6b13f685e
 김민수
BSP 최초 추가
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
|
/*
* linux/arch/arm/crypto/aesbs-glue.c - glue code for NEON bit sliced AES
*
* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <asm/neon.h>
#include <crypto/aes.h>
#include <crypto/ablk_helper.h>
#include <crypto/algapi.h>
#include <linux/module.h>
#include "aes_glue.h"
#define BIT_SLICED_KEY_MAXSIZE (128 * (AES_MAXNR - 1) + 2 * AES_BLOCK_SIZE)
struct BS_KEY {
struct AES_KEY rk;
int converted;
u8 __aligned(8) bs[BIT_SLICED_KEY_MAXSIZE];
} __aligned(8);
asmlinkage void bsaes_enc_key_convert(u8 out[], struct AES_KEY const *in);
asmlinkage void bsaes_dec_key_convert(u8 out[], struct AES_KEY const *in);
asmlinkage void bsaes_cbc_encrypt(u8 const in[], u8 out[], u32 bytes,
struct BS_KEY *key, u8 iv[]);
asmlinkage void bsaes_ctr32_encrypt_blocks(u8 const in[], u8 out[], u32 blocks,
struct BS_KEY *key, u8 const iv[]);
asmlinkage void bsaes_xts_encrypt(u8 const in[], u8 out[], u32 bytes,
struct BS_KEY *key, u8 tweak[]);
asmlinkage void bsaes_xts_decrypt(u8 const in[], u8 out[], u32 bytes,
struct BS_KEY *key, u8 tweak[]);
struct aesbs_cbc_ctx {
struct AES_KEY enc;
struct BS_KEY dec;
};
struct aesbs_ctr_ctx {
struct BS_KEY enc;
};
struct aesbs_xts_ctx {
struct BS_KEY enc;
struct BS_KEY dec;
struct AES_KEY twkey;
};
static int aesbs_cbc_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct aesbs_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
int bits = key_len * 8;
if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
ctx->dec.rk = ctx->enc;
private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
ctx->dec.converted = 0;
return 0;
}
static int aesbs_ctr_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct aesbs_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
int bits = key_len * 8;
if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
ctx->enc.converted = 0;
return 0;
}
static int aesbs_xts_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct aesbs_xts_ctx *ctx = crypto_tfm_ctx(tfm);
int bits = key_len * 4;
if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
ctx->dec.rk = ctx->enc.rk;
private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
private_AES_set_encrypt_key(in_key + key_len / 2, bits, &ctx->twkey);
ctx->enc.converted = ctx->dec.converted = 0;
return 0;
}
static int aesbs_cbc_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct aesbs_cbc_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
while (walk.nbytes) {
u32 blocks = walk.nbytes / AES_BLOCK_SIZE;
u8 *src = walk.src.virt.addr;
if (walk.dst.virt.addr == walk.src.virt.addr) {
u8 *iv = walk.iv;
do {
crypto_xor(src, iv, AES_BLOCK_SIZE);
AES_encrypt(src, src, &ctx->enc);
iv = src;
src += AES_BLOCK_SIZE;
} while (--blocks);
memcpy(walk.iv, iv, AES_BLOCK_SIZE);
} else {
u8 *dst = walk.dst.virt.addr;
do {
crypto_xor(walk.iv, src, AES_BLOCK_SIZE);
AES_encrypt(walk.iv, dst, &ctx->enc);
memcpy(walk.iv, dst, AES_BLOCK_SIZE);
src += AES_BLOCK_SIZE;
dst += AES_BLOCK_SIZE;
} while (--blocks);
}
err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
}
return err;
}
static int aesbs_cbc_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct aesbs_cbc_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
while ((walk.nbytes / AES_BLOCK_SIZE) >= 8) {
kernel_neon_begin();
bsaes_cbc_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
walk.nbytes, &ctx->dec, walk.iv);
kernel_neon_end();
err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
}
while (walk.nbytes) {
u32 blocks = walk.nbytes / AES_BLOCK_SIZE;
u8 *dst = walk.dst.virt.addr;
u8 *src = walk.src.virt.addr;
u8 bk[2][AES_BLOCK_SIZE];
u8 *iv = walk.iv;
do {
if (walk.dst.virt.addr == walk.src.virt.addr)
memcpy(bk[blocks & 1], src, AES_BLOCK_SIZE);
AES_decrypt(src, dst, &ctx->dec.rk);
crypto_xor(dst, iv, AES_BLOCK_SIZE);
if (walk.dst.virt.addr == walk.src.virt.addr)
iv = bk[blocks & 1];
else
iv = src;
dst += AES_BLOCK_SIZE;
src += AES_BLOCK_SIZE;
} while (--blocks);
err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
}
return err;
}
static void inc_be128_ctr(__be32 ctr[], u32 addend)
{
int i;
for (i = 3; i >= 0; i--, addend = 1) {
u32 n = be32_to_cpu(ctr[i]) + addend;
ctr[i] = cpu_to_be32(n);
if (n >= addend)
break;
}
}
static int aesbs_ctr_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct aesbs_ctr_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
u32 blocks;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
while ((blocks = walk.nbytes / AES_BLOCK_SIZE)) {
u32 tail = walk.nbytes % AES_BLOCK_SIZE;
__be32 *ctr = (__be32 *)walk.iv;
u32 headroom = UINT_MAX - be32_to_cpu(ctr[3]);
/* avoid 32 bit counter overflow in the NEON code */
if (unlikely(headroom < blocks)) {
blocks = headroom + 1;
tail = walk.nbytes - blocks * AES_BLOCK_SIZE;
}
kernel_neon_begin();
bsaes_ctr32_encrypt_blocks(walk.src.virt.addr,
walk.dst.virt.addr, blocks,
&ctx->enc, walk.iv);
kernel_neon_end();
inc_be128_ctr(ctr, blocks);
nbytes -= blocks * AES_BLOCK_SIZE;
if (nbytes && nbytes == tail && nbytes <= AES_BLOCK_SIZE)
break;
err = blkcipher_walk_done(desc, &walk, tail);
}
if (walk.nbytes) {
u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
u8 ks[AES_BLOCK_SIZE];
AES_encrypt(walk.iv, ks, &ctx->enc.rk);
if (tdst != tsrc)
memcpy(tdst, tsrc, nbytes);
crypto_xor(tdst, ks, nbytes);
err = blkcipher_walk_done(desc, &walk, 0);
}
return err;
}
static int aesbs_xts_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct aesbs_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
/* generate the initial tweak */
AES_encrypt(walk.iv, walk.iv, &ctx->twkey);
while (walk.nbytes) {
kernel_neon_begin();
bsaes_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
walk.nbytes, &ctx->enc, walk.iv);
kernel_neon_end();
err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
}
return err;
}
static int aesbs_xts_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct aesbs_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt_block(desc, &walk, 8 * AES_BLOCK_SIZE);
/* generate the initial tweak */
AES_encrypt(walk.iv, walk.iv, &ctx->twkey);
while (walk.nbytes) {
kernel_neon_begin();
bsaes_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
walk.nbytes, &ctx->dec, walk.iv);
kernel_neon_end();
err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
}
return err;
}
static struct crypto_alg aesbs_algs[] = { {
.cra_name = "__cbc-aes-neonbs",
.cra_driver_name = "__driver-cbc-aes-neonbs",
.cra_priority = 0,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct aesbs_cbc_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_blkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = aesbs_cbc_set_key,
.encrypt = aesbs_cbc_encrypt,
.decrypt = aesbs_cbc_decrypt,
},
}, {
.cra_name = "__ctr-aes-neonbs",
.cra_driver_name = "__driver-ctr-aes-neonbs",
.cra_priority = 0,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct aesbs_ctr_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_blkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = aesbs_ctr_set_key,
.encrypt = aesbs_ctr_encrypt,
.decrypt = aesbs_ctr_encrypt,
},
}, {
.cra_name = "__xts-aes-neonbs",
.cra_driver_name = "__driver-xts-aes-neonbs",
.cra_priority = 0,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct aesbs_xts_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_blkcipher = {
.min_keysize = 2 * AES_MIN_KEY_SIZE,
.max_keysize = 2 * AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = aesbs_xts_set_key,
.encrypt = aesbs_xts_encrypt,
.decrypt = aesbs_xts_decrypt,
},
}, {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-neonbs",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = __ablk_encrypt,
.decrypt = ablk_decrypt,
}
}, {
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-neonbs",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
}
}, {
.cra_name = "xts(aes)",
.cra_driver_name = "xts-aes-neonbs",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct async_helper_ctx),
.cra_alignmask = 7,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = ablk_init,
.cra_exit = ablk_exit,
.cra_ablkcipher = {
.min_keysize = 2 * AES_MIN_KEY_SIZE,
.max_keysize = 2 * AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = ablk_set_key,
.encrypt = ablk_encrypt,
.decrypt = ablk_decrypt,
}
} };
static int __init aesbs_mod_init(void)
{
if (!cpu_has_neon())
return -ENODEV;
return crypto_register_algs(aesbs_algs, ARRAY_SIZE(aesbs_algs));
}
static void __exit aesbs_mod_exit(void)
{
crypto_unregister_algs(aesbs_algs, ARRAY_SIZE(aesbs_algs));
}
module_init(aesbs_mod_init);
module_exit(aesbs_mod_exit);
MODULE_DESCRIPTION("Bit sliced AES in CBC/CTR/XTS modes using NEON");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL");
|