf3,0x0f,0xa7,0xd0" | |
413 | : "+S" (input), "+D" (output), "+a" (iv) | |
414 | : "d" (control_word), "b" (key), "c" (count)); | |
476df259 | 415 | return iv; |
28e8c3ad HX |
416 | } |
417 | ||
6c2bb98b | 418 | static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
1da177e4 | 419 | { |
6c2bb98b | 420 | struct aes_ctx *ctx = aes_ctx(tfm); |
6789b2dc | 421 | padlock_xcrypt_ecb(in, out, ctx->E, &ctx->cword.encrypt, 1); |
1da177e4 LT |
422 | } |
423 | ||
6c2bb98b | 424 | static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
1da177e4 | 425 | { |
6c2bb98b | 426 | struct aes_ctx *ctx = aes_ctx(tfm); |
6789b2dc | 427 | padlock_xcrypt_ecb(in, out, ctx->D, &ctx->cword.decrypt, 1); |
1da177e4 LT |
428 | } |
429 | ||
28e8c3ad HX |
430 | static unsigned int aes_encrypt_ecb(const struct cipher_desc *desc, u8 *out, |
431 | const u8 *in, unsigned int nbytes) | |
432 | { | |
6c2bb98b | 433 | struct aes_ctx *ctx = aes_ctx(desc->tfm); |
28e8c3ad HX |
434 | padlock_xcrypt_ecb(in, out, ctx->E, &ctx->cword.encrypt, |
435 | nbytes / AES_BLOCK_SIZE); | |
436 | return nbytes & ~(AES_BLOCK_SIZE - 1); | |
437 | } | |
438 | ||
439 | static unsigned int aes_decrypt_ecb(const struct cipher_desc *desc, u8 *out, | |
440 | const u8 *in, unsigned int nbytes) | |
441 | { | |
6c2bb98b | 442 | struct aes_ctx *ctx = aes_ctx(desc->tfm); |
28e8c3ad HX |
443 | padlock_xcrypt_ecb(in, out, ctx->D, &ctx->cword.decrypt, |
444 | nbytes / AES_BLOCK_SIZE); | |
445 | return nbytes & ~(AES_BLOCK_SIZE - 1); | |
446 | } | |
447 | ||
448 | static unsigned int aes_encrypt_cbc(const struct cipher_desc *desc, u8 *out, | |
449 | const u8 *in, unsigned int nbytes) | |
450 | { | |
6c2bb98b | 451 | struct aes_ctx *ctx = aes_ctx(desc->tfm); |
476df259 HX |
452 | u8 *iv; |
453 | ||
454 | iv = padlock_xcrypt_cbc(in, out, ctx->E, desc->info, | |
455 | &ctx->cword.encrypt, nbytes / AES_BLOCK_SIZE); | |
456 | memcpy(desc->info, iv, AES_BLOCK_SIZE); | |
457 | ||
28e8c3ad HX |
458 | return nbytes & ~(AES_BLOCK_SIZE - 1); |
459 | } | |
460 | ||
461 | static unsigned int aes_decrypt_cbc(const struct cipher_desc *desc, u8 *out, | |
462 | const u8 *in, unsigned int nbytes) | |
463 | { | |
6c2bb98b | 464 | struct aes_ctx *ctx = aes_ctx(desc->tfm); |
28e8c3ad HX |
465 | padlock_xcrypt_cbc(in, out, ctx->D, desc->info, &ctx->cword.decrypt, |
466 | nbytes / AES_BLOCK_SIZE); | |
467 | return nbytes & ~(AES_BLOCK_SIZE - 1); | |
468 | } | |
469 | ||
1da177e4 LT |
470 | static struct crypto_alg aes_alg = { |
471 | .cra_name = "aes", | |
c8a19c91 HX |
472 | .cra_driver_name = "aes-padlock", |
473 | .cra_priority = 300, | |
1da177e4 LT |
474 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
475 | .cra_blocksize = AES_BLOCK_SIZE, | |
fbdae9f3 | 476 | .cra_ctxsize = sizeof(struct aes_ctx), |
6789b2dc | 477 | .cra_alignmask = PADLOCK_ALIGNMENT - 1, |
1da177e4 LT |
478 | .cra_module = THIS_MODULE, |
479 | .cra_list = LIST_HEAD_INIT(aes_alg.cra_list), | |
480 | .cra_u = { | |
481 | .cipher = { | |
482 | .cia_min_keysize = AES_MIN_KEY_SIZE, | |
483 | .cia_max_keysize = AES_MAX_KEY_SIZE, | |
484 | .cia_setkey = aes_set_key, | |
485 | .cia_encrypt = aes_encrypt, | |
28e8c3ad HX |
486 | .cia_decrypt = aes_decrypt, |
487 | .cia_encrypt_ecb = aes_encrypt_ecb, | |
488 | .cia_decrypt_ecb = aes_decrypt_ecb, | |
489 | .cia_encrypt_cbc = aes_encrypt_cbc, | |
490 | .cia_decrypt_cbc = aes_decrypt_cbc, | |
1da177e4 LT |
491 | } |
492 | } | |
493 | }; | |
494 | ||
495 | int __init padlock_init_aes(void) | |
496 | { | |
497 | printk(KERN_NOTICE PFX "Using VIA PadLock ACE for AES algorithm.\n"); | |
498 | ||
499 | gen_tabs(); | |
500 | return crypto_register_alg(&aes_alg); | |
501 | } | |
502 | ||
503 | void __exit padlock_fini_aes(void) | |
504 | { | |
505 | crypto_unregister_alg(&aes_alg); | |
506 | } |