crypto: padlock - Fix compile error on i386
[linux-2.6.git] / drivers / crypto / padlock-sha.c
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 struct padlock_sha_desc {
28         struct shash_desc fallback;
29 };
30
31 struct padlock_sha_ctx {
32         struct crypto_shash *fallback;
33 };
34
35 static int padlock_sha_init(struct shash_desc *desc)
36 {
37         struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
38         struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
39
40         dctx->fallback.tfm = ctx->fallback;
41         dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
42         return crypto_shash_init(&dctx->fallback);
43 }
44
45 static int padlock_sha_update(struct shash_desc *desc,
46                               const u8 *data, unsigned int length)
47 {
48         struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
49
50         dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
51         return crypto_shash_update(&dctx->fallback, data, length);
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
61 static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
62                               unsigned int count, u8 *out)
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. */
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;
72         int ts_state;
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);
101
102         /* prevent taking the spurious DNA fault with padlock. */
103         ts_state = irq_ts_save();
104         asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
105                       : \
106                       : "c"((unsigned long)state.count + count), \
107                         "a"((unsigned long)state.count), \
108                         "S"(in), "D"(result));
109         irq_ts_restore(ts_state);
110
111         padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
112
113 out:
114         return err;
115 }
116
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)
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. */
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;
135         int ts_state;
136         int err;
137
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);
164
165         /* prevent taking the spurious DNA fault with padlock. */
166         ts_state = irq_ts_save();
167         asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
168                       : \
169                       : "c"((unsigned long)state.count + count), \
170                         "a"((unsigned long)state.count), \
171                         "S"(in), "D"(result));
172         irq_ts_restore(ts_state);
173
174         padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
175
176 out:
177         return err;
178 }
179
180 static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
181 {
182         u8 buf[4];
183
184         return padlock_sha256_finup(desc, buf, 0, out);
185 }
186
187 static int padlock_cra_init(struct crypto_tfm *tfm)
188 {
189         struct crypto_shash *hash = __crypto_shash_cast(tfm);
190         const char *fallback_driver_name = tfm->__crt_alg->cra_name;
191         struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
192         struct crypto_shash *fallback_tfm;
193         int err = -ENOMEM;
194
195         /* Allocate a fallback and abort if it failed. */
196         fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
197                                           CRYPTO_ALG_NEED_FALLBACK);
198         if (IS_ERR(fallback_tfm)) {
199                 printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
200                        fallback_driver_name);
201                 err = PTR_ERR(fallback_tfm);
202                 goto out;
203         }
204
205         ctx->fallback = fallback_tfm;
206         hash->descsize += crypto_shash_descsize(fallback_tfm);
207         return 0;
208
209 out:
210         return err;
211 }
212
213 static void padlock_cra_exit(struct crypto_tfm *tfm)
214 {
215         struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
216
217         crypto_free_shash(ctx->fallback);
218 }
219
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,
238         }
239 };
240
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,
259         }
260 };
261
262 static int __init padlock_init(void)
263 {
264         int rc = -ENODEV;
265
266         if (!cpu_has_phe) {
267                 printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n");
268                 return -ENODEV;
269         }
270
271         if (!cpu_has_phe_enabled) {
272                 printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
273                 return -ENODEV;
274         }
275
276         rc = crypto_register_shash(&sha1_alg);
277         if (rc)
278                 goto out;
279
280         rc = crypto_register_shash(&sha256_alg);
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:
289         crypto_unregister_shash(&sha1_alg);
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 {
297         crypto_unregister_shash(&sha1_alg);
298         crypto_unregister_shash(&sha256_alg);
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
308 MODULE_ALIAS("sha1-all");
309 MODULE_ALIAS("sha256-all");
310 MODULE_ALIAS("sha1-padlock");
311 MODULE_ALIAS("sha256-padlock");