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Michal Ludvig6c833272006-07-12 12:29:38 +10001/*
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
Herbert Xu7d024602009-07-10 17:26:44 +080015#include <crypto/internal/hash.h>
Herbert Xu21493082011-01-07 14:52:00 +110016#include <crypto/padlock.h>
Jan Glauber5265eeb2007-10-09 22:43:13 +080017#include <crypto/sha.h>
Herbert Xu60104392006-08-26 18:34:10 +100018#include <linux/err.h>
Michal Ludvig6c833272006-07-12 12:29:38 +100019#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/errno.h>
Michal Ludvig6c833272006-07-12 12:29:38 +100022#include <linux/interrupt.h>
23#include <linux/kernel.h>
24#include <linux/scatterlist.h>
Andi Kleen3bd391f2012-01-26 00:09:06 +010025#include <asm/cpu_device_id.h>
Suresh Siddhae4914012008-08-13 22:02:26 +100026#include <asm/i387.h>
Herbert Xu4c6ab3e2009-09-21 23:21:53 -070027
Herbert Xubbbee462009-07-11 18:16:16 +080028struct padlock_sha_desc {
29 struct shash_desc fallback;
Michal Ludvig6c833272006-07-12 12:29:38 +100030};
31
Herbert Xubbbee462009-07-11 18:16:16 +080032struct padlock_sha_ctx {
33 struct crypto_shash *fallback;
34};
35
36static int padlock_sha_init(struct shash_desc *desc)
Michal Ludvig6c833272006-07-12 12:29:38 +100037{
Herbert Xubbbee462009-07-11 18:16:16 +080038 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);
Michal Ludvig6c833272006-07-12 12:29:38 +100044}
45
Herbert Xubbbee462009-07-11 18:16:16 +080046static int padlock_sha_update(struct shash_desc *desc,
47 const u8 *data, unsigned int length)
Michal Ludvig6c833272006-07-12 12:29:38 +100048{
Herbert Xubbbee462009-07-11 18:16:16 +080049 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
Herbert Xu7d024602009-07-10 17:26:44 +080050
Herbert Xubbbee462009-07-11 18:16:16 +080051 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
52 return crypto_shash_update(&dctx->fallback, data, length);
Michal Ludvig6c833272006-07-12 12:29:38 +100053}
54
Herbert Xua8d7ac22010-02-01 09:17:56 +110055static 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
62static 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
Michal Ludvig6c833272006-07-12 12:29:38 +100072static 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
Herbert Xubbbee462009-07-11 18:16:16 +080079static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
80 unsigned int count, u8 *out)
Michal Ludvig6c833272006-07-12 12:29:38 +100081{
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. */
Herbert Xu4c6ab3e2009-09-21 23:21:53 -070085 char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
86 ((aligned(STACK_ALIGN)));
87 char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
Herbert Xubbbee462009-07-11 18:16:16 +080088 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
89 struct sha1_state state;
90 unsigned int space;
91 unsigned int leftover;
Suresh Siddhae4914012008-08-13 22:02:26 +100092 int ts_state;
Herbert Xubbbee462009-07-11 18:16:16 +080093 int err;
Michal Ludvig6c833272006-07-12 12:29:38 +100094
Herbert Xubbbee462009-07-11 18:16:16 +080095 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
96 err = crypto_shash_export(&dctx->fallback, &state);
97 if (err)
98 goto out;
99
100 if (state.count + count > ULONG_MAX)
101 return crypto_shash_finup(&dctx->fallback, in, count, out);
102
103 leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
104 space = SHA1_BLOCK_SIZE - leftover;
105 if (space) {
106 if (count > space) {
107 err = crypto_shash_update(&dctx->fallback, in, space) ?:
108 crypto_shash_export(&dctx->fallback, &state);
109 if (err)
110 goto out;
111 count -= space;
112 in += space;
113 } else {
114 memcpy(state.buffer + leftover, in, count);
115 in = state.buffer;
116 count += leftover;
Herbert Xue9b25f12009-07-16 10:33:27 +0800117 state.count &= ~(SHA1_BLOCK_SIZE - 1);
Herbert Xubbbee462009-07-11 18:16:16 +0800118 }
119 }
120
121 memcpy(result, &state.state, SHA1_DIGEST_SIZE);
122
Suresh Siddhae4914012008-08-13 22:02:26 +1000123 /* prevent taking the spurious DNA fault with padlock. */
124 ts_state = irq_ts_save();
Michal Ludvig6c833272006-07-12 12:29:38 +1000125 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
Herbert Xubbbee462009-07-11 18:16:16 +0800126 : \
Herbert Xufaae8902009-07-15 18:37:48 +0800127 : "c"((unsigned long)state.count + count), \
128 "a"((unsigned long)state.count), \
Herbert Xubbbee462009-07-11 18:16:16 +0800129 "S"(in), "D"(result));
Suresh Siddhae4914012008-08-13 22:02:26 +1000130 irq_ts_restore(ts_state);
Michal Ludvig6c833272006-07-12 12:29:38 +1000131
132 padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
Herbert Xubbbee462009-07-11 18:16:16 +0800133
134out:
135 return err;
Michal Ludvig6c833272006-07-12 12:29:38 +1000136}
137
Herbert Xubbbee462009-07-11 18:16:16 +0800138static int padlock_sha1_final(struct shash_desc *desc, u8 *out)
139{
140 u8 buf[4];
141
142 return padlock_sha1_finup(desc, buf, 0, out);
143}
144
145static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in,
146 unsigned int count, u8 *out)
Michal Ludvig6c833272006-07-12 12:29:38 +1000147{
148 /* We can't store directly to *out as it may be unaligned. */
149 /* BTW Don't reduce the buffer size below 128 Bytes!
150 * PadLock microcode needs it that big. */
Herbert Xu4c6ab3e2009-09-21 23:21:53 -0700151 char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
152 ((aligned(STACK_ALIGN)));
153 char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
Herbert Xubbbee462009-07-11 18:16:16 +0800154 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
155 struct sha256_state state;
156 unsigned int space;
157 unsigned int leftover;
Suresh Siddhae4914012008-08-13 22:02:26 +1000158 int ts_state;
Herbert Xubbbee462009-07-11 18:16:16 +0800159 int err;
Michal Ludvig6c833272006-07-12 12:29:38 +1000160
Herbert Xubbbee462009-07-11 18:16:16 +0800161 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
162 err = crypto_shash_export(&dctx->fallback, &state);
163 if (err)
164 goto out;
165
166 if (state.count + count > ULONG_MAX)
167 return crypto_shash_finup(&dctx->fallback, in, count, out);
168
169 leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
170 space = SHA256_BLOCK_SIZE - leftover;
171 if (space) {
172 if (count > space) {
173 err = crypto_shash_update(&dctx->fallback, in, space) ?:
174 crypto_shash_export(&dctx->fallback, &state);
175 if (err)
176 goto out;
177 count -= space;
178 in += space;
179 } else {
180 memcpy(state.buf + leftover, in, count);
181 in = state.buf;
182 count += leftover;
Herbert Xue9b25f12009-07-16 10:33:27 +0800183 state.count &= ~(SHA1_BLOCK_SIZE - 1);
Herbert Xubbbee462009-07-11 18:16:16 +0800184 }
185 }
186
187 memcpy(result, &state.state, SHA256_DIGEST_SIZE);
Michal Ludvig6c833272006-07-12 12:29:38 +1000188
Suresh Siddhae4914012008-08-13 22:02:26 +1000189 /* prevent taking the spurious DNA fault with padlock. */
190 ts_state = irq_ts_save();
Michal Ludvig6c833272006-07-12 12:29:38 +1000191 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
Herbert Xubbbee462009-07-11 18:16:16 +0800192 : \
Herbert Xufaae8902009-07-15 18:37:48 +0800193 : "c"((unsigned long)state.count + count), \
194 "a"((unsigned long)state.count), \
Herbert Xubbbee462009-07-11 18:16:16 +0800195 "S"(in), "D"(result));
Suresh Siddhae4914012008-08-13 22:02:26 +1000196 irq_ts_restore(ts_state);
Michal Ludvig6c833272006-07-12 12:29:38 +1000197
198 padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
Herbert Xubbbee462009-07-11 18:16:16 +0800199
200out:
201 return err;
Michal Ludvig6c833272006-07-12 12:29:38 +1000202}
203
Herbert Xubbbee462009-07-11 18:16:16 +0800204static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
Michal Ludvig6c833272006-07-12 12:29:38 +1000205{
Herbert Xubbbee462009-07-11 18:16:16 +0800206 u8 buf[4];
Herbert Xu7d024602009-07-10 17:26:44 +0800207
Herbert Xubbbee462009-07-11 18:16:16 +0800208 return padlock_sha256_finup(desc, buf, 0, out);
Michal Ludvig6c833272006-07-12 12:29:38 +1000209}
210
Herbert Xu60104392006-08-26 18:34:10 +1000211static int padlock_cra_init(struct crypto_tfm *tfm)
Michal Ludvig6c833272006-07-12 12:29:38 +1000212{
Herbert Xubbbee462009-07-11 18:16:16 +0800213 struct crypto_shash *hash = __crypto_shash_cast(tfm);
Marek Vasut1f4fe5a2014-05-14 11:41:02 +0200214 const char *fallback_driver_name = crypto_tfm_alg_name(tfm);
Herbert Xubbbee462009-07-11 18:16:16 +0800215 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
Herbert Xu7d024602009-07-10 17:26:44 +0800216 struct crypto_shash *fallback_tfm;
217 int err = -ENOMEM;
Herbert Xu60104392006-08-26 18:34:10 +1000218
Michal Ludvig6c833272006-07-12 12:29:38 +1000219 /* Allocate a fallback and abort if it failed. */
Herbert Xu7d024602009-07-10 17:26:44 +0800220 fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
221 CRYPTO_ALG_NEED_FALLBACK);
Herbert Xu60104392006-08-26 18:34:10 +1000222 if (IS_ERR(fallback_tfm)) {
Michal Ludvig6c833272006-07-12 12:29:38 +1000223 printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
224 fallback_driver_name);
Herbert Xu7d024602009-07-10 17:26:44 +0800225 err = PTR_ERR(fallback_tfm);
Herbert Xubbbee462009-07-11 18:16:16 +0800226 goto out;
Michal Ludvig6c833272006-07-12 12:29:38 +1000227 }
228
Herbert Xubbbee462009-07-11 18:16:16 +0800229 ctx->fallback = fallback_tfm;
230 hash->descsize += crypto_shash_descsize(fallback_tfm);
Michal Ludvig6c833272006-07-12 12:29:38 +1000231 return 0;
Herbert Xu7d024602009-07-10 17:26:44 +0800232
Herbert Xu7d024602009-07-10 17:26:44 +0800233out:
234 return err;
Michal Ludvig6c833272006-07-12 12:29:38 +1000235}
236
Michal Ludvig6c833272006-07-12 12:29:38 +1000237static void padlock_cra_exit(struct crypto_tfm *tfm)
238{
Herbert Xubbbee462009-07-11 18:16:16 +0800239 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
Michal Ludvig6c833272006-07-12 12:29:38 +1000240
Herbert Xubbbee462009-07-11 18:16:16 +0800241 crypto_free_shash(ctx->fallback);
Michal Ludvig6c833272006-07-12 12:29:38 +1000242}
243
Herbert Xubbbee462009-07-11 18:16:16 +0800244static struct shash_alg sha1_alg = {
245 .digestsize = SHA1_DIGEST_SIZE,
246 .init = padlock_sha_init,
247 .update = padlock_sha_update,
248 .finup = padlock_sha1_finup,
249 .final = padlock_sha1_final,
Herbert Xua8d7ac22010-02-01 09:17:56 +1100250 .export = padlock_sha_export,
251 .import = padlock_sha_import,
Herbert Xubbbee462009-07-11 18:16:16 +0800252 .descsize = sizeof(struct padlock_sha_desc),
Herbert Xua8d7ac22010-02-01 09:17:56 +1100253 .statesize = sizeof(struct sha1_state),
Herbert Xubbbee462009-07-11 18:16:16 +0800254 .base = {
255 .cra_name = "sha1",
256 .cra_driver_name = "sha1-padlock",
257 .cra_priority = PADLOCK_CRA_PRIORITY,
258 .cra_flags = CRYPTO_ALG_TYPE_SHASH |
259 CRYPTO_ALG_NEED_FALLBACK,
260 .cra_blocksize = SHA1_BLOCK_SIZE,
261 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
262 .cra_module = THIS_MODULE,
263 .cra_init = padlock_cra_init,
264 .cra_exit = padlock_cra_exit,
Michal Ludvig6c833272006-07-12 12:29:38 +1000265 }
266};
267
Herbert Xubbbee462009-07-11 18:16:16 +0800268static struct shash_alg sha256_alg = {
269 .digestsize = SHA256_DIGEST_SIZE,
270 .init = padlock_sha_init,
271 .update = padlock_sha_update,
272 .finup = padlock_sha256_finup,
273 .final = padlock_sha256_final,
Herbert Xua8d7ac22010-02-01 09:17:56 +1100274 .export = padlock_sha_export,
275 .import = padlock_sha_import,
Herbert Xubbbee462009-07-11 18:16:16 +0800276 .descsize = sizeof(struct padlock_sha_desc),
Herbert Xua8d7ac22010-02-01 09:17:56 +1100277 .statesize = sizeof(struct sha256_state),
Herbert Xubbbee462009-07-11 18:16:16 +0800278 .base = {
279 .cra_name = "sha256",
280 .cra_driver_name = "sha256-padlock",
281 .cra_priority = PADLOCK_CRA_PRIORITY,
282 .cra_flags = CRYPTO_ALG_TYPE_SHASH |
283 CRYPTO_ALG_NEED_FALLBACK,
284 .cra_blocksize = SHA256_BLOCK_SIZE,
285 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
286 .cra_module = THIS_MODULE,
287 .cra_init = padlock_cra_init,
288 .cra_exit = padlock_cra_exit,
Michal Ludvig6c833272006-07-12 12:29:38 +1000289 }
290};
291
Brilly Wu0475add2011-03-27 10:45:00 +0800292/* Add two shash_alg instance for hardware-implemented *
293* multiple-parts hash supported by VIA Nano Processor.*/
294static int padlock_sha1_init_nano(struct shash_desc *desc)
295{
296 struct sha1_state *sctx = shash_desc_ctx(desc);
297
298 *sctx = (struct sha1_state){
299 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
300 };
301
302 return 0;
303}
304
305static int padlock_sha1_update_nano(struct shash_desc *desc,
306 const u8 *data, unsigned int len)
307{
308 struct sha1_state *sctx = shash_desc_ctx(desc);
309 unsigned int partial, done;
310 const u8 *src;
311 /*The PHE require the out buffer must 128 bytes and 16-bytes aligned*/
312 u8 buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
313 ((aligned(STACK_ALIGN)));
314 u8 *dst = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
315 int ts_state;
316
317 partial = sctx->count & 0x3f;
318 sctx->count += len;
319 done = 0;
320 src = data;
321 memcpy(dst, (u8 *)(sctx->state), SHA1_DIGEST_SIZE);
322
323 if ((partial + len) >= SHA1_BLOCK_SIZE) {
324
325 /* Append the bytes in state's buffer to a block to handle */
326 if (partial) {
327 done = -partial;
328 memcpy(sctx->buffer + partial, data,
329 done + SHA1_BLOCK_SIZE);
330 src = sctx->buffer;
331 ts_state = irq_ts_save();
332 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8"
333 : "+S"(src), "+D"(dst) \
334 : "a"((long)-1), "c"((unsigned long)1));
335 irq_ts_restore(ts_state);
336 done += SHA1_BLOCK_SIZE;
337 src = data + done;
338 }
339
340 /* Process the left bytes from the input data */
341 if (len - done >= SHA1_BLOCK_SIZE) {
342 ts_state = irq_ts_save();
343 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8"
344 : "+S"(src), "+D"(dst)
345 : "a"((long)-1),
346 "c"((unsigned long)((len - done) / SHA1_BLOCK_SIZE)));
347 irq_ts_restore(ts_state);
348 done += ((len - done) - (len - done) % SHA1_BLOCK_SIZE);
349 src = data + done;
350 }
351 partial = 0;
352 }
353 memcpy((u8 *)(sctx->state), dst, SHA1_DIGEST_SIZE);
354 memcpy(sctx->buffer + partial, src, len - done);
355
356 return 0;
357}
358
359static int padlock_sha1_final_nano(struct shash_desc *desc, u8 *out)
360{
361 struct sha1_state *state = (struct sha1_state *)shash_desc_ctx(desc);
362 unsigned int partial, padlen;
363 __be64 bits;
364 static const u8 padding[64] = { 0x80, };
365
366 bits = cpu_to_be64(state->count << 3);
367
368 /* Pad out to 56 mod 64 */
369 partial = state->count & 0x3f;
370 padlen = (partial < 56) ? (56 - partial) : ((64+56) - partial);
371 padlock_sha1_update_nano(desc, padding, padlen);
372
373 /* Append length field bytes */
374 padlock_sha1_update_nano(desc, (const u8 *)&bits, sizeof(bits));
375
376 /* Swap to output */
377 padlock_output_block((uint32_t *)(state->state), (uint32_t *)out, 5);
378
379 return 0;
380}
381
382static int padlock_sha256_init_nano(struct shash_desc *desc)
383{
384 struct sha256_state *sctx = shash_desc_ctx(desc);
385
386 *sctx = (struct sha256_state){
387 .state = { SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3, \
388 SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7},
389 };
390
391 return 0;
392}
393
394static int padlock_sha256_update_nano(struct shash_desc *desc, const u8 *data,
395 unsigned int len)
396{
397 struct sha256_state *sctx = shash_desc_ctx(desc);
398 unsigned int partial, done;
399 const u8 *src;
400 /*The PHE require the out buffer must 128 bytes and 16-bytes aligned*/
401 u8 buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
402 ((aligned(STACK_ALIGN)));
403 u8 *dst = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
404 int ts_state;
405
406 partial = sctx->count & 0x3f;
407 sctx->count += len;
408 done = 0;
409 src = data;
410 memcpy(dst, (u8 *)(sctx->state), SHA256_DIGEST_SIZE);
411
412 if ((partial + len) >= SHA256_BLOCK_SIZE) {
413
414 /* Append the bytes in state's buffer to a block to handle */
415 if (partial) {
416 done = -partial;
417 memcpy(sctx->buf + partial, data,
418 done + SHA256_BLOCK_SIZE);
419 src = sctx->buf;
420 ts_state = irq_ts_save();
421 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0"
422 : "+S"(src), "+D"(dst)
423 : "a"((long)-1), "c"((unsigned long)1));
424 irq_ts_restore(ts_state);
425 done += SHA256_BLOCK_SIZE;
426 src = data + done;
427 }
428
429 /* Process the left bytes from input data*/
430 if (len - done >= SHA256_BLOCK_SIZE) {
431 ts_state = irq_ts_save();
432 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0"
433 : "+S"(src), "+D"(dst)
434 : "a"((long)-1),
435 "c"((unsigned long)((len - done) / 64)));
436 irq_ts_restore(ts_state);
437 done += ((len - done) - (len - done) % 64);
438 src = data + done;
439 }
440 partial = 0;
441 }
442 memcpy((u8 *)(sctx->state), dst, SHA256_DIGEST_SIZE);
443 memcpy(sctx->buf + partial, src, len - done);
444
445 return 0;
446}
447
448static int padlock_sha256_final_nano(struct shash_desc *desc, u8 *out)
449{
450 struct sha256_state *state =
451 (struct sha256_state *)shash_desc_ctx(desc);
452 unsigned int partial, padlen;
453 __be64 bits;
454 static const u8 padding[64] = { 0x80, };
455
456 bits = cpu_to_be64(state->count << 3);
457
458 /* Pad out to 56 mod 64 */
459 partial = state->count & 0x3f;
460 padlen = (partial < 56) ? (56 - partial) : ((64+56) - partial);
461 padlock_sha256_update_nano(desc, padding, padlen);
462
463 /* Append length field bytes */
464 padlock_sha256_update_nano(desc, (const u8 *)&bits, sizeof(bits));
465
466 /* Swap to output */
467 padlock_output_block((uint32_t *)(state->state), (uint32_t *)out, 8);
468
469 return 0;
470}
471
472static int padlock_sha_export_nano(struct shash_desc *desc,
473 void *out)
474{
475 int statesize = crypto_shash_statesize(desc->tfm);
476 void *sctx = shash_desc_ctx(desc);
477
478 memcpy(out, sctx, statesize);
479 return 0;
480}
481
482static int padlock_sha_import_nano(struct shash_desc *desc,
483 const void *in)
484{
485 int statesize = crypto_shash_statesize(desc->tfm);
486 void *sctx = shash_desc_ctx(desc);
487
488 memcpy(sctx, in, statesize);
489 return 0;
490}
491
492static struct shash_alg sha1_alg_nano = {
493 .digestsize = SHA1_DIGEST_SIZE,
494 .init = padlock_sha1_init_nano,
495 .update = padlock_sha1_update_nano,
496 .final = padlock_sha1_final_nano,
497 .export = padlock_sha_export_nano,
498 .import = padlock_sha_import_nano,
499 .descsize = sizeof(struct sha1_state),
500 .statesize = sizeof(struct sha1_state),
501 .base = {
502 .cra_name = "sha1",
503 .cra_driver_name = "sha1-padlock-nano",
504 .cra_priority = PADLOCK_CRA_PRIORITY,
505 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
506 .cra_blocksize = SHA1_BLOCK_SIZE,
507 .cra_module = THIS_MODULE,
508 }
509};
510
511static struct shash_alg sha256_alg_nano = {
512 .digestsize = SHA256_DIGEST_SIZE,
513 .init = padlock_sha256_init_nano,
514 .update = padlock_sha256_update_nano,
515 .final = padlock_sha256_final_nano,
516 .export = padlock_sha_export_nano,
517 .import = padlock_sha_import_nano,
518 .descsize = sizeof(struct sha256_state),
519 .statesize = sizeof(struct sha256_state),
520 .base = {
521 .cra_name = "sha256",
522 .cra_driver_name = "sha256-padlock-nano",
523 .cra_priority = PADLOCK_CRA_PRIORITY,
524 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
525 .cra_blocksize = SHA256_BLOCK_SIZE,
526 .cra_module = THIS_MODULE,
527 }
528};
529
Andi Kleen3bd391f2012-01-26 00:09:06 +0100530static struct x86_cpu_id padlock_sha_ids[] = {
531 X86_FEATURE_MATCH(X86_FEATURE_PHE),
532 {}
533};
534MODULE_DEVICE_TABLE(x86cpu, padlock_sha_ids);
535
Michal Ludvig6c833272006-07-12 12:29:38 +1000536static int __init padlock_init(void)
537{
538 int rc = -ENODEV;
Brilly Wu0475add2011-03-27 10:45:00 +0800539 struct cpuinfo_x86 *c = &cpu_data(0);
540 struct shash_alg *sha1;
541 struct shash_alg *sha256;
Michal Ludvig6c833272006-07-12 12:29:38 +1000542
Andi Kleen3bd391f2012-01-26 00:09:06 +0100543 if (!x86_match_cpu(padlock_sha_ids) || !cpu_has_phe_enabled)
Michal Ludvig6c833272006-07-12 12:29:38 +1000544 return -ENODEV;
Michal Ludvig6c833272006-07-12 12:29:38 +1000545
Brilly Wu0475add2011-03-27 10:45:00 +0800546 /* Register the newly added algorithm module if on *
547 * VIA Nano processor, or else just do as before */
548 if (c->x86_model < 0x0f) {
549 sha1 = &sha1_alg;
550 sha256 = &sha256_alg;
551 } else {
552 sha1 = &sha1_alg_nano;
553 sha256 = &sha256_alg_nano;
554 }
555
556 rc = crypto_register_shash(sha1);
Michal Ludvig6c833272006-07-12 12:29:38 +1000557 if (rc)
558 goto out;
559
Brilly Wu0475add2011-03-27 10:45:00 +0800560 rc = crypto_register_shash(sha256);
Michal Ludvig6c833272006-07-12 12:29:38 +1000561 if (rc)
562 goto out_unreg1;
563
564 printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
565
566 return 0;
567
568out_unreg1:
Brilly Wu0475add2011-03-27 10:45:00 +0800569 crypto_unregister_shash(sha1);
570
Michal Ludvig6c833272006-07-12 12:29:38 +1000571out:
572 printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
573 return rc;
574}
575
576static void __exit padlock_fini(void)
577{
Brilly Wu0475add2011-03-27 10:45:00 +0800578 struct cpuinfo_x86 *c = &cpu_data(0);
579
580 if (c->x86_model >= 0x0f) {
581 crypto_unregister_shash(&sha1_alg_nano);
582 crypto_unregister_shash(&sha256_alg_nano);
583 } else {
584 crypto_unregister_shash(&sha1_alg);
585 crypto_unregister_shash(&sha256_alg);
586 }
Michal Ludvig6c833272006-07-12 12:29:38 +1000587}
588
589module_init(padlock_init);
590module_exit(padlock_fini);
591
592MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
593MODULE_LICENSE("GPL");
594MODULE_AUTHOR("Michal Ludvig");
595
Herbert Xua760a662009-02-26 14:06:31 +0800596MODULE_ALIAS("sha1-all");
597MODULE_ALIAS("sha256-all");
Michal Ludvig6c833272006-07-12 12:29:38 +1000598MODULE_ALIAS("sha1-padlock");
599MODULE_ALIAS("sha256-padlock");