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Linux 2.6.33-rc6
[cris-mirror.git] / drivers / crypto / padlock-sha.c
blob0af80577dc7bbfd9d80f276765e5afb7d218c067
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/sha.h>
17 #include <linux/err.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
23 #include <linux/scatterlist.h>
24 #include <asm/i387.h>
25 #include "padlock.h"
26
27 #ifdef CONFIG_64BIT
28 #define STACK_ALIGN 16
29 #else
30 #define STACK_ALIGN 4
31 #endif
32
33 struct padlock_sha_desc {
34 struct shash_desc fallback;
35 };
36
37 struct padlock_sha_ctx {
38 struct crypto_shash *fallback;
39 };
40
41 static int padlock_sha_init(struct shash_desc *desc)
42 {
43 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
44 struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
45
46 dctx->fallback.tfm = ctx->fallback;
47 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
48 return crypto_shash_init(&dctx->fallback);
49 }
50
51 static int padlock_sha_update(struct shash_desc *desc,
52 const u8 *data, unsigned int length)
53 {
54 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
55
56 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
57 return crypto_shash_update(&dctx->fallback, data, length);
58 }
59
60 static inline void padlock_output_block(uint32_t *src,
61 uint32_t *dst, size_t count)
62 {
63 while (count--)
64 *dst++ = swab32(*src++);
65 }
66
67 static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
68 unsigned int count, u8 *out)
69 {
70 /* We can't store directly to *out as it may be unaligned. */
71 /* BTW Don't reduce the buffer size below 128 Bytes!
72 * PadLock microcode needs it that big. */
73 char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
74 ((aligned(STACK_ALIGN)));
75 char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
76 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
77 struct sha1_state state;
78 unsigned int space;
79 unsigned int leftover;
80 int ts_state;
81 int err;
82
83 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
84 err = crypto_shash_export(&dctx->fallback, &state);
85 if (err)
86 goto out;
87
88 if (state.count + count > ULONG_MAX)
89 return crypto_shash_finup(&dctx->fallback, in, count, out);
90
91 leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
92 space = SHA1_BLOCK_SIZE - leftover;
93 if (space) {
94 if (count > space) {
95 err = crypto_shash_update(&dctx->fallback, in, space) ?:
96 crypto_shash_export(&dctx->fallback, &state);
97 if (err)
98 goto out;
99 count -= space;
100 in += space;
101 } else {
102 memcpy(state.buffer + leftover, in, count);
103 in = state.buffer;
104 count += leftover;
105 state.count &= ~(SHA1_BLOCK_SIZE - 1);
106 }
107 }
108
109 memcpy(result, &state.state, SHA1_DIGEST_SIZE);
110
111 /* prevent taking the spurious DNA fault with padlock. */
112 ts_state = irq_ts_save();
113 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
114 : \
115 : "c"((unsigned long)state.count + count), \
116 "a"((unsigned long)state.count), \
117 "S"(in), "D"(result));
118 irq_ts_restore(ts_state);
119
120 padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
121
122 out:
123 return err;
124 }
125
126 static int padlock_sha1_final(struct shash_desc *desc, u8 *out)
127 {
128 u8 buf[4];
129
130 return padlock_sha1_finup(desc, buf, 0, out);
131 }
132
133 static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in,
134 unsigned int count, u8 *out)
135 {
136 /* We can't store directly to *out as it may be unaligned. */
137 /* BTW Don't reduce the buffer size below 128 Bytes!
138 * PadLock microcode needs it that big. */
139 char buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
140 ((aligned(STACK_ALIGN)));
141 char *result = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
142 struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
143 struct sha256_state state;
144 unsigned int space;
145 unsigned int leftover;
146 int ts_state;
147 int err;
148
149 dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
150 err = crypto_shash_export(&dctx->fallback, &state);
151 if (err)
152 goto out;
153
154 if (state.count + count > ULONG_MAX)
155 return crypto_shash_finup(&dctx->fallback, in, count, out);
156
157 leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
158 space = SHA256_BLOCK_SIZE - leftover;
159 if (space) {
160 if (count > space) {
161 err = crypto_shash_update(&dctx->fallback, in, space) ?:
162 crypto_shash_export(&dctx->fallback, &state);
163 if (err)
164 goto out;
165 count -= space;
166 in += space;
167 } else {
168 memcpy(state.buf + leftover, in, count);
169 in = state.buf;
170 count += leftover;
171 state.count &= ~(SHA1_BLOCK_SIZE - 1);
172 }
173 }
174
175 memcpy(result, &state.state, SHA256_DIGEST_SIZE);
176
177 /* prevent taking the spurious DNA fault with padlock. */
178 ts_state = irq_ts_save();
179 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
180 : \
181 : "c"((unsigned long)state.count + count), \
182 "a"((unsigned long)state.count), \
183 "S"(in), "D"(result));
184 irq_ts_restore(ts_state);
185
186 padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
187
188 out:
189 return err;
190 }
191
192 static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
193 {
194 u8 buf[4];
195
196 return padlock_sha256_finup(desc, buf, 0, out);
197 }
198
199 static int padlock_cra_init(struct crypto_tfm *tfm)
200 {
201 struct crypto_shash *hash = __crypto_shash_cast(tfm);
202 const char *fallback_driver_name = tfm->__crt_alg->cra_name;
203 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
204 struct crypto_shash *fallback_tfm;
205 int err = -ENOMEM;
206
207 /* Allocate a fallback and abort if it failed. */
208 fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
209 CRYPTO_ALG_NEED_FALLBACK);
210 if (IS_ERR(fallback_tfm)) {
211 printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
212 fallback_driver_name);
213 err = PTR_ERR(fallback_tfm);
214 goto out;
215 }
216
217 ctx->fallback = fallback_tfm;
218 hash->descsize += crypto_shash_descsize(fallback_tfm);
219 return 0;
220
221 out:
222 return err;
223 }
224
225 static void padlock_cra_exit(struct crypto_tfm *tfm)
226 {
227 struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
228
229 crypto_free_shash(ctx->fallback);
230 }
231
232 static struct shash_alg sha1_alg = {
233 .digestsize = SHA1_DIGEST_SIZE,
234 .init = padlock_sha_init,
235 .update = padlock_sha_update,
236 .finup = padlock_sha1_finup,
237 .final = padlock_sha1_final,
238 .descsize = sizeof(struct padlock_sha_desc),
239 .base = {
240 .cra_name = "sha1",
241 .cra_driver_name = "sha1-padlock",
242 .cra_priority = PADLOCK_CRA_PRIORITY,
243 .cra_flags = CRYPTO_ALG_TYPE_SHASH |
244 CRYPTO_ALG_NEED_FALLBACK,
245 .cra_blocksize = SHA1_BLOCK_SIZE,
246 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
247 .cra_module = THIS_MODULE,
248 .cra_init = padlock_cra_init,
249 .cra_exit = padlock_cra_exit,
250 }
251 };
252
253 static struct shash_alg sha256_alg = {
254 .digestsize = SHA256_DIGEST_SIZE,
255 .init = padlock_sha_init,
256 .update = padlock_sha_update,
257 .finup = padlock_sha256_finup,
258 .final = padlock_sha256_final,
259 .descsize = sizeof(struct padlock_sha_desc),
260 .base = {
261 .cra_name = "sha256",
262 .cra_driver_name = "sha256-padlock",
263 .cra_priority = PADLOCK_CRA_PRIORITY,
264 .cra_flags = CRYPTO_ALG_TYPE_SHASH |
265 CRYPTO_ALG_NEED_FALLBACK,
266 .cra_blocksize = SHA256_BLOCK_SIZE,
267 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
268 .cra_module = THIS_MODULE,
269 .cra_init = padlock_cra_init,
270 .cra_exit = padlock_cra_exit,
271 }
272 };
273
274 static int __init padlock_init(void)
275 {
276 int rc = -ENODEV;
277
278 if (!cpu_has_phe) {
279 printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n");
280 return -ENODEV;
281 }
282
283 if (!cpu_has_phe_enabled) {
284 printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
285 return -ENODEV;
286 }
287
288 rc = crypto_register_shash(&sha1_alg);
289 if (rc)
290 goto out;
291
292 rc = crypto_register_shash(&sha256_alg);
293 if (rc)
294 goto out_unreg1;
295
296 printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
297
298 return 0;
299
300 out_unreg1:
301 crypto_unregister_shash(&sha1_alg);
302 out:
303 printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
304 return rc;
305 }
306
307 static void __exit padlock_fini(void)
308 {
309 crypto_unregister_shash(&sha1_alg);
310 crypto_unregister_shash(&sha256_alg);
311 }
312
313 module_init(padlock_init);
314 module_exit(padlock_fini);
315
316 MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
317 MODULE_LICENSE("GPL");
318 MODULE_AUTHOR("Michal Ludvig");
319
320 MODULE_ALIAS("sha1-all");
321 MODULE_ALIAS("sha256-all");
322 MODULE_ALIAS("sha1-padlock");
323 MODULE_ALIAS("sha256-padlock");
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