Commit | Line | Data |
---|---|---|
6c833275 ML |
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 | ||
7d024608 | 15 | #include <crypto/internal/hash.h> |
21493088 | 16 | #include <crypto/padlock.h> |
5265eeb2 | 17 | #include <crypto/sha.h> |
6010439f | 18 | #include <linux/err.h> |
6c833275 ML |
19 | #include <linux/module.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/errno.h> | |
6c833275 ML |
22 | #include <linux/interrupt.h> |
23 | #include <linux/kernel.h> | |
24 | #include <linux/scatterlist.h> | |
e4914012 | 25 | #include <asm/i387.h> |
4c6ab3ee | 26 | |
bbbee467 HX |
27 | struct padlock_sha_desc { |
28 | struct shash_desc fallback; | |
6c833275 ML |
29 | }; |
30 | ||
bbbee467 HX |
31 | struct padlock_sha_ctx { |
32 | struct crypto_shash *fallback; | |
33 | }; | |
6c833275 | 34 | |
bbbee467 | 35 | static int padlock_sha_init(struct shash_desc *desc) |
6c833275 | 36 | { |
bbbee467 HX |
37 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); |
38 | struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm); | |
6c833275 | 39 | |
bbbee467 HX |
40 | dctx->fallback.tfm = ctx->fallback; |
41 | dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; | |
42 | return crypto_shash_init(&dctx->fallback); | |
6c833275 ML |
43 | } |
44 | ||
bbbee467 HX |
45 | static int padlock_sha_update(struct shash_desc *desc, |
46 | const u8 *data, unsigned int length) | |
6c833275 | 47 | { |
bbbee467 | 48 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); |
6c833275 | 49 | |
bbbee467 HX |
50 | dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
51 | return crypto_shash_update(&dctx->fallback, data, length); | |
6c833275 ML |
52 | } |
53 | ||
a8d7ac27 HX |
54 | static int padlock_sha_export(struct shash_desc *desc, void *out) |
55 | { | |
56 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); | |
57 | ||
58 | return crypto_shash_export(&dctx->fallback, out); | |
59 | } | |
60 | ||
61 | static int padlock_sha_import(struct shash_desc *desc, const void *in) | |
62 | { | |
63 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); | |
64 | struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm); | |
65 | ||
66 | dctx->fallback.tfm = ctx->fallback; | |
67 | dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; | |
68 | return crypto_shash_import(&dctx->fallback, in); | |
69 | } | |
70 | ||
6c833275 ML |
71 | static inline void padlock_output_block(uint32_t *src, |
72 | uint32_t *dst, size_t count) | |
73 | { | |
74 | while (count--) | |
75 | *dst++ = swab32(*src++); | |
76 | } | |
77 | ||
bbbee467 HX |
78 | static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in, |
79 | unsigned int count, u8 *out) | |
6c833275 ML |
80 | { |
81 | /* We can't store directly to *out as it may be unaligned. */ | |
82 | /* BTW Don't reduce the buffer size below 128 Bytes! | |
83 | * PadLock microcode needs it that big. */ | |
4c6ab3ee HX |
84 | char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__ |
85 | ((aligned(STACK_ALIGN))); | |
86 | char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT); | |
bbbee467 HX |
87 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); |
88 | struct sha1_state state; | |
89 | unsigned int space; | |
90 | unsigned int leftover; | |
e4914012 | 91 | int ts_state; |
bbbee467 HX |
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; | |
e9b25f16 | 116 | state.count &= ~(SHA1_BLOCK_SIZE - 1); |
bbbee467 HX |
117 | } |
118 | } | |
119 | ||
120 | memcpy(result, &state.state, SHA1_DIGEST_SIZE); | |
6c833275 | 121 | |
e4914012 SS |
122 | /* prevent taking the spurious DNA fault with padlock. */ |
123 | ts_state = irq_ts_save(); | |
6c833275 | 124 | asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */ |
bbbee467 | 125 | : \ |
faae8908 HX |
126 | : "c"((unsigned long)state.count + count), \ |
127 | "a"((unsigned long)state.count), \ | |
bbbee467 | 128 | "S"(in), "D"(result)); |
e4914012 | 129 | irq_ts_restore(ts_state); |
6c833275 ML |
130 | |
131 | padlock_output_block((uint32_t *)result, (uint32_t *)out, 5); | |
bbbee467 HX |
132 | |
133 | out: | |
134 | return err; | |
6c833275 ML |
135 | } |
136 | ||
bbbee467 HX |
137 | static int padlock_sha1_final(struct shash_desc *desc, u8 *out) |
138 | { | |
139 | u8 buf[4]; | |
140 | ||
141 | return padlock_sha1_finup(desc, buf, 0, out); | |
142 | } | |
143 | ||
144 | static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in, | |
145 | unsigned int count, u8 *out) | |
6c833275 ML |
146 | { |
147 | /* We can't store directly to *out as it may be unaligned. */ | |
148 | /* BTW Don't reduce the buffer size below 128 Bytes! | |
149 | * PadLock microcode needs it that big. */ | |
4c6ab3ee HX |
150 | char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__ |
151 | ((aligned(STACK_ALIGN))); | |
152 | char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT); | |
bbbee467 HX |
153 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); |
154 | struct sha256_state state; | |
155 | unsigned int space; | |
156 | unsigned int leftover; | |
e4914012 | 157 | int ts_state; |
bbbee467 | 158 | int err; |
6c833275 | 159 | |
bbbee467 HX |
160 | dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
161 | err = crypto_shash_export(&dctx->fallback, &state); | |
162 | if (err) | |
163 | goto out; | |
164 | ||
165 | if (state.count + count > ULONG_MAX) | |
166 | return crypto_shash_finup(&dctx->fallback, in, count, out); | |
167 | ||
168 | leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1; | |
169 | space = SHA256_BLOCK_SIZE - leftover; | |
170 | if (space) { | |
171 | if (count > space) { | |
172 | err = crypto_shash_update(&dctx->fallback, in, space) ?: | |
173 | crypto_shash_export(&dctx->fallback, &state); | |
174 | if (err) | |
175 | goto out; | |
176 | count -= space; | |
177 | in += space; | |
178 | } else { | |
179 | memcpy(state.buf + leftover, in, count); | |
180 | in = state.buf; | |
181 | count += leftover; | |
e9b25f16 | 182 | state.count &= ~(SHA1_BLOCK_SIZE - 1); |
bbbee467 HX |
183 | } |
184 | } | |
185 | ||
186 | memcpy(result, &state.state, SHA256_DIGEST_SIZE); | |
6c833275 | 187 | |
e4914012 SS |
188 | /* prevent taking the spurious DNA fault with padlock. */ |
189 | ts_state = irq_ts_save(); | |
6c833275 | 190 | asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */ |
bbbee467 | 191 | : \ |
faae8908 HX |
192 | : "c"((unsigned long)state.count + count), \ |
193 | "a"((unsigned long)state.count), \ | |
bbbee467 | 194 | "S"(in), "D"(result)); |
e4914012 | 195 | irq_ts_restore(ts_state); |
6c833275 ML |
196 | |
197 | padlock_output_block((uint32_t *)result, (uint32_t *)out, 8); | |
bbbee467 HX |
198 | |
199 | out: | |
200 | return err; | |
6c833275 ML |
201 | } |
202 | ||
bbbee467 | 203 | static int padlock_sha256_final(struct shash_desc *desc, u8 *out) |
6c833275 | 204 | { |
bbbee467 | 205 | u8 buf[4]; |
6c833275 | 206 | |
bbbee467 | 207 | return padlock_sha256_finup(desc, buf, 0, out); |
6c833275 ML |
208 | } |
209 | ||
6010439f | 210 | static int padlock_cra_init(struct crypto_tfm *tfm) |
6c833275 | 211 | { |
bbbee467 | 212 | struct crypto_shash *hash = __crypto_shash_cast(tfm); |
6010439f | 213 | const char *fallback_driver_name = tfm->__crt_alg->cra_name; |
bbbee467 | 214 | struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm); |
7d024608 HX |
215 | struct crypto_shash *fallback_tfm; |
216 | int err = -ENOMEM; | |
6010439f | 217 | |
6c833275 | 218 | /* Allocate a fallback and abort if it failed. */ |
7d024608 HX |
219 | fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0, |
220 | CRYPTO_ALG_NEED_FALLBACK); | |
6010439f | 221 | if (IS_ERR(fallback_tfm)) { |
6c833275 ML |
222 | printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n", |
223 | fallback_driver_name); | |
7d024608 | 224 | err = PTR_ERR(fallback_tfm); |
bbbee467 | 225 | goto out; |
6c833275 ML |
226 | } |
227 | ||
bbbee467 HX |
228 | ctx->fallback = fallback_tfm; |
229 | hash->descsize += crypto_shash_descsize(fallback_tfm); | |
6c833275 | 230 | return 0; |
7d024608 | 231 | |
7d024608 HX |
232 | out: |
233 | return err; | |
6c833275 ML |
234 | } |
235 | ||
6c833275 ML |
236 | static void padlock_cra_exit(struct crypto_tfm *tfm) |
237 | { | |
bbbee467 | 238 | struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm); |
7d024608 | 239 | |
bbbee467 | 240 | crypto_free_shash(ctx->fallback); |
6c833275 ML |
241 | } |
242 | ||
bbbee467 HX |
243 | static struct shash_alg sha1_alg = { |
244 | .digestsize = SHA1_DIGEST_SIZE, | |
245 | .init = padlock_sha_init, | |
246 | .update = padlock_sha_update, | |
247 | .finup = padlock_sha1_finup, | |
248 | .final = padlock_sha1_final, | |
a8d7ac27 HX |
249 | .export = padlock_sha_export, |
250 | .import = padlock_sha_import, | |
bbbee467 | 251 | .descsize = sizeof(struct padlock_sha_desc), |
a8d7ac27 | 252 | .statesize = sizeof(struct sha1_state), |
bbbee467 HX |
253 | .base = { |
254 | .cra_name = "sha1", | |
255 | .cra_driver_name = "sha1-padlock", | |
256 | .cra_priority = PADLOCK_CRA_PRIORITY, | |
257 | .cra_flags = CRYPTO_ALG_TYPE_SHASH | | |
258 | CRYPTO_ALG_NEED_FALLBACK, | |
259 | .cra_blocksize = SHA1_BLOCK_SIZE, | |
260 | .cra_ctxsize = sizeof(struct padlock_sha_ctx), | |
261 | .cra_module = THIS_MODULE, | |
262 | .cra_init = padlock_cra_init, | |
263 | .cra_exit = padlock_cra_exit, | |
6c833275 ML |
264 | } |
265 | }; | |
266 | ||
bbbee467 HX |
267 | static struct shash_alg sha256_alg = { |
268 | .digestsize = SHA256_DIGEST_SIZE, | |
269 | .init = padlock_sha_init, | |
270 | .update = padlock_sha_update, | |
271 | .finup = padlock_sha256_finup, | |
272 | .final = padlock_sha256_final, | |
a8d7ac27 HX |
273 | .export = padlock_sha_export, |
274 | .import = padlock_sha_import, | |
bbbee467 | 275 | .descsize = sizeof(struct padlock_sha_desc), |
a8d7ac27 | 276 | .statesize = sizeof(struct sha256_state), |
bbbee467 HX |
277 | .base = { |
278 | .cra_name = "sha256", | |
279 | .cra_driver_name = "sha256-padlock", | |
280 | .cra_priority = PADLOCK_CRA_PRIORITY, | |
281 | .cra_flags = CRYPTO_ALG_TYPE_SHASH | | |
282 | CRYPTO_ALG_NEED_FALLBACK, | |
283 | .cra_blocksize = SHA256_BLOCK_SIZE, | |
284 | .cra_ctxsize = sizeof(struct padlock_sha_ctx), | |
285 | .cra_module = THIS_MODULE, | |
286 | .cra_init = padlock_cra_init, | |
287 | .cra_exit = padlock_cra_exit, | |
6c833275 ML |
288 | } |
289 | }; | |
290 | ||
6c833275 ML |
291 | static int __init padlock_init(void) |
292 | { | |
293 | int rc = -ENODEV; | |
294 | ||
295 | if (!cpu_has_phe) { | |
b43e726b | 296 | printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n"); |
6c833275 ML |
297 | return -ENODEV; |
298 | } | |
299 | ||
300 | if (!cpu_has_phe_enabled) { | |
b43e726b | 301 | printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n"); |
6c833275 ML |
302 | return -ENODEV; |
303 | } | |
304 | ||
bbbee467 | 305 | rc = crypto_register_shash(&sha1_alg); |
6c833275 ML |
306 | if (rc) |
307 | goto out; | |
308 | ||
bbbee467 | 309 | rc = crypto_register_shash(&sha256_alg); |
6c833275 ML |
310 | if (rc) |
311 | goto out_unreg1; | |
312 | ||
313 | printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n"); | |
314 | ||
315 | return 0; | |
316 | ||
317 | out_unreg1: | |
bbbee467 | 318 | crypto_unregister_shash(&sha1_alg); |
6c833275 ML |
319 | out: |
320 | printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n"); | |
321 | return rc; | |
322 | } | |
323 | ||
324 | static void __exit padlock_fini(void) | |
325 | { | |
bbbee467 HX |
326 | crypto_unregister_shash(&sha1_alg); |
327 | crypto_unregister_shash(&sha256_alg); | |
6c833275 ML |
328 | } |
329 | ||
330 | module_init(padlock_init); | |
331 | module_exit(padlock_fini); | |
332 | ||
333 | MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support."); | |
334 | MODULE_LICENSE("GPL"); | |
335 | MODULE_AUTHOR("Michal Ludvig"); | |
336 | ||
a760a665 HX |
337 | MODULE_ALIAS("sha1-all"); |
338 | MODULE_ALIAS("sha256-all"); | |
6c833275 ML |
339 | MODULE_ALIAS("sha1-padlock"); |
340 | MODULE_ALIAS("sha256-padlock"); |