[deliverable/linux.git] / drivers / crypto / padlock-sha.c

/*
 * Cryptographic API.
 *
 * Support for VIA PadLock hardware crypto engine.
 *
 * Copyright (c) 2006  Michal Ludvig <michal@logix.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/scatterlist.h>
#include "padlock.h"

#define SHA1_DEFAULT_FALLBACK	"sha1-generic"
#define SHA1_DIGEST_SIZE        20
#define SHA1_HMAC_BLOCK_SIZE    64

#define SHA256_DEFAULT_FALLBACK "sha256-generic"
#define SHA256_DIGEST_SIZE      32
#define SHA256_HMAC_BLOCK_SIZE  64

static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;

module_param(sha1_fallback, charp, 0644);
module_param(sha256_fallback, charp, 0644);

MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
		 SHA1_DEFAULT_FALLBACK);
MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
		 SHA256_DEFAULT_FALLBACK);

struct padlock_sha_ctx {
	char		*data;
	size_t		used;
	int		bypass;
	void (*f_sha_padlock)(const char *in, char *out, int count);
	struct crypto_tfm *fallback_tfm;
};

static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
{
	return (struct padlock_sha_ctx *)(crypto_tfm_ctx(tfm));
}

/* We'll need aligned address on the stack */
#define NEAREST_ALIGNED(ptr) \
	((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))

static struct crypto_alg sha1_alg, sha256_alg;

static void padlock_sha_bypass(struct crypto_tfm *tfm)
{
	if (ctx(tfm)->bypass)
		return;

	BUG_ON(!ctx(tfm)->fallback_tfm);

	crypto_digest_init(ctx(tfm)->fallback_tfm);
	if (ctx(tfm)->data && ctx(tfm)->used) {
		struct scatterlist sg;

		sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
		crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
	}

	ctx(tfm)->used = 0;
	ctx(tfm)->bypass = 1;
}

static void padlock_sha_init(struct crypto_tfm *tfm)
{
	ctx(tfm)->used = 0;
	ctx(tfm)->bypass = 0;
}

static void padlock_sha_update(struct crypto_tfm *tfm,
			const uint8_t *data, unsigned int length)
{
	/* Our buffer is always one page. */
	if (unlikely(!ctx(tfm)->bypass &&
		     (ctx(tfm)->used + length > PAGE_SIZE)))
		padlock_sha_bypass(tfm);

	if (unlikely(ctx(tfm)->bypass)) {
		struct scatterlist sg;
		BUG_ON(!ctx(tfm)->fallback_tfm);
		sg_set_buf(&sg, (uint8_t *)data, length);
		crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
		return;
	}

	memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
	ctx(tfm)->used += length;
}

static inline void padlock_output_block(uint32_t *src,
		 	uint32_t *dst, size_t count)
{
	while (count--)
		*dst++ = swab32(*src++);
}

void padlock_do_sha1(const char *in, char *out, int count)
{
	/* We can't store directly to *out as it may be unaligned. */
	/* BTW Don't reduce the buffer size below 128 Bytes!
	 *     PadLock microcode needs it that big. */
	char buf[128+16];
	char *result = NEAREST_ALIGNED(buf);

	((uint32_t *)result)[0] = 0x67452301;
	((uint32_t *)result)[1] = 0xEFCDAB89;
	((uint32_t *)result)[2] = 0x98BADCFE;
	((uint32_t *)result)[3] = 0x10325476;
	((uint32_t *)result)[4] = 0xC3D2E1F0;
 
	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
		      : "+S"(in), "+D"(result)
		      : "c"(count), "a"(0));

	padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
}

void padlock_do_sha256(const char *in, char *out, int count)
{
	/* We can't store directly to *out as it may be unaligned. */
	/* BTW Don't reduce the buffer size below 128 Bytes!
	 *     PadLock microcode needs it that big. */
	char buf[128+16];
	char *result = NEAREST_ALIGNED(buf);

	((uint32_t *)result)[0] = 0x6A09E667;
	((uint32_t *)result)[1] = 0xBB67AE85;
	((uint32_t *)result)[2] = 0x3C6EF372;
	((uint32_t *)result)[3] = 0xA54FF53A;
	((uint32_t *)result)[4] = 0x510E527F;
	((uint32_t *)result)[5] = 0x9B05688C;
	((uint32_t *)result)[6] = 0x1F83D9AB;
	((uint32_t *)result)[7] = 0x5BE0CD19;

	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
		      : "+S"(in), "+D"(result)
		      : "c"(count), "a"(0));

	padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
}

static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out)
{
	if (unlikely(ctx(tfm)->bypass)) {
		BUG_ON(!ctx(tfm)->fallback_tfm);
		crypto_digest_final(ctx(tfm)->fallback_tfm, out);
		ctx(tfm)->bypass = 0;
		return;
	}

	/* Pass the input buffer to PadLock microcode... */
	ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);

	ctx(tfm)->used = 0;
}

static int padlock_cra_init(struct crypto_tfm *tfm, const char *fallback_driver_name)
{
	/* For now we'll allocate one page. This
	 * could eventually be configurable one day. */
	ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
	if (!ctx(tfm)->data)
		return -ENOMEM;

	/* Allocate a fallback and abort if it failed. */
	ctx(tfm)->fallback_tfm = crypto_alloc_tfm(fallback_driver_name, 0);
	if (!ctx(tfm)->fallback_tfm) {
		printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
		       fallback_driver_name);
		free_page((unsigned long)(ctx(tfm)->data));
		return -ENOENT;
	}

	return 0;
}

static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
{
	ctx(tfm)->f_sha_padlock = padlock_do_sha1;

	return padlock_cra_init(tfm, sha1_fallback);
}

static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
{
	ctx(tfm)->f_sha_padlock = padlock_do_sha256;

	return padlock_cra_init(tfm, sha256_fallback);
}

static void padlock_cra_exit(struct crypto_tfm *tfm)
{
	if (ctx(tfm)->data) {
		free_page((unsigned long)(ctx(tfm)->data));
		ctx(tfm)->data = NULL;
	}

	BUG_ON(!ctx(tfm)->fallback_tfm);
	crypto_free_tfm(ctx(tfm)->fallback_tfm);
	ctx(tfm)->fallback_tfm = NULL;
}

static struct crypto_alg sha1_alg = {
	.cra_name		=	"sha1",
	.cra_driver_name	=	"sha1-padlock",
	.cra_priority		=	PADLOCK_CRA_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_DIGEST,
	.cra_blocksize		=	SHA1_HMAC_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct padlock_sha_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(sha1_alg.cra_list),
	.cra_init		=	padlock_sha1_cra_init,
	.cra_exit		=	padlock_cra_exit,
	.cra_u			=	{
		.digest = {
			.dia_digestsize	=	SHA1_DIGEST_SIZE,
			.dia_init   	= 	padlock_sha_init,
			.dia_update 	=	padlock_sha_update,
			.dia_final  	=	padlock_sha_final,
		}
	}
};

static struct crypto_alg sha256_alg = {
	.cra_name		=	"sha256",
	.cra_driver_name	=	"sha256-padlock",
	.cra_priority		=	PADLOCK_CRA_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_DIGEST,
	.cra_blocksize		=	SHA256_HMAC_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct padlock_sha_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(sha256_alg.cra_list),
	.cra_init		=	padlock_sha256_cra_init,
	.cra_exit		=	padlock_cra_exit,
	.cra_u			=	{
		.digest = {
			.dia_digestsize	=	SHA256_DIGEST_SIZE,
			.dia_init   	= 	padlock_sha_init,
			.dia_update 	=	padlock_sha_update,
			.dia_final  	=	padlock_sha_final,
		}
	}
};

static void __init padlock_sha_check_fallbacks(void)
{
	static struct crypto_tfm *tfm_sha1, *tfm_sha256;

	/* We'll try to allocate one TFM for each fallback
	 * to test that the modules are available. */
	tfm_sha1 = crypto_alloc_tfm(sha1_fallback, 0);
	if (!tfm_sha1) {
		printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
		       sha1_alg.cra_name, sha1_fallback);
	} else {
		printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha1_alg.cra_name,
		       crypto_tfm_alg_driver_name(tfm_sha1), crypto_tfm_alg_priority(tfm_sha1));
		crypto_free_tfm(tfm_sha1);
	}

	tfm_sha256 = crypto_alloc_tfm(sha256_fallback, 0);
	if (!tfm_sha256) {
		printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
		       sha256_alg.cra_name, sha256_fallback);
	} else {
		printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha256_alg.cra_name,
		       crypto_tfm_alg_driver_name(tfm_sha256), crypto_tfm_alg_priority(tfm_sha256));
		crypto_free_tfm(tfm_sha256);
	}
}

static int __init padlock_init(void)
{
	int rc = -ENODEV;

	if (!cpu_has_phe) {
		printk(KERN_ERR PFX "VIA PadLock Hash Engine not detected.\n");
		return -ENODEV;
	}

	if (!cpu_has_phe_enabled) {
		printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
		return -ENODEV;
	}

	padlock_sha_check_fallbacks();

	rc = crypto_register_alg(&sha1_alg);
	if (rc)
		goto out;

	rc = crypto_register_alg(&sha256_alg);
	if (rc)
		goto out_unreg1;

	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");

	return 0;

out_unreg1:
	crypto_unregister_alg(&sha1_alg);
out:
	printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
	return rc;
}

static void __exit padlock_fini(void)
{
	crypto_unregister_alg(&sha1_alg);
	crypto_unregister_alg(&sha256_alg);
}

module_init(padlock_init);
module_exit(padlock_fini);

MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michal Ludvig");

MODULE_ALIAS("sha1-padlock");
MODULE_ALIAS("sha256-padlock");
Commit	Line	Data
6c833275 ML	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
	33	static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
	34	static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;
	35
	36	module_param(sha1_fallback, charp, 0644);
	37	module_param(sha256_fallback, charp, 0644);
	38
	39	MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
	40	SHA1_DEFAULT_FALLBACK);
	41	MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
	42	SHA256_DEFAULT_FALLBACK);
	43
	44	struct 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
	52	static 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
	61	static struct crypto_alg sha1_alg, sha256_alg;
	62
	63	static 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
82	static void padlock_sha_init(struct crypto_tfm *tfm)
83	{
84	ctx(tfm)->used = 0;
85	ctx(tfm)->bypass = 0;
86	}
87
88	static 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
108	static 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
115	void 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
136	void 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
160	static 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
175	static 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
195	static 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
202	static 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
209	static 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
221	static 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
242	static 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
263	static 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
290	static 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
318	out_unreg1:
319	crypto_unregister_alg(&sha1_alg);
320	out:
321	printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
322	return rc;
323	}
324
325	static void __exit padlock_fini(void)
326	{
327	crypto_unregister_alg(&sha1_alg);
328	crypto_unregister_alg(&sha256_alg);
329	}
330
331	module_init(padlock_init);
332	module_exit(padlock_fini);
333
334	MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
335	MODULE_LICENSE("GPL");
336	MODULE_AUTHOR("Michal Ludvig");
337
338	MODULE_ALIAS("sha1-padlock");
339	MODULE_ALIAS("sha256-padlock");