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Commit | Line | Data |
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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> |
5265eeb2 | 16 | #include <crypto/sha.h> |
6010439f | 17 | #include <linux/err.h> |
6c833275 ML |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/errno.h> | |
6c833275 ML |
21 | #include <linux/interrupt.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/scatterlist.h> | |
e4914012 | 24 | #include <asm/i387.h> |
6c833275 ML |
25 | #include "padlock.h" |
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 | ||
54 | static inline void padlock_output_block(uint32_t *src, | |
55 | uint32_t *dst, size_t count) | |
56 | { | |
57 | while (count--) | |
58 | *dst++ = swab32(*src++); | |
59 | } | |
60 | ||
bbbee467 HX |
61 | static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in, |
62 | unsigned int count, u8 *out) | |
6c833275 ML |
63 | { |
64 | /* We can't store directly to *out as it may be unaligned. */ | |
65 | /* BTW Don't reduce the buffer size below 128 Bytes! | |
66 | * PadLock microcode needs it that big. */ | |
bbbee467 HX |
67 | char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT))); |
68 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); | |
69 | struct sha1_state state; | |
70 | unsigned int space; | |
71 | unsigned int leftover; | |
e4914012 | 72 | int ts_state; |
bbbee467 HX |
73 | int err; |
74 | ||
75 | dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; | |
76 | err = crypto_shash_export(&dctx->fallback, &state); | |
77 | if (err) | |
78 | goto out; | |
79 | ||
80 | if (state.count + count > ULONG_MAX) | |
81 | return crypto_shash_finup(&dctx->fallback, in, count, out); | |
82 | ||
83 | leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1; | |
84 | space = SHA1_BLOCK_SIZE - leftover; | |
85 | if (space) { | |
86 | if (count > space) { | |
87 | err = crypto_shash_update(&dctx->fallback, in, space) ?: | |
88 | crypto_shash_export(&dctx->fallback, &state); | |
89 | if (err) | |
90 | goto out; | |
91 | count -= space; | |
92 | in += space; | |
93 | } else { | |
94 | memcpy(state.buffer + leftover, in, count); | |
95 | in = state.buffer; | |
96 | count += leftover; | |
97 | } | |
98 | } | |
99 | ||
100 | memcpy(result, &state.state, SHA1_DIGEST_SIZE); | |
6c833275 | 101 | |
e4914012 SS |
102 | /* prevent taking the spurious DNA fault with padlock. */ |
103 | ts_state = irq_ts_save(); | |
6c833275 | 104 | asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */ |
bbbee467 | 105 | : \ |
faae8908 HX |
106 | : "c"((unsigned long)state.count + count), \ |
107 | "a"((unsigned long)state.count), \ | |
bbbee467 | 108 | "S"(in), "D"(result)); |
e4914012 | 109 | irq_ts_restore(ts_state); |
6c833275 ML |
110 | |
111 | padlock_output_block((uint32_t *)result, (uint32_t *)out, 5); | |
bbbee467 HX |
112 | |
113 | out: | |
114 | return err; | |
6c833275 ML |
115 | } |
116 | ||
bbbee467 HX |
117 | static int padlock_sha1_final(struct shash_desc *desc, u8 *out) |
118 | { | |
119 | u8 buf[4]; | |
120 | ||
121 | return padlock_sha1_finup(desc, buf, 0, out); | |
122 | } | |
123 | ||
124 | static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in, | |
125 | unsigned int count, u8 *out) | |
6c833275 ML |
126 | { |
127 | /* We can't store directly to *out as it may be unaligned. */ | |
128 | /* BTW Don't reduce the buffer size below 128 Bytes! | |
129 | * PadLock microcode needs it that big. */ | |
bbbee467 HX |
130 | char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT))); |
131 | struct padlock_sha_desc *dctx = shash_desc_ctx(desc); | |
132 | struct sha256_state state; | |
133 | unsigned int space; | |
134 | unsigned int leftover; | |
e4914012 | 135 | int ts_state; |
bbbee467 | 136 | int err; |
6c833275 | 137 | |
bbbee467 HX |
138 | dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
139 | err = crypto_shash_export(&dctx->fallback, &state); | |
140 | if (err) | |
141 | goto out; | |
142 | ||
143 | if (state.count + count > ULONG_MAX) | |
144 | return crypto_shash_finup(&dctx->fallback, in, count, out); | |
145 | ||
146 | leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1; | |
147 | space = SHA256_BLOCK_SIZE - leftover; | |
148 | if (space) { | |
149 | if (count > space) { | |
150 | err = crypto_shash_update(&dctx->fallback, in, space) ?: | |
151 | crypto_shash_export(&dctx->fallback, &state); | |
152 | if (err) | |
153 | goto out; | |
154 | count -= space; | |
155 | in += space; | |
156 | } else { | |
157 | memcpy(state.buf + leftover, in, count); | |
158 | in = state.buf; | |
159 | count += leftover; | |
160 | } | |
161 | } | |
162 | ||
163 | memcpy(result, &state.state, SHA256_DIGEST_SIZE); | |
6c833275 | 164 | |
e4914012 SS |
165 | /* prevent taking the spurious DNA fault with padlock. */ |
166 | ts_state = irq_ts_save(); | |
6c833275 | 167 | asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */ |
bbbee467 | 168 | : \ |
faae8908 HX |
169 | : "c"((unsigned long)state.count + count), \ |
170 | "a"((unsigned long)state.count), \ | |
bbbee467 | 171 | "S"(in), "D"(result)); |
e4914012 | 172 | irq_ts_restore(ts_state); |
6c833275 ML |
173 | |
174 | padlock_output_block((uint32_t *)result, (uint32_t *)out, 8); | |
bbbee467 HX |
175 | |
176 | out: | |
177 | return err; | |
6c833275 ML |
178 | } |
179 | ||
bbbee467 | 180 | static int padlock_sha256_final(struct shash_desc *desc, u8 *out) |
6c833275 | 181 | { |
bbbee467 | 182 | u8 buf[4]; |
6c833275 | 183 | |
bbbee467 | 184 | return padlock_sha256_finup(desc, buf, 0, out); |
6c833275 ML |
185 | } |
186 | ||
6010439f | 187 | static int padlock_cra_init(struct crypto_tfm *tfm) |
6c833275 | 188 | { |
bbbee467 | 189 | struct crypto_shash *hash = __crypto_shash_cast(tfm); |
6010439f | 190 | const char *fallback_driver_name = tfm->__crt_alg->cra_name; |
bbbee467 | 191 | struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm); |
7d024608 HX |
192 | struct crypto_shash *fallback_tfm; |
193 | int err = -ENOMEM; | |
6010439f | 194 | |
6c833275 | 195 | /* Allocate a fallback and abort if it failed. */ |
7d024608 HX |
196 | fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0, |
197 | CRYPTO_ALG_NEED_FALLBACK); | |
6010439f | 198 | if (IS_ERR(fallback_tfm)) { |
6c833275 ML |
199 | printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n", |
200 | fallback_driver_name); | |
7d024608 | 201 | err = PTR_ERR(fallback_tfm); |
bbbee467 | 202 | goto out; |
6c833275 ML |
203 | } |
204 | ||
bbbee467 HX |
205 | ctx->fallback = fallback_tfm; |
206 | hash->descsize += crypto_shash_descsize(fallback_tfm); | |
6c833275 | 207 | return 0; |
7d024608 | 208 | |
7d024608 HX |
209 | out: |
210 | return err; | |
6c833275 ML |
211 | } |
212 | ||
6c833275 ML |
213 | static void padlock_cra_exit(struct crypto_tfm *tfm) |
214 | { | |
bbbee467 | 215 | struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm); |
7d024608 | 216 | |
bbbee467 | 217 | crypto_free_shash(ctx->fallback); |
6c833275 ML |
218 | } |
219 | ||
bbbee467 HX |
220 | static struct shash_alg sha1_alg = { |
221 | .digestsize = SHA1_DIGEST_SIZE, | |
222 | .init = padlock_sha_init, | |
223 | .update = padlock_sha_update, | |
224 | .finup = padlock_sha1_finup, | |
225 | .final = padlock_sha1_final, | |
226 | .descsize = sizeof(struct padlock_sha_desc), | |
227 | .base = { | |
228 | .cra_name = "sha1", | |
229 | .cra_driver_name = "sha1-padlock", | |
230 | .cra_priority = PADLOCK_CRA_PRIORITY, | |
231 | .cra_flags = CRYPTO_ALG_TYPE_SHASH | | |
232 | CRYPTO_ALG_NEED_FALLBACK, | |
233 | .cra_blocksize = SHA1_BLOCK_SIZE, | |
234 | .cra_ctxsize = sizeof(struct padlock_sha_ctx), | |
235 | .cra_module = THIS_MODULE, | |
236 | .cra_init = padlock_cra_init, | |
237 | .cra_exit = padlock_cra_exit, | |
6c833275 ML |
238 | } |
239 | }; | |
240 | ||
bbbee467 HX |
241 | static struct shash_alg sha256_alg = { |
242 | .digestsize = SHA256_DIGEST_SIZE, | |
243 | .init = padlock_sha_init, | |
244 | .update = padlock_sha_update, | |
245 | .finup = padlock_sha256_finup, | |
246 | .final = padlock_sha256_final, | |
247 | .descsize = sizeof(struct padlock_sha_desc), | |
248 | .base = { | |
249 | .cra_name = "sha256", | |
250 | .cra_driver_name = "sha256-padlock", | |
251 | .cra_priority = PADLOCK_CRA_PRIORITY, | |
252 | .cra_flags = CRYPTO_ALG_TYPE_SHASH | | |
253 | CRYPTO_ALG_NEED_FALLBACK, | |
254 | .cra_blocksize = SHA256_BLOCK_SIZE, | |
255 | .cra_ctxsize = sizeof(struct padlock_sha_ctx), | |
256 | .cra_module = THIS_MODULE, | |
257 | .cra_init = padlock_cra_init, | |
258 | .cra_exit = padlock_cra_exit, | |
6c833275 ML |
259 | } |
260 | }; | |
261 | ||
6c833275 ML |
262 | static int __init padlock_init(void) |
263 | { | |
264 | int rc = -ENODEV; | |
265 | ||
266 | if (!cpu_has_phe) { | |
b43e726b | 267 | printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n"); |
6c833275 ML |
268 | return -ENODEV; |
269 | } | |
270 | ||
271 | if (!cpu_has_phe_enabled) { | |
b43e726b | 272 | printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n"); |
6c833275 ML |
273 | return -ENODEV; |
274 | } | |
275 | ||
bbbee467 | 276 | rc = crypto_register_shash(&sha1_alg); |
6c833275 ML |
277 | if (rc) |
278 | goto out; | |
279 | ||
bbbee467 | 280 | rc = crypto_register_shash(&sha256_alg); |
6c833275 ML |
281 | if (rc) |
282 | goto out_unreg1; | |
283 | ||
284 | printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n"); | |
285 | ||
286 | return 0; | |
287 | ||
288 | out_unreg1: | |
bbbee467 | 289 | crypto_unregister_shash(&sha1_alg); |
6c833275 ML |
290 | out: |
291 | printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n"); | |
292 | return rc; | |
293 | } | |
294 | ||
295 | static void __exit padlock_fini(void) | |
296 | { | |
bbbee467 HX |
297 | crypto_unregister_shash(&sha1_alg); |
298 | crypto_unregister_shash(&sha256_alg); | |
6c833275 ML |
299 | } |
300 | ||
301 | module_init(padlock_init); | |
302 | module_exit(padlock_fini); | |
303 | ||
304 | MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support."); | |
305 | MODULE_LICENSE("GPL"); | |
306 | MODULE_AUTHOR("Michal Ludvig"); | |
307 | ||
a760a665 HX |
308 | MODULE_ALIAS("sha1-all"); |
309 | MODULE_ALIAS("sha256-all"); | |
6c833275 ML |
310 | MODULE_ALIAS("sha1-padlock"); |
311 | MODULE_ALIAS("sha256-padlock"); |