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authorMichal Ludvig <michal@logix.cz>2006-07-11 22:29:38 -0400
committerHerbert Xu <herbert@gondor.apana.org.au>2006-09-20 21:40:59 -0400
commit6c833275152b454d311f0e70b5e6bf028b4a2aaf (patch)
treea08d9d1057730c1c5dde31de1db0bd81810ee8d2 /drivers/crypto/padlock-sha.c
parentccc17c34d676f116bd09dd36a3b01627bc6a2f8a (diff)
[CRYPTO] padlock: Driver for SHA1 / SHA256 algorithms
Support for SHA1 / SHA256 algorithms in VIA C7 processors. Signed-off-by: Michal Ludvig <michal@logix.cz> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/padlock-sha.c')
-rw-r--r--drivers/crypto/padlock-sha.c339
1 files changed, 339 insertions, 0 deletions
diff --git a/drivers/crypto/padlock-sha.c b/drivers/crypto/padlock-sha.c
new file mode 100644
index 000000000000..f7010038033b
--- /dev/null
+++ b/drivers/crypto/padlock-sha.c
@@ -0,0 +1,339 @@
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 <linux/module.h>
16#include <linux/init.h>
17#include <linux/errno.h>
18#include <linux/crypto.h>
19#include <linux/cryptohash.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/scatterlist.h>
23#include "padlock.h"
24
25#define SHA1_DEFAULT_FALLBACK "sha1-generic"
26#define SHA1_DIGEST_SIZE 20
27#define SHA1_HMAC_BLOCK_SIZE 64
28
29#define SHA256_DEFAULT_FALLBACK "sha256-generic"
30#define SHA256_DIGEST_SIZE 32
31#define SHA256_HMAC_BLOCK_SIZE 64
32
33static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
34static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;
35
36module_param(sha1_fallback, charp, 0644);
37module_param(sha256_fallback, charp, 0644);
38
39MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
40 SHA1_DEFAULT_FALLBACK);
41MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
42 SHA256_DEFAULT_FALLBACK);
43
44struct padlock_sha_ctx {
45 char *data;
46 size_t used;
47 int bypass;
48 void (*f_sha_padlock)(const char *in, char *out, int count);
49 struct crypto_tfm *fallback_tfm;
50};
51
52static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
53{
54 return (struct padlock_sha_ctx *)(crypto_tfm_ctx(tfm));
55}
56
57/* We'll need aligned address on the stack */
58#define NEAREST_ALIGNED(ptr) \
59 ((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
60
61static struct crypto_alg sha1_alg, sha256_alg;
62
63static void padlock_sha_bypass(struct crypto_tfm *tfm)
64{
65 if (ctx(tfm)->bypass)
66 return;
67
68 BUG_ON(!ctx(tfm)->fallback_tfm);
69
70 crypto_digest_init(ctx(tfm)->fallback_tfm);
71 if (ctx(tfm)->data && ctx(tfm)->used) {
72 struct scatterlist sg;
73
74 sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
75 crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
76 }
77
78 ctx(tfm)->used = 0;
79 ctx(tfm)->bypass = 1;
80}
81
82static void padlock_sha_init(struct crypto_tfm *tfm)
83{
84 ctx(tfm)->used = 0;
85 ctx(tfm)->bypass = 0;
86}
87
88static void padlock_sha_update(struct crypto_tfm *tfm,
89 const uint8_t *data, unsigned int length)
90{
91 /* Our buffer is always one page. */
92 if (unlikely(!ctx(tfm)->bypass &&
93 (ctx(tfm)->used + length > PAGE_SIZE)))
94 padlock_sha_bypass(tfm);
95
96 if (unlikely(ctx(tfm)->bypass)) {
97 struct scatterlist sg;
98 BUG_ON(!ctx(tfm)->fallback_tfm);
99 sg_set_buf(&sg, (uint8_t *)data, length);
100 crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
101 return;
102 }
103
104 memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
105 ctx(tfm)->used += length;
106}
107
108static inline void padlock_output_block(uint32_t *src,
109 uint32_t *dst, size_t count)
110{
111 while (count--)
112 *dst++ = swab32(*src++);
113}
114
115void padlock_do_sha1(const char *in, char *out, int count)
116{
117 /* We can't store directly to *out as it may be unaligned. */
118 /* BTW Don't reduce the buffer size below 128 Bytes!
119 * PadLock microcode needs it that big. */
120 char buf[128+16];
121 char *result = NEAREST_ALIGNED(buf);
122
123 ((uint32_t *)result)[0] = 0x67452301;
124 ((uint32_t *)result)[1] = 0xEFCDAB89;
125 ((uint32_t *)result)[2] = 0x98BADCFE;
126 ((uint32_t *)result)[3] = 0x10325476;
127 ((uint32_t *)result)[4] = 0xC3D2E1F0;
128
129 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
130 : "+S"(in), "+D"(result)
131 : "c"(count), "a"(0));
132
133 padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
134}
135
136void padlock_do_sha256(const char *in, char *out, int count)
137{
138 /* We can't store directly to *out as it may be unaligned. */
139 /* BTW Don't reduce the buffer size below 128 Bytes!
140 * PadLock microcode needs it that big. */
141 char buf[128+16];
142 char *result = NEAREST_ALIGNED(buf);
143
144 ((uint32_t *)result)[0] = 0x6A09E667;
145 ((uint32_t *)result)[1] = 0xBB67AE85;
146 ((uint32_t *)result)[2] = 0x3C6EF372;
147 ((uint32_t *)result)[3] = 0xA54FF53A;
148 ((uint32_t *)result)[4] = 0x510E527F;
149 ((uint32_t *)result)[5] = 0x9B05688C;
150 ((uint32_t *)result)[6] = 0x1F83D9AB;
151 ((uint32_t *)result)[7] = 0x5BE0CD19;
152
153 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
154 : "+S"(in), "+D"(result)
155 : "c"(count), "a"(0));
156
157 padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
158}
159
160static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out)
161{
162 if (unlikely(ctx(tfm)->bypass)) {
163 BUG_ON(!ctx(tfm)->fallback_tfm);
164 crypto_digest_final(ctx(tfm)->fallback_tfm, out);
165 ctx(tfm)->bypass = 0;
166 return;
167 }
168
169 /* Pass the input buffer to PadLock microcode... */
170 ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);
171
172 ctx(tfm)->used = 0;
173}
174
175static int padlock_cra_init(struct crypto_tfm *tfm, const char *fallback_driver_name)
176{
177 /* For now we'll allocate one page. This
178 * could eventually be configurable one day. */
179 ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
180 if (!ctx(tfm)->data)
181 return -ENOMEM;
182
183 /* Allocate a fallback and abort if it failed. */
184 ctx(tfm)->fallback_tfm = crypto_alloc_tfm(fallback_driver_name, 0);
185 if (!ctx(tfm)->fallback_tfm) {
186 printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
187 fallback_driver_name);
188 free_page((unsigned long)(ctx(tfm)->data));
189 return -ENOENT;
190 }
191
192 return 0;
193}
194
195static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
196{
197 ctx(tfm)->f_sha_padlock = padlock_do_sha1;
198
199 return padlock_cra_init(tfm, sha1_fallback);
200}
201
202static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
203{
204 ctx(tfm)->f_sha_padlock = padlock_do_sha256;
205
206 return padlock_cra_init(tfm, sha256_fallback);
207}
208
209static void padlock_cra_exit(struct crypto_tfm *tfm)
210{
211 if (ctx(tfm)->data) {
212 free_page((unsigned long)(ctx(tfm)->data));
213 ctx(tfm)->data = NULL;
214 }
215
216 BUG_ON(!ctx(tfm)->fallback_tfm);
217 crypto_free_tfm(ctx(tfm)->fallback_tfm);
218 ctx(tfm)->fallback_tfm = NULL;
219}
220
221static struct crypto_alg sha1_alg = {
222 .cra_name = "sha1",
223 .cra_driver_name = "sha1-padlock",
224 .cra_priority = PADLOCK_CRA_PRIORITY,
225 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
226 .cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
227 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
228 .cra_module = THIS_MODULE,
229 .cra_list = LIST_HEAD_INIT(sha1_alg.cra_list),
230 .cra_init = padlock_sha1_cra_init,
231 .cra_exit = padlock_cra_exit,
232 .cra_u = {
233 .digest = {
234 .dia_digestsize = SHA1_DIGEST_SIZE,
235 .dia_init = padlock_sha_init,
236 .dia_update = padlock_sha_update,
237 .dia_final = padlock_sha_final,
238 }
239 }
240};
241
242static struct crypto_alg sha256_alg = {
243 .cra_name = "sha256",
244 .cra_driver_name = "sha256-padlock",
245 .cra_priority = PADLOCK_CRA_PRIORITY,
246 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
247 .cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
248 .cra_ctxsize = sizeof(struct padlock_sha_ctx),
249 .cra_module = THIS_MODULE,
250 .cra_list = LIST_HEAD_INIT(sha256_alg.cra_list),
251 .cra_init = padlock_sha256_cra_init,
252 .cra_exit = padlock_cra_exit,
253 .cra_u = {
254 .digest = {
255 .dia_digestsize = SHA256_DIGEST_SIZE,
256 .dia_init = padlock_sha_init,
257 .dia_update = padlock_sha_update,
258 .dia_final = padlock_sha_final,
259 }
260 }
261};
262
263static void __init padlock_sha_check_fallbacks(void)
264{
265 static struct crypto_tfm *tfm_sha1, *tfm_sha256;
266
267 /* We'll try to allocate one TFM for each fallback
268 * to test that the modules are available. */
269 tfm_sha1 = crypto_alloc_tfm(sha1_fallback, 0);
270 if (!tfm_sha1) {
271 printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
272 sha1_alg.cra_name, sha1_fallback);
273 } else {
274 printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha1_alg.cra_name,
275 crypto_tfm_alg_driver_name(tfm_sha1), crypto_tfm_alg_priority(tfm_sha1));
276 crypto_free_tfm(tfm_sha1);
277 }
278
279 tfm_sha256 = crypto_alloc_tfm(sha256_fallback, 0);
280 if (!tfm_sha256) {
281 printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
282 sha256_alg.cra_name, sha256_fallback);
283 } else {
284 printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha256_alg.cra_name,
285 crypto_tfm_alg_driver_name(tfm_sha256), crypto_tfm_alg_priority(tfm_sha256));
286 crypto_free_tfm(tfm_sha256);
287 }
288}
289
290static int __init padlock_init(void)
291{
292 int rc = -ENODEV;
293
294 if (!cpu_has_phe) {
295 printk(KERN_ERR PFX "VIA PadLock Hash Engine not detected.\n");
296 return -ENODEV;
297 }
298
299 if (!cpu_has_phe_enabled) {
300 printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
301 return -ENODEV;
302 }
303
304 padlock_sha_check_fallbacks();
305
306 rc = crypto_register_alg(&sha1_alg);
307 if (rc)
308 goto out;
309
310 rc = crypto_register_alg(&sha256_alg);
311 if (rc)
312 goto out_unreg1;
313
314 printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
315
316 return 0;
317
318out_unreg1:
319 crypto_unregister_alg(&sha1_alg);
320out:
321 printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
322 return rc;
323}
324
325static void __exit padlock_fini(void)
326{
327 crypto_unregister_alg(&sha1_alg);
328 crypto_unregister_alg(&sha256_alg);
329}
330
331module_init(padlock_init);
332module_exit(padlock_fini);
333
334MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
335MODULE_LICENSE("GPL");
336MODULE_AUTHOR("Michal Ludvig");
337
338MODULE_ALIAS("sha1-padlock");
339MODULE_ALIAS("sha256-padlock");