aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/crypto/des_glue.c
blob: 5ec0309e48c081a54aa144b3a6865acb6cd68fb5 (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
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
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
/* Glue code for DES encryption optimized for sparc64 crypto opcodes.
 *
 * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
 */

#include <linux/crypto.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/algapi.h>
#include <crypto/des.h>

#include <asm/fpumacro.h>
#include <asm/pstate.h>
#include <asm/elf.h>

struct des_sparc64_ctx {
	u64 encrypt_expkey[DES_EXPKEY_WORDS / 2];
	u64 decrypt_expkey[DES_EXPKEY_WORDS / 2];
};

struct des3_ede_sparc64_ctx {
	u64 encrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
	u64 decrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
};

static void encrypt_to_decrypt(u64 *d, const u64 *e)
{
	const u64 *s = e + (DES_EXPKEY_WORDS / 2) - 1;
	int i;

	for (i = 0; i < DES_EXPKEY_WORDS / 2; i++)
		*d++ = *s--;
}

extern void des_sparc64_key_expand(const u32 *input_key, u64 *key);

static int des_set_key(struct crypto_tfm *tfm, const u8 *key,
		       unsigned int keylen)
{
	struct des_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
	u32 *flags = &tfm->crt_flags;
	u32 tmp[DES_EXPKEY_WORDS];
	int ret;

	/* Even though we have special instructions for key expansion,
	 * we call des_ekey() so that we don't have to write our own
	 * weak key detection code.
	 */
	ret = des_ekey(tmp, key);
	if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
		return -EINVAL;
	}

	des_sparc64_key_expand((const u32 *) key, &dctx->encrypt_expkey[0]);
	encrypt_to_decrypt(&dctx->decrypt_expkey[0], &dctx->encrypt_expkey[0]);

	return 0;
}

extern void des_sparc64_crypt(const u64 *key, const u64 *input,
			      u64 *output);

static void des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
	const u64 *K = ctx->encrypt_expkey;

	des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}

static void des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
	const u64 *K = ctx->decrypt_expkey;

	des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}

extern void des_sparc64_load_keys(const u64 *key);

extern void des_sparc64_ecb_crypt(const u64 *input, u64 *output,
				  unsigned int len);

#define DES_BLOCK_MASK	(~(DES_BLOCK_SIZE - 1))

static int __ecb_crypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes, bool encrypt)
{
	struct des_sparc64_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);

	if (encrypt)
		des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
	else
		des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
	while ((nbytes = walk.nbytes)) {
		unsigned int block_len = nbytes & DES_BLOCK_MASK;

		if (likely(block_len)) {
			des_sparc64_ecb_crypt((const u64 *)walk.src.virt.addr,
					      (u64 *) walk.dst.virt.addr,
					      block_len);
		}
		nbytes &= DES_BLOCK_SIZE - 1;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}
	fprs_write(0);
	return err;
}

static int ecb_encrypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes)
{
	return __ecb_crypt(desc, dst, src, nbytes, true);
}

static int ecb_decrypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes)
{
	return __ecb_crypt(desc, dst, src, nbytes, false);
}

extern void des_sparc64_cbc_encrypt(const u64 *input, u64 *output,
				    unsigned int len, u64 *iv);

static int cbc_encrypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes)
{
	struct des_sparc64_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);

	des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
	while ((nbytes = walk.nbytes)) {
		unsigned int block_len = nbytes & DES_BLOCK_MASK;

		if (likely(block_len)) {
			des_sparc64_cbc_encrypt((const u64 *)walk.src.virt.addr,
						(u64 *) walk.dst.virt.addr,
						block_len, (u64 *) walk.iv);
		}
		nbytes &= DES_BLOCK_SIZE - 1;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}
	fprs_write(0);
	return err;
}

extern void des_sparc64_cbc_decrypt(const u64 *input, u64 *output,
				    unsigned int len, u64 *iv);

static int cbc_decrypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes)
{
	struct des_sparc64_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);

	des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
	while ((nbytes = walk.nbytes)) {
		unsigned int block_len = nbytes & DES_BLOCK_MASK;

		if (likely(block_len)) {
			des_sparc64_cbc_decrypt((const u64 *)walk.src.virt.addr,
						(u64 *) walk.dst.virt.addr,
						block_len, (u64 *) walk.iv);
		}
		nbytes &= DES_BLOCK_SIZE - 1;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}
	fprs_write(0);
	return err;
}

static int des3_ede_set_key(struct crypto_tfm *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct des3_ede_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
	const u32 *K = (const u32 *)key;
	u32 *flags = &tfm->crt_flags;
	u64 k1[DES_EXPKEY_WORDS / 2];
	u64 k2[DES_EXPKEY_WORDS / 2];
	u64 k3[DES_EXPKEY_WORDS / 2];

	if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
		     !((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
		     (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
		*flags |= CRYPTO_TFM_RES_WEAK_KEY;
		return -EINVAL;
	}

	des_sparc64_key_expand((const u32 *)key, k1);
	key += DES_KEY_SIZE;
	des_sparc64_key_expand((const u32 *)key, k2);
	key += DES_KEY_SIZE;
	des_sparc64_key_expand((const u32 *)key, k3);

	memcpy(&dctx->encrypt_expkey[0], &k1[0], sizeof(k1));
	encrypt_to_decrypt(&dctx->encrypt_expkey[DES_EXPKEY_WORDS / 2], &k2[0]);
	memcpy(&dctx->encrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
	       &k3[0], sizeof(k3));

	encrypt_to_decrypt(&dctx->decrypt_expkey[0], &k3[0]);
	memcpy(&dctx->decrypt_expkey[DES_EXPKEY_WORDS / 2],
	       &k2[0], sizeof(k2));
	encrypt_to_decrypt(&dctx->decrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
			   &k1[0]);

	return 0;
}

extern void des3_ede_sparc64_crypt(const u64 *key, const u64 *input,
				   u64 *output);

static void des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
	const u64 *K = ctx->encrypt_expkey;

	des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}

static void des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
	const u64 *K = ctx->decrypt_expkey;

	des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
}

extern void des3_ede_sparc64_load_keys(const u64 *key);

extern void des3_ede_sparc64_ecb_crypt(const u64 *expkey, const u64 *input,
				       u64 *output, unsigned int len);

static int __ecb3_crypt(struct blkcipher_desc *desc,
			struct scatterlist *dst, struct scatterlist *src,
			unsigned int nbytes, bool encrypt)
{
	struct des3_ede_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	const u64 *K;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	if (encrypt)
		K = &ctx->encrypt_expkey[0];
	else
		K = &ctx->decrypt_expkey[0];
	des3_ede_sparc64_load_keys(K);
	while ((nbytes = walk.nbytes)) {
		unsigned int block_len = nbytes & DES_BLOCK_MASK;

		if (likely(block_len)) {
			const u64 *src64 = (const u64 *)walk.src.virt.addr;
			des3_ede_sparc64_ecb_crypt(K, src64,
						   (u64 *) walk.dst.virt.addr,
						   block_len);
		}
		nbytes &= DES_BLOCK_SIZE - 1;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}
	fprs_write(0);
	return err;
}

static int ecb3_encrypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes)
{
	return __ecb3_crypt(desc, dst, src, nbytes, true);
}

static int ecb3_decrypt(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes)
{
	return __ecb3_crypt(desc, dst, src, nbytes, false);
}

extern void des3_ede_sparc64_cbc_encrypt(const u64 *expkey, const u64 *input,
					 u64 *output, unsigned int len,
					 u64 *iv);

static int cbc3_encrypt(struct blkcipher_desc *desc,
			struct scatterlist *dst, struct scatterlist *src,
			unsigned int nbytes)
{
	struct des3_ede_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	const u64 *K;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	K = &ctx->encrypt_expkey[0];
	des3_ede_sparc64_load_keys(K);
	while ((nbytes = walk.nbytes)) {
		unsigned int block_len = nbytes & DES_BLOCK_MASK;

		if (likely(block_len)) {
			const u64 *src64 = (const u64 *)walk.src.virt.addr;
			des3_ede_sparc64_cbc_encrypt(K, src64,
						     (u64 *) walk.dst.virt.addr,
						     block_len,
						     (u64 *) walk.iv);
		}
		nbytes &= DES_BLOCK_SIZE - 1;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}
	fprs_write(0);
	return err;
}

extern void des3_ede_sparc64_cbc_decrypt(const u64 *expkey, const u64 *input,
					 u64 *output, unsigned int len,
					 u64 *iv);

static int cbc3_decrypt(struct blkcipher_desc *desc,
			struct scatterlist *dst, struct scatterlist *src,
			unsigned int nbytes)
{
	struct des3_ede_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;
	const u64 *K;
	int err;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	K = &ctx->decrypt_expkey[0];
	des3_ede_sparc64_load_keys(K);
	while ((nbytes = walk.nbytes)) {
		unsigned int block_len = nbytes & DES_BLOCK_MASK;

		if (likely(block_len)) {
			const u64 *src64 = (const u64 *)walk.src.virt.addr;
			des3_ede_sparc64_cbc_decrypt(K, src64,
						     (u64 *) walk.dst.virt.addr,
						     block_len,
						     (u64 *) walk.iv);
		}
		nbytes &= DES_BLOCK_SIZE - 1;
		err = blkcipher_walk_done(desc, &walk, nbytes);
	}
	fprs_write(0);
	return err;
}

static struct crypto_alg algs[] = { {
	.cra_name		= "des",
	.cra_driver_name	= "des-sparc64",
	.cra_priority		= 150,
	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		= DES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct des_sparc64_ctx),
	.cra_alignmask		= 7,
	.cra_module		= THIS_MODULE,
	.cra_u	= {
		.cipher	= {
			.cia_min_keysize	= DES_KEY_SIZE,
			.cia_max_keysize	= DES_KEY_SIZE,
			.cia_setkey		= des_set_key,
			.cia_encrypt		= des_encrypt,
			.cia_decrypt		= des_decrypt
		}
	}
}, {
	.cra_name		= "ecb(des)",
	.cra_driver_name	= "ecb-des-sparc64",
	.cra_priority		= 150,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= DES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct des_sparc64_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= DES_KEY_SIZE,
			.max_keysize	= DES_KEY_SIZE,
			.setkey		= des_set_key,
			.encrypt	= ecb_encrypt,
			.decrypt	= ecb_decrypt,
		},
	},
}, {
	.cra_name		= "cbc(des)",
	.cra_driver_name	= "cbc-des-sparc64",
	.cra_priority		= 150,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= DES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct des_sparc64_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= DES_KEY_SIZE,
			.max_keysize	= DES_KEY_SIZE,
			.setkey		= des_set_key,
			.encrypt	= cbc_encrypt,
			.decrypt	= cbc_decrypt,
		},
	},
}, {
	.cra_name		= "des3_ede",
	.cra_driver_name	= "des3_ede-sparc64",
	.cra_priority		= 150,
	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct des3_ede_sparc64_ctx),
	.cra_alignmask		= 7,
	.cra_module		= THIS_MODULE,
	.cra_u	= {
		.cipher	= {
			.cia_min_keysize	= DES3_EDE_KEY_SIZE,
			.cia_max_keysize	= DES3_EDE_KEY_SIZE,
			.cia_setkey		= des3_ede_set_key,
			.cia_encrypt		= des3_ede_encrypt,
			.cia_decrypt		= des3_ede_decrypt
		}
	}
}, {
	.cra_name		= "ecb(des3_ede)",
	.cra_driver_name	= "ecb-des3_ede-sparc64",
	.cra_priority		= 150,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct des3_ede_sparc64_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= DES3_EDE_KEY_SIZE,
			.max_keysize	= DES3_EDE_KEY_SIZE,
			.setkey		= des3_ede_set_key,
			.encrypt	= ecb3_encrypt,
			.decrypt	= ecb3_decrypt,
		},
	},
}, {
	.cra_name		= "cbc(des3_ede)",
	.cra_driver_name	= "cbc-des3_ede-sparc64",
	.cra_priority		= 150,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		= DES3_EDE_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct des3_ede_sparc64_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_u = {
		.blkcipher = {
			.min_keysize	= DES3_EDE_KEY_SIZE,
			.max_keysize	= DES3_EDE_KEY_SIZE,
			.setkey		= des3_ede_set_key,
			.encrypt	= cbc3_encrypt,
			.decrypt	= cbc3_decrypt,
		},
	},
} };

static bool __init sparc64_has_des_opcode(void)
{
	unsigned long cfr;

	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
		return false;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	if (!(cfr & CFR_DES))
		return false;

	return true;
}

static int __init des_sparc64_mod_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(algs); i++)
		INIT_LIST_HEAD(&algs[i].cra_list);

	if (sparc64_has_des_opcode()) {
		pr_info("Using sparc64 des opcodes optimized DES implementation\n");
		return crypto_register_algs(algs, ARRAY_SIZE(algs));
	}
	pr_info("sparc64 des opcodes not available.\n");
	return -ENODEV;
}

static void __exit des_sparc64_mod_fini(void)
{
	crypto_unregister_algs(algs, ARRAY_SIZE(algs));
}

module_init(des_sparc64_mod_init);
module_exit(des_sparc64_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms, sparc64 des opcode accelerated");

MODULE_ALIAS("des");