4 * Support for VIA PadLock hardware crypto engine.
6 * Copyright (c) 2006 Michal Ludvig <michal@logix.cz>
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.
15 #include <crypto/algapi.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/cryptohash.h>
22 #include <linux/interrupt.h>
23 #include <linux/kernel.h>
24 #include <linux/scatterlist.h>
28 #define SHA1_DEFAULT_FALLBACK "sha1-generic"
29 #define SHA256_DEFAULT_FALLBACK "sha256-generic"
31 struct padlock_sha_ctx
{
35 void (*f_sha_padlock
)(const char *in
, char *out
, int count
);
36 struct hash_desc fallback
;
39 static inline struct padlock_sha_ctx
*ctx(struct crypto_tfm
*tfm
)
41 return crypto_tfm_ctx(tfm
);
44 /* We'll need aligned address on the stack */
45 #define NEAREST_ALIGNED(ptr) \
46 ((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
48 static struct crypto_alg sha1_alg
, sha256_alg
;
50 static void padlock_sha_bypass(struct crypto_tfm
*tfm
)
55 crypto_hash_init(&ctx(tfm
)->fallback
);
56 if (ctx(tfm
)->data
&& ctx(tfm
)->used
) {
57 struct scatterlist sg
;
59 sg_init_one(&sg
, ctx(tfm
)->data
, ctx(tfm
)->used
);
60 crypto_hash_update(&ctx(tfm
)->fallback
, &sg
, sg
.length
);
67 static void padlock_sha_init(struct crypto_tfm
*tfm
)
73 static void padlock_sha_update(struct crypto_tfm
*tfm
,
74 const uint8_t *data
, unsigned int length
)
76 /* Our buffer is always one page. */
77 if (unlikely(!ctx(tfm
)->bypass
&&
78 (ctx(tfm
)->used
+ length
> PAGE_SIZE
)))
79 padlock_sha_bypass(tfm
);
81 if (unlikely(ctx(tfm
)->bypass
)) {
82 struct scatterlist sg
;
83 sg_init_one(&sg
, (uint8_t *)data
, length
);
84 crypto_hash_update(&ctx(tfm
)->fallback
, &sg
, length
);
88 memcpy(ctx(tfm
)->data
+ ctx(tfm
)->used
, data
, length
);
89 ctx(tfm
)->used
+= length
;
92 static inline void padlock_output_block(uint32_t *src
,
93 uint32_t *dst
, size_t count
)
96 *dst
++ = swab32(*src
++);
99 static void padlock_do_sha1(const char *in
, char *out
, int count
)
101 /* We can't store directly to *out as it may be unaligned. */
102 /* BTW Don't reduce the buffer size below 128 Bytes!
103 * PadLock microcode needs it that big. */
105 char *result
= NEAREST_ALIGNED(buf
);
108 ((uint32_t *)result
)[0] = SHA1_H0
;
109 ((uint32_t *)result
)[1] = SHA1_H1
;
110 ((uint32_t *)result
)[2] = SHA1_H2
;
111 ((uint32_t *)result
)[3] = SHA1_H3
;
112 ((uint32_t *)result
)[4] = SHA1_H4
;
114 /* prevent taking the spurious DNA fault with padlock. */
115 ts_state
= irq_ts_save();
116 asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
117 : "+S"(in
), "+D"(result
)
118 : "c"(count
), "a"(0));
119 irq_ts_restore(ts_state
);
121 padlock_output_block((uint32_t *)result
, (uint32_t *)out
, 5);
124 static void padlock_do_sha256(const char *in
, char *out
, int count
)
126 /* We can't store directly to *out as it may be unaligned. */
127 /* BTW Don't reduce the buffer size below 128 Bytes!
128 * PadLock microcode needs it that big. */
130 char *result
= NEAREST_ALIGNED(buf
);
133 ((uint32_t *)result
)[0] = SHA256_H0
;
134 ((uint32_t *)result
)[1] = SHA256_H1
;
135 ((uint32_t *)result
)[2] = SHA256_H2
;
136 ((uint32_t *)result
)[3] = SHA256_H3
;
137 ((uint32_t *)result
)[4] = SHA256_H4
;
138 ((uint32_t *)result
)[5] = SHA256_H5
;
139 ((uint32_t *)result
)[6] = SHA256_H6
;
140 ((uint32_t *)result
)[7] = SHA256_H7
;
142 /* prevent taking the spurious DNA fault with padlock. */
143 ts_state
= irq_ts_save();
144 asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
145 : "+S"(in
), "+D"(result
)
146 : "c"(count
), "a"(0));
147 irq_ts_restore(ts_state
);
149 padlock_output_block((uint32_t *)result
, (uint32_t *)out
, 8);
152 static void padlock_sha_final(struct crypto_tfm
*tfm
, uint8_t *out
)
154 if (unlikely(ctx(tfm
)->bypass
)) {
155 crypto_hash_final(&ctx(tfm
)->fallback
, out
);
156 ctx(tfm
)->bypass
= 0;
160 /* Pass the input buffer to PadLock microcode... */
161 ctx(tfm
)->f_sha_padlock(ctx(tfm
)->data
, out
, ctx(tfm
)->used
);
166 static int padlock_cra_init(struct crypto_tfm
*tfm
)
168 const char *fallback_driver_name
= tfm
->__crt_alg
->cra_name
;
169 struct crypto_hash
*fallback_tfm
;
171 /* For now we'll allocate one page. This
172 * could eventually be configurable one day. */
173 ctx(tfm
)->data
= (char *)__get_free_page(GFP_KERNEL
);
177 /* Allocate a fallback and abort if it failed. */
178 fallback_tfm
= crypto_alloc_hash(fallback_driver_name
, 0,
180 CRYPTO_ALG_NEED_FALLBACK
);
181 if (IS_ERR(fallback_tfm
)) {
182 printk(KERN_WARNING PFX
"Fallback driver '%s' could not be loaded!\n",
183 fallback_driver_name
);
184 free_page((unsigned long)(ctx(tfm
)->data
));
185 return PTR_ERR(fallback_tfm
);
188 ctx(tfm
)->fallback
.tfm
= fallback_tfm
;
192 static int padlock_sha1_cra_init(struct crypto_tfm
*tfm
)
194 ctx(tfm
)->f_sha_padlock
= padlock_do_sha1
;
196 return padlock_cra_init(tfm
);
199 static int padlock_sha256_cra_init(struct crypto_tfm
*tfm
)
201 ctx(tfm
)->f_sha_padlock
= padlock_do_sha256
;
203 return padlock_cra_init(tfm
);
206 static void padlock_cra_exit(struct crypto_tfm
*tfm
)
208 if (ctx(tfm
)->data
) {
209 free_page((unsigned long)(ctx(tfm
)->data
));
210 ctx(tfm
)->data
= NULL
;
213 crypto_free_hash(ctx(tfm
)->fallback
.tfm
);
214 ctx(tfm
)->fallback
.tfm
= NULL
;
217 static struct crypto_alg sha1_alg
= {
219 .cra_driver_name
= "sha1-padlock",
220 .cra_priority
= PADLOCK_CRA_PRIORITY
,
221 .cra_flags
= CRYPTO_ALG_TYPE_DIGEST
|
222 CRYPTO_ALG_NEED_FALLBACK
,
223 .cra_blocksize
= SHA1_BLOCK_SIZE
,
224 .cra_ctxsize
= sizeof(struct padlock_sha_ctx
),
225 .cra_module
= THIS_MODULE
,
226 .cra_list
= LIST_HEAD_INIT(sha1_alg
.cra_list
),
227 .cra_init
= padlock_sha1_cra_init
,
228 .cra_exit
= padlock_cra_exit
,
231 .dia_digestsize
= SHA1_DIGEST_SIZE
,
232 .dia_init
= padlock_sha_init
,
233 .dia_update
= padlock_sha_update
,
234 .dia_final
= padlock_sha_final
,
239 static struct crypto_alg sha256_alg
= {
240 .cra_name
= "sha256",
241 .cra_driver_name
= "sha256-padlock",
242 .cra_priority
= PADLOCK_CRA_PRIORITY
,
243 .cra_flags
= CRYPTO_ALG_TYPE_DIGEST
|
244 CRYPTO_ALG_NEED_FALLBACK
,
245 .cra_blocksize
= SHA256_BLOCK_SIZE
,
246 .cra_ctxsize
= sizeof(struct padlock_sha_ctx
),
247 .cra_module
= THIS_MODULE
,
248 .cra_list
= LIST_HEAD_INIT(sha256_alg
.cra_list
),
249 .cra_init
= padlock_sha256_cra_init
,
250 .cra_exit
= padlock_cra_exit
,
253 .dia_digestsize
= SHA256_DIGEST_SIZE
,
254 .dia_init
= padlock_sha_init
,
255 .dia_update
= padlock_sha_update
,
256 .dia_final
= padlock_sha_final
,
261 static int __init
padlock_init(void)
266 printk(KERN_NOTICE PFX
"VIA PadLock Hash Engine not detected.\n");
270 if (!cpu_has_phe_enabled
) {
271 printk(KERN_NOTICE PFX
"VIA PadLock detected, but not enabled. Hmm, strange...\n");
275 rc
= crypto_register_alg(&sha1_alg
);
279 rc
= crypto_register_alg(&sha256_alg
);
283 printk(KERN_NOTICE PFX
"Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
288 crypto_unregister_alg(&sha1_alg
);
290 printk(KERN_ERR PFX
"VIA PadLock SHA1/SHA256 initialization failed.\n");
294 static void __exit
padlock_fini(void)
296 crypto_unregister_alg(&sha1_alg
);
297 crypto_unregister_alg(&sha256_alg
);
300 module_init(padlock_init
);
301 module_exit(padlock_fini
);
303 MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
304 MODULE_LICENSE("GPL");
305 MODULE_AUTHOR("Michal Ludvig");
307 MODULE_ALIAS("sha1-all");
308 MODULE_ALIAS("sha256-all");
309 MODULE_ALIAS("sha1-padlock");
310 MODULE_ALIAS("sha256-padlock");
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