summaryrefslogtreecommitdiffstats
path: root/arch/x86/crypto/cast5_avx_glue.c
blob: d1ce49119da87d68fb91c88c1d83b0abe794447e (plain)
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
/*
 * Glue Code for the AVX assembler implementation of the Cast5 Cipher
 *
 * Copyright (C) 2012 Johannes Goetzfried
 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 */

#include <asm/crypto/glue_helper.h>
#include <crypto/algapi.h>
#include <crypto/cast5.h>
#include <crypto/internal/simd.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/types.h>

#define CAST5_PARALLEL_BLOCKS 16

asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
				    const u8 *src);
asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
				    const u8 *src);
asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
				    const u8 *src);
asmlinkage void cast5_ctr_16way(struct cast5_ctx *ctx, u8 *dst, const u8 *src,
				__be64 *iv);

static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
				 unsigned int keylen)
{
	return cast5_setkey(&tfm->base, key, keylen);
}

static inline bool cast5_fpu_begin(bool fpu_enabled, struct skcipher_walk *walk,
				   unsigned int nbytes)
{
	return glue_fpu_begin(CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS,
			      walk, fpu_enabled, nbytes);
}

static inline void cast5_fpu_end(bool fpu_enabled)
{
	return glue_fpu_end(fpu_enabled);
}

static int ecb_crypt(struct skcipher_request *req, bool enc)
{
	bool fpu_enabled = false;
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	unsigned int nbytes;
	void (*fn)(struct cast5_ctx *ctx, u8 *dst, const u8 *src);
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while ((nbytes = walk.nbytes)) {
		u8 *wsrc = walk.src.virt.addr;
		u8 *wdst = walk.dst.virt.addr;

		fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);

		/* Process multi-block batch */
		if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
			fn = (enc) ? cast5_ecb_enc_16way : cast5_ecb_dec_16way;
			do {
				fn(ctx, wdst, wsrc);

				wsrc += bsize * CAST5_PARALLEL_BLOCKS;
				wdst += bsize * CAST5_PARALLEL_BLOCKS;
				nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
			} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);

			if (nbytes < bsize)
				goto done;
		}

		fn = (enc) ? __cast5_encrypt : __cast5_decrypt;

		/* Handle leftovers */
		do {
			fn(ctx, wdst, wsrc);

			wsrc += bsize;
			wdst += bsize;
			nbytes -= bsize;
		} while (nbytes >= bsize);

done:
		err = skcipher_walk_done(&walk, nbytes);
	}

	cast5_fpu_end(fpu_enabled);
	return err;
}

static int ecb_encrypt(struct skcipher_request *req)
{
	return ecb_crypt(req, true);
}

static int ecb_decrypt(struct skcipher_request *req)
{
	return ecb_crypt(req, false);
}

static int cbc_encrypt(struct skcipher_request *req)
{
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while ((nbytes = walk.nbytes)) {
		u64 *src = (u64 *)walk.src.virt.addr;
		u64 *dst = (u64 *)walk.dst.virt.addr;
		u64 *iv = (u64 *)walk.iv;

		do {
			*dst = *src ^ *iv;
			__cast5_encrypt(ctx, (u8 *)dst, (u8 *)dst);
			iv = dst;
			src++;
			dst++;
			nbytes -= bsize;
		} while (nbytes >= bsize);

		*(u64 *)walk.iv = *iv;
		err = skcipher_walk_done(&walk, nbytes);
	}

	return err;
}

static unsigned int __cbc_decrypt(struct cast5_ctx *ctx,
				  struct skcipher_walk *walk)
{
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 *src = (u64 *)walk->src.virt.addr;
	u64 *dst = (u64 *)walk->dst.virt.addr;
	u64 last_iv;

	/* Start of the last block. */
	src += nbytes / bsize - 1;
	dst += nbytes / bsize - 1;

	last_iv = *src;

	/* Process multi-block batch */
	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
		do {
			nbytes -= bsize * (CAST5_PARALLEL_BLOCKS - 1);
			src -= CAST5_PARALLEL_BLOCKS - 1;
			dst -= CAST5_PARALLEL_BLOCKS - 1;

			cast5_cbc_dec_16way(ctx, (u8 *)dst, (u8 *)src);

			nbytes -= bsize;
			if (nbytes < bsize)
				goto done;

			*dst ^= *(src - 1);
			src -= 1;
			dst -= 1;
		} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);
	}

	/* Handle leftovers */
	for (;;) {
		__cast5_decrypt(ctx, (u8 *)dst, (u8 *)src);

		nbytes -= bsize;
		if (nbytes < bsize)
			break;

		*dst ^= *(src - 1);
		src -= 1;
		dst -= 1;
	}

done:
	*dst ^= *(u64 *)walk->iv;
	*(u64 *)walk->iv = last_iv;

	return nbytes;
}

static int cbc_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
	bool fpu_enabled = false;
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while ((nbytes = walk.nbytes)) {
		fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
		nbytes = __cbc_decrypt(ctx, &walk);
		err = skcipher_walk_done(&walk, nbytes);
	}

	cast5_fpu_end(fpu_enabled);
	return err;
}

static void ctr_crypt_final(struct skcipher_walk *walk, struct cast5_ctx *ctx)
{
	u8 *ctrblk = walk->iv;
	u8 keystream[CAST5_BLOCK_SIZE];
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	unsigned int nbytes = walk->nbytes;

	__cast5_encrypt(ctx, keystream, ctrblk);
	crypto_xor_cpy(dst, keystream, src, nbytes);

	crypto_inc(ctrblk, CAST5_BLOCK_SIZE);
}

static unsigned int __ctr_crypt(struct skcipher_walk *walk,
				struct cast5_ctx *ctx)
{
	const unsigned int bsize = CAST5_BLOCK_SIZE;
	unsigned int nbytes = walk->nbytes;
	u64 *src = (u64 *)walk->src.virt.addr;
	u64 *dst = (u64 *)walk->dst.virt.addr;

	/* Process multi-block batch */
	if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
		do {
			cast5_ctr_16way(ctx, (u8 *)dst, (u8 *)src,
					(__be64 *)walk->iv);

			src += CAST5_PARALLEL_BLOCKS;
			dst += CAST5_PARALLEL_BLOCKS;
			nbytes -= bsize * CAST5_PARALLEL_BLOCKS;
		} while (nbytes >= bsize * CAST5_PARALLEL_BLOCKS);

		if (nbytes < bsize)
			goto done;
	}

	/* Handle leftovers */
	do {
		u64 ctrblk;

		if (dst != src)
			*dst = *src;

		ctrblk = *(u64 *)walk->iv;
		be64_add_cpu((__be64 *)walk->iv, 1);

		__cast5_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
		*dst ^= ctrblk;

		src += 1;
		dst += 1;
		nbytes -= bsize;
	} while (nbytes >= bsize);

done:
	return nbytes;
}

static int ctr_crypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct cast5_ctx *ctx = crypto_skcipher_ctx(tfm);
	bool fpu_enabled = false;
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
		fpu_enabled = cast5_fpu_begin(fpu_enabled, &walk, nbytes);
		nbytes = __ctr_crypt(&walk, ctx);
		err = skcipher_walk_done(&walk, nbytes);
	}

	cast5_fpu_end(fpu_enabled);

	if (walk.nbytes) {
		ctr_crypt_final(&walk, ctx);
		err = skcipher_walk_done(&walk, 0);
	}

	return err;
}

static struct skcipher_alg cast5_algs[] = {
	{
		.base.cra_name		= "__ecb(cast5)",
		.base.cra_driver_name	= "__ecb-cast5-avx",
		.base.cra_priority	= 200,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= CAST5_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct cast5_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= CAST5_MIN_KEY_SIZE,
		.max_keysize		= CAST5_MAX_KEY_SIZE,
		.setkey			= cast5_setkey_skcipher,
		.encrypt		= ecb_encrypt,
		.decrypt		= ecb_decrypt,
	}, {
		.base.cra_name		= "__cbc(cast5)",
		.base.cra_driver_name	= "__cbc-cast5-avx",
		.base.cra_priority	= 200,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= CAST5_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct cast5_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= CAST5_MIN_KEY_SIZE,
		.max_keysize		= CAST5_MAX_KEY_SIZE,
		.ivsize			= CAST5_BLOCK_SIZE,
		.setkey			= cast5_setkey_skcipher,
		.encrypt		= cbc_encrypt,
		.decrypt		= cbc_decrypt,
	}, {
		.base.cra_name		= "__ctr(cast5)",
		.base.cra_driver_name	= "__ctr-cast5-avx",
		.base.cra_priority	= 200,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= 1,
		.base.cra_ctxsize	= sizeof(struct cast5_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= CAST5_MIN_KEY_SIZE,
		.max_keysize		= CAST5_MAX_KEY_SIZE,
		.ivsize			= CAST5_BLOCK_SIZE,
		.chunksize		= CAST5_BLOCK_SIZE,
		.setkey			= cast5_setkey_skcipher,
		.encrypt		= ctr_crypt,
		.decrypt		= ctr_crypt,
	}
};

static struct simd_skcipher_alg *cast5_simd_algs[ARRAY_SIZE(cast5_algs)];

static int __init cast5_init(void)
{
	const char *feature_name;

	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
				&feature_name)) {
		pr_info("CPU feature '%s' is not supported.\n", feature_name);
		return -ENODEV;
	}

	return simd_register_skciphers_compat(cast5_algs,
					      ARRAY_SIZE(cast5_algs),
					      cast5_simd_algs);
}

static void __exit cast5_exit(void)
{
	simd_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs),
				  cast5_simd_algs);
}

module_init(cast5_init);
module_exit(cast5_exit);

MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("cast5");