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