blob: cf30af74480f4519b50e3b1fcf0e9f7ebb21ac34 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Cryptographic API.
3 *
4 * AES Cipher Algorithm.
5 *
6 * Based on Brian Gladman's code.
7 *
8 * Linux developers:
9 * Alexander Kjeldaas <astor@fast.no>
10 * Herbert Valerio Riedel <hvr@hvrlab.org>
11 * Kyle McMartin <kyle@debian.org>
12 * Adam J. Richter <adam@yggdrasil.com> (conversion to 2.5 API).
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * ---------------------------------------------------------------------------
20 * Copyright (c) 2002, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
21 * All rights reserved.
22 *
23 * LICENSE TERMS
24 *
25 * The free distribution and use of this software in both source and binary
26 * form is allowed (with or without changes) provided that:
27 *
28 * 1. distributions of this source code include the above copyright
29 * notice, this list of conditions and the following disclaimer;
30 *
31 * 2. distributions in binary form include the above copyright
32 * notice, this list of conditions and the following disclaimer
33 * in the documentation and/or other associated materials;
34 *
35 * 3. the copyright holder's name is not used to endorse products
36 * built using this software without specific written permission.
37 *
38 * ALTERNATIVELY, provided that this notice is retained in full, this product
39 * may be distributed under the terms of the GNU General Public License (GPL),
40 * in which case the provisions of the GPL apply INSTEAD OF those given above.
41 *
42 * DISCLAIMER
43 *
44 * This software is provided 'as is' with no explicit or implied warranties
45 * in respect of its properties, including, but not limited to, correctness
46 * and/or fitness for purpose.
47 * ---------------------------------------------------------------------------
48 */
49
Sebastian Siewior89e12652007-10-17 23:18:57 +080050#include <crypto/aes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/module.h>
52#include <linux/init.h>
53#include <linux/types.h>
54#include <linux/errno.h>
55#include <linux/crypto.h>
56#include <asm/byteorder.h>
57
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +080058static inline u8 byte(const u32 x, const unsigned n)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
60 return x >> (n << 3);
61}
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static u8 pow_tab[256] __initdata;
64static u8 log_tab[256] __initdata;
65static u8 sbx_tab[256] __initdata;
66static u8 isb_tab[256] __initdata;
67static u32 rco_tab[10];
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Sebastian Siewior96e82e42007-11-08 21:20:30 +080069u32 crypto_ft_tab[4][256];
70u32 crypto_fl_tab[4][256];
71u32 crypto_it_tab[4][256];
72u32 crypto_il_tab[4][256];
73
74EXPORT_SYMBOL_GPL(crypto_ft_tab);
75EXPORT_SYMBOL_GPL(crypto_fl_tab);
76EXPORT_SYMBOL_GPL(crypto_it_tab);
77EXPORT_SYMBOL_GPL(crypto_il_tab);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +080079static inline u8 __init f_mult(u8 a, u8 b)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
81 u8 aa = log_tab[a], cc = aa + log_tab[b];
82
83 return pow_tab[cc + (cc < aa ? 1 : 0)];
84}
85
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +080086#define ff_mult(a, b) (a && b ? f_mult(a, b) : 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +080088static void __init gen_tabs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
90 u32 i, t;
91 u8 p, q;
92
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +080093 /*
94 * log and power tables for GF(2**8) finite field with
95 * 0x011b as modular polynomial - the simplest primitive
96 * root is 0x03, used here to generate the tables
97 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 for (i = 0, p = 1; i < 256; ++i) {
100 pow_tab[i] = (u8) p;
101 log_tab[p] = (u8) i;
102
103 p ^= (p << 1) ^ (p & 0x80 ? 0x01b : 0);
104 }
105
106 log_tab[1] = 0;
107
108 for (i = 0, p = 1; i < 10; ++i) {
109 rco_tab[i] = p;
110
111 p = (p << 1) ^ (p & 0x80 ? 0x01b : 0);
112 }
113
114 for (i = 0; i < 256; ++i) {
115 p = (i ? pow_tab[255 - log_tab[i]] : 0);
116 q = ((p >> 7) | (p << 1)) ^ ((p >> 6) | (p << 2));
117 p ^= 0x63 ^ q ^ ((q >> 6) | (q << 2));
118 sbx_tab[i] = p;
119 isb_tab[p] = (u8) i;
120 }
121
122 for (i = 0; i < 256; ++i) {
123 p = sbx_tab[i];
124
125 t = p;
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800126 crypto_fl_tab[0][i] = t;
127 crypto_fl_tab[1][i] = rol32(t, 8);
128 crypto_fl_tab[2][i] = rol32(t, 16);
129 crypto_fl_tab[3][i] = rol32(t, 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800131 t = ((u32) ff_mult(2, p)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 ((u32) p << 8) |
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800133 ((u32) p << 16) | ((u32) ff_mult(3, p) << 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800135 crypto_ft_tab[0][i] = t;
136 crypto_ft_tab[1][i] = rol32(t, 8);
137 crypto_ft_tab[2][i] = rol32(t, 16);
138 crypto_ft_tab[3][i] = rol32(t, 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 p = isb_tab[i];
141
142 t = p;
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800143 crypto_il_tab[0][i] = t;
144 crypto_il_tab[1][i] = rol32(t, 8);
145 crypto_il_tab[2][i] = rol32(t, 16);
146 crypto_il_tab[3][i] = rol32(t, 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800148 t = ((u32) ff_mult(14, p)) |
149 ((u32) ff_mult(9, p) << 8) |
150 ((u32) ff_mult(13, p) << 16) |
151 ((u32) ff_mult(11, p) << 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800153 crypto_it_tab[0][i] = t;
154 crypto_it_tab[1][i] = rol32(t, 8);
155 crypto_it_tab[2][i] = rol32(t, 16);
156 crypto_it_tab[3][i] = rol32(t, 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158}
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160/* initialise the key schedule from the user supplied key */
161
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800162#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800164#define imix_col(y,x) do { \
165 u = star_x(x); \
166 v = star_x(u); \
167 w = star_x(v); \
168 t = w ^ (x); \
169 (y) = u ^ v ^ w; \
170 (y) ^= ror32(u ^ t, 8) ^ \
171 ror32(v ^ t, 16) ^ \
172 ror32(t, 24); \
173} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800175#define ls_box(x) \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800176 crypto_fl_tab[0][byte(x, 0)] ^ \
177 crypto_fl_tab[1][byte(x, 1)] ^ \
178 crypto_fl_tab[2][byte(x, 2)] ^ \
179 crypto_fl_tab[3][byte(x, 3)]
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800180
181#define loop4(i) do { \
182 t = ror32(t, 8); \
183 t = ls_box(t) ^ rco_tab[i]; \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800184 t ^= ctx->key_enc[4 * i]; \
185 ctx->key_enc[4 * i + 4] = t; \
186 t ^= ctx->key_enc[4 * i + 1]; \
187 ctx->key_enc[4 * i + 5] = t; \
188 t ^= ctx->key_enc[4 * i + 2]; \
189 ctx->key_enc[4 * i + 6] = t; \
190 t ^= ctx->key_enc[4 * i + 3]; \
191 ctx->key_enc[4 * i + 7] = t; \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800192} while (0)
193
194#define loop6(i) do { \
195 t = ror32(t, 8); \
196 t = ls_box(t) ^ rco_tab[i]; \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800197 t ^= ctx->key_enc[6 * i]; \
198 ctx->key_enc[6 * i + 6] = t; \
199 t ^= ctx->key_enc[6 * i + 1]; \
200 ctx->key_enc[6 * i + 7] = t; \
201 t ^= ctx->key_enc[6 * i + 2]; \
202 ctx->key_enc[6 * i + 8] = t; \
203 t ^= ctx->key_enc[6 * i + 3]; \
204 ctx->key_enc[6 * i + 9] = t; \
205 t ^= ctx->key_enc[6 * i + 4]; \
206 ctx->key_enc[6 * i + 10] = t; \
207 t ^= ctx->key_enc[6 * i + 5]; \
208 ctx->key_enc[6 * i + 11] = t; \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800209} while (0)
210
211#define loop8(i) do { \
212 t = ror32(t, 8); \
213 t = ls_box(t) ^ rco_tab[i]; \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800214 t ^= ctx->key_enc[8 * i]; \
215 ctx->key_enc[8 * i + 8] = t; \
216 t ^= ctx->key_enc[8 * i + 1]; \
217 ctx->key_enc[8 * i + 9] = t; \
218 t ^= ctx->key_enc[8 * i + 2]; \
219 ctx->key_enc[8 * i + 10] = t; \
220 t ^= ctx->key_enc[8 * i + 3]; \
221 ctx->key_enc[8 * i + 11] = t; \
222 t = ctx->key_enc[8 * i + 4] ^ ls_box(t); \
223 ctx->key_enc[8 * i + 12] = t; \
224 t ^= ctx->key_enc[8 * i + 5]; \
225 ctx->key_enc[8 * i + 13] = t; \
226 t ^= ctx->key_enc[8 * i + 6]; \
227 ctx->key_enc[8 * i + 14] = t; \
228 t ^= ctx->key_enc[8 * i + 7]; \
229 ctx->key_enc[8 * i + 15] = t; \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800230} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800232int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800233 unsigned int key_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800235 struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
Herbert Xu06ace7a2005-10-30 21:25:15 +1100236 const __le32 *key = (const __le32 *)in_key;
Herbert Xu560c06a2006-08-13 14:16:39 +1000237 u32 *flags = &tfm->crt_flags;
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800238 u32 i, t, u, v, w, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Herbert Xu560c06a2006-08-13 14:16:39 +1000240 if (key_len % 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
242 return -EINVAL;
243 }
244
245 ctx->key_length = key_len;
246
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800247 ctx->key_dec[key_len + 24] = ctx->key_enc[0] = le32_to_cpu(key[0]);
248 ctx->key_dec[key_len + 25] = ctx->key_enc[1] = le32_to_cpu(key[1]);
249 ctx->key_dec[key_len + 26] = ctx->key_enc[2] = le32_to_cpu(key[2]);
250 ctx->key_dec[key_len + 27] = ctx->key_enc[3] = le32_to_cpu(key[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 switch (key_len) {
253 case 16:
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800254 t = ctx->key_enc[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 for (i = 0; i < 10; ++i)
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800256 loop4(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 break;
258
259 case 24:
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800260 ctx->key_enc[4] = le32_to_cpu(key[4]);
261 t = ctx->key_enc[5] = le32_to_cpu(key[5]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 for (i = 0; i < 8; ++i)
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800263 loop6(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 break;
265
266 case 32:
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800267 ctx->key_enc[4] = le32_to_cpu(key[4]);
268 ctx->key_enc[5] = le32_to_cpu(key[5]);
269 ctx->key_enc[6] = le32_to_cpu(key[6]);
270 t = ctx->key_enc[7] = le32_to_cpu(key[7]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 for (i = 0; i < 7; ++i)
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800272 loop8(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 break;
274 }
275
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800276 ctx->key_dec[0] = ctx->key_enc[key_len + 24];
277 ctx->key_dec[1] = ctx->key_enc[key_len + 25];
278 ctx->key_dec[2] = ctx->key_enc[key_len + 26];
279 ctx->key_dec[3] = ctx->key_enc[key_len + 27];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281 for (i = 4; i < key_len + 24; ++i) {
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800282 j = key_len + 24 - (i & ~3) + (i & 3);
283 imix_col(ctx->key_dec[j], ctx->key_enc[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return 0;
286}
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800287EXPORT_SYMBOL_GPL(crypto_aes_set_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289/* encrypt a block of text */
290
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800291#define f_rn(bo, bi, n, k) do { \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800292 bo[n] = crypto_ft_tab[0][byte(bi[n], 0)] ^ \
293 crypto_ft_tab[1][byte(bi[(n + 1) & 3], 1)] ^ \
294 crypto_ft_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
295 crypto_ft_tab[3][byte(bi[(n + 3) & 3], 3)] ^ *(k + n); \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800296} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800298#define f_nround(bo, bi, k) do {\
299 f_rn(bo, bi, 0, k); \
300 f_rn(bo, bi, 1, k); \
301 f_rn(bo, bi, 2, k); \
302 f_rn(bo, bi, 3, k); \
303 k += 4; \
304} while (0)
305
306#define f_rl(bo, bi, n, k) do { \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800307 bo[n] = crypto_fl_tab[0][byte(bi[n], 0)] ^ \
308 crypto_fl_tab[1][byte(bi[(n + 1) & 3], 1)] ^ \
309 crypto_fl_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
310 crypto_fl_tab[3][byte(bi[(n + 3) & 3], 3)] ^ *(k + n); \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800311} while (0)
312
313#define f_lround(bo, bi, k) do {\
314 f_rl(bo, bi, 0, k); \
315 f_rl(bo, bi, 1, k); \
316 f_rl(bo, bi, 2, k); \
317 f_rl(bo, bi, 3, k); \
318} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Herbert Xu6c2bb982006-05-16 22:09:29 +1000320static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800322 const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
Herbert Xu06ace7a2005-10-30 21:25:15 +1100323 const __le32 *src = (const __le32 *)in;
324 __le32 *dst = (__le32 *)out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 u32 b0[4], b1[4];
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800326 const u32 *kp = ctx->key_enc + 4;
327 const int key_len = ctx->key_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800329 b0[0] = le32_to_cpu(src[0]) ^ ctx->key_enc[0];
330 b0[1] = le32_to_cpu(src[1]) ^ ctx->key_enc[1];
331 b0[2] = le32_to_cpu(src[2]) ^ ctx->key_enc[2];
332 b0[3] = le32_to_cpu(src[3]) ^ ctx->key_enc[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800334 if (key_len > 24) {
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800335 f_nround(b1, b0, kp);
336 f_nround(b0, b1, kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 }
338
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800339 if (key_len > 16) {
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800340 f_nround(b1, b0, kp);
341 f_nround(b0, b1, kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
343
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800344 f_nround(b1, b0, kp);
345 f_nround(b0, b1, kp);
346 f_nround(b1, b0, kp);
347 f_nround(b0, b1, kp);
348 f_nround(b1, b0, kp);
349 f_nround(b0, b1, kp);
350 f_nround(b1, b0, kp);
351 f_nround(b0, b1, kp);
352 f_nround(b1, b0, kp);
353 f_lround(b0, b1, kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Herbert Xu06ace7a2005-10-30 21:25:15 +1100355 dst[0] = cpu_to_le32(b0[0]);
356 dst[1] = cpu_to_le32(b0[1]);
357 dst[2] = cpu_to_le32(b0[2]);
358 dst[3] = cpu_to_le32(b0[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360
361/* decrypt a block of text */
362
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800363#define i_rn(bo, bi, n, k) do { \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800364 bo[n] = crypto_it_tab[0][byte(bi[n], 0)] ^ \
365 crypto_it_tab[1][byte(bi[(n + 3) & 3], 1)] ^ \
366 crypto_it_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
367 crypto_it_tab[3][byte(bi[(n + 1) & 3], 3)] ^ *(k + n); \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800368} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800370#define i_nround(bo, bi, k) do {\
371 i_rn(bo, bi, 0, k); \
372 i_rn(bo, bi, 1, k); \
373 i_rn(bo, bi, 2, k); \
374 i_rn(bo, bi, 3, k); \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800375 k += 4; \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800376} while (0)
377
378#define i_rl(bo, bi, n, k) do { \
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800379 bo[n] = crypto_il_tab[0][byte(bi[n], 0)] ^ \
380 crypto_il_tab[1][byte(bi[(n + 3) & 3], 1)] ^ \
381 crypto_il_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
382 crypto_il_tab[3][byte(bi[(n + 1) & 3], 3)] ^ *(k + n); \
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800383} while (0)
384
385#define i_lround(bo, bi, k) do {\
386 i_rl(bo, bi, 0, k); \
387 i_rl(bo, bi, 1, k); \
388 i_rl(bo, bi, 2, k); \
389 i_rl(bo, bi, 3, k); \
390} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Herbert Xu6c2bb982006-05-16 22:09:29 +1000392static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800394 const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
Herbert Xu06ace7a2005-10-30 21:25:15 +1100395 const __le32 *src = (const __le32 *)in;
396 __le32 *dst = (__le32 *)out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 u32 b0[4], b1[4];
398 const int key_len = ctx->key_length;
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800399 const u32 *kp = ctx->key_dec + 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800401 b0[0] = le32_to_cpu(src[0]) ^ ctx->key_dec[0];
402 b0[1] = le32_to_cpu(src[1]) ^ ctx->key_dec[1];
403 b0[2] = le32_to_cpu(src[2]) ^ ctx->key_dec[2];
404 b0[3] = le32_to_cpu(src[3]) ^ ctx->key_dec[3];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 if (key_len > 24) {
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800407 i_nround(b1, b0, kp);
408 i_nround(b0, b1, kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
410
411 if (key_len > 16) {
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800412 i_nround(b1, b0, kp);
413 i_nround(b0, b1, kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 }
415
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800416 i_nround(b1, b0, kp);
417 i_nround(b0, b1, kp);
418 i_nround(b1, b0, kp);
419 i_nround(b0, b1, kp);
420 i_nround(b1, b0, kp);
421 i_nround(b0, b1, kp);
422 i_nround(b1, b0, kp);
423 i_nround(b0, b1, kp);
424 i_nround(b1, b0, kp);
425 i_lround(b0, b1, kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Herbert Xu06ace7a2005-10-30 21:25:15 +1100427 dst[0] = cpu_to_le32(b0[0]);
428 dst[1] = cpu_to_le32(b0[1]);
429 dst[2] = cpu_to_le32(b0[2]);
430 dst[3] = cpu_to_le32(b0[3]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433static struct crypto_alg aes_alg = {
434 .cra_name = "aes",
Herbert Xuc8a19c92005-11-05 18:06:26 +1100435 .cra_driver_name = "aes-generic",
436 .cra_priority = 100,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
438 .cra_blocksize = AES_BLOCK_SIZE,
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800439 .cra_ctxsize = sizeof(struct crypto_aes_ctx),
Herbert Xua429d262006-01-07 16:38:15 +1100440 .cra_alignmask = 3,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 .cra_module = THIS_MODULE,
442 .cra_list = LIST_HEAD_INIT(aes_alg.cra_list),
443 .cra_u = {
444 .cipher = {
445 .cia_min_keysize = AES_MIN_KEY_SIZE,
446 .cia_max_keysize = AES_MAX_KEY_SIZE,
Sebastian Siewior96e82e42007-11-08 21:20:30 +0800447 .cia_setkey = crypto_aes_set_key,
Sebastian Siewiorbe5fb272007-11-08 20:39:26 +0800448 .cia_encrypt = aes_encrypt,
449 .cia_decrypt = aes_decrypt
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
451 }
452};
453
454static int __init aes_init(void)
455{
456 gen_tabs();
457 return crypto_register_alg(&aes_alg);
458}
459
460static void __exit aes_fini(void)
461{
462 crypto_unregister_alg(&aes_alg);
463}
464
465module_init(aes_init);
466module_exit(aes_fini);
467
468MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
469MODULE_LICENSE("Dual BSD/GPL");
Sebastian Siewiorf8246af2007-10-05 16:52:01 +0800470MODULE_ALIAS("aes");