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Merge tag 'iomap-4.21-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
[linux/fpc-iii.git] / drivers / crypto / padlock-sha.c
blob21e5cae0a1e046ee84176569cd23c908af736a4d
1 /*
2 * Cryptographic API.
3 *
4 * Support for VIA PadLock hardware crypto engine.
5 *
6 * Copyright (c) 2006 Michal Ludvig <michal@logix.cz>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14
15 #include <crypto/internal/hash.h>
16 #include <crypto/padlock.h>
17 #include <crypto/sha.h>
18 #include <linux/err.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/interrupt.h>
23 #include <linux/kernel.h>
24 #include <linux/scatterlist.h>
25 #include <asm/cpu_device_id.h>
26 #include <asm/fpu/api.h>
27
28 struct padlock_sha_desc {
29 struct shash_desc fallback;
30 };
31
32 struct padlock_sha_ctx {
33 struct crypto_shash *fallback;
34 };
35
36 static int padlock_sha_init(struct shash_desc *desc)
37 {
38 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
39 struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
40
41 dctx->fallback.tfm = ctx->fallback;
42 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
43 return crypto_shash_init(&dctx->fallback);
44 }
45
46 static int padlock_sha_update(struct shash_desc *desc,
47 const u8 *data, unsigned int length)
48 {
49 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
50
51 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
52 return crypto_shash_update(&dctx->fallback, data, length);
53 }
54
55 static int padlock_sha_export(struct shash_desc *desc, void *out)
56 {
57 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
58
59 return crypto_shash_export(&dctx->fallback, out);
60 }
61
62 static int padlock_sha_import(struct shash_desc *desc, const void *in)
63 {
64 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
65 struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
66
67 dctx->fallback.tfm = ctx->fallback;
68 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
69 return crypto_shash_import(&dctx->fallback, in);
70 }
71
72 static inline void padlock_output_block(uint32_t *src,
73 uint32_t *dst, size_t count)
74 {
75 while (count--)
76 *dst++ = swab32(*src++);
77 }
78
79 static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
80 unsigned int count, u8 *out)
81 {
82 /* We can't store directly to *out as it may be unaligned. */
83 /* BTW Don't reduce the buffer size below 128 Bytes!
84 * PadLock microcode needs it that big. */
85 char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
86 ((aligned(STACK_ALIGN)));
87 char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
88 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
89 struct sha1_state state;
90 unsigned int space;
91 unsigned int leftover;
92 int err;
93
94 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
95 err = crypto_shash_export(&dctx->fallback, &state);
96 if (err)
97 goto out;
98
99 if (state.count + count > ULONG_MAX)
100 return crypto_shash_finup(&dctx->fallback, in, count, out);
101
102 leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
103 space = SHA1_BLOCK_SIZE - leftover;
104 if (space) {
105 if (count > space) {
106 err = crypto_shash_update(&dctx->fallback, in, space) ?:
107 crypto_shash_export(&dctx->fallback, &state);
108 if (err)
109 goto out;
110 count -= space;
111 in += space;
112 } else {
113 memcpy(state.buffer + leftover, in, count);
114 in = state.buffer;
115 count += leftover;
116 state.count &= ~(SHA1_BLOCK_SIZE - 1);
117 }
118 }
119
120 memcpy(result, &state.state, SHA1_DIGEST_SIZE);
121
122 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
123 : \
124 : "c"((unsigned long)state.count + count), \
125 "a"((unsigned long)state.count), \
126 "S"(in), "D"(result));
127
128 padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
129
130 out:
131 return err;
132 }
133
134 static int padlock_sha1_final(struct shash_desc *desc, u8 *out)
135 {
136 u8 buf[4];
137
138 return padlock_sha1_finup(desc, buf, 0, out);
139 }
140
141 static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in,
142 unsigned int count, u8 *out)
143 {
144 /* We can't store directly to *out as it may be unaligned. */
145 /* BTW Don't reduce the buffer size below 128 Bytes!
146 * PadLock microcode needs it that big. */
147 char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
148 ((aligned(STACK_ALIGN)));
149 char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
150 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
151 struct sha256_state state;
152 unsigned int space;
153 unsigned int leftover;
154 int err;
155
156 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
157 err = crypto_shash_export(&dctx->fallback, &state);
158 if (err)
159 goto out;
160
161 if (state.count + count > ULONG_MAX)
162 return crypto_shash_finup(&dctx->fallback, in, count, out);
163
164 leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
165 space = SHA256_BLOCK_SIZE - leftover;
166 if (space) {
167 if (count > space) {
168 err = crypto_shash_update(&dctx->fallback, in, space) ?:
169 crypto_shash_export(&dctx->fallback, &state);
170 if (err)
171 goto out;
172 count -= space;
173 in += space;
174 } else {
175 memcpy(state.buf + leftover, in, count);
176 in = state.buf;
177 count += leftover;
178 state.count &= ~(SHA1_BLOCK_SIZE - 1);
179 }
180 }
181
182 memcpy(result, &state.state, SHA256_DIGEST_SIZE);
183
184 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
185 : \
186 : "c"((unsigned long)state.count + count), \
187 "a"((unsigned long)state.count), \
188 "S"(in), "D"(result));
189
190 padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
191
192 out:
193 return err;
194 }
195
196 static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
197 {
198 u8 buf[4];
199
200 return padlock_sha256_finup(desc, buf, 0, out);
201 }
202
203 static int padlock_cra_init(struct crypto_tfm *tfm)
204 {
205 struct crypto_shash *hash = __crypto_shash_cast(tfm);
206 const char *fallback_driver_name = crypto_tfm_alg_name(tfm);
207 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
208 struct crypto_shash *fallback_tfm;
209 int err = -ENOMEM;
210
211 /* Allocate a fallback and abort if it failed. */
212 fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
213 CRYPTO_ALG_NEED_FALLBACK);
214 if (IS_ERR(fallback_tfm)) {
215 printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
216 fallback_driver_name);
217 err = PTR_ERR(fallback_tfm);
218 goto out;
219 }
220
221 ctx->fallback = fallback_tfm;
222 hash->descsize += crypto_shash_descsize(fallback_tfm);
223 return 0;
224
225 out:
226 return err;
227 }
228
229 static void padlock_cra_exit(struct crypto_tfm *tfm)
230 {
231 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
232
233 crypto_free_shash(ctx->fallback);
234 }
235
236 static struct shash_alg sha1_alg = {
237 .digestsize = SHA1_DIGEST_SIZE,
238 .init = padlock_sha_init,
239 .update = padlock_sha_update,
240 .finup = padlock_sha1_finup,
241 .final = padlock_sha1_final,
242 .export = padlock_sha_export,
243 .import = padlock_sha_import,
244 .descsize = sizeof(struct padlock_sha_desc),
245 .statesize = sizeof(struct sha1_state),
246 .base = {
247 .cra_name = "sha1",
248 .cra_driver_name = "sha1-padlock",
249 .cra_priority = PADLOCK_CRA_PRIORITY,
250 .cra_flags = CRYPTO_ALG_NEED_FALLBACK,
251 .cra_blocksize = SHA1_BLOCK_SIZE,
252 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
253 .cra_module = THIS_MODULE,
254 .cra_init = padlock_cra_init,
255 .cra_exit = padlock_cra_exit,
256 }
257 };
258
259 static struct shash_alg sha256_alg = {
260 .digestsize = SHA256_DIGEST_SIZE,
261 .init = padlock_sha_init,
262 .update = padlock_sha_update,
263 .finup = padlock_sha256_finup,
264 .final = padlock_sha256_final,
265 .export = padlock_sha_export,
266 .import = padlock_sha_import,
267 .descsize = sizeof(struct padlock_sha_desc),
268 .statesize = sizeof(struct sha256_state),
269 .base = {
270 .cra_name = "sha256",
271 .cra_driver_name = "sha256-padlock",
272 .cra_priority = PADLOCK_CRA_PRIORITY,
273 .cra_flags = CRYPTO_ALG_NEED_FALLBACK,
274 .cra_blocksize = SHA256_BLOCK_SIZE,
275 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
276 .cra_module = THIS_MODULE,
277 .cra_init = padlock_cra_init,
278 .cra_exit = padlock_cra_exit,
279 }
280 };
281
282 /* Add two shash_alg instance for hardware-implemented *
283 * multiple-parts hash supported by VIA Nano Processor.*/
284 static int padlock_sha1_init_nano(struct shash_desc *desc)
285 {
286 struct sha1_state *sctx = shash_desc_ctx(desc);
287
288 *sctx = (struct sha1_state){
289 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
290 };
291
292 return 0;
293 }
294
295 static int padlock_sha1_update_nano(struct shash_desc *desc,
296 const u8 *data, unsigned int len)
297 {
298 struct sha1_state *sctx = shash_desc_ctx(desc);
299 unsigned int partial, done;
300 const u8 *src;
301 /*The PHE require the out buffer must 128 bytes and 16-bytes aligned*/
302 u8 buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
303 ((aligned(STACK_ALIGN)));
304 u8 *dst = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
305
306 partial = sctx->count & 0x3f;
307 sctx->count += len;
308 done = 0;
309 src = data;
310 memcpy(dst, (u8 *)(sctx->state), SHA1_DIGEST_SIZE);
311
312 if ((partial + len) >= SHA1_BLOCK_SIZE) {
313
314 /* Append the bytes in state's buffer to a block to handle */
315 if (partial) {
316 done = -partial;
317 memcpy(sctx->buffer + partial, data,
318 done + SHA1_BLOCK_SIZE);
319 src = sctx->buffer;
320 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8"
321 : "+S"(src), "+D"(dst) \
322 : "a"((long)-1), "c"((unsigned long)1));
323 done += SHA1_BLOCK_SIZE;
324 src = data + done;
325 }
326
327 /* Process the left bytes from the input data */
328 if (len - done >= SHA1_BLOCK_SIZE) {
329 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8"
330 : "+S"(src), "+D"(dst)
331 : "a"((long)-1),
332 "c"((unsigned long)((len - done) / SHA1_BLOCK_SIZE)));
333 done += ((len - done) - (len - done) % SHA1_BLOCK_SIZE);
334 src = data + done;
335 }
336 partial = 0;
337 }
338 memcpy((u8 *)(sctx->state), dst, SHA1_DIGEST_SIZE);
339 memcpy(sctx->buffer + partial, src, len - done);
340
341 return 0;
342 }
343
344 static int padlock_sha1_final_nano(struct shash_desc *desc, u8 *out)
345 {
346 struct sha1_state *state = (struct sha1_state *)shash_desc_ctx(desc);
347 unsigned int partial, padlen;
348 __be64 bits;
349 static const u8 padding[64] = { 0x80, };
350
351 bits = cpu_to_be64(state->count << 3);
352
353 /* Pad out to 56 mod 64 */
354 partial = state->count & 0x3f;
355 padlen = (partial < 56) ? (56 - partial) : ((64+56) - partial);
356 padlock_sha1_update_nano(desc, padding, padlen);
357
358 /* Append length field bytes */
359 padlock_sha1_update_nano(desc, (const u8 *)&bits, sizeof(bits));
360
361 /* Swap to output */
362 padlock_output_block((uint32_t *)(state->state), (uint32_t *)out, 5);
363
364 return 0;
365 }
366
367 static int padlock_sha256_init_nano(struct shash_desc *desc)
368 {
369 struct sha256_state *sctx = shash_desc_ctx(desc);
370
371 *sctx = (struct sha256_state){
372 .state = { SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3, \
373 SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7},
374 };
375
376 return 0;
377 }
378
379 static int padlock_sha256_update_nano(struct shash_desc *desc, const u8 *data,
380 unsigned int len)
381 {
382 struct sha256_state *sctx = shash_desc_ctx(desc);
383 unsigned int partial, done;
384 const u8 *src;
385 /*The PHE require the out buffer must 128 bytes and 16-bytes aligned*/
386 u8 buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
387 ((aligned(STACK_ALIGN)));
388 u8 *dst = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
389
390 partial = sctx->count & 0x3f;
391 sctx->count += len;
392 done = 0;
393 src = data;
394 memcpy(dst, (u8 *)(sctx->state), SHA256_DIGEST_SIZE);
395
396 if ((partial + len) >= SHA256_BLOCK_SIZE) {
397
398 /* Append the bytes in state's buffer to a block to handle */
399 if (partial) {
400 done = -partial;
401 memcpy(sctx->buf + partial, data,
402 done + SHA256_BLOCK_SIZE);
403 src = sctx->buf;
404 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0"
405 : "+S"(src), "+D"(dst)
406 : "a"((long)-1), "c"((unsigned long)1));
407 done += SHA256_BLOCK_SIZE;
408 src = data + done;
409 }
410
411 /* Process the left bytes from input data*/
412 if (len - done >= SHA256_BLOCK_SIZE) {
413 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0"
414 : "+S"(src), "+D"(dst)
415 : "a"((long)-1),
416 "c"((unsigned long)((len - done) / 64)));
417 done += ((len - done) - (len - done) % 64);
418 src = data + done;
419 }
420 partial = 0;
421 }
422 memcpy((u8 *)(sctx->state), dst, SHA256_DIGEST_SIZE);
423 memcpy(sctx->buf + partial, src, len - done);
424
425 return 0;
426 }
427
428 static int padlock_sha256_final_nano(struct shash_desc *desc, u8 *out)
429 {
430 struct sha256_state *state =
431 (struct sha256_state *)shash_desc_ctx(desc);
432 unsigned int partial, padlen;
433 __be64 bits;
434 static const u8 padding[64] = { 0x80, };
435
436 bits = cpu_to_be64(state->count << 3);
437
438 /* Pad out to 56 mod 64 */
439 partial = state->count & 0x3f;
440 padlen = (partial < 56) ? (56 - partial) : ((64+56) - partial);
441 padlock_sha256_update_nano(desc, padding, padlen);
442
443 /* Append length field bytes */
444 padlock_sha256_update_nano(desc, (const u8 *)&bits, sizeof(bits));
445
446 /* Swap to output */
447 padlock_output_block((uint32_t *)(state->state), (uint32_t *)out, 8);
448
449 return 0;
450 }
451
452 static int padlock_sha_export_nano(struct shash_desc *desc,
453 void *out)
454 {
455 int statesize = crypto_shash_statesize(desc->tfm);
456 void *sctx = shash_desc_ctx(desc);
457
458 memcpy(out, sctx, statesize);
459 return 0;
460 }
461
462 static int padlock_sha_import_nano(struct shash_desc *desc,
463 const void *in)
464 {
465 int statesize = crypto_shash_statesize(desc->tfm);
466 void *sctx = shash_desc_ctx(desc);
467
468 memcpy(sctx, in, statesize);
469 return 0;
470 }
471
472 static struct shash_alg sha1_alg_nano = {
473 .digestsize = SHA1_DIGEST_SIZE,
474 .init = padlock_sha1_init_nano,
475 .update = padlock_sha1_update_nano,
476 .final = padlock_sha1_final_nano,
477 .export = padlock_sha_export_nano,
478 .import = padlock_sha_import_nano,
479 .descsize = sizeof(struct sha1_state),
480 .statesize = sizeof(struct sha1_state),
481 .base = {
482 .cra_name = "sha1",
483 .cra_driver_name = "sha1-padlock-nano",
484 .cra_priority = PADLOCK_CRA_PRIORITY,
485 .cra_blocksize = SHA1_BLOCK_SIZE,
486 .cra_module = THIS_MODULE,
487 }
488 };
489
490 static struct shash_alg sha256_alg_nano = {
491 .digestsize = SHA256_DIGEST_SIZE,
492 .init = padlock_sha256_init_nano,
493 .update = padlock_sha256_update_nano,
494 .final = padlock_sha256_final_nano,
495 .export = padlock_sha_export_nano,
496 .import = padlock_sha_import_nano,
497 .descsize = sizeof(struct sha256_state),
498 .statesize = sizeof(struct sha256_state),
499 .base = {
500 .cra_name = "sha256",
501 .cra_driver_name = "sha256-padlock-nano",
502 .cra_priority = PADLOCK_CRA_PRIORITY,
503 .cra_blocksize = SHA256_BLOCK_SIZE,
504 .cra_module = THIS_MODULE,
505 }
506 };
507
508 static const struct x86_cpu_id padlock_sha_ids[] = {
509 X86_FEATURE_MATCH(X86_FEATURE_PHE),
510 {}
511 };
512 MODULE_DEVICE_TABLE(x86cpu, padlock_sha_ids);
513
514 static int __init padlock_init(void)
515 {
516 int rc = -ENODEV;
517 struct cpuinfo_x86 *c = &cpu_data(0);
518 struct shash_alg *sha1;
519 struct shash_alg *sha256;
520
521 if (!x86_match_cpu(padlock_sha_ids) || !boot_cpu_has(X86_FEATURE_PHE_EN))
522 return -ENODEV;
523
524 /* Register the newly added algorithm module if on *
525 * VIA Nano processor, or else just do as before */
526 if (c->x86_model < 0x0f) {
527 sha1 = &sha1_alg;
528 sha256 = &sha256_alg;
529 } else {
530 sha1 = &sha1_alg_nano;
531 sha256 = &sha256_alg_nano;
532 }
533
534 rc = crypto_register_shash(sha1);
535 if (rc)
536 goto out;
537
538 rc = crypto_register_shash(sha256);
539 if (rc)
540 goto out_unreg1;
541
542 printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
543
544 return 0;
545
546 out_unreg1:
547 crypto_unregister_shash(sha1);
548
549 out:
550 printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
551 return rc;
552 }
553
554 static void __exit padlock_fini(void)
555 {
556 struct cpuinfo_x86 *c = &cpu_data(0);
557
558 if (c->x86_model >= 0x0f) {
559 crypto_unregister_shash(&sha1_alg_nano);
560 crypto_unregister_shash(&sha256_alg_nano);
561 } else {
562 crypto_unregister_shash(&sha1_alg);
563 crypto_unregister_shash(&sha256_alg);
564 }
565 }
566
567 module_init(padlock_init);
568 module_exit(padlock_fini);
569
570 MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
571 MODULE_LICENSE("GPL");
572 MODULE_AUTHOR("Michal Ludvig");
573
574 MODULE_ALIAS_CRYPTO("sha1-all");
575 MODULE_ALIAS_CRYPTO("sha256-all");
576 MODULE_ALIAS_CRYPTO("sha1-padlock");
577 MODULE_ALIAS_CRYPTO("sha256-padlock");
Linux with added FPC-III support